Merge branch 'functions' into builtin-simulation-nodes

This is a vector that does not own the memory its elements are stored in.
Instead, a linear allocator is passed to every call to `append`, that will
be used if the vector has to grow. Since a linear allocator does not support
deallocation, no memory is dealloced until the linear allocator is destructed.

This structure can be used when many small vectors of initially unknown
size are required.

build_files/cmake/Modules/FindLLVM.cmake

@@ -49,6 +49,7 @@ if(NOT LLVM_ROOT_DIR)
           OUTPUT_VARIABLE LLVM_ROOT_DIR
           OUTPUT_STRIP_TRAILING_WHITESPACE)
   set(LLVM_ROOT_DIR ${LLVM_ROOT_DIR} CACHE PATH "Path to the LLVM installation")
+  set(LLVM_INCLUDE_DIRS ${LLVM_ROOT_DIR}/include CACHE PATH "Path to the LLVM include directory")
 endif()
 if(NOT LLVM_LIBPATH)
   execute_process(COMMAND ${LLVM_CONFIG} --libdir

release/datafiles/node_groups/Particle_Age.json

@@ -0,0 +1,207 @@
+{
+ "blender_version": [
+  2,
+  83,
+  10
+ ],
+ "name": "Particle Age",
+ "inputs": [],
+ "outputs": [
+  {
+   "name": "Value",
+   "identifier": "Output_1",
+   "default_value": 0.0,
+   "type": "VALUE",
+   "bl_socket_idname": "NodeSocketFloat"
+  }
+ ],
+ "nodes": [
+  {
+   "name": "Particle Attribute",
+   "bl_idname": "SimulationNodeParticleAttribute",
+   "location": [
+    -398,
+    -1
+   ],
+   "width": 184.53359985351562,
+   "properties": {
+    "data_type": "FLOAT"
+   },
+   "inputs": [
+    {
+     "name": "Name",
+     "identifier": "Name",
+     "default_value": "Birth Time",
+     "type": "STRING"
+    }
+   ],
+   "outputs": [
+    {
+     "name": "Float",
+     "identifier": "Float",
+     "default_value": 0.0,
+     "type": "VALUE"
+    },
+    {
+     "name": "Int",
+     "identifier": "Int",
+     "default_value": 0,
+     "type": "INT"
+    },
+    {
+     "name": "Boolean",
+     "identifier": "Boolean",
+     "default_value": false,
+     "type": "BOOLEAN"
+    },
+    {
+     "name": "Vector",
+     "identifier": "Vector",
+     "default_value": [
+      0.0,
+      0.0,
+      0.0
+     ],
+     "type": "VECTOR"
+    },
+    {
+     "name": "Color",
+     "identifier": "Color",
+     "default_value": [
+      0.0,
+      0.0,
+      0.0,
+      0.0
+     ],
+     "type": "RGBA"
+    },
+    {
+     "name": "Object",
+     "identifier": "Object",
+     "default_value": null,
+     "type": "OBJECT"
+    },
+    {
+     "name": "Image",
+     "identifier": "Image",
+     "default_value": null,
+     "type": "IMAGE"
+    },
+    {
+     "name": "Surface Hook",
+     "identifier": "Surface Hook",
+     "default_value": null,
+     "type": "SURFACE_HOOK"
+    }
+   ]
+  },
+  {
+   "name": "Simulation Time",
+   "bl_idname": "SimulationNodeSimulationTime",
+   "location": [
+    -352,
+    73
+   ],
+   "width": 140.0,
+   "properties": {},
+   "inputs": [],
+   "outputs": [
+    {
+     "name": "Simulation Time",
+     "identifier": "Simulation Time",
+     "default_value": 0.0,
+     "type": "VALUE"
+    }
+   ]
+  },
+  {
+   "name": "Float Math",
+   "bl_idname": "FunctionNodeFloatMath",
+   "location": [
+    -160,
+    120
+   ],
+   "width": 140.0,
+   "properties": {
+    "operation": "SUBTRACT",
+    "use_clamp": false
+   },
+   "inputs": [
+    {
+     "name": "Value",
+     "identifier": "Value",
+     "default_value": 0.5,
+     "type": "VALUE"
+    },
+    {
+     "name": "Value",
+     "identifier": "Value_001",
+     "default_value": 0.5,
+     "type": "VALUE"
+    },
+    {
+     "name": "Value",
+     "identifier": "Value_002",
+     "default_value": 0.0,
+     "type": "VALUE"
+    }
+   ],
+   "outputs": [
+    {
+     "name": "Value",
+     "identifier": "Value",
+     "default_value": 0.0,
+     "type": "VALUE"
+    }
+   ]
+  },
+  {
+   "name": "Group Output",
+   "bl_idname": "NodeGroupOutput",
+   "location": [
+    19,
+    113
+   ],
+   "width": 140.0
+  }
+ ],
+ "links": [
+  {
+   "from": [
+    "Simulation Time",
+    "Simulation Time",
+    0
+   ],
+   "to": [
+    "Float Math",
+    "Value",
+    0
+   ]
+  },
+  {
+   "from": [
+    "Particle Attribute",
+    "Float",
+    0
+   ],
+   "to": [
+    "Float Math",
+    "Value_001",
+    1
+   ]
+  },
+  {
+   "from": [
+    "Float Math",
+    "Value",
+    0
+   ],
+   "to": [
+    "Group Output",
+    "Output_1",
+    0
+   ]
+  }
+ ],
+ "dependencies": []
+}

release/datafiles/node_groups/Particle_Age_Reached_Event.json

@@ -0,0 +1,170 @@
+{
+ "blender_version": [
+  2,
+  83,
+  10
+ ],
+ "name": "Particle Age Reached Event",
+ "inputs": [
+  {
+   "name": "Age",
+   "identifier": "Input_3",
+   "default_value": 0.5,
+   "type": "VALUE",
+   "bl_socket_idname": "NodeSocketFloat"
+  },
+  {
+   "name": "Execute",
+   "identifier": "Input_1",
+   "default_value": null,
+   "type": "CONTROL_FLOW",
+   "bl_socket_idname": "NodeSocketControlFlow"
+  }
+ ],
+ "outputs": [
+  {
+   "name": "Event",
+   "identifier": "Output_5",
+   "default_value": null,
+   "type": "EVENTS",
+   "bl_socket_idname": "NodeSocketEvents"
+  }
+ ],
+ "nodes": [
+  {
+   "name": "Execute Condition",
+   "bl_idname": "SimulationNodeExecuteCondition",
+   "location": [
+    -13,
+    -65
+   ],
+   "width": 140,
+   "properties": {},
+   "inputs": [
+    {
+     "name": "Condition",
+     "identifier": "Condition",
+     "default_value": false,
+     "type": "BOOLEAN"
+    },
+    {
+     "name": "If True",
+     "identifier": "If True",
+     "default_value": null,
+     "type": "CONTROL_FLOW"
+    },
+    {
+     "name": "If False",
+     "identifier": "If False",
+     "default_value": null,
+     "type": "CONTROL_FLOW"
+    }
+   ],
+   "outputs": [
+    {
+     "name": "Execute",
+     "identifier": "Execute",
+     "default_value": null,
+     "type": "CONTROL_FLOW"
+    }
+   ]
+  },
+  {
+   "name": "Group Input",
+   "bl_idname": "NodeGroupInput",
+   "location": [
+    -390,
+    -94
+   ],
+   "width": 140
+  },
+  {
+   "name": "Group",
+   "bl_idname": "SimulationNodeGroup",
+   "location": [
+    -384,
+    16
+   ],
+   "width": 140,
+   "group_name": "Particle Age"
+  },
+  {
+   "name": "Particle Time Step Event",
+   "bl_idname": "SimulationNodeParticleTimeStepEvent",
+   "location": [
+    168,
+    -60
+   ],
+   "width": 140,
+   "properties": {
+    "mode": "BEGIN"
+   },
+   "inputs": [
+    {
+     "name": "Execute",
+     "identifier": "Execute",
+     "default_value": null,
+     "type": "CONTROL_FLOW"
+    }
+   ],
+   "outputs": [
+    {
+     "name": "Event",
+     "identifier": "Event",
+     "default_value": null,
+     "type": "EVENTS"
+    }
+   ]
+  },
+  {
+   "name": "Group Output",
+   "bl_idname": "NodeGroupOutput",
+   "location": [
+    354,
+    -64
+   ],
+   "width": 140
+  }
+ ],
+ "links": [
+  {
+   "from": [
+    "Particle Time Step Event",
+    "Event",
+    0
+   ],
+   "to": [
+    "Group Output",
+    "Output_5",
+    0
+   ]
+  },
+  {
+   "from": [
+    "Group Input",
+    "Input_1",
+    1
+   ],
+   "to": [
+    "Execute Condition",
+    "If True",
+    1
+   ]
+  },
+  {
+   "from": [
+    "Execute Condition",
+    "Execute",
+    0
+   ],
+   "to": [
+    "Particle Time Step Event",
+    "Execute",
+    0
+   ]
+  }
+ ],
+ "dependencies": [
+  "Particle Age"
+ ]
+}

release/scripts/modules/builtin_node_groups.py

@@ -0,0 +1,305 @@
+import os
+import bpy
+import json
+from functools import lru_cache
+
+
+def get_socket_value(sock):
+    if sock.type in {"VALUE", "INT", "BOOLEAN", "STRING"}:
+        return sock.default_value
+    elif sock.type in {"VECTOR", "RGBA"}:
+        return tuple(sock.default_value)
+    else:
+        return None
+
+def insert_socket_data(sock_data, sock):
+    sock_data["name"] = sock.name
+    sock_data["identifier"] = sock.identifier
+    sock_data["default_value"] = get_socket_value(sock)
+    sock_data["type"] = sock.type
+
+def insert_group_interface(json_data, group):
+    for sock in group.inputs:
+        sock_data = {}
+        insert_socket_data(sock_data, sock)
+        sock_data["bl_socket_idname"] = sock.bl_socket_idname
+        json_data["inputs"].append(sock_data)
+
+    for sock in group.outputs:
+        sock_data = {}
+        insert_socket_data(sock_data, sock)
+        sock_data["bl_socket_idname"] = sock.bl_socket_idname
+        json_data["outputs"].append(sock_data)
+
+def insert_node_data(node_data, node):
+    node_data["name"] = node.name
+    node_data["bl_idname"] = node.bl_idname
+    node_data["location"] = tuple(map(int, node.location))
+    node_data["width"] = int(node.width)
+
+    # Don't compute this only once in the beginning, because addons might register more properties.
+    base_node_property_names = {prop.identifier for prop in bpy.types.Node.bl_rna.properties}
+
+    if node.bl_idname in {"NodeGroupInput", "NodeGroupOutput"}:
+        pass
+    elif node.bl_idname == "SimulationNodeGroup":
+        node_data["group_name"] = getattr(node.node_tree, "name", None)
+    else:
+        node_data["properties"] = {}
+        for prop in node.bl_rna.properties:
+            if prop.identifier not in base_node_property_names:
+                node_data["properties"][prop.identifier] = getattr(node, prop.identifier)
+
+        node_data["inputs"] = []
+        node_data["outputs"] = []
+        for sock in node.inputs:
+            sock_data = {}
+            insert_socket_data(sock_data, sock)
+            node_data["inputs"].append(sock_data)
+        for sock in node.outputs:
+            sock_data = {}
+            insert_socket_data(sock_data, sock)
+            node_data["outputs"].append(sock_data)
+
+def insert_nodes_data(json_data, group):
+    for node in group.nodes:
+        node_data = {}
+        insert_node_data(node_data, node)
+        json_data["nodes"].append(node_data)
+
+def insert_links_data(json_data, group):
+    for link in group.links:
+        link_data = {}
+        link_data["from"] = [link.from_node.name, link.from_socket.identifier, list(link.from_node.outputs).index(link.from_socket)]
+        link_data["to"] = [link.to_node.name, link.to_socket.identifier, list(link.to_node.inputs).index(link.to_socket)]
+        json_data["links"].append(link_data)
+
+def find_direct_dependency_groups(group):
+    dependencies = set()
+    for node in group.nodes:
+        if node.bl_idname == "SimulationNodeGroup":
+            if node.node_tree is not None:
+                dependencies.add(node.node_tree)
+    return dependencies
+
+def insert_dependencies(json_data, group):
+    dependency_names = [dependency.name for dependency in find_direct_dependency_groups(group)]
+    json_data["dependencies"] = dependency_names
+
+def node_group_to_json_data(group):
+    json_data = {}
+    json_data["blender_version"] = bpy.app.version
+    json_data["name"] = group.name
+    json_data["inputs"] = []
+    json_data["outputs"] = []
+    json_data["nodes"] = []
+    json_data["links"] = []
+
+    insert_group_interface(json_data, group)
+    insert_nodes_data(json_data, group)
+    insert_links_data(json_data, group)
+    insert_dependencies(json_data, group)
+
+    return json_data
+
+def save_group_as_json(group, file_path):
+    json_data = node_group_to_json_data(group)
+    json_str = json.dumps(json_data, indent=1)
+    os.makedirs(os.path.dirname(file_path), exist_ok=True)
+    with open(file_path, "w") as f:
+        f.write(json_str)
+
+
+builtin_node_group_directory = os.path.join(bpy.utils.resource_path("LOCAL"), "datafiles", "node_groups")
+
+def group_name_to_file_name(group_name):
+    return group_name.replace(" ", "_") + ".json"
+
+def file_name_to_group_name(file_name):
+    return file_name.replace("_", " ")[:-len(".json")]
+
+def group_name_to_file_path(group_name):
+    file_name = group_name_to_file_name(group_name)
+    return os.path.join(builtin_node_group_directory, file_name)
+
+def property_has_given_value(owner, prop_name, value):
+    prop = owner.bl_rna.properties[prop_name]
+    if prop.type in {'BOOLEAN', 'INT', 'STRING', 'ENUM'}:
+        return getattr(owner, prop_name) == value
+    elif prop.type == 'FLOAT':
+        if prop.array_length <= 1:
+            return getattr(owner, prop_name) == value
+        else:
+            return tuple(getattr(owner, prop_name)) == tuple(value)
+    else:
+        assert False
+
+def group_matches_json_data(group, json_data, loaded_group_by_name):
+    groups_json_data = get_builtin_groups_data()
+
+    if len(group.nodes) != len(json_data["nodes"]):
+        return False
+    if len(group.links) != len(json_data["links"]):
+        return False
+    if len(group.inputs) != len(json_data["inputs"]):
+        return False
+    if len(group.outputs) != len(json_data["outputs"]):
+        return False
+
+    for node_data in json_data["nodes"]:
+        node = group.nodes.get(node_data["name"])
+        if node is None:
+            return False
+        if node.bl_idname != node_data["bl_idname"]:
+            return False
+
+        if node.bl_idname in {"NodeGroupInput", "NodeGroupOutput"}:
+            pass
+        elif node.bl_idname == "SimulationNodeGroup":
+            if node.node_tree is None:
+                return False
+            elif node.node_tree == loaded_group_by_name[node_data["group_name"]]:
+                pass
+            elif not group_matches_json_data(node.node_tree,
+                                             groups_json_data[node_data["group_name"]],
+                                             loaded_group_by_name):
+                return False
+
+        else:
+            for key, value in node_data["properties"].items():
+                if getattr(node, key) != value:
+                    return False
+            if len(node.inputs) != len(node_data["inputs"]):
+                return False
+            if len(node.outputs) != len(node_data["outputs"]):
+                return False
+            for sock_data, sock in zip(node_data["inputs"], node.inputs):
+                if hasattr(sock, "default_value"):
+                    if not property_has_given_value(sock, "default_value", sock_data["default_value"]):
+                        return False
+
+    for sock_data, sock in zip(json_data["inputs"], group.inputs):
+        if sock_data["bl_socket_idname"] != sock.bl_socket_idname:
+            return False
+        if sock_data["name"] != sock.name:
+            return False
+
+    for sock_data, sock in zip(json_data["outputs"], group.outputs):
+        if sock_data["bl_socket_idname"] != sock.bl_socket_idname:
+            return False
+        if sock_data["name"] != sock.name:
+            return False
+
+    link_cache = set()
+    for link in group.links:
+        link_cache.add((
+            link.from_node.name, list(link.from_node.outputs).index(link.from_socket),
+            link.to_node.name, list(link.to_node.inputs).index(link.to_socket)))
+    for link_data in json_data["links"]:
+        if (link_data["from"][0], link_data["from"][2], link_data["to"][0], link_data["to"][2]) not in link_cache:
+            return False
+
+    return True
+
+def get_or_create_node_group(json_data, loaded_group_by_name):
+    for potential_group in bpy.data.node_groups:
+        if group_matches_json_data(potential_group, json_data, loaded_group_by_name):
+            return potential_group
+
+    group = bpy.data.node_groups.new(json_data["name"], "SimulationNodeTree")
+
+    for node_data in json_data["nodes"]:
+        node = group.nodes.new(node_data["bl_idname"])
+        node.name = node_data["name"]
+        node.location = node_data["location"]
+        node.select = False
+        node.width = node_data["width"]
+
+        if node.bl_idname in {"NodeGroupInput", "NodeGroupOutput"}:
+            pass
+        elif node.bl_idname == "SimulationNodeGroup":
+            node.node_tree = loaded_group_by_name[node_data["group_name"]]
+        else:
+            for key, value in node_data["properties"].items():
+                setattr(node, key, value)
+
+            for sock_data, sock in zip(node_data["inputs"], node.inputs):
+                if hasattr(sock, "default_value"):
+                    sock.default_value = sock_data["default_value"]
+
+    for sock_data in json_data["inputs"]:
+        group.inputs.new(sock_data["bl_socket_idname"], sock_data["name"])
+
+    for sock_data in json_data["outputs"]:
+        group.outputs.new(sock_data["bl_socket_idname"], sock_data["name"])
+
+    for link_data in json_data["links"]:
+        from_socket = group.nodes[link_data["from"][0]].outputs[link_data["from"][2]]
+        to_socket = group.nodes[link_data["to"][0]].inputs[link_data["to"][2]]
+        group.links.new(from_socket, to_socket)
+
+    return group
+
+def export_builtin_node_group(group):
+    file_path = group_name_to_file_path(group.name)
+    save_group_as_json(group, file_path)
+
+@lru_cache()
+def get_builtin_groups_data():
+    json_data_by_group_name = dict()
+
+    if not os.path.exists(builtin_node_group_directory):
+        return json_data_by_group_name
+
+    for file_name in os.listdir(builtin_node_group_directory):
+        if not file_name.endswith(".json"):
+            continue
+        file_path = os.path.join(builtin_node_group_directory, file_name)
+        with open(file_path, "r") as f:
+            json_str = f.read()
+        json_data = json.loads(json_str)
+        group_name = json_data["name"]
+        json_data_by_group_name[group_name] = json_data
+
+    return json_data_by_group_name
+
+def get_sorted_group_names_to_load(main_group_name):
+    groups_json_data = get_builtin_groups_data()
+
+    sorted_group_names = []
+
+    def add_group(group_name):
+        if group_name in sorted_group_names:
+            return
+        json_data = groups_json_data[group_name]
+        for dependency_name in json_data["dependencies"]:
+            add_group(dependency_name)
+        sorted_group_names.append(group_name)
+
+    add_group(main_group_name)
+    return sorted_group_names
+
+def get_builtin_group_items_cb(node_tree_idname):
+    def items_generator(self, context):
+        items = []
+        for i, name in enumerate(get_builtin_groups_data().keys()):
+            items.append((str(i), name, ""))
+        return items
+    return items_generator
+
+def import_builtin_node_group_with_dependencies(group_name):
+    sorted_group_names = get_sorted_group_names_to_load(group_name)
+    groups_json_data = get_builtin_groups_data()
+    loaded_group_by_name = dict()
+
+    for group_name in sorted_group_names:
+        json_data = groups_json_data[group_name]
+        group = get_or_create_node_group(json_data, loaded_group_by_name)
+        loaded_group_by_name[group_name] = group
+
+    return loaded_group_by_name[group_name]
+
+def import_builtin_node_group_by_item_identifier(item_identifier):
+    index = int(item_identifier)
+    group_name = list(get_builtin_groups_data().keys())[index]
+    return import_builtin_node_group_with_dependencies(group_name)

release/scripts/startup/bl_operators/__init__.py

@@ -33,6 +33,7 @@ _modules = [
     "file",
     "image",
     "mesh",
+    "modifiers",
     "node",
     "object",
     "object_align",

release/scripts/startup/bl_operators/modifiers.py

@@ -0,0 +1,91 @@
+import bpy
+from bpy.props import (
+    StringProperty,
+)
+
+class ModifierOperator:
+    object_name: StringProperty()
+    modifier_name: StringProperty()
+
+    def get_modifier(self):
+        ob = bpy.data.objects.get(self.object_name)
+        if ob is None:
+            return None
+        return ob.modifiers.get(self.modifier_name)
+
+class NewDeformationFunction(bpy.types.Operator, ModifierOperator):
+    bl_idname = "fn.new_deformation_function"
+    bl_label = "New Deformation Function"
+
+    def execute(self, context):
+        mod = self.get_modifier()
+        if mod is None:
+            return {'CANCELLED'}
+
+        from nodes.node_operators import new_function_tree
+        tree = new_function_tree("Deformation Function", [
+            ("Vector", "Old Position"),
+            ("Float", "Control 1"),
+            ("Integer", "Control 2")
+        ], [
+            ("Vector", "New Position"),
+        ])
+
+        tree.new_link(
+            tree.get_input_nodes()[0].outputs[0],
+            tree.get_output_nodes()[0].inputs[0])
+
+        mod.function_tree = tree
+        return {'FINISHED'}
+
+class NewPointGeneratorFunction(bpy.types.Operator, ModifierOperator):
+    bl_idname = "fn.new_point_generator_function"
+    bl_label = "New Point Generator Function"
+
+    def execute(self, context):
+        mod = self.get_modifier()
+        if mod is None:
+            return {'CANCELLED'}
+
+        from nodes.node_operators import new_function_tree
+        tree = new_function_tree("Point Generator", [
+            ("Float", "Control 1"),
+            ("Integer", "Control 2"),
+        ], [
+            ("Vector List", "Points"),
+        ])
+
+        mod.function_tree = tree
+        return {'FINISHED'}
+
+class NewParticleSimulationTree(bpy.types.Operator, ModifierOperator):
+    bl_idname = "fn.new_particle_simulation_tree"
+    bl_label = "New Particle Simulation Tree"
+
+    def execute(self, context):
+        mod = self.get_modifier()
+        if mod is None:
+            return {'CANCELLED'}
+
+        tree = bpy.data.node_groups.new("Particle Simulation", "FunctionTree")
+
+        type_node = tree.nodes.new("fn_ParticleSystemNode")
+
+        emitter_node = tree.nodes.new("fn_InitialGridEmitterNode")
+        emitter_node.location = (-250, 200)
+
+        gravity_node = tree.nodes.new("fn_ForceNode")
+        gravity_node.inputs[0].value = (0, 0, -1)
+        gravity_node.location = (-250, -100)
+
+        tree.links.new(emitter_node.outputs[0], type_node.inputs[0])
+        tree.links.new(gravity_node.outputs[0], type_node.inputs[0])
+
+        mod.node_tree = tree
+        return {'FINISHED'}
+
+classes = (
+    NewDeformationFunction,
+    NewPointGeneratorFunction,
+    NewParticleSimulationTree,
+)

release/scripts/startup/bl_operators/node.py

@@ -18,7 +18,9 @@
 
 # <pep8-80 compliant>
 
+import os
 import bpy
+import json
 import nodeitems_utils
 from bpy.types import (
     Operator,
@@ -31,7 +33,12 @@ from bpy.props import (
     IntProperty,
     StringProperty,
 )
-
+from builtin_node_groups import (
+    export_builtin_node_group,
+    get_builtin_group_items_cb,
+    import_builtin_node_group_by_item_identifier,
+    import_builtin_node_group_with_dependencies,
+)
 
 class NodeSetting(PropertyGroup):
     value: StringProperty(
@@ -295,6 +302,60 @@ class NODE_OT_tree_path_parent(Operator):
         return {'FINISHED'}
 
 
+
+
+class NODE_OT_export_group_template(Operator):
+    bl_idname = "node.export_group_template"
+    bl_label = "Export Node Group Template"
+
+    @classmethod
+    def poll(cls, context):
+        space = context.space_data
+        return space.type == 'NODE_EDITOR' and getattr(space.edit_tree, "bl_idname", "") == "SimulationNodeTree"
+
+    def execute(self, context):
+        group = context.space_data.edit_tree
+        export_builtin_node_group(group)
+        return {'FINISHED'}
+
+class NODE_OT_import_group_template_search(bpy.types.Operator):
+    bl_idname = "node.import_group_template_search"
+    bl_label = "Import Node Group Template Search"
+    bl_property = "item"
+
+    item: EnumProperty(items=get_builtin_group_items_cb("SimulationNodeTree"))
+
+    def invoke(self, context, event):
+        context.window_manager.invoke_search_popup(self)
+        return {'CANCELLED'}
+
+    def execute(self, context):
+        if self.item == "NONE":
+            return {'CANCELLED'}
+        else:
+            import_builtin_node_group_by_item_identifier(self.item)
+            return {'FINISHED'}
+
+class NODE_OT_add_builtin_node_group(bpy.types.Operator):
+    bl_idname = "node.add_builtin_node_group"
+    bl_label = "Add Builtin Node Group"
+
+    group_name: StringProperty()
+
+    def invoke(self, context, event):
+        node_tree = context.space_data.edit_tree
+        for node in node_tree.nodes:
+            node.select = False
+
+        group = import_builtin_node_group_with_dependencies(self.group_name)
+        group_node = node_tree.nodes.new("SimulationNodeGroup")
+        group_node.node_tree = group
+        group_node.select = True
+        node_tree.nodes.active = group_node
+
+        bpy.ops.node.translate_attach_remove_on_cancel('INVOKE_DEFAULT')
+        return {'FINISHED'}
+
 classes = (
     NodeSetting,
 
@@ -303,4 +364,7 @@ classes = (
     NODE_OT_add_search,
     NODE_OT_collapse_hide_unused_toggle,
     NODE_OT_tree_path_parent,
+    NODE_OT_export_group_template,
+    NODE_OT_import_group_template_search,
+    NODE_OT_add_builtin_node_group,
 )

release/scripts/startup/bl_ui/properties_data_modifier.py

@@ -406,7 +406,7 @@ class DATA_PT_modifiers(ModifierButtonsPanel, Panel):
         row.prop(md, "mid_level")
         row.prop(md, "strength")
 
-    def DYNAMIC_PAINT(self, layout, _ob, _md):
+    def DYNAMIC_PAINT(self, layout, _ob, md):
         layout.label(text="Settings are inside the Physics tab")
 
     def EDGE_SPLIT(self, layout, _ob, md):
@@ -1788,6 +1788,42 @@ class DATA_PT_modifiers(ModifierButtonsPanel, Panel):
         col.prop(md, "thresh", text="Threshold")
         col.prop(md, "face_influence")
 
+    def FUNCTION_DEFORM(self, layout, ob, md):
+        layout.prop(md, "control1")
+        layout.prop(md, "control2")
+
+        row = layout.row(align=True)
+        row.prop(md, "function_tree")
+        props = row.operator("fn.new_deformation_function", text="", icon="ADD")
+        props.object_name = ob.name
+        props.modifier_name = md.name
+
+    def FUNCTION_POINTS(self, layout, ob, md):
+        layout.prop(md, "control1")
+        layout.prop(md, "control2")
+
+        row = layout.row(align=True)
+        row.prop(md, "function_tree")
+        props = row.operator("fn.new_point_generator_function", text="", icon="ADD")
+        props.object_name = ob.name
+        props.modifier_name = md.name
+
+    def BPARTICLES(self, layout, ob, md):
+        row = layout.row(align=True)
+        row.prop(md, "node_tree")
+        props = row.operator("fn.new_particle_simulation_tree", text="", icon="ADD")
+        props.object_name = ob.name
+        props.modifier_name = md.name
+
+        layout.operator("object.bparticles_clear_cache", text="Clear Cache")
+
+        layout.prop(md, "output_type")
+
+    def BPARTICLES_OUTPUT(self, layout, ob, md):
+        layout.prop(md, "source_object")
+        layout.prop(md, "source_particle_system", icon="PHYSICS")
+        layout.prop(md, "output_type")
+
 
 class DATA_PT_gpencil_modifiers(ModifierButtonsPanel, Panel):
     bl_label = "Modifiers"

release/scripts/startup/bl_ui/space_node.py

@@ -207,6 +207,11 @@ class NODE_MT_add(bpy.types.Menu):
     def draw(self, context):
         layout = self.layout
 
+        from nodes.base import BaseTree
+        tree = context.space_data.node_tree
+        if isinstance(tree, BaseTree):
+            return
+
         layout.operator_context = 'INVOKE_DEFAULT'
         props = layout.operator("node.add_search", text="Search...", icon='VIEWZOOM')
         props.use_transform = True

release/scripts/startup/bl_ui/space_userpref.py

@@ -1229,6 +1229,7 @@ class USERPREF_PT_file_paths_data(FilePathsPanel, Panel):
         col.prop(paths, "script_directory", text="Scripts")
         col.prop(paths, "sound_directory", text="Sounds")
         col.prop(paths, "temporary_directory", text="Temporary Files")
+        col.prop(paths, "nodelib_directory", text="Nodelib Files")
 
 
 class USERPREF_PT_file_paths_render(FilePathsPanel, Panel):

release/scripts/startup/bl_ui/space_view3d.py

@@ -2194,6 +2194,10 @@ class VIEW3D_MT_add(Menu):
 
         layout.separator()
 
+        layout.operator("fn.new_particle_system", text="Particle Simulation", icon='MOD_PARTICLES')
+
+        layout.separator()
+
         if VIEW3D_MT_camera_add.is_extended():
             layout.menu("VIEW3D_MT_camera_add", icon='OUTLINER_OB_CAMERA')
         else:

release/scripts/startup/nodeitems_builtins.py

@@ -24,6 +24,9 @@ from nodeitems_utils import (
     NodeItem,
     NodeItemCustom,
 )
+from builtin_node_groups import (
+    get_builtin_groups_data,
+)
 
 
 # Subclasses for standard node types
@@ -57,6 +60,18 @@ class TextureNodeCategory(SortedNodeCategory):
         return (context.space_data.type == 'NODE_EDITOR' and
                 context.space_data.tree_type == 'TextureNodeTree')
 
+class SimulationNodeCategory(SortedNodeCategory):
+    @classmethod
+    def poll(cls, context):
+        return (context.space_data.type == 'NODE_EDITOR' and
+                context.space_data.tree_type == 'SimulationNodeTree')
+
+class FunctionNodeCategory(SortedNodeCategory):
+    @classmethod
+    def poll(cls, context):
+        return (context.space_data.type == 'NODE_EDITOR' and
+                context.space_data.tree_type == 'SimulationNodeTree')
+
 
 # menu entry for node group tools
 def group_tools_draw(self, layout, context):
@@ -70,6 +85,7 @@ node_tree_group_type = {
     'CompositorNodeTree': 'CompositorNodeGroup',
     'ShaderNodeTree': 'ShaderNodeGroup',
     'TextureNodeTree': 'TextureNodeGroup',
+    'SimulationNodeTree' : 'SimulationNodeGroup',
 }
 
 
@@ -109,6 +125,14 @@ def node_group_items(context):
                        group.name,
                        {"node_tree": "bpy.data.node_groups[%r]" % group.name})
 
+    def draw_builtin_node_groups(self, layout, context):
+        layout.separator()
+        groups_json_data = get_builtin_groups_data()
+        for group_name in groups_json_data.keys():
+            props = layout.operator("node.add_builtin_node_group", text=group_name)
+            props.group_name = group_name
+
+    yield NodeItemCustom(draw=draw_builtin_node_groups)
 
 # only show input/output nodes inside node groups
 def group_input_output_item_poll(context):
@@ -467,17 +491,87 @@ texture_node_categories = [
     ]),
 ]
 
+simulation_node_categories = [
+    SimulationNodeCategory("SIM_OUTPUT", "Output", items=[
+        NodeItem("SimulationNodeParticleSimulation"),
+    ]),
+    SimulationNodeCategory("EMITTERS", "Emitters", items=[
+        NodeItem("SimulationNodeParticleMeshEmitter"),
+        NodeItem("SimulationNodeEmitParticles"),
+    ]),
+    SimulationNodeCategory("EVENTS", "Events", items=[
+        NodeItem("SimulationNodeParticleBirthEvent"),
+        NodeItem("SimulationNodeParticleTimeStepEvent"),
+        NodeItem("SimulationNodeParticleMeshCollisionEvent"),
+    ]),
+    SimulationNodeCategory("FORCES", "Forces", items=[
+        NodeItem("SimulationNodeForce"),
+    ]),
+    SimulationNodeCategory("EXECUTE", "Execute", items=[
+        NodeItem("SimulationNodeSetParticleAttribute"),
+        NodeItem("SimulationNodeExecuteCondition"),
+        NodeItem("SimulationNodeMultiExecute"),
+    ]),
+    SimulationNodeCategory("FUNCTION_INPUTS", "Function Inputs", items=[
+        NodeItem("SimulationNodeSimulationTime"),
+        NodeItem("SimulationNodeParticleAttribute"),
+    ]),
+    FunctionNodeCategory("CONVERTER", "Converter", items=[
+        NodeItem("FunctionNodeCombineXYZ"),
+        NodeItem("FunctionNodeSeparateXYZ"),
+        NodeItem("FunctionNodeCombineRGB"),
+        NodeItem("FunctionNodeSeparateRGB"),
+        NodeItem("FunctionNodeCombineHSV"),
+        NodeItem("FunctionNodeSeparateHSV"),
+        NodeItem("FunctionNodeFloatMath"),
+        NodeItem("FunctionNodeVectorMath"),
+        NodeItem("FunctionNodeBooleanMath"),
+        NodeItem("FunctionNodeFloatCompare"),
+        NodeItem("FunctionNodeInstanceIdentifier"),
+        NodeItem("FunctionNodeStringConcatenation"),
+        NodeItem("FunctionNodeObjectTransforms"),
+        NodeItem("FunctionNodeSwitch"),
+    ]),
+    FunctionNodeCategory("SURFACE", "Surface", items=[
+        NodeItem("FunctionNodeClosestSurface"),
+        NodeItem("FunctionNodeSurfaceColor"),
+        NodeItem("FunctionNodeSurfaceNormal"),
+        NodeItem("FunctionNodeSurfacePosition"),
+        NodeItem("FunctionNodeSurfaceWeight"),
+    ]),
+    FunctionNodeCategory("NOISE", "Noise", items=[
+        NodeItem("ShaderNodeTexWhiteNoise"),
+        NodeItem("ShaderNodeTexGradient"),
+        NodeItem("ShaderNodeTexNoise"),
+        NodeItem("ShaderNodeTexMagic"),
+        NodeItem("ShaderNodeTexWave"),
+        NodeItem("ShaderNodeTexMusgrave"),
+        NodeItem("ShaderNodeTexVoronoi"),
+        NodeItem("ShaderNodeTexChecker"),
+        NodeItem("ShaderNodeTexBrick"),
+    ]),
+    SimulationNodeCategory("GROUPS", "Groups", items=node_group_items),
+    SimulationNodeCategory("LAYOUT", "Layout", items=[
+        NodeItem("NodeFrame"),
+        NodeItem("NodeReroute"),
+        NodeItem("NodeGroupInput", poll=group_input_output_item_poll),
+        NodeItem("NodeGroupOutput", poll=group_input_output_item_poll),
+    ]),
+]
+
 
 def register():
     nodeitems_utils.register_node_categories('SHADER', shader_node_categories)
     nodeitems_utils.register_node_categories('COMPOSITING', compositor_node_categories)
     nodeitems_utils.register_node_categories('TEXTURE', texture_node_categories)
+    nodeitems_utils.register_node_categories('SIMULATION', simulation_node_categories)
 
 
 def unregister():
     nodeitems_utils.unregister_node_categories('SHADER')
     nodeitems_utils.unregister_node_categories('COMPOSITING')
     nodeitems_utils.unregister_node_categories('TEXTURE')
+    nodeitems_utils.unregister_node_categories('SIMULATION')
 
 
 if __name__ == "__main__":

release/scripts/startup/nodes/__init__.py

@@ -0,0 +1,3 @@
+from . auto_load import init, register, unregister
+
+init()

release/scripts/startup/nodes/auto_load.py

@@ -0,0 +1,138 @@
+import os
+import bpy
+import sys
+import typing
+import inspect
+import pkgutil
+import importlib
+from pathlib import Path
+
+__all__ = (
+    "init",
+    "register",
+    "unregister",
+)
+
+modules = None
+ordered_classes = None
+
+def init():
+    global modules
+    global ordered_classes
+
+    modules = get_all_submodules(Path(__file__).parent)
+    ordered_classes = get_ordered_classes_to_register(modules)
+
+def register():
+    for cls in ordered_classes:
+        bpy.utils.register_class(cls)
+
+    for module in modules:
+        if module.__name__ == __name__:
+            continue
+        if hasattr(module, "register"):
+            module.register()
+
+def unregister():
+    for cls in reversed(ordered_classes):
+        bpy.utils.unregister_class(cls)
+
+    for module in modules:
+        if module.__name__ == __name__:
+            continue
+        if hasattr(module, "unregister"):
+            module.unregister()
+
+
+# Import modules
+#################################################
+
+def get_all_submodules(directory):
+    return list(iter_submodules(directory, directory.name))
+
+def iter_submodules(path, package_name):
+    for name in sorted(iter_submodule_names(path)):
+        yield importlib.import_module("." + name, package_name)
+
+def iter_submodule_names(path, root=""):
+    for _, module_name, is_package in pkgutil.iter_modules([str(path)]):
+        if is_package:
+            sub_path = path / module_name
+            sub_root = root + module_name + "."
+            yield from iter_submodule_names(sub_path, sub_root)
+        else:
+            yield root + module_name
+
+
+# Find classes to register
+#################################################
+
+def get_ordered_classes_to_register(modules):
+    return toposort(get_register_deps_dict(modules))
+
+def get_register_deps_dict(modules):
+    deps_dict = {}
+    classes_to_register = set(iter_classes_to_register(modules))
+    for cls in classes_to_register:
+        deps_dict[cls] = set(iter_own_register_deps(cls, classes_to_register))
+    return deps_dict
+
+def iter_own_register_deps(cls, own_classes):
+    yield from (dep for dep in iter_register_deps(cls) if dep in own_classes)
+
+def iter_register_deps(cls):
+    for value in typing.get_type_hints(cls, {}, {}).values():
+        dependency = get_dependency_from_annotation(value)
+        if dependency is not None:
+            yield dependency
+
+def get_dependency_from_annotation(value):
+    if isinstance(value, tuple) and len(value) == 2:
+        if value[0] in (bpy.props.PointerProperty, bpy.props.CollectionProperty):
+            return value[1]["type"]
+    return None
+
+def iter_classes_to_register(modules):
+    base_types = get_register_base_types()
+    for cls in get_classes_in_modules(modules):
+        if any(base in base_types for base in cls.__bases__):
+            if not getattr(cls, "is_registered", False):
+                yield cls
+
+def get_classes_in_modules(modules):
+    classes = set()
+    for module in modules:
+        for cls in iter_classes_in_module(module):
+            classes.add(cls)
+    return classes
+
+def iter_classes_in_module(module):
+    for value in module.__dict__.values():
+        if inspect.isclass(value):
+            yield value
+
+def get_register_base_types():
+    return set(getattr(bpy.types, name) for name in [
+        "Panel", "Operator", "PropertyGroup",
+        "AddonPreferences", "Header", "Menu",
+        "Node", "NodeSocket", "NodeTree",
+        "UIList", "RenderEngine"
+    ])
+
+
+# Find order to register to solve dependencies
+#################################################
+
+def toposort(deps_dict):
+    sorted_list = []
+    sorted_values = set()
+    while len(deps_dict) > 0:
+        unsorted = []
+        for value, deps in deps_dict.items():
+            if len(deps) == 0:
+                sorted_list.append(value)
+                sorted_values.add(value)
+            else:
+                unsorted.append(value)
+        deps_dict = {value : deps_dict[value] - sorted_values for value in unsorted}
+    return sorted_list

release/scripts/startup/nodes/base.py

@@ -0,0 +1,303 @@
+import bpy
+from bpy.props import *
+from . utils.generic import iter_subclasses_recursive
+import itertools
+from collections import defaultdict
+
+class BaseTree:
+    def new_link(self, a, b):
+        if a.is_output:
+            self.links.new(a, b)
+        else:
+            self.links.new(b, a)
+
+    def update(self):
+        self.sync()
+
+    def sync(self):
+        from . sync import sync_trees_and_dependent_trees
+        sync_trees_and_dependent_trees({self})
+
+
+class SocketValueStates:
+    def __init__(self, node):
+        self.node = node
+        self.input_value_storage = dict()
+
+    def store_current(self):
+        for socket in self.node.inputs:
+            if not isinstance(socket, DataSocket):
+                continue
+            storage_id = (socket.data_type, socket.identifier)
+            self.input_value_storage[storage_id] = socket.get_state()
+
+    def try_load(self):
+        for socket in self.node.inputs:
+            if not isinstance(socket, DataSocket):
+                continue
+            storage_id = (socket.data_type, socket.identifier)
+            if storage_id in self.input_value_storage:
+                socket.restore_state(self.input_value_storage[storage_id])
+
+
+def get_new_node_identifier():
+    import uuid
+    return str(uuid.uuid4())
+
+
+class BaseNode:
+    search_terms = tuple()
+    search_terms_only = False
+
+    identifier: StringProperty()
+
+    def init(self, context):
+        self.identifier = get_new_node_identifier()
+
+        from . sync import skip_syncing
+        with skip_syncing():
+            self.init_props()
+            builder = self.get_node_builder()
+            builder.initialize_decls()
+            builder.build()
+
+    def init_props(self):
+        pass
+
+    @classmethod
+    def get_search_terms(cls):
+        if not cls.search_terms_only:
+            yield (cls.bl_label, dict())
+        yield from cls.search_terms
+
+    def sync_tree(self, context=None):
+        self.tree.sync()
+
+    def rebuild(self):
+        from . sync import skip_syncing
+        with skip_syncing():
+            self.socket_value_states.store_current()
+            linkage_state = LinkageState(self)
+
+            self.rebuild_fast()
+
+            self.socket_value_states.try_load()
+            linkage_state.try_restore()
+
+    def rebuild_fast(self):
+        from . sync import skip_syncing
+        with skip_syncing():
+            builder = self.get_node_builder()
+            builder.build()
+            _decl_map_per_node[self] = builder.get_sockets_decl_map()
+
+    @property
+    def tree(self):
+        return self.id_data
+
+    def get_node_builder(self):
+        from . node_builder import NodeBuilder
+        builder = NodeBuilder(self)
+        self.declaration(builder)
+        return builder
+
+    def declaration(self, builder):
+        raise NotImplementedError()
+
+    def draw_buttons(self, context, layout):
+        self.draw(layout)
+        for decl in self.decl_map.iter_decls():
+            decl.draw_node(layout)
+
+    def draw_buttons_ext(self, context, layout):
+        self.draw_advanced(layout)
+
+    def draw(self, layout):
+        pass
+
+    def draw_advanced(self, layout):
+        pass
+
+    def draw_socket(self, layout, socket, text, decl, index_in_decl):
+        decl.draw_socket(layout, socket, index_in_decl)
+
+    def draw_label(self):
+        if self.hide:
+            return self.draw_closed_label()
+        else:
+            return self.bl_label
+
+    def draw_closed_label(self):
+        return self.bl_label
+
+    def iter_directly_used_trees(self):
+        return
+        yield
+
+    def invoke_function(self,
+            layout, function_name, text,
+            *, icon="NONE", settings=tuple()):
+        assert isinstance(settings, tuple)
+        props = layout.operator("fn.node_operator", text=text, icon=icon)
+        self._set_common_invoke_props(props, function_name, settings)
+
+    def invoke_type_selection(self,
+            layout, function_name, text,
+            *, mode="ALL", icon="NONE", settings=tuple()):
+        assert isinstance(settings, tuple)
+        props = layout.operator("fn.node_data_type_selector", text=text, icon=icon)
+        self._set_common_invoke_props(props, function_name, settings)
+        props.mode = mode
+
+    def invoke_group_selector(self,
+            layout, function_name, text,
+            *, icon="NONE", settings=tuple()):
+        assert isinstance(settings, tuple)
+        props = layout.operator("fn.node_group_selector", text=text, icon=icon)
+        self._set_common_invoke_props(props, function_name, settings)
+
+    def _set_common_invoke_props(self, props, function_name, settings):
+        props.tree_name = self.id_data.name
+        props.node_name = self.name
+        props.function_name = function_name
+        props.settings_repr = repr(settings)
+
+    @classmethod
+    def iter_final_subclasses(cls):
+        yield from filter(lambda x: issubclass(x, bpy.types.Node), iter_subclasses_recursive(cls))
+
+    def find_input(self, identifier):
+        for socket in self.inputs:
+            if socket.identifier == identifier:
+                return socket
+        else:
+            return None
+
+    def find_output(self, identifier):
+        for socket in self.outputs:
+            if socket.identifier == identifier:
+                return socket
+        else:
+            return None
+
+    def find_socket(self, identifier, is_output):
+        if is_output:
+            return self.find_output(identifier)
+        else:
+            return self.find_input(identifier)
+
+    def iter_sockets(self):
+        yield from self.inputs
+        yield from self.outputs
+
+    # Storage
+    #########################
+
+    @property
+    def decl_map(self):
+        if self not in _decl_map_per_node:
+            builder = self.get_node_builder()
+            _decl_map_per_node[self] = builder.get_sockets_decl_map()
+        return _decl_map_per_node[self]
+
+    @property
+    def socket_value_states(self):
+        if self not in _socket_value_states_per_node:
+            _socket_value_states_per_node[self] = SocketValueStates(self)
+        return _socket_value_states_per_node[self]
+
+    def free(self):
+        if self in _decl_map_per_node:
+            del _decl_map_per_node[self]
+
+    def copy(self, src_node):
+        self.identifier = get_new_node_identifier()
+        self.duplicate(src_node)
+
+    def duplicate(self, src_node):
+        pass
+
+
+class BaseSocket:
+    color = (0, 0, 0, 0)
+
+    def draw_color(self, context, node):
+        return self.color
+
+    def draw(self, context, layout, node, text):
+        decl, index = self.get_decl_with_index(node)
+        node.draw_socket(layout, self, text, decl, index)
+
+    def draw_self(self, layout, node, text):
+        layout.label(text=text)
+
+    def get_index(self, node):
+        if self.is_output:
+            return tuple(node.outputs).index(self)
+        else:
+            return tuple(node.inputs).index(self)
+
+    def to_id(self, node):
+        return (node, self.is_output, self.identifier)
+
+    def get_decl(self, node):
+        return node.decl_map.get_decl_by_socket(self)
+
+    def get_decl_with_index(self, node):
+        decl_map = node.decl_map
+        decl = decl_map.get_decl_by_socket(self)
+        index = decl_map.get_socket_index_in_decl(self)
+        return decl, index
+
+class FunctionNode(BaseNode):
+    pass
+
+class SimulationNode(BaseNode):
+    pass
+
+class DataSocket(BaseSocket):
+    def draw_self(self, layout, node, text):
+        if not (self.is_linked or self.is_output) and hasattr(self, "draw_property"):
+            self.draw_property(layout, node, text)
+        else:
+            layout.label(text=text)
+
+    def get_state(self):
+        return None
+
+    def restore_state(self, state):
+        pass
+
+class LinkageState:
+    def __init__(self, node):
+        self.node = node
+        self.tree = node.tree
+        self.links_per_input = defaultdict(set)
+        self.links_per_output = defaultdict(set)
+
+        for link in self.tree.links:
+            if link.from_node == node:
+                self.links_per_output[link.from_socket.identifier].add(link.to_socket)
+            if link.to_node == node:
+                self.links_per_input[link.to_socket.identifier].add(link.from_socket)
+
+    def try_restore(self):
+        tree = self.tree
+        for socket in self.node.inputs:
+            for from_socket in self.links_per_input[socket.identifier]:
+                tree.links.new(socket, from_socket)
+        for socket in self.node.outputs:
+            for to_socket in self.links_per_output[socket.identifier]:
+                tree.links.new(to_socket, socket)
+
+
+_decl_map_per_node = {}
+_socket_value_states_per_node = {}
+
+@bpy.app.handlers.persistent
+def clear_cached_node_states(_):
+    _decl_map_per_node.clear()
+    _socket_value_states_per_node.clear()
+
+def register():
+    bpy.app.handlers.load_pre.append(clear_cached_node_states)

release/scripts/startup/nodes/bparticle_nodes/always_execute.py

@@ -0,0 +1,26 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+
+class AlwaysExecuteNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_AlwaysExecuteNode"
+    bl_label = "Always Execute"
+
+    execute__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.execute_input("execute", "Execute", "execute__prop")
+        builder.influences_output("influence", "Influence")
+
+
+class MultiExecuteNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_MultiExecuteNode"
+    bl_label = "Multi Execute"
+
+    execute__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.execute_input("execute", "Execute", "execute__prop")
+        builder.execute_output("execute", "Execute")

release/scripts/startup/nodes/bparticle_nodes/combine_influences.py

@@ -0,0 +1,11 @@
+import bpy
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class CombineInfluencesNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_CombineInfluencesNode"
+    bl_label = "Combine Influences"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.influences_input("influences", "Influences")
+        builder.influences_output("influences", "Influences")

release/scripts/startup/nodes/bparticle_nodes/condition.py

@@ -0,0 +1,18 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class ParticleConditionNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_ParticleConditionNode"
+    bl_label = "Particle Condition"
+
+    execute_if_true__prop: NodeBuilder.ExecuteInputProperty()
+    execute_if_false__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("condition", "Condition", "Boolean")
+        builder.execute_input("execute_if_true", "Execute If True", "execute_if_true__prop")
+        builder.execute_input("execute_if_false", "Execute If False", "execute_if_false__prop")
+
+        builder.execute_output("execute", "Execute")

release/scripts/startup/nodes/bparticle_nodes/custom_attributes.py

@@ -0,0 +1,46 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode, FunctionNode
+from .. node_builder import NodeBuilder
+
+class SetParticleAttributeNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_SetParticleAttributeNode"
+    bl_label = "Set Attribute"
+
+    attribute_type: StringProperty(
+        name="Attribute Type",
+        default="Float",
+        update=SimulationNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("name", "Name", "Text", default="My Attribute", display_name=False)
+        builder.fixed_input("value", "Value", self.attribute_type)
+        builder.execute_output("execute", "Execute")
+
+    def draw(self, layout):
+        self.invoke_type_selection(layout, "set_type", "Select Type", mode="BASE", icon="SETTINGS")
+
+    def set_type(self, data_type):
+        self.attribute_type = data_type
+
+
+class GetParticleAttributeNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GetParticleAttributeNode"
+    bl_label = "Get Attribute"
+
+    attribute_type: StringProperty(
+        name="Attribute Type",
+        default="Float",
+        update=SimulationNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("name", "Name", "Text", default="My Attribute", display_name=False)
+        builder.fixed_output("value", "Value", self.attribute_type)
+
+    def draw(self, layout):
+        self.invoke_type_selection(layout, "set_type", "Select Type", mode="BASE", icon="SETTINGS")
+
+    def set_type(self, data_type):
+        self.attribute_type = data_type

release/scripts/startup/nodes/bparticle_nodes/custom_emitter.py

@@ -0,0 +1,169 @@
+import bpy
+import uuid
+from bpy.props import *
+from .. base import SimulationNode, DataSocket, FunctionNode
+from .. node_builder import NodeBuilder
+from .. types import type_infos
+from .. sync import skip_syncing
+
+
+class CustomEmitterAttribute(bpy.types.PropertyGroup):
+    def sync_tree(self, context):
+        self.id_data.sync()
+
+    attribute_name: StringProperty(update=sync_tree)
+    attribute_type: StringProperty(update=sync_tree)
+    identifier: StringProperty()
+    is_list: NodeBuilder.VectorizedProperty()
+
+
+class CustomEmitter(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_CustomEmitterNode"
+    bl_label = "Custom Emitter"
+
+    execute_on_birth__prop: NodeBuilder.ExecuteInputProperty()
+
+    attributes: CollectionProperty(
+        type=CustomEmitterAttribute,
+    )
+
+    birth_time_mode: EnumProperty(
+        name="Birth Time Mode",
+        items=[
+            ("NONE", "None", "Manually specify birth times of every particle", "NONE", 0),
+            ("BEGIN", "Begin", "Spawn particles at the beginning of each time step", "NONE", 1),
+            ("END", "End", "Spawn particles at the end of each time step", "NONE", 2),
+            ("RANDOM", "Random", "Spawn particles at random moments in the time step", "NONE", 3),
+            ("LINEAR", "Linear", "Distribute particles linearly in each time step", "NONE", 4),
+        ],
+        default="END",
+    )
+
+    def init_props(self):
+        self.add_attribute("Vector", "Position")
+
+    def declaration(self, builder: NodeBuilder):
+        for i, item in enumerate(self.attributes):
+            builder.vectorized_input(
+                item.identifier,
+                f"attributes[{i}].is_list",
+                item.attribute_name,
+                item.attribute_name,
+                item.attribute_type)
+        builder.execute_input("execute_on_birth", "Execute on Birth", "execute_on_birth__prop")
+        builder.influences_output("emitter", "Emitter")
+
+    def draw(self, layout):
+        layout.prop(self, "birth_time_mode", text="Birth")
+        self.invoke_type_selection(layout, "add_attribute", "Add Attribute", mode="BASE")
+
+    def draw_socket(self, layout, socket, text, decl, index_in_decl):
+        if isinstance(socket, DataSocket):
+            index = list(self.inputs).index(socket)
+            item = self.attributes[index]
+            col = layout.column(align=True)
+            row = col.row(align=True)
+            row.prop(item, "attribute_name", text="")
+            self.invoke_type_selection(row, "set_attribute_type", "",
+                icon="SETTINGS", mode="BASE", settings=(index, ))
+            self.invoke_function(row, "remove_attribute", "", icon="X", settings=(index, ))
+            if not socket.is_linked and hasattr(socket, "draw_property"):
+                socket.draw_property(col, self, "")
+        else:
+            decl.draw_socket(layout, socket, index_in_decl)
+
+    def add_attribute(self, data_type, name="My Attribute"):
+        with skip_syncing():
+            item = self.attributes.add()
+            item.identifier = str(uuid.uuid4())
+            item.attribute_type = data_type
+            item.attribute_name = name
+
+        self.sync_tree()
+
+    def remove_attribute(self, index):
+        self.attributes.remove(index)
+        self.sync_tree()
+
+    def set_attribute_type(self, data_type, index):
+        self.attributes[index].attribute_type = data_type
+
+class EmitterTimeInfoNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_EmitterTimeInfoNode"
+    bl_label = "Emitter Time Info"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_output("duration", "Duration", "Float")
+        builder.fixed_output("begin", "Begin", "Float")
+        builder.fixed_output("end", "End", "Float")
+        builder.fixed_output("step", "Step", "Integer")
+
+
+class SpawnParticlesAttribute(bpy.types.PropertyGroup):
+    def sync_tree(self, context):
+        self.id_data.sync()
+
+    attribute_name: StringProperty(update=sync_tree)
+    attribute_type: StringProperty(update=sync_tree)
+    identifier: StringProperty()
+    is_list: NodeBuilder.VectorizedProperty()
+
+
+class SpawnParticlesNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_SpawnParticlesNode"
+    bl_label = "Spawn Particles"
+
+    execute_on_birth__prop: NodeBuilder.ExecuteInputProperty()
+
+    attributes: CollectionProperty(
+        type=SpawnParticlesAttribute,
+    )
+
+    def init_props(self):
+        self.add_attribute("Vector", "Position")
+
+    def declaration(self, builder: NodeBuilder):
+        for i, item in enumerate(self.attributes):
+            builder.vectorized_input(
+                item.identifier,
+                f"attributes[{i}].is_list",
+                item.attribute_name,
+                item.attribute_name,
+                item.attribute_type)
+        builder.execute_input("execute_on_birth", "Execute on Birth", "execute_on_birth__prop")
+        builder.execute_output("execute", "Execute")
+        builder.influences_output("spawn_system", "Spawn System")
+
+    def draw(self, layout):
+        self.invoke_type_selection(layout, "add_attribute", "Add Attribute", mode="BASE")
+
+    def draw_socket(self, layout, socket, text, decl, index_in_decl):
+        if isinstance(socket, DataSocket):
+            index = list(self.inputs).index(socket)
+            item = self.attributes[index]
+            col = layout.column(align=True)
+            row = col.row(align=True)
+            row.prop(item, "attribute_name", text="")
+            self.invoke_type_selection(row, "set_attribute_type", "",
+                icon="SETTINGS", mode="BASE", settings=(index, ))
+            self.invoke_function(row, "remove_attribute", "", icon="X", settings=(index, ))
+            if not socket.is_linked and hasattr(socket, "draw_property"):
+                socket.draw_property(col, self, "")
+        else:
+            decl.draw_socket(layout, socket, index_in_decl)
+
+    def add_attribute(self, data_type, name="My Attribute"):
+        with skip_syncing():
+            item = self.attributes.add()
+            item.identifier = str(uuid.uuid4())
+            item.attribute_type = data_type
+            item.attribute_name = name
+
+        self.sync_tree()
+
+    def remove_attribute(self, index):
+        self.attributes.remove(index)
+        self.sync_tree()
+
+    def set_attribute_type(self, data_type, index):
+        self.attributes[index].attribute_type = data_type

release/scripts/startup/nodes/bparticle_nodes/events.py

@@ -0,0 +1,60 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode, FunctionNode
+from .. node_builder import NodeBuilder
+
+
+class AgeReachedEventNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_AgeReachedEventNode"
+    bl_label = "Age Reached Event"
+
+    execute_on_event__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("age", "Age", "Float", default=3)
+        builder.execute_input("execute_on_event", "Execute on Event", "execute_on_event__prop")
+
+        builder.influences_output("event", "Event")
+
+
+class MeshCollisionEventNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_MeshCollisionEventNode"
+    bl_label = "Mesh Collision Event"
+
+    execute_on_event__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("object", "Object", "Object")
+        builder.execute_input("execute_on_event", "Execute on Event", "execute_on_event__prop")
+
+        builder.influences_output("event", "Event")
+
+
+class CustomEventNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_CustomEventNode"
+    bl_label = "Custom Event"
+
+    execute_on_event__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("condition", "Condition", "Boolean")
+        builder.fixed_input("time_factor", "Time Factor", "Float", default=1.0)
+        builder.execute_input("execute_on_event", "Execute on Event", "execute_on_event__prop")
+
+        builder.influences_output("event", "Event")
+
+
+class EventFilterEndTimeNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_EventFilterEndTimeNode"
+    bl_label = "Event Filter End Time"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_output("end_time", "End Time", "Float")
+
+
+class EventFilterDurationNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_EventFilterDurationNode"
+    bl_label = "Event Filter Duration"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_output("duration", "Duration", "Float")

release/scripts/startup/nodes/bparticle_nodes/forces.py

@@ -0,0 +1,13 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+
+class ForceNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_ForceNode"
+    bl_label = "Force"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("force", "Force", "Vector")
+        builder.influences_output("force", "Force")

release/scripts/startup/nodes/bparticle_nodes/initial_grid_emitter.py

@@ -0,0 +1,19 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class InitialGridEmitterNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_InitialGridEmitterNode"
+    bl_label = "Initial Grid Emitter"
+
+    execute_on_birth__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("amount_x", "Amount X", "Integer", default=50)
+        builder.fixed_input("amount_y", "Amount Y", "Integer", default=50)
+        builder.fixed_input("step_x", "Step X", "Float", default=0.2)
+        builder.fixed_input("step_y", "Step Y", "Float", default=0.2)
+        builder.fixed_input("size", "Size", "Float", default=0.01)
+        builder.execute_input("execute_on_birth", "Execute on Birth", "execute_on_birth__prop")
+        builder.influences_output("emitter", "Emitter")

release/scripts/startup/nodes/bparticle_nodes/mesh_emitter.py

@@ -0,0 +1,32 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class MeshEmitterNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_MeshEmitterNode"
+    bl_label = "Mesh Emitter"
+
+    execute_on_birth__prop: NodeBuilder.ExecuteInputProperty()
+
+    density_mode: EnumProperty(
+        name="Density Mode",
+        items=[
+            ('UNIFORM', "Uniform", "", 'NONE', 0),
+            ('VERTEX_WEIGHTS', "Vertex Weights", "", 'NONE', 1),
+        ],
+        update=SimulationNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("object", "Object", "Object")
+        builder.fixed_input("rate", "Rate", "Float", default=10)
+
+        if self.density_mode == 'VERTEX_WEIGHTS':
+            builder.fixed_input("density_vertex_group", "Density Group", "Text")
+
+        builder.execute_input("execute_on_birth", "Execute on Birth", "execute_on_birth__prop")
+        builder.influences_output("emitter", "Emitter")
+
+    def draw(self, layout):
+        layout.prop(self, "density_mode")

release/scripts/startup/nodes/bparticle_nodes/particle_system.py

@@ -0,0 +1,15 @@
+import bpy
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class ParticleSystemNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_ParticleSystemNode"
+    bl_label = "Particle System"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.background_color((0.8, 0.5, 0.4))
+
+        builder.influences_input("influences", "Influences")
+
+    def draw(self, layout):
+        layout.prop(self, "name", text="", icon="PHYSICS")

release/scripts/startup/nodes/bparticle_nodes/point_emitter.py

@@ -0,0 +1,17 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class PointEmitterNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_PointEmitterNode"
+    bl_label = "Point Emitter"
+
+    execute_on_birth__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("position", "Position", "Vector")
+        builder.fixed_input("velocity", "Velocity", "Vector", default=(1, 0, 0))
+        builder.fixed_input("size", "Size", "Float", default=0.01)
+        builder.execute_input("execute_on_birth", "Execute on Birth", "execute_on_birth__prop")
+        builder.influences_output("emitter", "Emitter")

release/scripts/startup/nodes/bparticle_nodes/size_over_time.py

@@ -0,0 +1,13 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class SizeOverTimeNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_SizeOverTimeNode"
+    bl_label = "Size Over Time"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("final_size", "Final Size", "Float", default=0.0)
+        builder.fixed_input("final_age", "Final Age", "Float", default=3)
+        builder.influences_output("influence", "Influence")

release/scripts/startup/nodes/bparticle_nodes/trails.py

@@ -0,0 +1,16 @@
+import bpy
+from bpy.props import *
+from .. base import SimulationNode
+from .. node_builder import NodeBuilder
+
+class ParticleTrailsNode(bpy.types.Node, SimulationNode):
+    bl_idname = "fn_ParticleTrailsNode"
+    bl_label = "Particle Trails"
+
+    execute_on_birth__prop: NodeBuilder.ExecuteInputProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("rate", "Rate", "Float", default=20)
+        builder.execute_input("execute_on_birth", "Execute on Birth", "execute_on_birth__prop")
+        builder.influences_output("main_system", "Main System")
+        builder.influences_output("trail_system", "Trail System")

release/scripts/startup/nodes/declaration/__init__.py

@@ -0,0 +1,12 @@
+from . base import NoDefaultValue
+from . fixed_type import FixedSocketDecl
+from . dynamic_list import ListSocketDecl
+from . base_list_variadic import BaseListVariadic
+from . vectorized import VectorizedInputDecl, VectorizedOutputDecl
+
+from . bparticles import (
+    InfluencesSocketDecl,
+    ExecuteOutputDecl,
+    ExecuteInputDecl,
+    ExecuteInputListDecl,
+)

release/scripts/startup/nodes/declaration/base.py

@@ -0,0 +1,38 @@
+NoDefaultValue = object()
+
+class SocketDeclBase:
+    def init(self):
+        pass
+
+    def build(self, node_sockets):
+        raise NotImplementedError()
+
+    def init_default(self, node_sockets):
+        pass
+
+    def amount(self):
+        raise NotImplementedError()
+
+    def validate(self, sockets):
+        raise NotImplementedError()
+
+    def draw_node(self, layout):
+        pass
+
+    def draw_socket(self, layout, socket, index):
+        socket.draw_self(layout, self, socket.name)
+
+    def operator_socket_call(self, own_socket, other_socket):
+        pass
+
+    def _data_socket_test(self, socket, name, data_type, identifier):
+        from .. base import DataSocket
+        if not isinstance(socket, DataSocket):
+            return False
+        if socket.name != name:
+            return False
+        if socket.data_type != data_type:
+            return False
+        if socket.identifier != identifier:
+            return False
+        return True

release/scripts/startup/nodes/declaration/base_list_variadic.py

@@ -0,0 +1,152 @@
+import bpy
+import uuid
+from bpy.props import *
+from . base import SocketDeclBase
+from .. base import DataSocket
+from .. types import type_infos
+from .. sockets import OperatorSocket
+
+class BaseListVariadic(SocketDeclBase):
+    def __init__(self, node, identifier: str, prop_name: str, base_type: str, default_amount: int):
+        self.node = node
+        self.identifier_suffix = identifier
+        self.prop_name = prop_name
+        self.base_type = base_type
+        self.list_type = type_infos.to_list(base_type)
+        self.default_amount = default_amount
+
+    def init(self):
+        collection = self.get_collection()
+        for _ in range(self.default_amount):
+            item = collection.add()
+            item.state = "BASE"
+            item.identifier = str(uuid.uuid4())
+
+    def build(self, node_sockets):
+        return list(self._build(node_sockets))
+
+    def _build(self, node_sockets):
+        for item in self.get_collection():
+            data_type = self.base_type if item.state == "BASE" else self.list_type
+            yield type_infos.build(
+                data_type,
+                node_sockets,
+                "",
+                item.identifier)
+        yield node_sockets.new("fn_OperatorSocket", "Operator")
+
+    def validate(self, sockets):
+        collection = self.get_collection()
+        if len(sockets) != len(collection) + 1:
+            return False
+
+        for socket, item in zip(sockets[:-1], collection):
+            data_type = self.base_type if item.state == "BASE" else self.list_type
+            if not self._data_socket_test(socket, "", data_type, item.identifier):
+                return False
+
+        if sockets[-1].bl_idname != "fn_OperatorSocket":
+            return False
+
+        return True
+
+    def draw_socket(self, layout, socket, index):
+        if isinstance(socket, OperatorSocket):
+            props = layout.operator("fn.new_base_list_variadic_input", text="New Input", icon='ADD')
+            props.tree_name = self.node.tree.name
+            props.node_name = self.node.name
+            props.prop_name = self.prop_name
+        else:
+            row = layout.row(align=True)
+            socket.draw_self(row, self.node, str(index))
+            props = row.operator("fn.remove_base_list_variadic_input", text="", icon='X')
+            props.tree_name = self.node.tree.name
+            props.node_name = self.node.name
+            props.prop_name = self.prop_name
+            props.index = index
+
+    def operator_socket_call(self, own_socket, linked_socket, connected_sockets):
+        if len(connected_sockets) != 1:
+            return
+        connected_socket = next(iter(connected_sockets))
+        if not isinstance(connected_socket, DataSocket):
+            return
+
+        is_output = own_socket.is_output
+        origin_data_type = connected_socket.data_type
+
+        if type_infos.is_link_allowed(origin_data_type, self.base_type):
+            state = "BASE"
+        elif type_infos.is_link_allowed(origin_data_type, self.list_type):
+            state = "LIST"
+        else:
+            return
+
+        collection = self.get_collection()
+        item = collection.add()
+        item.state = state
+        item.identifier = str(uuid.uuid4())
+
+        self.node.rebuild()
+
+        new_socket = self.node.find_socket(item.identifier, is_output)
+        self.node.tree.new_link(linked_socket, new_socket)
+
+    def amount(self):
+        return len(self.get_collection()) + 1
+
+    def get_collection(self):
+        return getattr(self.node, self.prop_name)
+
+    @classmethod
+    def Property(cls):
+        return CollectionProperty(type=BaseListVariadicPropertyGroup)
+
+class BaseListVariadicPropertyGroup(bpy.types.PropertyGroup):
+    bl_idname = "fn_BaseListVariadicPropertyGroup"
+
+    state: EnumProperty(
+        default="BASE",
+        items=[
+            ("BASE", "Base", "", "NONE", 0),
+            ("LIST", "Base", "", "NONE", 1)])
+    identifier: StringProperty()
+
+class NewBaseListVariadicInputOperator(bpy.types.Operator):
+    bl_idname = "fn.new_base_list_variadic_input"
+    bl_label = "New Pack List Input"
+    bl_options = {'INTERNAL'}
+
+    tree_name: StringProperty()
+    node_name: StringProperty()
+    prop_name: StringProperty()
+
+    def execute(self, context):
+        tree = bpy.data.node_groups[self.tree_name]
+        node = tree.nodes[self.node_name]
+        collection = getattr(node, self.prop_name)
+
+        item = collection.add()
+        item.state = "BASE"
+        item.identifier = str(uuid.uuid4())
+
+        tree.sync()
+        return {'FINISHED'}
+
+class RemoveBaseListVariadicInputOperator(bpy.types.Operator):
+    bl_idname = "fn.remove_base_list_variadic_input"
+    bl_label = "Remove Pack List Input"
+    bl_options = {'INTERNAL'}
+
+    tree_name: StringProperty()
+    node_name: StringProperty()
+    prop_name: StringProperty()
+    index: IntProperty()
+
+    def execute(self, context):
+        tree = bpy.data.node_groups[self.tree_name]
+        node = tree.nodes[self.node_name]
+        collection = getattr(node, self.prop_name)
+        collection.remove(self.index)
+        tree.sync()
+        return {'FINISHED'}

release/scripts/startup/nodes/declaration/bparticles.py

@@ -0,0 +1,180 @@
+import bpy
+import uuid
+from bpy.props import *
+from . base import SocketDeclBase
+from .. sockets import OperatorSocket, ExecuteSocket
+
+MAX_LINK_LIMIT = 4095
+
+class InfluencesSocketDecl(SocketDeclBase):
+    def __init__(self, node, identifier: str, display_name: str):
+        self.node = node
+        self.identifier = identifier
+        self.display_name = display_name
+
+    def build(self, node_sockets):
+        socket = node_sockets.new("fn_InfluencesSocket", self.display_name, identifier=self.identifier)
+        socket.link_limit = MAX_LINK_LIMIT
+        socket.display_shape = 'DIAMOND'
+        return [socket]
+
+    def validate(self, sockets):
+        if len(sockets) != 1:
+            return False
+        socket = sockets[0]
+        if socket.bl_idname != "fn_InfluencesSocket":
+            return False
+        if socket.name != self.display_name:
+            return False
+        if socket.link_limit != MAX_LINK_LIMIT:
+            return False
+        return True
+
+    def amount(self):
+        return 1
+
+class ExecuteOutputDecl(SocketDeclBase):
+    def __init__(self, node, identifier: str, display_name: str):
+        self.node = node
+        self.identifier = identifier
+        self.display_name = display_name
+
+    def build(self, node_sockets):
+        socket = node_sockets.new("fn_ExecuteSocket", self.display_name, identifier=self.identifier)
+        socket.display_shape = 'SQUARE'
+        return [socket]
+
+    def amount(self):
+        return 1
+
+    def validate(self, sockets):
+        if len(sockets) != 1:
+            return False
+        socket = sockets[0]
+        if socket.name != self.display_name:
+            return False
+        elif socket.identifier != self.identifier:
+            return False
+        elif socket.bl_idname != "fn_ExecuteSocket":
+            return False
+        return True
+
+
+class ExecuteInputDecl(SocketDeclBase):
+    def __init__(self, node, identifier: str, display_name: str):
+        self.node = node
+        self.identifier = identifier
+        self.display_name = display_name
+
+    def build(self, node_sockets):
+        socket = node_sockets.new("fn_ExecuteSocket", self.display_name, identifier=self.identifier)
+        socket.display_shape = "SQUARE"
+        return [socket]
+
+    def amount(self):
+        return 1
+
+    def validate(self, sockets):
+        if len(sockets) != 1:
+            return False
+        if sockets[0].bl_idname != "fn_ExecuteSocket":
+            return False
+        return True
+
+
+class ExecuteInputListDecl(SocketDeclBase):
+    def __init__(self, node, identifier: str, prop_name: str, display_name: str):
+        self.node = node
+        self.identifier = identifier
+        self.display_name = display_name
+        self.prop_name = prop_name
+
+    def build(self, node_sockets):
+        return list(self._build(node_sockets))
+
+    def _build(self, node_sockets):
+        items = self.get_items()
+        for i, item in enumerate(items):
+            socket = node_sockets.new(
+                "fn_ExecuteSocket",
+                self.display_name if i == 0 else "Then",
+                identifier=item.identifier)
+            socket.display_shape = 'SQUARE'
+            yield socket
+        socket = node_sockets.new(
+            "fn_OperatorSocket",
+            self.display_name)
+        socket.display_shape = 'SQUARE'
+        yield socket
+
+    def amount(self):
+        return len(self.get_items()) + 1
+
+    def get_items(self):
+        return getattr(self.node, self.prop_name)
+
+    def validate(self, sockets):
+        if len(sockets) != self.amount():
+            return False
+
+        for socket, item in zip(sockets[:-1], self.get_items()):
+            if socket.identifier != item.identifier:
+                return False
+            elif socket.bl_idname != "fn_ExecuteSocket":
+                return False
+
+        if not isinstance(sockets[-1], OperatorSocket):
+            return False
+        if not sockets[-1].name == self.display_name:
+            return False
+
+        return True
+
+    def draw_socket(self, layout, socket, index):
+        row = layout.row(align=True)
+        if index == 0:
+            row.label(text=self.display_name)
+        else:
+            row.label(text="Then")
+        if isinstance(socket, ExecuteSocket):
+            props = row.operator("fn.remove_execute_socket", text="", icon="X")
+            props.tree_name = socket.id_data.name
+            props.node_name = self.node.name
+            props.prop_name = self.prop_name
+            props.index = index
+
+    def operator_socket_call(self, own_socket, linked_socket, connected_sockets):
+        item = self.get_items().add()
+        item.identifier = str(uuid.uuid4())
+
+        self.node.rebuild()
+
+        new_socket = self.node.find_socket(item.identifier, False)
+        self.node.tree.new_link(linked_socket, new_socket)
+
+    @classmethod
+    def Property(cls):
+        return CollectionProperty(type=ExecuteInputItem)
+
+
+class ExecuteInputItem(bpy.types.PropertyGroup):
+    identifier: StringProperty()
+
+
+class RemoveExecuteSocketOperator(bpy.types.Operator):
+    bl_idname = "fn.remove_execute_socket"
+    bl_label = "Remove Execute Socket"
+    bl_options = {'INTERNAL'}
+
+    tree_name: StringProperty()
+    node_name: StringProperty()
+    prop_name: StringProperty()
+    index: IntProperty()
+
+    def execute(self, context):
+        tree = bpy.data.node_groups[self.tree_name]
+        node = tree.nodes[self.node_name]
+        collection = getattr(node, self.prop_name)
+        collection.remove(self.index)
+        tree.sync()
+        return {'FINISHED'}

release/scripts/startup/nodes/declaration/dynamic_list.py

@@ -0,0 +1,41 @@
+from bpy.props import *
+from . base import SocketDeclBase
+from .. types import type_infos
+
+class ListSocketDecl(SocketDeclBase):
+    def __init__(self, node, identifier: str, display_name: str, prop_name: str, list_or_base: str):
+        self.node = node
+        self.identifier = identifier
+        self.display_name = display_name
+        self.prop_name = prop_name
+        self.list_or_base = list_or_base
+
+    def build(self, node_sockets):
+        data_type = self.get_data_type()
+        return [type_infos.build(
+            data_type,
+            node_sockets,
+            self.display_name,
+            self.identifier)]
+
+    def validate(self, sockets):
+        if len(sockets) != 1:
+            return False
+        return self._data_socket_test(sockets[0],
+            self.display_name, self.get_data_type(), self.identifier)
+
+    def get_data_type(self):
+        base_type = getattr(self.node, self.prop_name)
+        if self.list_or_base == "BASE":
+            return base_type
+        elif self.list_or_base == "LIST":
+            return type_infos.to_list(base_type)
+        else:
+            assert False
+
+    def amount(self):
+        return 1
+
+    @classmethod
+    def Property(cls):
+        return StringProperty(default="Float")

release/scripts/startup/nodes/declaration/fixed_type.py

@@ -0,0 +1,38 @@
+from . base import SocketDeclBase, NoDefaultValue
+from .. types import type_infos
+
+class FixedSocketDecl(SocketDeclBase):
+    def __init__(self, node, identifier: str, display_name: str, data_type: str, default, socket_settings: dict):
+        self.node = node
+        self.identifier = identifier
+        self.display_name = display_name
+        self.data_type = data_type
+        self.default = default
+        self.socket_settings = socket_settings
+
+    def build(self, node_sockets):
+        socket = type_infos.build(self.data_type,
+                                  node_sockets,
+                                  self.display_name,
+                                  self.identifier)
+        for name, value in self.socket_settings.items():
+            setattr(socket, name, value)
+        return [socket]
+
+    def init_default(self, node_sockets):
+        if self.default is not NoDefaultValue:
+            socket = node_sockets[0]
+            socket.restore_state(self.default)
+
+    def validate(self, sockets):
+        if len(sockets) != 1:
+            return False
+        socket = sockets[0]
+        for name, value in self.socket_settings.items():
+            if getattr(socket, name) != value:
+                return False
+        return self._data_socket_test(sockets[0],
+            self.display_name, self.data_type, self.identifier)
+
+    def amount(self):
+        return 1

release/scripts/startup/nodes/declaration/vectorized.py

@@ -0,0 +1,94 @@
+import bpy
+from bpy.props import *
+from . base import SocketDeclBase, NoDefaultValue
+from .. types import type_infos
+from .. utils.generic import getattr_recursive
+
+class VectorizedDeclBase:
+    def build(self, node_sockets):
+        data_type, name = self.get_type_and_name()
+        socket = type_infos.build(
+            data_type,
+            node_sockets,
+            name,
+            self.identifier)
+        for prop_name, value in self.socket_settings.items():
+            setattr(socket, prop_name, value)
+        return [socket]
+
+    def validate(self, sockets):
+        if len(sockets) != 1:
+            return False
+
+        socket = sockets[0]
+        for prop_name, value in self.socket_settings.items():
+            if getattr(socket, prop_name) != value:
+                return False
+
+        data_type, name = self.get_type_and_name()
+        return self._data_socket_test(socket,
+            name, data_type, self.identifier)
+
+    def amount(self):
+        return 1
+
+    def get_type_and_name(self):
+        if self.is_vectorized():
+            return self.list_type, self.list_name
+        else:
+            return self.base_type, self.base_name
+
+
+class VectorizedInputDecl(VectorizedDeclBase, SocketDeclBase):
+    def __init__(self,
+            node, identifier, prop_name,
+            base_name, list_name,
+            base_type, default, socket_settings):
+        self.node = node
+        self.identifier = identifier
+        self.prop_name = prop_name
+        self.base_name = base_name
+        self.list_name = list_name
+        self.base_type = base_type
+        self.list_type = type_infos.to_list(base_type)
+        self.default = default
+        self.socket_settings = socket_settings
+
+    def init_default(self, node_sockets):
+        if self.default is not NoDefaultValue:
+            socket = node_sockets[0]
+            socket.restore_state(self.default)
+
+    def is_vectorized(self):
+        stored = getattr_recursive(self.node, self.prop_name)
+        if stored == "BASE":
+            return False
+        elif stored == "LIST":
+            return True
+        else:
+            assert False
+
+    @staticmethod
+    def Property():
+        return StringProperty(default="BASE")
+
+
+class VectorizedOutputDecl(VectorizedDeclBase, SocketDeclBase):
+    def __init__(self,
+            node, identifier, input_prop_names,
+            base_name, list_name,
+            base_type, socket_settings):
+        self.node = node
+        self.identifier = identifier
+        self.input_prop_names = input_prop_names
+        self.base_name = base_name
+        self.list_name = list_name
+        self.base_type = base_type
+        self.list_type = type_infos.to_list(base_type)
+        self.socket_settings = socket_settings
+
+    def is_vectorized(self):
+        for prop_name in self.input_prop_names:
+            if getattr_recursive(self.node, prop_name) == "LIST":
+                return True
+        return False

release/scripts/startup/nodes/file_load.py

@@ -0,0 +1,14 @@
+import bpy
+from bpy.app.handlers import persistent
+
+@persistent
+def file_load_handler(dummy):
+    from . sync import sync_trees_and_dependent_trees
+    node_trees = set(tree for tree in bpy.data.node_groups if tree.bl_idname == "FunctionTree")
+    sync_trees_and_dependent_trees(node_trees)
+
+def register():
+    bpy.app.handlers.load_post.append(file_load_handler)
+
+def unregister():
+    bpy.app.handlers.load_post.remove(file_load_handler)

release/scripts/startup/nodes/function_nodes/color.py

@@ -0,0 +1,58 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+
+class SeparateColorNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_SeparateColorNode"
+    bl_label = "Separate Color"
+
+    use_list__color: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input(
+            "color", "use_list__color",
+            "Color", "Colors", "Color")
+
+        builder.vectorized_output(
+            "red", ["use_list__color"],
+            "Red", "Red", "Float")
+        builder.vectorized_output(
+            "green", ["use_list__color"],
+            "Green", "Green", "Float")
+        builder.vectorized_output(
+            "blue", ["use_list__color"],
+            "Blue", "Blue", "Float")
+        builder.vectorized_output(
+            "alpha", ["use_list__color"],
+            "Alpha", "Alpha", "Float")
+
+
+class CombineColorNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_CombineColorNode"
+    bl_label = "Combine Color"
+
+    use_list__red: NodeBuilder.VectorizedProperty()
+    use_list__green: NodeBuilder.VectorizedProperty()
+    use_list__blue: NodeBuilder.VectorizedProperty()
+    use_list__alpha: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input(
+            "red", "use_list__red",
+            "Red", "Red", "Float")
+        builder.vectorized_input(
+            "green", "use_list__green",
+            "Green", "Green", "Float")
+        builder.vectorized_input(
+            "blue", "use_list__blue",
+            "Blue", "Blue", "Float")
+        builder.vectorized_input(
+            "alpha", "use_list__alpha",
+            "Alpha", "Alpha", "Float",
+            default=1.0)
+
+        builder.vectorized_output(
+            "color", ["use_list__red", "use_list__green", "use_list__blue", "use_list__alpha"],
+            "Color", "Colors", "Color")

release/scripts/startup/nodes/function_nodes/float_range.py

@@ -0,0 +1,31 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+class FloatRangeNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_FloatRangeNode"
+    bl_label = "Float Range"
+
+    mode: EnumProperty(
+        name="Mode",
+        items=[
+            ("AMOUNT_START_STEP", "Amount / Start / Step", "", "NONE", 0),
+            ("AMOUNT_START_STOP", "Amount / Start / Stop", "", "NONE", 1),
+        ],
+        default="AMOUNT_START_STOP",
+        update=FunctionNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("amount", "Amount", "Integer", default=10)
+        builder.fixed_input("start", "Start", "Float")
+        if self.mode == "AMOUNT_START_STEP":
+            builder.fixed_input("step", "Step", "Float")
+        elif self.mode == "AMOUNT_START_STOP":
+            builder.fixed_input("stop", "Stop", "Float", default=1)
+
+        builder.fixed_output("list", "List", "Float List")
+
+    def draw(self, layout):
+        layout.prop(self, "mode", text="")

release/scripts/startup/nodes/function_nodes/groups.py

@@ -0,0 +1,524 @@
+import bpy
+from bpy.props import *
+from .. types import type_infos
+from .. base import BaseNode, FunctionNode, DataSocket
+from .. function_tree import FunctionTree
+from .. node_builder import NodeBuilder
+from .. ui import NodeSidebarPanel
+from .. utils.pie_menu_helper import PieMenuHelper
+from .. sync import skip_syncing
+
+interface_type_items = [
+    ("DATA", "Data", "Some data type like integer or vector", "NONE", 0),
+    ("EXECUTE", "Control Flow", "", "NONE", 1),
+    ("INFLUENCES", "Influences", "", "NONE", 2),
+]
+
+class GroupInputNode(bpy.types.Node, BaseNode):
+    bl_idname = "fn_GroupInputNode"
+    bl_label = "Group Input"
+
+    input_name: StringProperty(
+        default="Name",
+        update=BaseNode.sync_tree,
+    )
+
+    sort_index: IntProperty()
+
+    display_settings: BoolProperty(
+        name="Display Settings",
+        default=False,
+    )
+
+    interface_type: EnumProperty(
+        items=interface_type_items,
+        default="DATA",
+        update= BaseNode.sync_tree,
+    )
+
+    data_type: StringProperty(
+        default="Float",
+        update=BaseNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        if self.interface_type == "DATA":
+            builder.fixed_output("value", "Value", self.data_type)
+        elif self.interface_type == "EXECUTE":
+            builder.execute_output("execute", "Execute")
+        elif self.interface_type == "INFLUENCES":
+            builder.influences_output("influences", "Influences")
+        else:
+            assert False
+
+    def draw(self, layout):
+        if not self.display_settings:
+            return
+
+        layout.prop(self, "interface_type", text="")
+
+        if self.interface_type == "DATA":
+            if hasattr(self.outputs[0], "draw_property"):
+                self.outputs[0].draw_property(layout, self, "Default")
+
+            self.invoke_type_selection(layout, "set_data_type", "Select Type")
+
+    def draw_socket(self, layout, socket, text, decl, index_in_decl):
+        row = layout.row(align=True)
+        row.prop(self, "input_name", text="")
+        row.prop(self, "display_settings", text="", icon="SETTINGS")
+
+    def draw_closed_label(self):
+        return self.input_name + " (Input)"
+
+    def set_data_type(self, data_type):
+        self.data_type = data_type
+
+
+class GroupOutputNode(bpy.types.Node, BaseNode):
+    bl_idname = "fn_GroupOutputNode"
+    bl_label = "Group Output"
+
+    sort_index: IntProperty()
+
+    display_settings: BoolProperty(
+        name="Display Settings",
+        default=False,
+    )
+
+    output_name: StringProperty(
+        default="Name",
+        update=BaseNode.sync_tree,
+    )
+
+    interface_type: EnumProperty(
+        items=interface_type_items,
+        default="DATA",
+        update=BaseNode.sync_tree,
+    )
+
+    data_type: StringProperty(
+        default="Float",
+        update=BaseNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        if self.interface_type == "DATA":
+            builder.fixed_input("value", "Value", self.data_type)
+        elif self.interface_type == "EXECUTE":
+            builder.single_execute_input("execute", "Execute")
+        elif self.interface_type == "INFLUENCES":
+            builder.influences_input("influences", "Influences")
+
+    def draw(self, layout):
+        if not self.display_settings:
+            return
+
+        layout.prop(self, "interface_type", text="")
+
+        if self.interface_type == "DATA":
+            self.invoke_type_selection(layout, "set_type_type", "Select Type")
+
+    def draw_socket(self, layout, socket, text, decl, index_in_decl):
+        row = layout.row(align=True)
+        row.prop(self, "output_name", text="")
+        row.prop(self, "display_settings", text="", icon="SETTINGS")
+
+    def draw_closed_label(self):
+        return self.output_name + " (Output)"
+
+    def set_type_type(self, data_type):
+        self.data_type = data_type
+
+class GroupNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GroupNode"
+    bl_label = "Group"
+    bl_icon = "NODETREE"
+
+    node_group: PointerProperty(
+        type=bpy.types.NodeTree,
+        update=FunctionNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        if not isinstance(self.node_group, FunctionTree):
+            return
+
+        for input_node in self.node_group.get_input_nodes():
+            if input_node.interface_type == "DATA":
+                builder.fixed_input(
+                    input_node.identifier,
+                    input_node.input_name,
+                    input_node.data_type,
+                    default=input_node.outputs[0].get_state())
+            elif input_node.interface_type == "EXECUTE":
+                builder.single_execute_input(input_node.identifier, input_node.input_name)
+            elif input_node.interface_type == "INFLUENCES":
+                builder.influences_input(input_node.identifier, input_node.input_name)
+            else:
+                assert False
+
+        for output_node in self.node_group.get_output_nodes():
+            if output_node.interface_type == "DATA":
+                builder.fixed_output(
+                    output_node.identifier,
+                    output_node.output_name,
+                    output_node.data_type)
+            elif output_node.interface_type == "EXECUTE":
+                builder.execute_output(output_node.identifier, output_node.output_name)
+            elif output_node.interface_type == "INFLUENCES":
+                builder.influences_output(output_node.identifier, output_node.output_name)
+            else:
+                assert False
+
+    def draw(self, layout):
+        layout.scale_y = 1.3
+        if self.node_group is None:
+            self.invoke_group_selector(layout, "set_group", "Select Group", icon="NODETREE")
+        elif not isinstance(self.node_group, FunctionTree):
+            layout.label(text="Group not found!", icon="ERROR")
+            self.invoke_group_selector(layout, "set_group", "Change Group", icon="NODETREE")
+
+    def draw_advanced(self, layout):
+        col = layout.column()
+        text = "Select Group" if self.node_group is None else self.node_group.name
+        col.scale_y = 1.3
+        self.invoke_group_selector(col, "set_group", text, icon="NODETREE")
+
+    def draw_label(self):
+        if self.node_group is None:
+            return "(G) -"
+        else:
+            return "(G) " + self.node_group.name
+
+    def set_group(self, group):
+        self.node_group = group
+
+    def iter_directly_used_trees(self):
+        if self.node_group is not None:
+            yield self.node_group
+
+
+class GroupInterfacePanel(bpy.types.Panel, NodeSidebarPanel):
+    bl_idname = "FN_PT_group_interface_panel"
+    bl_label = "Group Interface"
+
+    @classmethod
+    def poll(self, context):
+        try: return isinstance(context.space_data.edit_tree, FunctionTree)
+        except: return False
+
+    def draw(self, context):
+        layout = self.layout
+        tree = context.space_data.edit_tree
+        draw_group_interface_panel(layout, tree)
+
+
+def draw_group_interface_panel(layout, tree):
+    col = layout.column(align=True)
+    col.label(text="Inputs:")
+    box = col.box().column(align=True)
+    for i, node in enumerate(tree.get_input_nodes()):
+        row = box.row(align=True)
+        row.prop(node, "input_name", text="")
+
+        props = row.operator("fn.move_group_interface", text="", icon="TRIA_UP")
+        props.is_input = True
+        props.from_index = i
+        props.offset = -1
+
+        props = row.operator("fn.move_group_interface", text="", icon="TRIA_DOWN")
+        props.is_input = True
+        props.from_index = i
+        props.offset = 1
+
+    col = layout.column(align=True)
+    col.label(text="Outputs:")
+    box = col.box().column(align=True)
+    for i, node in enumerate(tree.get_output_nodes()):
+        row = box.row(align=True)
+        row.prop(node, "output_name", text="")
+
+        props = row.operator("fn.move_group_interface", text="", icon="TRIA_UP")
+        props.is_input = False
+        props.from_index = i
+        props.offset = -1
+
+        props = row.operator("fn.move_group_interface", text="", icon="TRIA_DOWN")
+        props.is_input = False
+        props.from_index = i
+        props.offset = 1
+
+
+class MoveGroupInterface(bpy.types.Operator):
+    bl_idname = "fn.move_group_interface"
+    bl_label = "Move Group Interface"
+
+    is_input: BoolProperty()
+    from_index: IntProperty()
+    offset: IntProperty()
+
+    def execute(self, context):
+        tree = context.space_data.node_tree
+
+        if self.is_input:
+            nodes = tree.get_input_nodes()
+        else:
+            nodes = tree.get_output_nodes()
+
+        from_index = self.from_index
+        to_index = min(max(self.from_index + self.offset, 0), len(nodes) - 1)
+
+        nodes[from_index], nodes[to_index] = nodes[to_index], nodes[from_index]
+
+        with skip_syncing():
+            for i, node in enumerate(nodes):
+                node.sort_index = i
+        tree.sync()
+
+        return {"FINISHED"}
+
+
+def update_sort_indices(tree):
+    for i, node in enumerate(tree.get_input_nodes()):
+        node.sort_index = i
+    for i, node in enumerate(tree.get_output_nodes()):
+        node.sort_index = i
+
+
+class ManageGroupPieMenu(bpy.types.Menu, PieMenuHelper):
+    bl_idname = "FN_MT_manage_group_pie"
+    bl_label = "Manage Group"
+
+    @classmethod
+    def poll(cls, context):
+        try:
+            return isinstance(context.space_data.node_tree, FunctionTree)
+        except:
+            return False
+
+    def draw_top(self, layout):
+        layout.operator("fn.open_group_management_popup", text="Group Management")
+
+    def draw_left(self, layout):
+        node = bpy.context.active_node
+        if node is None:
+            self.empty(layout)
+            return
+
+        possible_inputs = [(i, socket) for i, socket in enumerate(node.inputs)
+                                       if socket_can_become_group_input(socket)]
+
+        if len(possible_inputs) == 0:
+            self.empty(layout, "No inputs.")
+        elif len(possible_inputs) == 1:
+            props = layout.operator("fn.create_group_input_for_socket", text="New Group Input")
+            props.input_index = possible_inputs[0][0]
+        else:
+            layout.operator("fn.create_group_input_for_socket_invoker", text="New Group Input")
+
+    def draw_right(self, layout):
+        node = bpy.context.active_node
+        if node is None:
+            self.empty(layout)
+            return
+
+        possible_outputs = [(i, socket) for i, socket in enumerate(node.outputs)
+                                        if socket_can_become_group_output(socket)]
+
+        if len(possible_outputs) == 0:
+            self.empty(layout, "No outputs.")
+        elif len(possible_outputs) == 1:
+            props = layout.operator("fn.create_group_output_for_socket", text="New Group Output")
+            props.output_index = possible_outputs[0][0]
+        else:
+            layout.operator("fn.create_group_output_for_socket_invoker", text="New Group Output")
+
+
+class OpenGroupManagementPopup(bpy.types.Operator):
+    bl_idname = "fn.open_group_management_popup"
+    bl_label = "Group Management"
+
+    def invoke(self, context, event):
+        return context.window_manager.invoke_props_dialog(self)
+
+    def draw(self, context):
+        draw_group_interface_panel(self.layout, context.space_data.node_tree)
+
+    def execute(self, context):
+        return {"INTERFACE"}
+
+
+class CreateGroupInputForSocketInvoker(bpy.types.Operator):
+    bl_idname = "fn.create_group_input_for_socket_invoker"
+    bl_label = "Create Group Input for Socket Invoker"
+
+    def invoke(self, context, event):
+        context.window_manager.popup_menu(self.draw_menu)
+        return {"CANCELLED"}
+
+    @staticmethod
+    def draw_menu(menu, context):
+        node = bpy.context.active_node
+        if node is None:
+            return
+
+        layout = menu.layout.column()
+        layout.operator_context = "INVOKE_DEFAULT"
+
+        for i, socket in enumerate(node.inputs):
+            if socket_can_become_group_input(socket):
+                props = layout.operator("fn.create_group_input_for_socket", text=socket.name)
+                props.input_index = i
+
+
+class CreateGroupOutputForSocketInvoker(bpy.types.Operator):
+    bl_idname = "fn.create_group_output_for_socket_invoker"
+    bl_label = "Create Group Output for Socket Invoker"
+
+    def invoke(self, context, event):
+        context.window_manager.popup_menu(self.draw_menu)
+        return {"CANCELLED"}
+
+    @staticmethod
+    def draw_menu(menu, context):
+        node = bpy.context.active_node
+        if node is None:
+            return
+
+        layout = menu.layout.column()
+        layout.operator_context = "INVOKE_DEFAULT"
+
+        for i, socket in enumerate(node.outputs):
+            if socket_can_become_group_output(socket):
+                props = layout.operator("fn.create_group_output_for_socket", text=socket.name)
+                props.output_index = i
+
+
+class CreateGroupInputForSocket(bpy.types.Operator):
+    bl_idname = "fn.create_group_input_for_socket"
+    bl_label = "Create Group Input for Socket"
+
+    input_index: IntProperty()
+
+    def invoke(self, context, event):
+        tree = context.space_data.node_tree
+        node = context.active_node
+        socket = node.inputs[self.input_index]
+
+        node.select = False
+
+        with skip_syncing():
+            new_node = tree.nodes.new(type="fn_GroupInputNode")
+            new_node.sort_index = 1000
+            new_node.input_name = socket.name
+            update_sort_indices(tree)
+
+            if isinstance(socket, DataSocket):
+                new_node.interface_type = "DATA"
+                new_node.data_type = socket.data_type
+            elif socket.bl_idname == "fn_ExecuteSocket":
+                new_node.interface_type = "EXECUTE"
+            elif socket.bl_idname == "fn_InfluencesSocket":
+                new_node.interface_type = "INFLUENCES"
+            new_node.rebuild()
+
+            new_node.select = True
+            new_node.parent = node.parent
+            new_node.location = node.location
+            new_node.location.x -= 200
+
+            new_node.outputs[0].restore_state(socket.get_state())
+            tree.new_link(new_node.outputs[0], socket)
+
+        tree.sync()
+        bpy.ops.node.translate_attach("INVOKE_DEFAULT")
+        return {"FINISHED"}
+
+
+class CreateGroupOutputForSocket(bpy.types.Operator):
+    bl_idname = "fn.create_group_output_for_socket"
+    bl_label = "Create Group Output for Socket"
+
+    output_index: IntProperty()
+
+    def invoke(self, context, event):
+        tree = context.space_data.node_tree
+        node = context.active_node
+        socket = node.outputs[self.output_index]
+
+        node.select = False
+
+        with skip_syncing():
+            new_node = tree.nodes.new(type="fn_GroupOutputNode")
+            new_node.sort_index = 1000
+            update_sort_indices(tree)
+
+            new_node.output_name = socket.name
+            if isinstance(socket, DataSocket):
+                new_node.interface_type = "DATA"
+                new_node.data_type = socket.data_type
+            elif socket.bl_idname == "fn_ExecuteSocket":
+                new_node.interface_type = "EXECUTE"
+            elif socket.bl_idname == "fn_InfluencesSocket":
+                new_node.interface_type = "INFLUENCES"
+            new_node.rebuild()
+
+            new_node.select = True
+            new_node.parent = node.parent
+            new_node.location = node.location
+            new_node.location.x += 200
+
+            tree.new_link(new_node.inputs[0], socket)
+
+        tree.sync()
+        bpy.ops.node.translate_attach("INVOKE_DEFAULT")
+        return {"FINISHED"}
+
+
+class OpenCloseGroupOperator(bpy.types.Operator):
+    bl_idname = "fn.open_close_group"
+    bl_label = "Open/Close Group"
+    bl_options = {"INTERNAL"}
+
+    @classmethod
+    def poll(cls, context):
+        try: return context.space_data.node_tree.bl_idname == "FunctionTree"
+        except: return False
+
+    def invoke(self, context, event):
+        space_data = context.space_data
+        active_node = context.active_node
+        if isinstance(active_node, GroupNode) and active_node.node_group is not None and active_node.select:
+            space_data.path.append(active_node.node_group, node=active_node)
+        else:
+            space_data.path.pop()
+        return {"FINISHED"}
+
+
+def socket_can_become_group_input(socket):
+    return socket.bl_idname != "fn_OperatorSocket" and not socket.is_linked
+
+def socket_can_become_group_output(socket):
+    return socket.bl_idname != "fn_OperatorSocket"
+
+keymap = None
+
+def register():
+    global keymap
+
+    if not bpy.app.background:
+        keymap = bpy.context.window_manager.keyconfigs.addon.keymaps.new(
+            name="Node Editor", space_type="NODE_EDITOR")
+
+        kmi = keymap.keymap_items.new("wm.call_menu_pie", type="V", value="PRESS")
+        kmi.properties.name = "FN_MT_manage_group_pie"
+
+        keymap.keymap_items.new("fn.open_close_group", type="TAB", value="PRESS")
+
+def unregister():
+    global keymap
+
+    if not bpy.app.background:
+        bpy.context.window_manager.keyconfigs.addon.keymaps.remove(keymap)
+        keymap = None

release/scripts/startup/nodes/function_nodes/list.py

@@ -0,0 +1,69 @@
+import bpy
+from bpy.props import *
+from .. types import type_infos
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+
+class GetListElementNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GetListElementNode"
+    bl_label = "Get List Element"
+
+    active_type: NodeBuilder.DynamicListProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.dynamic_list_input("list", "List", "active_type")
+        builder.fixed_input("index", "Index", "Integer")
+        builder.dynamic_base_input("fallback", "Fallback", "active_type")
+        builder.dynamic_base_output("value", "Value", "active_type")
+
+
+class GetListElementsNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GetListElementsNode"
+    bl_label = "Get List Elements"
+
+    active_type: NodeBuilder.DynamicListProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.dynamic_list_input("list", "List", "active_type")
+        builder.fixed_input("indices", "Indices", "Integer List")
+        builder.dynamic_base_input("fallback", "Fallback", "active_type")
+        builder.dynamic_list_output("values", "Values", "active_type")
+
+
+class ListLengthNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_ListLengthNode"
+    bl_label = "List Length"
+
+    active_type: NodeBuilder.DynamicListProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.dynamic_list_input("list", "List", "active_type")
+        builder.fixed_output("length", "Length", "Integer")
+
+
+class PackListNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_PackListNode"
+    bl_label = "Pack List"
+
+    active_type: StringProperty(
+        default="Float",
+        update=FunctionNode.sync_tree)
+
+    variadic: NodeBuilder.BaseListVariadicProperty()
+
+    def declaration(self, builder):
+        builder.base_list_variadic_input("inputs", "variadic", self.active_type)
+        builder.fixed_output("output", "List", type_infos.to_list(self.active_type))
+
+    def draw_advanced(self, layout):
+        self.invoke_type_selection(layout, "set_type", "Change Type", mode="BASE")
+
+    def set_type(self, data_type):
+        self.active_type = data_type
+
+    @classmethod
+    def get_search_terms(cls):
+        for list_type in type_infos.iter_list_types():
+            base_type = type_infos.to_base(list_type)
+            yield ("Pack " + list_type, {"active_type" : base_type})

release/scripts/startup/nodes/function_nodes/math.py

@@ -0,0 +1,129 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+def create_variadic_math_node(data_type, idname, label):
+    class MathNode(bpy.types.Node, FunctionNode):
+        bl_idname = idname
+        bl_label = label
+
+        variadic: NodeBuilder.BaseListVariadicProperty()
+
+        def declaration(self, builder: NodeBuilder):
+            builder.base_list_variadic_input("inputs", "variadic", data_type)
+
+            if NodeBuilder.BaseListVariadicPropertyHasList(self.variadic):
+                builder.fixed_output("result", "Result", data_type + " List")
+            else:
+                builder.fixed_output("result", "Result", data_type)
+
+    return MathNode
+
+def create_single_type_two_inputs_math_node(data_type, idname, label):
+    return create_two_inputs_math_node(data_type, data_type, data_type, idname, label)
+
+def create_two_inputs_math_node(input_type1, input_type2, output_type, idname, label):
+    class MathNode(bpy.types.Node, FunctionNode):
+        bl_idname = idname
+        bl_label = label
+
+        use_list__a: NodeBuilder.VectorizedProperty()
+        use_list__b: NodeBuilder.VectorizedProperty()
+
+        def declaration(self, builder: NodeBuilder):
+            builder.vectorized_input("a", "use_list__a", "A", "A", input_type1)
+            builder.vectorized_input("b", "use_list__b", "B", "B", input_type2)
+            builder.vectorized_output("result", ["use_list__a", "use_list__b"], "Result", "Result", output_type)
+
+    return MathNode
+
+def create_single_input_math_node(input_type, output_type, idname, label):
+
+    class MathNode(bpy.types.Node, FunctionNode):
+        bl_idname = idname
+        bl_label = label
+
+        use_list: NodeBuilder.VectorizedProperty()
+
+        def declaration(self, builder: NodeBuilder):
+            builder.vectorized_input("input", "use_list", "Value", "Values", input_type)
+            builder.vectorized_output("output", ["use_list"], "Result", "Result", output_type)
+
+    return MathNode
+
+AddFloatsNode = create_variadic_math_node("Float", "fn_AddFloatsNode", "Add Floats")
+MultiplyFloatsNode = create_variadic_math_node("Float", "fn_MultiplyFloatsNode", "Multiply Floats")
+MinimumFloatsNode = create_variadic_math_node("Float", "fn_MinimumFloatsNode", "Minimum Floats")
+MaximumFloatsNode = create_variadic_math_node("Float", "fn_MaximumFloatsNode", "Maximum Floats")
+
+SubtractFloatsNode = create_single_type_two_inputs_math_node("Float", "fn_SubtractFloatsNode", "Subtract Floats")
+DivideFloatsNode = create_single_type_two_inputs_math_node("Float", "fn_DivideFloatsNode", "Divide Floats")
+PowerFloatsNode = create_single_type_two_inputs_math_node("Float", "fn_PowerFloatsNode", "Power Floats")
+
+SqrtFloatNode = create_single_input_math_node("Float", "Float", "fn_SqrtFloatNode", "Sqrt Float")
+AbsFloatNode = create_single_input_math_node("Float", "Float", "fn_AbsoluteFloatNode", "Absolute Float")
+SineFloatNode = create_single_input_math_node("Float", "Float", "fn_SineFloatNode", "Sine")
+CosineFloatNode = create_single_input_math_node("Float", "Float", "fn_CosineFloatNode", "Cosine")
+
+CeilFloatNode = create_single_input_math_node("Float", "Float", "fn_CeilFloatNode", "Ceil Float")
+FloorFloatNode = create_single_input_math_node("Float", "Float", "fn_FloorFloatNode", "Floor Float")
+
+AddVectorsNode = create_variadic_math_node("Vector", "fn_AddVectorsNode", "Add Vectors")
+SubtractVectorsNode = create_single_type_two_inputs_math_node("Vector", "fn_SubtractVectorsNode", "Subtract Vectors")
+MultiplyVectorsNode = create_variadic_math_node("Vector", "fn_MultiplyVectorsNode", "Multiply Vectors")
+DivideVectorsNode = create_single_type_two_inputs_math_node("Vector", "fn_DivideVectorsNode", "Divide Vectors")
+MultiplyVectorWithFloatNode = create_two_inputs_math_node("Vector", "Float", "Vector", "fn_MultiplyVectorWithFloatNode", "Multiply Vector with Float")
+
+VectorCrossProductNode = create_single_type_two_inputs_math_node("Vector", "fn_VectorCrossProductNode", "Cross Product")
+VectorReflectNode = create_single_type_two_inputs_math_node("Vector", "fn_ReflectVectorNode", "Reflect Vector")
+VectorProjectNode = create_single_type_two_inputs_math_node("Vector", "fn_ProjectVectorNode", "Project Vector")
+VectorDotProductNode = create_two_inputs_math_node("Vector", "Vector", "Float", "fn_VectorDotProductNode", "Dot Product")
+VectorDistanceNode = create_two_inputs_math_node("Vector", "Vector", "Float", "fn_VectorDistanceNode", "Vector Distance")
+NormalizeVectorNode = create_single_input_math_node("Vector", "Vector", "fn_NormalizeVectorNode", "Normalize Vector")
+VectorLengthNode = create_single_input_math_node("Vector", "Float", "fn_VectorLengthNode", "Vector Length")
+
+BooleanAndNode = create_variadic_math_node("Boolean", "fn_BooleanAndNode", "And")
+BooleanOrNode = create_variadic_math_node("Boolean", "fn_BooleanOrNode", "Or")
+BooleanNotNode = create_single_input_math_node("Boolean", "Boolean", "fn_BooleanNotNode", "Not")
+
+LessThanFloatNode = create_two_inputs_math_node("Float", "Float", "Boolean", "fn_LessThanFloatNode", "Less Than Float")
+GreaterThanFloatNode = create_two_inputs_math_node("Float", "Float", "Boolean", "fn_GreaterThanFloatNode", "Greater Than Float")
+
+class MapRangeNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_MapRangeNode"
+    bl_label = "Map Range"
+
+    clamp: BoolProperty(
+        name="Clamp",
+        default=True,
+    )
+
+    use_list__value: NodeBuilder.VectorizedProperty()
+    use_list__from_min: NodeBuilder.VectorizedProperty()
+    use_list__from_max: NodeBuilder.VectorizedProperty()
+    use_list__to_min: NodeBuilder.VectorizedProperty()
+    use_list__to_max: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input("value", "use_list__value", "Value", "Values", "Float")
+        builder.vectorized_input("from_min", "use_list__from_min", "From Min", "From Min", "Float")
+        builder.vectorized_input("from_max", "use_list__from_max", "From Max", "From Max", "Float")
+        builder.vectorized_input("to_min", "use_list__to_min", "To Min", "To Min", "Float")
+        builder.vectorized_input("to_max", "use_list__to_max", "To Max", "To Max", "Float")
+        builder.vectorized_output("value", [
+            "use_list__value", "use_list__from_min", "use_list__from_max",
+            "use_list__to_min", "use_list__to_max"], "Value", "Values", "Float")
+
+    def draw(self, layout):
+        layout.prop(self, "clamp")
+
+class FloatClampNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_FloatClampNode"
+    bl_label = "Clamp"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("value", "Value", "Float")
+        builder.fixed_input("min", "Min", "Float", default=0)
+        builder.fixed_input("max", "Max", "Float", default=1)
+        builder.fixed_output("value", "Value", "Float")

release/scripts/startup/nodes/function_nodes/node_instance_identifier.py

@@ -0,0 +1,12 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+
+class NodeInstanceIdentifierNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_NodeInstanceIdentifierNode"
+    bl_label = "Node Instance Identifier"
+
+    def declaration(self, builder):
+        builder.fixed_output("identifier", "Identifier", "Text")

release/scripts/startup/nodes/function_nodes/noise.py

@@ -0,0 +1,143 @@
+import bpy
+import random
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+
+class PerlinNoiseNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_PerlinNoiseNode"
+    bl_label = "Perlin Noise"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("position", "Position", "Vector")
+        builder.fixed_input("amplitude", "Amplitude", "Float", default=1)
+        builder.fixed_input("scale", "Scale", "Float", default=1)
+        builder.fixed_output("noise_1d", "Noise", "Float")
+        builder.fixed_output("noise_3d", "Noise", "Vector")
+
+
+class RandomFloatNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_RandomFloatNode"
+    bl_label = "Random Float"
+
+    node_seed: IntProperty(
+        name="Node Seed",
+    )
+
+    def init_props(self):
+        self.node_seed = new_node_seed()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("min", "Min", "Float", default=0)
+        builder.fixed_input("max", "Max", "Float", default=1)
+        builder.fixed_input("seed", "Seed", "Integer")
+        builder.fixed_output("value", "Value", "Float")
+
+    def draw_advanced(self, layout):
+        layout.prop(self, "node_seed")
+
+    def duplicate(self, src_node):
+        self.node_seed = new_node_seed()
+
+
+class RandomFloatsNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_RandomFloatsNode"
+    bl_label = "Random Floats"
+
+    node_seed: IntProperty(
+        name="Node Seed",
+    )
+
+    def init_props(self):
+        self.node_seed = new_node_seed()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("amount", "Amount", "Integer", default=10)
+        builder.fixed_input("min", "Min", "Float")
+        builder.fixed_input("max", "Max", "Float", default=1)
+        builder.fixed_input("seed", "Seed", "Integer")
+        builder.fixed_output("values", "Values", "Float List")
+
+    def draw_advanced(self, layout):
+        layout.prop(self, "node_seed")
+
+    def duplicate(self, src_node):
+        self.node_seed = new_node_seed()
+
+random_vector_mode_items = [
+    ("UNIFORM_IN_CUBE", "Uniform in Cube", "Generate a vector that is somewhere in the volume of a cube", "NONE", 0),
+    ("UNIFORM_ON_SPHERE", "Uniform on Sphere", "Generate a vector that is somewhere on the surface of a sphere", 1),
+    ("UNIFORM_IN_SPHERE", "Uniform in Sphere", "Generate a vector that is somewhere in the volume of a sphere", 2),
+]
+
+class RandomVectorNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_RandomVectorNode"
+    bl_label = "Random Vector"
+
+    node_seed: IntProperty(
+        name="Node Seed",
+    )
+
+    mode: EnumProperty(
+        name="Mode",
+        items=random_vector_mode_items,
+        default="UNIFORM_IN_CUBE",
+    )
+
+    use_list__factor: NodeBuilder.VectorizedProperty()
+    use_list__seed: NodeBuilder.VectorizedProperty()
+
+    def init_props(self):
+        self.node_seed = new_node_seed()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input("factor", "use_list__factor", "Factor", "Factors", "Vector", default=(1, 1, 1))
+        builder.vectorized_input("seed", "use_list__seed", "Seed", "Seeds", "Integer")
+        builder.vectorized_output("vector", ["use_list__factor", "use_list__seed"], "Vector", "Vectors", "Vector")
+
+    def draw(self, layout):
+        layout.prop(self, "mode", text="")
+
+    def draw_advanced(self, layout):
+        layout.prop(self, "node_seed")
+
+    def duplicate(self, src_node):
+        self.node_seed = new_node_seed()
+
+
+class RandomVectorsNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_RandomVectorsNode"
+    bl_label = "Random Vectors"
+
+    node_seed: IntProperty(
+        name="Node Seed",
+    )
+
+    mode: EnumProperty(
+        name="Mode",
+        items=random_vector_mode_items,
+        default="UNIFORM_IN_CUBE",
+    )
+
+    def init_props(self):
+        self.node_seed = new_node_seed()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("amount", "Amount", "Integer", default=10)
+        builder.fixed_input("factor", "Factor", "Vector", default=(1, 1, 1))
+        builder.fixed_input("seed", "Seed", "Integer")
+        builder.fixed_output("vectors", "Vectors", "Vector List")
+
+    def draw(self, layout):
+        layout.prop(self, "mode", text="")
+
+    def draw_advanced(self, layout):
+        layout.prop(self, "node_seed")
+
+    def duplicate(self, src_node):
+        self.node_seed = new_node_seed()
+
+
+def new_node_seed():
+    return random.randint(0, 10000)

release/scripts/startup/nodes/function_nodes/object_mesh.py

@@ -0,0 +1,113 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+class ObjectMeshNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_ObjectMeshNode"
+    bl_label = "Object Mesh"
+
+    def declaration(self, builder):
+        builder.fixed_input("object", "Object", "Object", display_name=False)
+        builder.fixed_output("vertex_locations", "Vertex Locations", "Vector List")
+
+
+class VertexInfo(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_VertexInfoNode"
+    bl_label = "Vertex Info"
+
+    def declaration(self, builder):
+        builder.fixed_output("position", "Position", "Vector")
+
+
+class ClosestLocationOnObjectNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_ClosestLocationOnObjectNode"
+    bl_label = "Closest Location on Object"
+
+    use_list__object: NodeBuilder.VectorizedProperty()
+    use_list__position: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input("object", "use_list__object", "Object", "Objects", "Object", display_name=False)
+        builder.vectorized_input("position", "use_list__position", "Position", "Positions", "Vector")
+
+        vectorize_props = ["use_list__object", "use_list__position"]
+        builder.vectorized_output("closest_hook", vectorize_props, "Closest Hook", "Closest Hooks", "Surface Hook")
+        builder.vectorized_output("closest_position", vectorize_props, "Closest Position", "Closest Positions", "Vector")
+        builder.vectorized_output("closest_normal", vectorize_props, "Closest Normal", "Closest Normals", "Vector")
+
+
+class GetPositionOnSurfaceNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GetPositionOnSurfaceNode"
+    bl_label = "Get Position on Surface"
+
+    use_list__surface_hook: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input("surface_hook", "use_list__surface_hook", "Surface Hook", "Surface Hooks", "Surface Hook")
+        builder.vectorized_output("position", ["use_list__surface_hook"], "Position", "Positions", "Vector")
+
+
+class GetNormalOnSurfaceNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GetNormalOnSurfaceNode"
+    bl_label = "Get Normal on Surface"
+
+    use_list__surface_hook: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder):
+        builder.vectorized_input("surface_hook", "use_list__surface_hook", "Surface Hook", "Surface Hooks", "Surface Hook")
+        builder.vectorized_output("normal", ["use_list__surface_hook"], "Normal", "Normals", "Vector")
+
+
+class GetWeightOnSurfaceNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GetWeightOnSurfaceNode"
+    bl_label = "Get Weight on Surface"
+
+    use_list__surface_hook: NodeBuilder.VectorizedProperty()
+    use_list__vertex_group_name: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input("surface_hook", "use_list__surface_hook", "Surface Hook", "Surface Hooks", "Surface Hook")
+        builder.vectorized_input("vertex_group_name", "use_list__vertex_group_name", "Name", "Names", "Text",
+            default="Group", display_name=False, display_icon="GROUP_VERTEX")
+        builder.vectorized_output("weight", ["use_list__surface_hook", "use_list__vertex_group_name"], "Weight", "Weights", "Float")
+
+
+class GetImageColorOnSurfaceNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_GetImageColorOnSurfaceNode"
+    bl_label = "Get Image Color on Surface"
+
+    use_list__surface_hook: NodeBuilder.VectorizedProperty()
+    use_list__image: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input("surface_hook", "use_list__surface_hook", "Surface Hook", "Surface Hooks", "Surface Hook")
+        builder.vectorized_input("image", "use_list__image", "Image", "Images", "Image", display_name=False)
+        builder.vectorized_output("color", ["use_list__surface_hook", "use_list__image"], "Color", "Colors", "Color")
+
+
+class SampleObjectSurfaceNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_SampleObjectSurfaceNode"
+    bl_label = "Sample Object Surface"
+
+    weight_mode: EnumProperty(
+        name="Weight Mode",
+        items=[
+            ("UNIFORM", "Uniform", "", "NONE", 0),
+            ("VERTEX_WEIGHTS", "Vertex Weights", "", "NONE", 1),
+        ],
+        default="UNIFORM",
+        update=FunctionNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("object", "Object", "Object", display_name=False)
+        builder.fixed_input("amount", "Amount", "Integer", default=10)
+        builder.fixed_input("seed", "Seed", "Integer")
+        if self.weight_mode == "VERTEX_WEIGHTS":
+            builder.fixed_input("vertex_group_name", "Vertex Group", "Text", default="Group")
+
+        builder.fixed_output("surface_hooks", "Surface Hooks", "Surface Hook List")
+
+    def draw(self, layout):
+        layout.prop(self, "weight_mode", text="")

release/scripts/startup/nodes/function_nodes/object_transforms.py

@@ -0,0 +1,11 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+
+class ObjectTransformsNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_ObjectTransformsNode"
+    bl_label = "Object Transforms"
+
+    def declaration(self, builder):
+        builder.fixed_input("object", "Object", "Object")
+        builder.fixed_output("location", "Location", "Vector")

release/scripts/startup/nodes/function_nodes/switch.py

@@ -0,0 +1,79 @@
+import bpy
+import uuid
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+class SwitchNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_SwitchNode"
+    bl_label = "Switch"
+
+    data_type: StringProperty(
+        default="Float",
+        update=FunctionNode.sync_tree
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("condition", "Condition", "Boolean")
+        builder.fixed_input("true", "True", self.data_type)
+        builder.fixed_input("false", "False", self.data_type)
+        builder.fixed_output("result", "Result", self.data_type)
+
+    def draw(self, layout):
+        self.invoke_type_selection(layout, "set_type", "Change Type")
+
+    def set_type(self, data_type):
+        self.data_type = data_type
+
+
+class SelectNodeItem(bpy.types.PropertyGroup):
+    identifier: StringProperty()
+
+class SelectNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_SelectNode"
+    bl_label = "Select"
+
+    data_type: StringProperty(
+        default="Float",
+        update=FunctionNode.sync_tree,
+    )
+
+    input_items: CollectionProperty(
+        type=SelectNodeItem,
+    )
+
+    def init_props(self):
+        self.add_input()
+        self.add_input()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("select", "Select", "Integer")
+        for i, item in enumerate(self.input_items):
+            builder.fixed_input(item.identifier, str(i), self.data_type)
+        builder.fixed_input("fallback", "Fallback", self.data_type)
+        builder.fixed_output("result", "Result", self.data_type)
+
+    def draw(self, layout):
+        self.invoke_type_selection(layout, "set_type", "Change Type")
+        self.invoke_function(layout, "add_input", "Add Input")
+
+    def draw_socket(self, layout, socket, text, decl, index_in_decl):
+        if len(socket.name) <= 3:
+            index = int(socket.name)
+            row = layout.row(align=True)
+            decl.draw_socket(row, socket, index_in_decl)
+            self.invoke_function(row, "remove_input", "", icon="X", settings=(index, ))
+        else:
+            decl.draw_socket(layout, socket, index_in_decl)
+
+    def set_type(self, data_type):
+        self.data_type = data_type
+
+    def add_input(self):
+        item = self.input_items.add()
+        item.identifier = str(uuid.uuid4())
+        self.sync_tree()
+
+    def remove_input(self, index):
+        self.input_items.remove(index)
+        self.sync_tree()

release/scripts/startup/nodes/function_nodes/text.py

@@ -0,0 +1,20 @@
+import bpy
+from .. node_builder import NodeBuilder
+from .. base import FunctionNode
+
+class TextLengthNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_TextLengthNode"
+    bl_label = "Text Length"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("text", "Text", "Text")
+        builder.fixed_output("length", "Length", "Integer")
+
+
+class JoinTextListNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_JoinTextListNode"
+    bl_label = "Join Text List"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("texts", "Texts", "Text List")
+        builder.fixed_output("text", "Text", "Text")

release/scripts/startup/nodes/function_nodes/time.py

@@ -0,0 +1,10 @@
+import bpy
+from .. node_builder import NodeBuilder
+from .. base import FunctionNode
+
+class TimeInfoNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_TimeInfoNode"
+    bl_label = "Time Info"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_output("frame", "Frame", "Float")

release/scripts/startup/nodes/function_nodes/value.py

@@ -0,0 +1,29 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+
+class ValueNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_ValueNode"
+    bl_label = "Value"
+
+    data_type: StringProperty(
+        name="Data Type",
+        default="Float",
+        update=FunctionNode.sync_tree,
+    )
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_output("value", "Value", self.data_type)
+
+    def draw_socket(self, layout, socket, text, decl, index_in_decl):
+        row = layout.row(align=True)
+        if hasattr(socket, "draw_property"):
+            socket.draw_property(row, self, "")
+        else:
+            row.label(text=text)
+        self.invoke_type_selection(row, "set_type", text="", icon="SETTINGS")
+
+    def set_type(self, data_type):
+        self.data_type = data_type

release/scripts/startup/nodes/function_nodes/vector.py

@@ -0,0 +1,71 @@
+import bpy
+from bpy.props import *
+from .. base import FunctionNode
+from .. node_builder import NodeBuilder
+
+
+class VectorFromValueNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_VectorFromValueNode"
+    bl_label = "Vector from Value"
+
+    use_list__value: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input("value", "use_list__value", "Value", "Values", "Float")
+        builder.vectorized_output("vector", ["use_list__value"], "Vector", "Vectors", "Vector")
+
+
+class CombineVectorNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_CombineVectorNode"
+    bl_label = "Combine Vector"
+
+    use_list__x: NodeBuilder.VectorizedProperty()
+    use_list__y: NodeBuilder.VectorizedProperty()
+    use_list__z: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder):
+        builder.vectorized_input(
+            "x", "use_list__x",
+            "X", "X", "Float")
+        builder.vectorized_input(
+            "y", "use_list__y",
+            "Y", "Y", "Float")
+        builder.vectorized_input(
+            "z", "use_list__z",
+            "Z", "Z", "Float")
+
+        builder.vectorized_output(
+            "vector", ["use_list__x", "use_list__y", "use_list__z"],
+            "Vector", "Vectors", "Vector")
+
+
+class SeparateVectorNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_SeparateVectorNode"
+    bl_label = "Separate Vector"
+
+    use_list__vector: NodeBuilder.VectorizedProperty()
+
+    def declaration(self, builder: NodeBuilder):
+        builder.vectorized_input(
+            "vector", "use_list__vector",
+            "Vector", "Vectors", "Vector")
+
+        builder.vectorized_output(
+            "x", ["use_list__vector"],
+            "X", "X", "Float")
+        builder.vectorized_output(
+            "y", ["use_list__vector"],
+            "Y", "Y", "Float")
+        builder.vectorized_output(
+            "z", ["use_list__vector"],
+            "Z", "Z", "Float")
+
+
+class FindNonClosePointsNode(bpy.types.Node, FunctionNode):
+    bl_idname = "fn_FindNonClosePointsNode"
+    bl_label = "Find Non Close Point"
+
+    def declaration(self, builder: NodeBuilder):
+        builder.fixed_input("points", "Points", "Vector List")
+        builder.fixed_input("min_distance", "Min Distance", "Float", default=0.1)
+        builder.fixed_output("indices", "Indices", "Integer List")

release/scripts/startup/nodes/function_tree.py

@@ -0,0 +1,57 @@
+import bpy
+from collections import namedtuple
+
+from . base import BaseTree, BaseNode
+from . graph import DirectedGraphBuilder, DirectedGraph
+
+class FunctionTree(bpy.types.NodeTree, BaseTree):
+    bl_idname = "FunctionTree"
+    bl_icon = "MOD_DATA_TRANSFER"
+    bl_label = "Function Nodes"
+
+    def get_input_nodes(self):
+        input_nodes = [node for node in self.nodes if node.bl_idname == "fn_GroupInputNode"]
+        sorted_input_nodes = sorted(input_nodes, key=lambda node: (node.sort_index, node.name))
+        return sorted_input_nodes
+
+    def get_output_nodes(self):
+        output_nodes = [node for node in self.nodes if node.bl_idname == "fn_GroupOutputNode"]
+        sorted_output_nodes = sorted(output_nodes, key=lambda node: (node.sort_index, node.name))
+        return sorted_output_nodes
+
+    def get_directly_used_trees(self):
+        trees = set()
+        for node in self.nodes:
+            if isinstance(node, BaseNode):
+                trees.update(node.iter_directly_used_trees())
+        return trees
+
+    def find_callable_trees(self):
+        used_by_trees = FunctionTree.BuildInvertedCallGraph().reachable(self)
+        trees = [tree for tree in bpy.data.node_groups
+                 if isinstance(tree, FunctionTree) and tree not in used_by_trees]
+        return trees
+
+    @staticmethod
+    def BuildTreeCallGraph() -> DirectedGraph:
+        '''
+        Every vertex is a tree.
+        Every edge (A, B) means: Tree A uses tree B.
+        '''
+        builder = DirectedGraphBuilder()
+        for tree in bpy.data.node_groups:
+            if isinstance(tree, FunctionTree):
+                builder.add_vertex(tree)
+                for dependency_tree in tree.get_directly_used_trees():
+                    builder.add_directed_edge(
+                        from_v=tree,
+                        to_v=dependency_tree)
+        return builder.build()
+
+    @staticmethod
+    def BuildInvertedCallGraph() -> DirectedGraph:
+        '''
+        Builds a directed graph in which every tree is a vertex.
+        Every edge (A, B) means: Changes in A might affect B.
+        '''
+        return FunctionTree.BuildTreeCallGraph().inverted()

release/scripts/startup/nodes/graph.py

@@ -0,0 +1,87 @@
+from collections import namedtuple, defaultdict
+
+class DirectedGraph:
+    def __init__(self, V, E):
+        assert all(isinstance(e, tuple) for e in E)
+        assert all(v1 in V and v2 in V for v1, v2 in E)
+        self.V = set(V)
+        self.E = set(E)
+
+        self.outgoing = defaultdict(set)
+        self.incoming = defaultdict(set)
+        self.neighbors = defaultdict(set)
+        for v1, v2 in E:
+            self.outgoing[v1].add(v2)
+            self.incoming[v2].add(v1)
+            self.neighbors[v1].add(v2)
+            self.neighbors[v2].add(v1)
+
+    def inverted(self):
+        return DirectedGraph(self.V, [(v2, v1) for v1, v2 in self.E])
+
+    def reachable(self, start_verts):
+        return self._reachable(start_verts, self.outgoing)
+
+    def reachable_inversed(self, start_verts):
+        return self._reachable(start_verts, self.incoming)
+
+    def connected(self, start_verts):
+        return self._reachable(start_verts, self.neighbors)
+
+    def _reachable(self, start_verts, next_map):
+        if start_verts in self.V:
+            start_verts = (start_verts, )
+        assert all(v in self.V for v in start_verts)
+
+        verts_to_check = set(start_verts)
+        found_verts = set()
+        while len(verts_to_check) > 0:
+            v = verts_to_check.pop()
+            found_verts.add(v)
+            for prev_v in next_map[v]:
+                if prev_v not in found_verts:
+                    verts_to_check.add(prev_v)
+        return found_verts
+
+    def toposort(self):
+        return self.toposort_partial(self.V)
+
+    def toposort_partial(self, verts_to_sort):
+        verts_to_sort = set(verts_to_sort)
+        sorted_verts = list()
+        temp_marked_verts = set()
+        finished_verts = set()
+
+        def visit(v):
+            if v in finished_verts:
+                return
+            if v in temp_marked_verts:
+                raise Exception("not a DAG")
+            temp_marked_verts.add(v)
+            for prev_v in self.incoming[v]:
+                visit(prev_v)
+            finished_verts.add(v)
+            if v in verts_to_sort:
+                sorted_verts.append(v)
+
+        for v in verts_to_sort:
+            visit(v)
+
+        return tuple(sorted_verts)
+
+
+class DirectedGraphBuilder:
+    def __init__(self):
+        self.V = set()
+        self.E = set()
+
+    def add_vertex(self, v):
+        self.V.add(v)
+
+    def add_directed_edge(self, from_v, to_v):
+        self.V.add(from_v)
+        self.V.add(to_v)
+        self.E.add((from_v, to_v))
+
+    def build(self):
+        return DirectedGraph(self.V, self.E)

release/scripts/startup/nodes/inferencing.py

@@ -0,0 +1,291 @@
+from collections import namedtuple, defaultdict
+from . utils.graph import iter_connected_components
+from . types import type_infos
+from . tree_data import TreeData
+
+from . declaration import (
+    FixedSocketDecl,
+    ListSocketDecl,
+    BaseListVariadic,
+    VectorizedInputDecl,
+    VectorizedOutputDecl,
+)
+
+DecisionID = namedtuple("DecisionID", ("node", "prop_name"))
+
+def get_inferencing_decisions(tree_data: TreeData):
+    list_decisions = make_list_decisions(tree_data)
+    vector_decisions = make_vector_decisions(tree_data, list_decisions)
+    base_list_variadic_decisions = make_base_list_variadic_decisions(tree_data, list_decisions, vector_decisions)
+
+    decisions = dict()
+    decisions.update(list_decisions)
+    decisions.update(vector_decisions)
+    decisions.update(base_list_variadic_decisions)
+    return decisions
+
+
+# Inference list type decisions
+#################################################
+
+def make_list_decisions(tree_data):
+    decision_users = get_list_decision_ids_with_users(tree_data)
+    decision_links = get_list_decision_links(tree_data)
+
+    decisions = dict()
+
+    for component in iter_connected_components(decision_users.keys(), decision_links):
+        possible_types = set(iter_possible_list_component_types(
+            component, decision_users, tree_data))
+
+        if len(possible_types) == 1:
+            base_type = next(iter(possible_types))
+            for decision_id in component:
+                decisions[decision_id] = base_type
+
+    return decisions
+
+def get_list_decision_ids_with_users(tree_data):
+    decision_users = defaultdict(lambda: {"BASE": [], "LIST": []})
+
+    for node in tree_data.iter_nodes():
+        for decl, sockets in node.decl_map.iter_decl_with_sockets():
+            if isinstance(decl, ListSocketDecl):
+                decision_id = DecisionID(node, decl.prop_name)
+                decision_users[decision_id][decl.list_or_base].append(sockets[0])
+
+    return decision_users
+
+def get_list_decision_links(tree_data):
+    linked_decisions = defaultdict(set)
+
+    for from_socket, to_socket in tree_data.iter_connections():
+        from_node = tree_data.get_node(from_socket)
+        to_node = tree_data.get_node(to_socket)
+        from_decl = from_socket.get_decl(from_node)
+        to_decl = to_socket.get_decl(to_node)
+        if isinstance(from_decl, ListSocketDecl) and isinstance(to_decl, ListSocketDecl):
+            if from_decl.list_or_base == to_decl.list_or_base:
+                from_decision_id = DecisionID(from_node, from_decl.prop_name)
+                to_decision_id = DecisionID(to_node, to_decl.prop_name)
+                linked_decisions[from_decision_id].add(to_decision_id)
+                linked_decisions[to_decision_id].add(from_decision_id)
+
+    return linked_decisions
+
+def iter_possible_list_component_types(component, decision_users, tree_data):
+    for decision_id in component:
+        for socket in decision_users[decision_id]["LIST"]:
+            for other_node, other_socket in tree_data.iter_connected_sockets_with_nodes(socket):
+                other_decl = other_socket.get_decl(other_node)
+                if data_sockets_are_static(other_decl):
+                    data_type = other_socket.data_type
+                    if type_infos.is_list(data_type):
+                        yield type_infos.to_base(data_type)
+                elif isinstance(other_decl, BaseListVariadic):
+                    yield other_decl.base_type
+                elif isinstance(other_decl, VectorizedInputDecl):
+                    yield other_decl.base_type
+                elif isinstance(other_decl, VectorizedOutputDecl):
+                    yield other_decl.base_type
+        for socket in decision_users[decision_id]["BASE"]:
+            for other_node, other_socket in tree_data.iter_connected_sockets_with_nodes(socket):
+                other_decl = other_socket.get_decl(other_node)
+                if data_sockets_are_static(other_decl):
+                    data_type = other_socket.data_type
+                    if type_infos.is_base(data_type):
+                        yield data_type
+                elif isinstance(other_decl, BaseListVariadic):
+                    yield other_decl.base_type
+                elif isinstance(other_decl, VectorizedInputDecl):
+                    yield other_decl.base_type
+                elif isinstance(other_decl, VectorizedOutputDecl):
+                    yield other_decl.base_type
+
+
+# Inference vectorization decisions
+########################################
+
+def make_vector_decisions(tree_data, list_decisions):
+    graph, input_sockets, output_sockets = get_vector_decisions_graph(tree_data)
+
+    decisions = dict()
+    decision_ids_with_collision = set()
+
+    for initial_decision_id, decision in iter_obligatory_vector_decisions(graph, input_sockets, output_sockets, tree_data, list_decisions):
+        for decision_id in graph.reachable(initial_decision_id):
+            if decision_id in decisions:
+                if decisions[decision_id] != decision:
+                    decision_ids_with_collision.add(decision_id)
+            else:
+                decisions[decision_id] = decision
+
+    for decision_id in graph.V:
+        decisions.setdefault(decision_id, "BASE")
+
+    while len(decision_ids_with_collision) > 0:
+        collision_decision_id = decision_ids_with_collision.pop()
+        connected_decision_ids = graph.connected(collision_decision_id)
+        for decision_id in connected_decision_ids:
+            decisions.pop(decision_id, None)
+            decision_ids_with_collision.discard(decision_id)
+
+    return decisions
+
+def get_vector_decisions_graph(tree_data):
+    '''
+    Builds a directed graph.
+    Vertices in that graph are decision IDs.
+    A directed edge (A, B) means: If A is a list, then B has to be a list.
+    '''
+    from . graph import DirectedGraphBuilder
+    builder = DirectedGraphBuilder()
+    input_sockets = set()
+    output_sockets = set()
+
+    for node in tree_data.iter_nodes():
+        for decl, sockets in node.decl_map.iter_decl_with_sockets():
+            if isinstance(decl, VectorizedInputDecl):
+                decision_id = DecisionID(node, decl.prop_name)
+                builder.add_vertex(decision_id)
+                input_sockets.add(sockets[0])
+            elif isinstance(decl, VectorizedOutputDecl):
+                output_sockets.add(sockets[0])
+
+    for from_socket, to_socket in tree_data.iter_connections():
+        from_node = tree_data.get_node(from_socket)
+        to_node = tree_data.get_node(to_socket)
+
+        from_decl = from_socket.get_decl(from_node)
+        to_decl = to_socket.get_decl(to_node)
+
+        if isinstance(from_decl, VectorizedOutputDecl) and isinstance(to_decl, VectorizedInputDecl):
+            for prop_name in from_decl.input_prop_names:
+                from_decision_id = DecisionID(from_node, prop_name)
+                to_decision_id = DecisionID(to_node, to_decl.prop_name)
+                builder.add_directed_edge(from_decision_id, to_decision_id)
+
+    return builder.build(), input_sockets, output_sockets
+
+def iter_obligatory_vector_decisions(graph, input_sockets, output_sockets, tree_data, list_decisions):
+    for socket in input_sockets:
+        other_node, other_socket = tree_data.try_get_origin_with_node(socket)
+        if other_node is None:
+            continue
+
+        node = tree_data.get_node(socket)
+        decl = socket.get_decl(node)
+        decision_id = DecisionID(node, decl.prop_name)
+
+        other_decl = other_socket.get_decl(other_node)
+        if data_sockets_are_static(other_decl):
+            other_data_type = other_socket.data_type
+            if type_infos.is_list(other_data_type) and type_infos.is_link_allowed(other_data_type, decl.list_type):
+                yield decision_id, "LIST"
+        elif isinstance(other_decl, ListSocketDecl):
+            if other_decl.list_or_base == "LIST":
+                list_decision_id = DecisionID(other_node, other_decl.prop_name)
+                if list_decision_id in list_decisions:
+                    other_base_type = list_decisions[list_decision_id]
+                    if type_infos.is_link_allowed(other_base_type, decl.base_type):
+                        yield decision_id, "LIST"
+                else:
+                    old_data_type = other_socket.data_type
+                    if type_infos.is_link_allowed(old_data_type, decl.list_type):
+                        yield decision_id, "LIST"
+
+    for socket in output_sockets:
+        node = tree_data.get_node(socket)
+        decl = socket.get_decl(node)
+        decision_ids = [DecisionID(node, p) for p in decl.input_prop_names]
+
+        for other_node, other_socket in tree_data.iter_connected_sockets_with_nodes(socket):
+            other_decl = other_socket.get_decl(other_node)
+            if data_sockets_are_static(other_decl):
+                other_data_type = other_socket.data_type
+                if type_infos.is_base(other_data_type) and type_infos.is_link_allowed(other_data_type, decl.base_type):
+                    for decision_id in decision_ids:
+                        yield decision_id, "BASE"
+            elif isinstance(other_decl, ListSocketDecl):
+                if other_decl.list_or_base == "BASE":
+                    list_decision_id = DecisionID(other_node, other_decl.prop_name)
+                    if list_decision_id in list_decisions:
+                        other_base_type = list_decisions[list_decision_id]
+                        if type_infos.is_link_allowed(decl.base_type, other_base_type):
+                            for decision_id in decision_ids:
+                                yield decision_id, "BASE"
+                    else:
+                        old_data_type = other_socket.data_type
+                        if type_infos.is_link_allowed(decl.base_type, old_data_type):
+                            for decision_id in decision_ids:
+                                yield decision_id, "BASE"
+
+
+# Inference pack list decisions
+########################################
+
+def make_base_list_variadic_decisions(tree_data, list_decisions, vector_decisions):
+    decisions = dict()
+
+    for decision_id, decl, socket in iter_base_list_variadic_sockets(tree_data):
+        assert not socket.is_output
+
+        origin_node, origin_socket = tree_data.try_get_origin_with_node(socket)
+        if origin_socket is None:
+            decisions[decision_id] = "BASE"
+            continue
+
+        origin_decl = origin_socket.get_decl(origin_node)
+        if data_sockets_are_static(origin_decl):
+            data_type = origin_socket.data_type
+            if type_infos.is_link_allowed(data_type, decl.base_type):
+                decisions[decision_id] = "BASE"
+            elif type_infos.is_link_allowed(data_type, decl.list_type):
+                decisions[decision_id] = "LIST"
+            else:
+                decisions[decision_id] = "BASE"
+        elif isinstance(origin_decl, ListSocketDecl):
+            list_decision_id = DecisionID(origin_node, origin_decl.prop_name)
+            if list_decision_id in list_decisions:
+                other_base_type = list_decisions[list_decision_id]
+                if type_infos.is_link_allowed(other_base_type, decl.base_type):
+                    decisions[decision_id] = origin_decl.list_or_base
+                else:
+                    decisions[decision_id] = "BASE"
+            else:
+                old_origin_type = origin_socket.data_type
+                if type_infos.is_link_allowed(old_origin_type, decl.base_type):
+                    decisions[decision_id] = "BASE"
+                elif type_infos.is_link_allowed(old_origin_type, decl.list_type):
+                    decisions[decision_id] = "LIST"
+                else:
+                    decisions[decision_id] = "BASE"
+        elif isinstance(origin_decl, VectorizedOutputDecl):
+            other_base_type = origin_decl.base_type
+            if type_infos.is_link_allowed(other_base_type, decl.base_type):
+                for input_prop_name in origin_decl.input_prop_names:
+                    input_decision_id = DecisionID(origin_node, input_prop_name)
+                    if input_decision_id in vector_decisions:
+                        if vector_decisions[input_decision_id] == "LIST":
+                            decisions[decision_id] = "LIST"
+                            break
+                else:
+                    decisions[decision_id] = "BASE"
+            else:
+                decisions[decision_id] = "BASE"
+        else:
+            decisions[decision_id] = "BASE"
+
+    return decisions
+
+def data_sockets_are_static(decl):
+    return isinstance(decl, FixedSocketDecl)
+
+def iter_base_list_variadic_sockets(tree_data):
+    for node in tree_data.iter_nodes():
+        for decl, sockets in node.decl_map.iter_decl_with_sockets():
+            if isinstance(decl, BaseListVariadic):
+                collection = decl.get_collection()
+                for i, socket in enumerate(sockets[:-1]):
+                    decision_id = DecisionID(node, f"{decl.prop_name}[{i}].state")
+                    yield decision_id, decl, socket

release/scripts/startup/nodes/keymap.py

@@ -0,0 +1,16 @@
+import bpy
+
+def register():
+    wm = bpy.context.window_manager
+    if wm.keyconfigs.addon is None:
+        return
+
+    km = wm.keyconfigs.addon.keymaps.new(
+        name="Node Editor",
+        space_type='NODE_EDITOR')
+
+    km.keymap_items.new(
+        "fn.node_search",
+        type='A',
+        value='PRESS',
+        ctrl=True)

release/scripts/startup/nodes/menu.py

@@ -0,0 +1,95 @@
+import bpy
+from . function_tree import FunctionTree
+
+def draw_menu(self, context):
+    tree = context.space_data.node_tree
+    if not isinstance(tree, FunctionTree):
+        return
+
+    layout = self.layout
+    layout.operator_context = 'INVOKE_DEFAULT'
+
+    layout.operator("fn.node_search", text="Search", icon='VIEWZOOM')
+    layout.separator()
+    layout.menu("FN_MT_function_nodes_menu", text="Function Nodes")
+    layout.separator()
+    insert_node(layout, "fn_ParticleSystemNode", "Particle System")
+    layout.menu("BP_MT_influences_nodes_menu", text="Influences")
+    layout.menu("BP_MT_action_nodes_menu", text="Actions")
+
+class FunctionNodesMenu(bpy.types.Menu):
+    bl_idname = "FN_MT_function_nodes_menu"
+    bl_label = "Function Nodes Menu"
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator_context = 'INVOKE_DEFAULT'
+
+        insert_node(layout, "fn_SwitchNode", "Switch")
+        layout.separator()
+        insert_node(layout, "fn_FloatRangeNode", "Float Range")
+        layout.separator()
+        insert_node(layout, "fn_CombineVectorNode", "Combine Vector")
+        insert_node(layout, "fn_SeparateVectorNode", "Separate Vector")
+        insert_node(layout, "fn_VectorDistanceNode", "Vector Distance")
+        layout.separator()
+        insert_node(layout, "fn_SeparateColorNode", "Separate Color")
+        insert_node(layout, "fn_CombineColorNode", "Combine Color")
+        layout.separator()
+        insert_node(layout, "fn_GetListElementNode", "Get List Element")
+        insert_node(layout, "fn_ListLengthNode", "List Length")
+        insert_node(layout, "fn_PackListNode", "Pack List")
+        layout.separator()
+        insert_node(layout, "fn_ObjectMeshNode", "Object Mesh")
+        insert_node(layout, "fn_ObjectTransformsNode", "Object Transforms")
+        insert_node(layout, "fn_TextLengthNode", "Text Length")
+
+class InfluencesNodesMenu(bpy.types.Menu):
+    bl_idname = "BP_MT_influences_nodes_menu"
+    bl_label = "Influences Nodes Menu"
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator_context = 'INVOKE_DEFAULT'
+
+        insert_node(layout, "fn_CombineInfluencesNode", "Combine Influences")
+        layout.separator()
+        insert_node(layout, "fn_InitialGridEmitterNode", "Initial Grid Emitter")
+        insert_node(layout, "fn_MeshEmitterNode", "Mesh Emitter")
+        insert_node(layout, "fn_PointEmitterNode", "Point Emitter")
+        layout.separator()
+        insert_node(layout, "fn_AgeReachedEventNode", "Age Reached Event")
+        insert_node(layout, "fn_MeshCollisionEventNode", "Mesh Collision Event")
+        insert_node(layout, "fn_CustomEventNode", "Custom Event")
+        layout.separator()
+        insert_node(layout, "fn_ForceNode", "Force")
+        layout.separator()
+        insert_node(layout, "fn_SizeOverTimeNode", "Size Over Time")
+        insert_node(layout, "fn_ParticleTrailsNode", "Trails")
+        insert_node(layout, "fn_AlwaysExecuteNode", "Always Execute")
+
+
+class ActionNodesMenu(bpy.types.Menu):
+    bl_idname = "BP_MT_action_nodes_menu"
+    bl_label = "Action Nodes Menu"
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator_context = 'INVOKE_DEFAULT'
+
+        insert_node(layout, "fn_ParticleConditionNode", "Condition")
+
+
+def insert_node(layout, type, text, settings = {}, icon = "NONE"):
+    operator = layout.operator("node.add_node", text = text, icon = icon)
+    operator.type = type
+    operator.use_transform = True
+    for name, value in settings.items():
+        item = operator.settings.add()
+        item.name = name
+        item.value = value
+    return operator
+
+
+def register():
+    bpy.types.NODE_MT_add.append(draw_menu)

release/scripts/startup/nodes/node_builder.py

@@ -0,0 +1,240 @@
+from . declaration import (
+    FixedSocketDecl,
+    ListSocketDecl,
+    BaseListVariadic,
+    VectorizedInputDecl,
+    VectorizedOutputDecl,
+    InfluencesSocketDecl,
+    ExecuteOutputDecl,
+    ExecuteInputListDecl,
+    ExecuteInputDecl,
+
+    NoDefaultValue,
+)
+
+class NodeBuilder:
+    def __init__(self, node):
+        self.node = node
+        self.input_declarations = []
+        self.output_declarations = []
+        self._background_color = None
+
+    def _add_input(self, decl):
+        self.input_declarations.append(decl)
+
+    def _add_output(self, decl):
+        self.output_declarations.append(decl)
+
+    def initialize_decls(self):
+        for decl in self.input_declarations:
+            decl.init()
+
+        for decl in self.output_declarations:
+            decl.init()
+
+    def build(self):
+        from . sync import skip_syncing
+        with skip_syncing():
+            self.node.inputs.clear()
+            self.node.outputs.clear()
+
+            for decl in self.input_declarations:
+                sockets = decl.build(self.node.inputs)
+                assert len(sockets) == decl.amount()
+                decl.init_default(sockets)
+
+            for decl in self.output_declarations:
+                sockets = decl.build(self.node.outputs)
+                assert len(sockets) == decl.amount()
+                decl.init_default(sockets)
+
+            if self._background_color is not None:
+                self.node.use_custom_color = True
+                self.node.color = self._background_color
+
+    def get_sockets_decl_map(self):
+        return SocketDeclMap(
+            self.node,
+            self.input_declarations,
+            self.output_declarations)
+
+    def matches_sockets(self):
+        if not self._declarations_matches_sockets(self.input_declarations, self.node.inputs):
+            return False
+        if not self._declarations_matches_sockets(self.output_declarations, self.node.outputs):
+            return False
+        return True
+
+    def _declarations_matches_sockets(self, declarations, all_sockets):
+        sockets_iter = iter(all_sockets)
+        for decl in declarations:
+            amount = decl.amount()
+            try: sockets = [next(sockets_iter) for _ in range(amount)]
+            except StopIteration: return False
+            if not decl.validate(sockets):
+                return False
+        if len(tuple(sockets_iter)) > 0:
+            return False
+        return True
+
+    # General Node Properties
+    ###################################
+
+    def background_color(self, color):
+        assert len(color) == 3
+        self._background_color = color
+
+
+    # Fixed Data Types
+    ###################################
+
+    def fixed_input(self, identifier, name, data_type,
+                    *, default=NoDefaultValue, **kwargs):
+        decl = FixedSocketDecl(self.node, identifier, name, data_type, default, kwargs)
+        self._add_input(decl)
+
+    def fixed_output(self, identifier, name, data_type,
+                     *, default=NoDefaultValue, **kwargs):
+        decl = FixedSocketDecl(self.node, identifier, name, data_type, default, kwargs)
+        self._add_output(decl)
+
+    def fixed_pass_through(self, identifier, name, data_type, *, default=NoDefaultValue):
+        self.fixed_input(identifier, name, data_type, default=default)
+        self.fixed_output(identifier, name, data_type, default=default)
+
+
+    # Packed List
+    ###################################
+
+    @staticmethod
+    def BaseListVariadicProperty():
+        return BaseListVariadic.Property()
+
+    @staticmethod
+    def BaseListVariadicPropertyHasList(prop):
+        return any(v.state == "LIST" for v in prop)
+
+
+    def base_list_variadic_input(self, identifier, prop_name, base_type, default_amount=2):
+        decl = BaseListVariadic(self.node, identifier, prop_name, base_type, default_amount)
+        self._add_input(decl)
+
+
+    # Dynamic List
+    ###################################
+
+    @staticmethod
+    def DynamicListProperty():
+        return ListSocketDecl.Property()
+
+    def dynamic_list_input(self, identifier, name, prop_name):
+        decl = ListSocketDecl(self.node, identifier, name, prop_name, "LIST")
+        self._add_input(decl)
+
+    def dynamic_list_output(self, identifier, name, prop_name):
+        decl = ListSocketDecl(self.node, identifier, name, prop_name, "LIST")
+        self._add_output(decl)
+
+    def dynamic_base_input(self, identifier, name, prop_name):
+        decl = ListSocketDecl(self.node, identifier, name, prop_name, "BASE")
+        self._add_input(decl)
+
+    def dynamic_base_output(self, identifier, name, prop_name):
+        decl = ListSocketDecl(self.node, identifier, name, prop_name, "BASE")
+        self._add_output(decl)
+
+
+    # Vectorized
+    ##################################
+
+    @staticmethod
+    def VectorizedProperty():
+        return VectorizedInputDecl.Property()
+
+    def vectorized_input(self, identifier, prop_name, base_name, list_name, base_type,
+                         *, default=NoDefaultValue, **kwargs):
+        decl = VectorizedInputDecl(
+            self.node, identifier, prop_name,
+            base_name, list_name, base_type,
+            default, kwargs)
+        self._add_input(decl)
+
+    def vectorized_output(self, identifier, input_prop_names, base_name, list_name, base_type,
+                          **kwargs):
+        decl = VectorizedOutputDecl(
+            self.node, identifier, input_prop_names,
+            base_name, list_name, base_type, kwargs)
+        self._add_output(decl)
+
+
+    # BParticles
+    ###################################
+
+    def influences_input(self, identifier, name):
+        decl = InfluencesSocketDecl(self.node, identifier, name)
+        self._add_input(decl)
+
+    def influences_output(self, identifier, name):
+        decl = InfluencesSocketDecl(self.node, identifier, name)
+        self._add_output(decl)
+
+    @staticmethod
+    def ExecuteInputProperty():
+        return ExecuteInputListDecl.Property()
+
+    def execute_input(self, identifier, display_name, prop_name):
+        decl = ExecuteInputListDecl(self.node, identifier, prop_name, display_name)
+        self._add_input(decl)
+
+    def single_execute_input(self, identifier, name):
+        decl = ExecuteInputDecl(self.node, identifier, name)
+        self._add_input(decl)
+
+    def execute_output(self, identifier, name):
+        decl = ExecuteOutputDecl(self.node, identifier, name)
+        self._add_output(decl)
+
+
+
+class SocketDeclMap:
+    def __init__(self, node, input_declarations, output_declarations):
+        self.node = node
+        self._sockets_by_decl = dict()
+        self._decl_by_socket = dict()
+        self._socket_index_in_decl = dict()
+
+        for decl, sockets in iter_sockets_by_decl(node.inputs, input_declarations):
+            self._sockets_by_decl[decl] = sockets
+            for i, socket in enumerate(sockets):
+                self._decl_by_socket[socket] = decl
+                self._socket_index_in_decl[socket] = i
+
+        for decl, sockets in iter_sockets_by_decl(node.outputs, output_declarations):
+            self._sockets_by_decl[decl] = sockets
+            for i, socket in enumerate(sockets):
+                self._decl_by_socket[socket] = decl
+                self._socket_index_in_decl[socket] = i
+
+    def get_decl_by_socket(self, socket):
+        return self._decl_by_socket[socket]
+
+    def get_socket_index_in_decl(self, socket):
+        return self._socket_index_in_decl[socket]
+
+    def get_sockets_by_decl(self, decl):
+        return self._sockets_by_decl[decl]
+
+    def iter_decl_with_sockets(self):
+        yield from self._sockets_by_decl.items()
+
+    def iter_decls(self):
+        yield from self._sockets_by_decl.keys()
+
+
+def iter_sockets_by_decl(node_sockets, declarations):
+    node_sockets_iter = iter(node_sockets)
+    for decl in declarations:
+        amount = decl.amount()
+        sockets_of_decl = tuple(next(node_sockets_iter) for _ in range(amount))
+        assert decl.validate(sockets_of_decl)
+        yield decl, sockets_of_decl

release/scripts/startup/nodes/node_operators.py

@@ -0,0 +1,151 @@
+import bpy
+from bpy.props import *
+from . types import type_infos
+from . function_tree import FunctionTree
+
+def try_find_node(tree_name, node_name):
+    tree = bpy.data.node_groups.get(tree_name)
+    if tree is not None:
+        return tree.nodes.get(node_name)
+    return None
+
+class NodeOperatorBase:
+    tree_name: StringProperty()
+    node_name: StringProperty()
+    function_name: StringProperty()
+    settings_repr: StringProperty()
+
+    def call(self, *args):
+        node = try_find_node(self.tree_name, self.node_name)
+        if node is None:
+            return {'CANCELLED'}
+
+        function = getattr(node, self.function_name)
+        settings = eval(self.settings_repr)
+        function(*args, *settings)
+        return {'FINISHED'}
+
+class NodeOperator(bpy.types.Operator, NodeOperatorBase):
+    bl_idname = "fn.node_operator"
+    bl_label = "Generic Node Operator"
+    bl_options = {'INTERNAL'}
+
+    def execute(self, context):
+        return self.call()
+
+class NodeDataTypeSelector(bpy.types.Operator, NodeOperatorBase):
+    bl_idname = "fn.node_data_type_selector"
+    bl_label = "Generic Node Data Type Selector"
+    bl_options = {'INTERNAL'}
+    bl_property = "item"
+
+    mode: EnumProperty(
+        items=[
+            ("ALL", "All", ""),
+            ("BASE", "Base", ""),
+        ])
+
+    def get_items(self, context):
+        if self.mode == "ALL":
+            return type_infos.get_data_type_items()
+        elif self.mode == "BASE":
+            return type_infos.get_base_type_items()
+        else:
+            assert False
+
+    item: EnumProperty(items=get_items)
+
+    def invoke(self, context, event):
+        context.window_manager.invoke_search_popup(self)
+        return {'CANCELLED'}
+
+    def execute(self, context):
+        return self.call(self.item)
+
+class NodeGroupSelector(bpy.types.Operator, NodeOperatorBase):
+    bl_idname = "fn.node_group_selector"
+    bl_label = "Node Group Selector"
+    bl_options = {'INTERNAL'}
+    bl_property = "item"
+
+    def get_items(self, context):
+        tree = bpy.data.node_groups.get(self.tree_name)
+        possible_trees = tree.find_callable_trees()
+
+        items = []
+        for tree in possible_trees:
+            items.append((tree.name, tree.name, ""))
+        items.append(("NONE", "None", ""))
+        return items
+
+    item: EnumProperty(items=get_items)
+
+    def invoke(self, context, event):
+        context.window_manager.invoke_search_popup(self)
+        return {'CANCELLED'}
+
+    def execute(self, context):
+        if self.item == "NONE":
+            return self.call(None)
+        else:
+            return self.call(bpy.data.node_groups.get(self.item))
+
+class MoveViewToNode(bpy.types.Operator):
+    bl_idname = "fn.move_view_to_node"
+    bl_label = "Move View to Node"
+    bl_options = {'INTERNAL'}
+
+    tree_name: StringProperty()
+    node_name: StringProperty()
+
+    def execute(self, context):
+        target_node = try_find_node(self.tree_name, self.node_name)
+        if target_node is None:
+            return {'CANCELLED'}
+
+        tree = target_node.tree
+        context.space_data.node_tree = tree
+        for node in tree.nodes:
+            node.select = False
+
+        target_node.select = True
+        tree.nodes.active = target_node
+
+        bpy.ops.node.view_selected('INVOKE_DEFAULT')
+        return {'FINISHED'}
+
+def new_function_tree(name, inputs, outputs):
+    tree = bpy.data.node_groups.new(name, "FunctionTree")
+
+    for i, (data_type, input_name) in enumerate(inputs):
+        input_node = tree.nodes.new("fn_GroupInputNode")
+        input_node.sort_index = i
+        input_node.interface_type = "DATA"
+        input_node.input_name = input_name
+        input_node.data_type = data_type
+        input_node.location = (-200, -i * 130)
+
+    for i, (data_type, output_name) in enumerate(outputs):
+        output_node = tree.nodes.new("fn_GroupOutputNode")
+        output_node.sort_index = i
+        output_node.output_name = output_name
+        output_node.data_type = data_type
+        output_node.location = (200, -i * 130)
+
+    tree.sync()
+    return tree
+
+class NewParticleSystem(bpy.types.Operator):
+    bl_idname = "fn.new_particle_system"
+    bl_label = "New Particle System"
+
+    def execute(self, context):
+        mesh = bpy.data.meshes.new("Particle Simulation")
+        ob = bpy.data.objects.new("Particle Simulation", mesh)
+        modifier = ob.modifiers.new("BParticles", 'BPARTICLES')
+
+        bpy.ops.fn.new_particle_simulation_tree(object_name=ob.name, modifier_name=modifier.name)
+
+        context.collection.objects.link(ob)
+
+        return {'FINISHED'}

release/scripts/startup/nodes/problems.py

@@ -0,0 +1,34 @@
+import bpy
+from bpy.props import *
+from . ui import NodeSidebarPanel
+
+warnings = []
+
+def report_warning(node, msg):
+    warnings.append((node, msg))
+
+class ProblemsPanel(bpy.types.Panel, NodeSidebarPanel):
+    bl_idname = "FN_PT_problems"
+    bl_label = "Problems"
+
+    def draw(self, context):
+        layout = self.layout
+        for i, (node, msg) in enumerate(warnings):
+            row = layout.row(align=True)
+            row.label(text=msg)
+            props = row.operator("fn.move_view_to_node", text="Find")
+            props.tree_name = node.tree.name
+            props.node_name = node.name
+            props = row.operator("fn.remove_warning", text="", icon='X')
+            props.index = i
+
+class RemoveWarning(bpy.types.Operator):
+    bl_idname = "fn.remove_warning"
+    bl_label = "Remove Warning"
+    bl_options = {'INTERNAL'}
+
+    index: IntProperty()
+
+    def execute(self, context):
+        del warnings[self.index]
+        return {'FINISHED'}

release/scripts/startup/nodes/search.py

@@ -0,0 +1,94 @@
+import os
+import bpy
+from bpy.props import *
+from pathlib import Path
+from . base import BaseNode
+from . utils.enum_items_cache import cache_enum_items
+from functools import lru_cache
+
+@lru_cache()
+def get_node_group_names_in_file(path: str):
+    with bpy.data.libraries.load(path) as (data_from, data_to):
+        return list(data_from.node_groups)
+
+class NodeSearch(bpy.types.Operator):
+    bl_idname = "fn.node_search"
+    bl_label = "Node Search"
+    bl_options = {'REGISTER', 'UNDO'}
+    bl_property = "item"
+
+    def get_search_items(self, context):
+        items = []
+        tree = context.space_data.edit_tree
+        for node_cls in BaseNode.iter_final_subclasses():
+            for search_term, settings in node_cls.get_search_terms():
+                item = encode_search_item(("BUILTIN", node_cls.bl_idname, settings), search_term)
+                items.append(item)
+
+        current_tree = context.space_data.node_tree
+        for tree in current_tree.find_callable_trees():
+            item = encode_search_item(("EXISTING_GROUP", tree.name), tree.name + " (G)")
+            items.append(item)
+
+        nodelibdir = context.preferences.filepaths.nodelib_directory
+        if len(nodelibdir) > 0 and os.path.exists(nodelibdir):
+            local_group_names = set(tree.name for tree in bpy.data.node_groups)
+            for path in Path(nodelibdir).glob("**/*.blend"):
+                if not path.is_file():
+                    continue
+                for group_name in get_node_group_names_in_file(str(path)):
+                    if group_name not in local_group_names:
+                        item = encode_search_item(("LIB_GROUP", str(path), group_name), group_name + " (G)")
+                        items.append(item)
+
+        sorted_items = list(sorted(items, key=lambda item: item[1]))
+        return sorted_items
+
+    item: EnumProperty(items=cache_enum_items(get_search_items))
+
+    @classmethod
+    def poll(cls, context):
+        try: return context.space_data.node_tree.bl_idname == "FunctionTree"
+        except: return False
+
+    def invoke(self, context, event):
+        context.window_manager.invoke_search_popup(self)
+        return {'CANCELLED'}
+
+    def execute(self, context):
+        tree = context.space_data.node_tree
+        for node in tree.nodes:
+            node.select = False
+
+        item_data = decode_search_item(self.item)
+        item_type = item_data[0]
+
+        if item_type == "BUILTIN":
+            idname, settings = item_data[1:]
+            bpy.ops.node.add_node('INVOKE_DEFAULT', type=idname)
+            new_node = context.active_node
+            for key, value in settings.items():
+                setattr(new_node, key, value)
+        elif item_type == "EXISTING_GROUP":
+            group_name = item_data[1]
+            bpy.ops.node.add_node('INVOKE_DEFAULT', type="fn_GroupNode")
+            new_node = context.active_node
+            new_node.node_group = bpy.data.node_groups[group_name]
+        elif item_type == "LIB_GROUP":
+            path, group_name = item_data[1:]
+            bpy.ops.node.add_node('INVOKE_DEFAULT', type="fn_GroupNode")
+            new_node = context.active_node
+            with bpy.data.libraries.load(path, link=True) as (data_from, data_to):
+                data_to.node_groups = [group_name]
+            new_node.node_group = bpy.data.node_groups[group_name]
+
+        bpy.ops.node.translate_attach("INVOKE_DEFAULT")
+        return {'FINISHED'}
+
+
+def encode_search_item(data, search_term):
+    identifier = repr(data)
+    return (identifier, search_term, "")
+
+def decode_search_item(identifier):
+    return eval(identifier)

release/scripts/startup/nodes/sockets.py

@@ -0,0 +1,228 @@
+import bpy
+from . base import DataSocket, BaseSocket
+from bpy.props import *
+
+class OperatorSocket(bpy.types.NodeSocket, BaseSocket):
+    bl_idname = "fn_OperatorSocket"
+    bl_label = "Operator Socket"
+
+    def draw_color(self, context, node):
+        return (0, 0, 0, 0)
+
+class FloatSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_FloatSocket"
+    bl_label = "Float Socket"
+    data_type = "Float"
+    color = (0, 0.3, 0.5, 1)
+
+    value: FloatProperty(
+        name="Value",
+        default=0.0,
+    )
+
+    def draw_property(self, layout, node, text):
+        layout.prop(self, "value", text=text)
+
+    def get_state(self):
+        return self.value
+
+    def restore_state(self, state):
+        self.value = state
+
+class IntegerSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_IntegerSocket"
+    bl_label = "Integer Socket"
+    data_type = "Integer"
+    color = (0.3, 0.7, 0.5, 1)
+
+    value: IntProperty(
+        name="Value",
+        default=0,
+    )
+
+    def draw_property(self, layout, node, text):
+        layout.prop(self, "value", text=text)
+
+    def get_state(self):
+        return self.value
+
+    def restore_state(self, state):
+        self.value = state
+
+class VectorSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_VectorSocket"
+    bl_label = "Vector Socket"
+    data_type = "Vector"
+    color = (0, 0, 0.5, 1)
+
+    value: FloatVectorProperty(
+        name="Value",
+        size=3,
+        default=(0.0, 0.0, 0.0),
+    )
+
+    def draw_property(self, layout, node, text):
+        layout.column().prop(self, "value", text=text)
+
+    def get_state(self):
+        return tuple(self.value)
+
+    def restore_state(self, state):
+        self.value = state
+
+class BooleanSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_BooleanSocket"
+    bl_label = "Boolean Socket"
+    data_type = "Boolean"
+    color = (0.3, 0.3, 0.3, 1)
+
+    value: BoolProperty(
+        name="Value",
+        default=False,
+    )
+
+    def draw_property(self, layout, node, text):
+        layout.prop(self, "value", text=text)
+
+    def get_state(self):
+        return self.value
+
+    def restore_state(self, state):
+        self.value = state
+
+class ObjectSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_ObjectSocket"
+    bl_label = "Object Socket"
+    data_type = "Object"
+    color = (0, 0, 0, 1)
+
+    value: PointerProperty(
+        name="Value",
+        type=bpy.types.Object,
+    )
+
+    display_name: BoolProperty(default=True)
+
+    def draw_property(self, layout, node, text):
+        if not self.display_name:
+            text = ""
+        layout.prop(self, "value", text=text)
+
+    def get_state(self):
+        return self.value
+
+    def restore_state(self, state):
+        self.value = state
+
+class ImageSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_ImageSocket"
+    bl_label = "Image Socket"
+    data_type = "Image"
+    color = (0.6, 0.6, 0.6, 1)
+
+    value: PointerProperty(
+        name="Value",
+        type=bpy.types.Image,
+    )
+
+    display_name: BoolProperty()
+
+    def draw_property(self, layout, node, text):
+        if not self.display_name:
+            text = ""
+        layout.prop(self, "value", text=text)
+
+    def get_state(self):
+        return self.value
+
+    def restore_state(self, state):
+        self.value = state
+
+class ColorSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_ColorSocket"
+    bl_label = "Color Socket"
+    data_type = "Color"
+    color = (0.8, 0.8, 0.2, 1)
+
+    value: FloatVectorProperty(
+        name="Value",
+        size=4,
+        default=(0.8, 0.8, 0.8, 1.0),
+        subtype='COLOR',
+        soft_min=0.0,
+        soft_max=0.0,
+    )
+
+    def draw_property(self, layout, node, text):
+        layout.prop(self, "value", text=text)
+
+    def get_state(self):
+        return tuple(self.value)
+
+    def restore_state(self, state):
+        self.value = state
+
+class TextSocket(bpy.types.NodeSocket, DataSocket):
+    bl_idname = "fn_TextSocket"
+    bl_label = "Text Socket"
+    data_type = "Text"
+    color = (0.8, 0.8, 0.8, 1)
+
+    value: StringProperty(
+        name="Value",
+        default="",
+    )
+
+    display_name: BoolProperty(default=True)
+    display_icon: StringProperty(default="NONE")
+
+    def draw_property(self, layout, node, text):
+        if not self.display_name:
+            text = ""
+        layout.prop(self, "value", text=text, icon=self.display_icon)
+
+    def get_state(self):
+        return self.value
+
+    def restore_state(self, state):
+        self.value = state
+
+def create_simple_data_socket(idname, data_type, color):
+    return type(idname, (bpy.types.NodeSocket, DataSocket),
+        {
+            "bl_idname" : idname,
+            "bl_label" : idname,
+            "data_type" : data_type,
+            "color" : color,
+        })
+
+FloatListSocket = create_simple_data_socket(
+    "fn_FloatListSocket", "Float List", (0, 0.3, 0.5, 0.5))
+VectorListSocket = create_simple_data_socket(
+    "fn_VectorListSocket", "Vector List", (0, 0, 0.5, 0.5))
+IntegerListSocket = create_simple_data_socket(
+    "fn_IntegerListSocket", "Integer List", (0.3, 0.7, 0.5, 0.5))
+BooleanListSocket = create_simple_data_socket(
+    "fn_BooleanListSocket", "Boolean List", (0.3, 0.3, 0.3, 0.5))
+ObjectListSocket = create_simple_data_socket(
+    "fn_ObjectListSocket", "Object List", (0, 0, 0, 0.5))
+ImageListSocket = create_simple_data_socket(
+    "fn_ImageListSocket", "Image List", (0.6, 0.6, 0.6, 0.5))
+ColorListSocket = create_simple_data_socket(
+    "fn_ColorListSocket", "Color List", (0.8, 0.8, 0.2, 0.5))
+TextListSocket = create_simple_data_socket(
+    "fn_TextListSocket", "Text List", (0.8, 0.8, 0.8, 0.5))
+SurfaceHookSocket = create_simple_data_socket(
+    "fn_SurfaceHookSocket", "Surface Hook", (0.2, 0.8, 0.2, 1.0))
+SurfaceHookListSocket = create_simple_data_socket(
+    "fn_SurfaceHookListSocket", "Surface Hook List", (0.2, 0.8, 0.2, 0.5))
+
+class ExecuteSocket(bpy.types.NodeSocket, BaseSocket):
+    bl_idname = "fn_ExecuteSocket"
+    bl_label = "Control Flow Socket"
+    color = (0.8, 0.2, 0.2, 1)
+
+class InfluencesSocket(bpy.types.NodeSocket, BaseSocket):
+    bl_idname = "fn_InfluencesSocket"
+    bl_label = "Influences Socket"
+    color = (0.8, 0.8, 0.2, 1)

release/scripts/startup/nodes/sync.py

@@ -0,0 +1,183 @@
+import bpy
+from pprint import pprint
+from contextlib import contextmanager
+
+from . base import BaseNode
+from . tree_data import TreeData
+from . graph import DirectedGraphBuilder
+from . function_tree import FunctionTree
+from . utils.generic import getattr_recursive, setattr_recursive
+
+_is_syncing = False
+
+def sync_trees_and_dependent_trees(trees):
+    global _is_syncing
+    if _is_syncing:
+        return
+    if _skip_syncing:
+        return
+
+    _is_syncing = True
+
+    try:
+        for tree in iter_trees_to_sync_in_order(trees):
+            sync_tree(tree)
+    finally:
+        _is_syncing = False
+
+def sync_tree(tree):
+    rebuild_currently_outdated_nodes(tree)
+
+    tree_data = TreeData(tree)
+
+    tree_changed = run_socket_operators(tree_data)
+    if tree_changed: tree_data = TreeData(tree)
+
+    tree_changed = do_inferencing_and_update_nodes(tree_data)
+    if tree_changed: tree_data = TreeData(tree)
+
+    tree_changed = remove_invalid_links(tree_data)
+
+# Sync skipping
+######################################
+
+_skip_syncing = False
+
+@contextmanager
+def skip_syncing():
+    global _skip_syncing
+    last_state = _skip_syncing
+    _skip_syncing = True
+
+    try:
+        yield
+    finally:
+        _skip_syncing = last_state
+
+
+# Tree sync ordering
+############################################
+
+def iter_trees_to_sync_in_order(trees):
+    stored_tree_ids = {id(tree) for tree in bpy.data.node_groups}
+    if any(id(tree) not in stored_tree_ids for tree in trees):
+        # can happen after undo or on load
+        return
+
+    dependency_graph = FunctionTree.BuildInvertedCallGraph()
+    all_trees_to_sync = dependency_graph.reachable(trees)
+    trees_in_sync_order = dependency_graph.toposort_partial(all_trees_to_sync)
+    yield from trees_in_sync_order
+
+
+# Rebuild already outdated nodes
+############################################
+
+def rebuild_currently_outdated_nodes(tree):
+    outdated_nodes = list(iter_nodes_with_outdated_sockets(tree))
+    rebuild_nodes_and_try_keep_state(outdated_nodes)
+
+def iter_nodes_with_outdated_sockets(tree):
+    for node in tree.nodes:
+        if isinstance(node, BaseNode):
+            if not node_matches_current_declaration(node):
+                yield node
+
+def node_matches_current_declaration(node):
+    from . node_builder import NodeBuilder
+    builder = node.get_node_builder()
+    return builder.matches_sockets()
+
+
+# Socket Operators
+############################################
+
+def run_socket_operators(tree_data):
+    from . sockets import OperatorSocket
+
+    tree_changed = False
+    while True:
+        for link in tree_data.iter_blinks():
+            if isinstance(link.to_socket, OperatorSocket):
+                own_node = link.to_node
+                own_socket = link.to_socket
+                linked_socket = link.from_socket
+                connected_sockets = list(tree_data.iter_connected_origins(own_socket))
+            elif isinstance(link.from_socket, OperatorSocket):
+                own_node = link.from_node
+                own_socket = link.from_socket
+                linked_socket = link.to_socket
+                connected_sockets = list(tree_data.iter_connected_targets(own_socket))
+            else:
+                continue
+
+            tree_data.tree.links.remove(link)
+            decl = own_socket.get_decl(own_node)
+            decl.operator_socket_call(own_socket, linked_socket, connected_sockets)
+            tree_changed = True
+        else:
+            return tree_changed
+
+
+# Inferencing
+####################################
+
+def do_inferencing_and_update_nodes(tree_data):
+    from . inferencing import get_inferencing_decisions
+
+    decisions = get_inferencing_decisions(tree_data)
+
+    nodes_to_rebuild = set()
+
+    for decision_id, value in decisions.items():
+        if getattr_recursive(decision_id.node, decision_id.prop_name) != value:
+            setattr_recursive(decision_id.node, decision_id.prop_name, value)
+            nodes_to_rebuild.add(decision_id.node)
+
+    rebuild_nodes_and_try_keep_state(nodes_to_rebuild)
+
+    tree_changed = len(nodes_to_rebuild) > 0
+    return tree_changed
+
+
+# Remove Invalid Links
+####################################
+
+def remove_invalid_links(tree_data):
+    links_to_remove = set()
+    for from_socket, to_socket in tree_data.iter_connections():
+        if not is_link_valid(tree_data, from_socket, to_socket):
+            links_to_remove.update(tree_data.iter_incident_links(to_socket))
+
+    tree_changed = len(links_to_remove) > 0
+
+    tree = tree_data.tree
+    for link in links_to_remove:
+        tree.links.remove(link)
+
+    return tree_changed
+
+def is_link_valid(tree_data, from_socket, to_socket):
+    from . types import type_infos
+    from . base import DataSocket
+
+    is_data_src = isinstance(from_socket, DataSocket)
+    is_data_dst = isinstance(to_socket, DataSocket)
+
+    if is_data_src != is_data_dst:
+        return False
+
+    if is_data_src and is_data_dst:
+        from_type = from_socket.data_type
+        to_type = to_socket.data_type
+        return type_infos.is_link_allowed(from_type, to_type)
+
+    return True
+
+
+# Utils
+######################################
+
+def rebuild_nodes_and_try_keep_state(nodes):
+    for node in nodes:
+        node.rebuild()

release/scripts/startup/nodes/tree_data.py

@@ -0,0 +1,133 @@
+from collections import defaultdict
+from . base import BaseNode
+
+class TreeData:
+    def __init__(self, tree):
+        self.tree = tree
+        self.links_mapping = find_direct_links_mapping(tree)
+        self.node_by_socket = get_node_by_socket_mapping(tree)
+        self.connections_mapping = find_links_following_reroutes(self.links_mapping, self.node_by_socket)
+        self.link_by_sockets = get_link_by_sockets_mapping(tree)
+
+    def iter_nodes(self):
+        for node in self.tree.nodes:
+            if isinstance(node, BaseNode):
+                yield node
+
+    def iter_blinks(self):
+        yield from self.tree.links
+
+    def iter_connections(self):
+        for socket, others in self.connections_mapping.items():
+            if socket.is_output:
+                continue
+            for other in others:
+                yield other, socket
+
+    def get_node(self, socket):
+        return self.node_by_socket[socket]
+
+    def iter_connected_origins(self, socket):
+        node = self.get_node(socket)
+        if is_reroute(node):
+            socket = node.inputs[0]
+            for other_socket in self.links_mapping[socket]:
+                yield from self.iter_connected_origins(other_socket)
+        else:
+            if socket.is_output:
+                yield socket
+            else:
+                yield from self.iter_connected_sockets(socket)
+
+    def iter_connected_targets(self, socket):
+        node = self.get_node(socket)
+        if is_reroute(node):
+            socket = node.outputs[0]
+            for other_socket in self.links_mapping[socket]:
+                yield from self.iter_connected_targets(other_socket)
+        else:
+            if socket.is_output:
+                yield from self.iter_connected_sockets(socket)
+            else:
+                yield socket
+
+    def iter_connected_sockets(self, socket):
+        yield from self.connections_mapping[socket]
+
+    def iter_connected_sockets_with_nodes(self, socket):
+        for other_socket in self.iter_connected_sockets(socket):
+            other_node = self.get_node(other_socket)
+            yield other_node, other_socket
+
+    def try_get_origin_with_node(self, socket):
+        linked_sockets = self.connections_mapping[socket]
+        amount = len(linked_sockets)
+        if amount == 0:
+            return None, None
+        elif amount == 1:
+            origin_socket = next(iter(linked_sockets))
+            origin_node = self.get_node(origin_socket)
+            return origin_node, origin_socket
+        else:
+            assert False
+
+    def iter_incident_links(self, socket):
+        if socket.is_output:
+            for other_socket in self.links_mapping[socket]:
+                yield self.link_by_sockets[(socket, other_socket)]
+        else:
+            for other_socket in self.links_mapping[socket]:
+                yield self.link_by_sockets[(other_socket, socket)]
+
+def find_direct_links_mapping(tree):
+    direct_links = defaultdict(set)
+    for link in tree.links:
+        direct_links[link.from_socket].add(link.to_socket)
+        direct_links[link.to_socket].add(link.from_socket)
+    return dict(direct_links)
+
+def get_node_by_socket_mapping(tree):
+    node_by_socket = dict()
+    for node in tree.nodes:
+        for socket in node.inputs:
+            node_by_socket[socket] = node
+        for socket in node.outputs:
+            node_by_socket[socket] = node
+    return node_by_socket
+
+def get_link_by_sockets_mapping(tree):
+    link_by_sockets = dict()
+    for link in tree.links:
+        link_by_sockets[(link.from_socket, link.to_socket)] = link
+    return link_by_sockets
+
+def find_links_following_reroutes(direct_links, node_by_socket):
+    links = defaultdict(set)
+    for socket, direct_linked_sockets in direct_links.items():
+        node = node_by_socket[socket]
+        if socket.is_output:
+            # handle every link only once
+            continue
+        if is_reroute(node):
+            continue
+
+        for other_socket in direct_linked_sockets:
+            for origin_socket in iter_non_reroute_outputs(direct_links, node_by_socket, other_socket):
+                links[socket].add(origin_socket)
+                links[origin_socket].add(socket)
+    return links
+
+def iter_non_reroute_outputs(direct_links, node_by_socket, socket):
+    assert socket.is_output
+
+    node = node_by_socket[socket]
+    if is_reroute(node):
+        input_socket = node.inputs[0]
+        if input_socket in direct_links:
+            for origin_socket in direct_links[input_socket]:
+                yield from iter_non_reroute_outputs(direct_links, node_by_socket, origin_socket)
+    else:
+        yield socket
+
+def is_reroute(node):
+    return node.bl_idname == "NodeReroute"

release/scripts/startup/nodes/tree_panel.py

@@ -0,0 +1,17 @@
+import bpy
+from . ui import NodeSidebarPanel
+from . base import BaseTree
+
+class TreePanel(bpy.types.Panel, NodeSidebarPanel):
+    bl_idname = "FN_PT_tree_panel"
+    bl_label = "Tree"
+
+    @classmethod
+    def poll(self, context):
+        try: return isinstance(context.space_data.edit_tree, BaseTree)
+        except: return False
+
+    def draw(self, context):
+        layout = self.layout
+
+        tree = context.space_data.edit_tree

release/scripts/startup/nodes/types.py

@@ -0,0 +1,16 @@
+from . import sockets as s
+from . types_base import DataTypesInfo
+
+type_infos = DataTypesInfo()
+
+type_infos.insert_data_type(s.FloatSocket, s.FloatListSocket)
+type_infos.insert_data_type(s.VectorSocket, s.VectorListSocket)
+type_infos.insert_data_type(s.IntegerSocket, s.IntegerListSocket)
+type_infos.insert_data_type(s.BooleanSocket, s.BooleanListSocket)
+type_infos.insert_data_type(s.ObjectSocket, s.ObjectListSocket)
+type_infos.insert_data_type(s.ImageSocket, s.ImageListSocket)
+type_infos.insert_data_type(s.ColorSocket, s.ColorListSocket)
+type_infos.insert_data_type(s.TextSocket, s.TextListSocket)
+type_infos.insert_data_type(s.SurfaceHookSocket, s.SurfaceHookListSocket)
+
+type_infos.insert_conversion_group(["Boolean", "Integer", "Float"])

release/scripts/startup/nodes/types_base.py

@@ -0,0 +1,164 @@
+import itertools
+from collections import namedtuple
+
+'''
+Type Rules
+==========
+
+A -> B means, Type A can be converted to type B implicitely.
+A -!> B means, Type A cannot be converted to type B implicitely.
+A_List is the type that contains a list of elements of type A
+
+Iff T1 -> T2, then T1_List -> T2_List.
+T -> T_List.
+T_List -!> T.
+
+Types always come in pairs: T and T_List.
+There are no lists of lists.
+
+A type can be in zero or one conversion group.
+Every type in this group can be converted to any other implicitely.
+The types within a group are ordered by their "rank".
+When two types with different rank are used in one expression,
+the type with lower rank is converted to the other.
+'''
+
+# Type Info Container
+#####################################
+
+ImplicitConversion = namedtuple("ImplicitConversion", ("from_type", "to_type"))
+
+class DataTypesInfo:
+    def __init__(self):
+        self.data_types = set()
+        self.cls_by_data_type = dict()
+        self.list_by_base = dict()
+        self.base_by_list = dict()
+        self.unidirectional_conversions = set()
+        self.conversion_groups = dict()
+        self.all_implicit_conversions = set()
+
+
+    # Insert New Information
+    #############################
+
+    def insert_data_type(self, base_socket_cls, list_socket_cls):
+        base_type = base_socket_cls.data_type
+        list_type = list_socket_cls.data_type
+
+        assert base_type not in self.data_types
+        assert list_type not in self.data_types
+
+        self.data_types.add(base_type)
+        self.data_types.add(list_type)
+        self.list_by_base[base_type] = list_type
+        self.base_by_list[list_type] = base_type
+        self.cls_by_data_type[base_type] = base_socket_cls
+        self.cls_by_data_type[list_type] = list_socket_cls
+
+        self.all_implicit_conversions.add(ImplicitConversion(base_type, list_type))
+
+    def insert_conversion_group(self, types_by_rank):
+        '''lowest rank comes first'''
+
+        for data_type in types_by_rank:
+            assert self.is_data_type(data_type)
+            assert self.is_base(data_type)
+            assert data_type not in self.conversion_groups
+
+        group = tuple(types_by_rank)
+        for data_type in types_by_rank:
+            self.conversion_groups[data_type] = group
+
+        for from_base_type, to_base_type in itertools.combinations(group, 2):
+            from_list_type = self.to_list(from_base_type)
+            to_list_type = self.to_list(to_base_type)
+            self.all_implicit_conversions.add(ImplicitConversion(from_base_type, to_base_type))
+            self.all_implicit_conversions.add(ImplicitConversion(to_base_type, from_base_type))
+            self.all_implicit_conversions.add(ImplicitConversion(from_list_type, to_list_type))
+            self.all_implicit_conversions.add(ImplicitConversion(to_list_type, from_list_type))
+
+    def insert_unidirectional_conversion(self, from_type, to_type):
+        assert self.is_data_type(from_type)
+        assert self.is_data_type(to_type)
+        assert self.is_base(from_type)
+        assert self.is_base(to_type)
+
+        base_conversion = ImplicitConversion(from_type, to_type)
+        assert base_conversion not in self.implicit_conversions
+        self.implicit_conversions.add(base_conversion)
+        self.all_implicit_conversions.add(base_conversion)
+
+        list_conversion = ImplicitConversion(
+            self.to_list(from_type), self.to_list(to_type))
+        assert list_conversion not in self.implicit_conversions
+        self.implicit_conversions.add(list_conversion)
+        self.all_implicit_conversions.add(list_conversion)
+
+
+    # Query Information
+    ##########################
+
+    def is_data_type(self, data_type):
+        return data_type in self.data_types
+
+    def is_base(self, data_type):
+        return data_type in self.list_by_base
+
+    def is_list(self, data_type):
+        return data_type in self.base_by_list
+
+    def to_list(self, data_type):
+        assert self.is_base(data_type)
+        return self.list_by_base[data_type]
+
+    def to_base(self, data_type):
+        assert self.is_list(data_type)
+        return self.base_by_list[data_type]
+
+    def get_data_type_items(self):
+        items = []
+        for data_type in self.data_types:
+            items.append((data_type, data_type, ""))
+        return items
+
+    def get_base_type_items(self):
+        items = []
+        for data_type in self.iter_base_types():
+            items.append((data_type, data_type, ""))
+        return items
+
+    def get_data_type_items_cb(self):
+        def callback(_1, _2):
+            return self.get_data_type_items()
+        return callback
+
+    def get_socket_color(self, data_type):
+        builder = self.to_builder(data_type)
+        return builder.get_color()
+
+    def is_link_allowed(self, from_type, to_type):
+        assert self.is_data_type(from_type)
+        assert self.is_data_type(to_type)
+
+        if from_type == to_type:
+            return True
+        else:
+            return self.is_implicitly_convertable(from_type, to_type)
+
+    def is_implicitly_convertable(self, from_type, to_type):
+        return ImplicitConversion(from_type, to_type) in self.all_implicit_conversions
+
+    def iter_list_types(self):
+        yield from self.base_by_list.keys()
+
+    def iter_base_types(self):
+        yield from self.list_by_base.keys()
+
+    # Build
+    ##########################
+
+    def build(self, data_type, node_sockets, name, identifier):
+        idname = self.cls_by_data_type[data_type].bl_idname
+        socket = node_sockets.new(idname, name, identifier=identifier)
+        return socket

release/scripts/startup/nodes/ui.py

@@ -0,0 +1,6 @@
+import bpy
+
+class NodeSidebarPanel:
+    bl_space_type = 'NODE_EDITOR'
+    bl_region_type = 'UI'
+    bl_category = "Node"

release/scripts/startup/nodes/utils/enum_items_cache.py

@@ -0,0 +1,20 @@
+import functools
+from collections import defaultdict
+
+cached_item_tuples_by_hash = defaultdict(list)
+
+def cache_enum_items(items_cb):
+
+    @functools.wraps(items_cb)
+    def wrapper(self, context):
+        item_tuples = tuple(items_cb(self, context))
+        item_tuples_hash = hash(item_tuples)
+
+        for cached_item_tuple in cached_item_tuples_by_hash[item_tuples_hash]:
+            if cached_item_tuple == item_tuples:
+                return cached_item_tuple
+        else:
+            cached_item_tuples_by_hash[item_tuples_hash].append(item_tuples)
+            return item_tuples
+
+    return wrapper

release/scripts/startup/nodes/utils/generic.py

@@ -0,0 +1,21 @@
+import string
+import random
+
+def iter_subclasses_recursive(cls):
+    for sub in cls.__subclasses__():
+        yield sub
+        yield from iter_subclasses_recursive(sub)
+
+def getattr_recursive(obj, name: str):
+    if "." not in name and "[" not in name:
+        return getattr(obj, name)
+    else:
+        # TODO: implement without eval
+        return eval("obj." + name, globals(), locals())
+
+def setattr_recursive(obj, name: str, value):
+    if "." not in name and "[" not in name:
+        setattr(obj, name, value)
+    else:
+        # TODO: implement without exec
+        exec("obj." + name + " = value", globals(), locals())

release/scripts/startup/nodes/utils/graph.py

@@ -0,0 +1,19 @@
+def iter_connected_components(nodes: set, links: dict):
+    nodes = set(nodes)
+    while len(nodes) > 0:
+        start_node = next(iter(nodes))
+        component = depth_first_search(start_node, links)
+        yield component
+        nodes -= component
+
+def depth_first_search(start_node, links):
+    result = set()
+    found = set()
+    found.add(start_node)
+    while len(found) > 0:
+        node = found.pop()
+        result.add(node)
+        for linked_node in links[node]:
+            if linked_node not in result:
+                found.add(linked_node)
+    return result

release/scripts/startup/nodes/utils/pie_menu_helper.py

@@ -0,0 +1,38 @@
+class PieMenuHelper:
+    def draw(self, context):
+        pie = self.layout.menu_pie()
+        self.draw_left(pie)
+        self.draw_right(pie)
+        self.draw_bottom(pie)
+        self.draw_top(pie)
+        self.draw_top_left(pie)
+        self.draw_top_right(pie)
+        self.draw_bottom_left(pie)
+        self.draw_bottom_right(pie)
+
+    def draw_left(self, layout):
+        self.empty(layout)
+
+    def draw_right(self, layout):
+        self.empty(layout)
+
+    def draw_bottom(self, layout):
+        self.empty(layout)
+
+    def draw_top(self, layout):
+        self.empty(layout)
+
+    def draw_top_left(self, layout):
+        self.empty(layout)
+
+    def draw_top_right(self, layout):
+        self.empty(layout)
+
+    def draw_bottom_left(self, layout):
+        self.empty(layout)
+
+    def draw_bottom_right(self, layout):
+        self.empty(layout)
+
+    def empty(self, layout, text=""):
+        layout.row().label(text=text)

source/blender/CMakeLists.txt

@@ -113,6 +113,8 @@ add_subdirectory(nodes)
 add_subdirectory(modifiers)
 add_subdirectory(gpencil_modifiers)
 add_subdirectory(shader_fx)
+add_subdirectory(functions)
+add_subdirectory(simulations)
 add_subdirectory(io)
 add_subdirectory(makesdna)
 add_subdirectory(makesrna)

source/blender/blenkernel/BKE_fcurve.h

@@ -257,6 +257,8 @@ struct FCurve *iter_step_fcurve(struct FCurve *fcu_iter, const char rna_path[]);
 struct FCurve *id_data_find_fcurve(
     ID *id, void *data, struct StructRNA *type, const char *prop_name, int index, bool *r_driven);
 
+void *get_driver_variable_function(struct DriverVar *dvar);
+
 /* Get list of LinkData's containing pointers to the F-Curves which control the types of data
  * indicated
  * e.g.  numMatches = list_find_data_fcurves(matches, &act->curves, "pose.bones[", "MyFancyBone");

source/blender/blenkernel/BKE_id_data_cache.h

@@ -0,0 +1,34 @@
+#ifndef __BKE_ID_DATA_CACHE_H__
+#define __BKE_ID_DATA_CACHE_H__
+
+#include <mutex>
+
+#include "BLI_kdopbvh.h"
+#include "BLI_kdtree.h"
+#include "BLI_map.h"
+
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+#include "DNA_object_types.h"
+
+#include "BKE_bvhutils.h"
+
+namespace BKE {
+
+using BLI::Map;
+
+class IDDataCache {
+ private:
+  mutable Map<Object *, BVHTreeFromMesh *> m_bvh_trees;
+  mutable std::mutex m_bvt_trees_mutex;
+
+ public:
+  IDDataCache() = default;
+  ~IDDataCache();
+
+  BVHTreeFromMesh *get_bvh_tree(Object *object) const;
+};
+
+}  // namespace BKE
+
+#endif /* __BKE_ID_DATA_CACHE_H__ */

source/blender/blenkernel/BKE_id_handle.h

@@ -0,0 +1,108 @@
+#ifndef __BKE_ID_HANDLE_H__
+#define __BKE_ID_HANDLE_H__
+
+#include "BLI_utildefines.h"
+
+#include "BLI_map.h"
+
+extern "C" {
+struct ID;
+struct Object;
+struct Image;
+}
+
+namespace BKE {
+
+using BLI::Map;
+
+/**
+ * This is a weak reference to an ID data-block. It does not contain a pointer to the actual data.
+ * It can happen that the IDHandle references data, that does not exist anymore. The handle does
+ * not know that.
+ */
+class IDHandle {
+ private:
+  uint32_t m_identifier;
+
+ public:
+  IDHandle() : m_identifier((uint32_t)-1)
+  {
+  }
+
+  IDHandle(struct ID *id);
+
+  friend bool operator==(IDHandle a, IDHandle b)
+  {
+    return a.m_identifier == b.m_identifier;
+  }
+
+  friend bool operator!=(IDHandle a, IDHandle b)
+  {
+    return !(a == b);
+  }
+
+  uint32_t internal_identifier() const
+  {
+    return m_identifier;
+  }
+};
+
+class ObjectIDHandle : public IDHandle {
+ public:
+  ObjectIDHandle() : IDHandle()
+  {
+  }
+
+  ObjectIDHandle(struct Object *object);
+};
+
+class ImageIDHandle : public IDHandle {
+ public:
+  ImageIDHandle() : IDHandle()
+  {
+  }
+
+  ImageIDHandle(struct Image *image);
+};
+
+class IDHandleLookup {
+ private:
+  Map<IDHandle, ID *> m_handle_to_id_map;
+
+ public:
+  void add(ID &id)
+  {
+    IDHandle handle(&id);
+    m_handle_to_id_map.add(handle, &id);
+  }
+
+  ID *lookup(IDHandle handle) const
+  {
+    return m_handle_to_id_map.lookup_default(handle, nullptr);
+  }
+
+  struct Object *lookup(ObjectIDHandle handle) const
+  {
+    return reinterpret_cast<struct Object *>(this->lookup((IDHandle)handle));
+  }
+
+  struct Image *lookup(ImageIDHandle handle) const
+  {
+    return reinterpret_cast<struct Image *>(this->lookup((IDHandle)handle));
+  }
+
+  static const IDHandleLookup &Empty();
+};
+
+}  // namespace BKE
+
+namespace BLI {
+template<> struct DefaultHash<BKE::IDHandle> {
+  uint32_t operator()(const BKE::IDHandle &value) const
+  {
+    return value.internal_identifier();
+  }
+};
+}  // namespace BLI
+
+#endif /* __BKE_ID_HANDLE_H__ */

source/blender/blenkernel/BKE_node.h

@@ -145,6 +145,7 @@ typedef struct bNodeSocketType {
 
   /* for standard socket types in C */
   int type, subtype;
+  int display_shape_default;
 
   /* When set, bNodeSocket->limit does not have any effect anymore. */
   bool use_link_limits_of_type;
@@ -999,6 +1000,39 @@ void BKE_nodetree_remove_layer_n(struct bNodeTree *ntree,
 #define SH_NODE_OUTPUT_AOV 707
 #define SH_NODE_VECTOR_ROTATE 708
 
+#define SIM_NODE_PARTICLE_SIMULATION 1000
+#define SIM_NODE_FORCE 1001
+#define SIM_NODE_SET_PARTICLE_ATTRIBUTE 1002
+#define SIM_NODE_PARTICLE_BIRTH_EVENT 1003
+#define SIM_NODE_PARTICLE_TIME_STEP_EVENT 1004
+#define SIM_NODE_EXECUTE_CONDITION 1005
+#define SIM_NODE_MULTI_EXECUTE 1006
+#define SIM_NODE_PARTICLE_MESH_EMITTER 1007
+#define SIM_NODE_PARTICLE_MESH_COLLISION_EVENT 1008
+#define SIM_NODE_EMIT_PARTICLES 1009
+#define SIM_NODE_SIMULATION_TIME 1010
+#define SIM_NODE_PARTICLE_ATTRIBUTE 1011
+
+#define FN_NODE_COMBINE_XYZ 1100
+#define FN_NODE_SEPARATE_XYZ 1101
+#define FN_NODE_COMBINE_RGB 1102
+#define FN_NODE_SEPARATE_RGB 1103
+#define FN_NODE_COMBINE_HSV 1104
+#define FN_NODE_SEPARATE_HSV 1105
+#define FN_NODE_FLOAT_MATH 1106
+#define FN_NODE_VECTOR_MATH 1107
+#define FN_NODE_SURFACE_COLOR 1108
+#define FN_NODE_SURFACE_NORMAL 1109
+#define FN_NODE_SURFACE_POSITION 1110
+#define FN_NODE_SURFACE_WEIGHT 1111
+#define FN_NODE_CLOSEST_SURFACE 1112
+#define FN_NODE_BOOLEAN_MATH 1113
+#define FN_NODE_FLOAT_COMPARE 1114
+#define FN_NODE_INSTANCE_IDENTIFIER 1115
+#define FN_NODE_STRING_CONCATENATION 1116
+#define FN_NODE_OBJECT_TRANSFORMS 1117
+#define FN_NODE_SWITCH 1118
+
 /* custom defines options for Material node */
 // #define SH_NODE_MAT_DIFF 1
 // #define SH_NODE_MAT_SPEC 2

source/blender/blenkernel/BKE_surface_hook.h

@@ -0,0 +1,97 @@
+#ifndef __BKE_SURFACE_HOOK_H__
+#define __BKE_SURFACE_HOOK_H__
+
+#include "BLI_float3.h"
+#include "BLI_utildefines.h"
+
+#include "BKE_id_handle.h"
+
+namespace BKE {
+
+using BLI::float3;
+
+namespace SurfaceHookType {
+enum Enum {
+  None,
+  MeshObject,
+};
+}
+
+/**
+ * References a point on a surface. If the surface moves, the point moves with it.
+ */
+class SurfaceHook {
+ private:
+  SurfaceHookType::Enum m_type;
+
+  /**
+   * Used to identify the object if m_type is MeshObject.
+   */
+  ObjectIDHandle m_object_handle;
+
+  /* Index of the triangle that contains the referenced location. */
+  uint32_t m_triangle_index;
+
+  /* Barycentric coordinates of the referenced location inside the triangle. */
+  float3 m_bary_coords;
+
+ public:
+  SurfaceHook() : m_type(SurfaceHookType::None)
+  {
+  }
+
+  SurfaceHook(ObjectIDHandle object_handle, uint32_t triangle_index, float3 bary_coords)
+      : m_type(SurfaceHookType::MeshObject),
+        m_object_handle(object_handle),
+        m_triangle_index(triangle_index),
+        m_bary_coords(bary_coords)
+  {
+  }
+
+  SurfaceHookType::Enum type() const
+  {
+    return m_type;
+  }
+
+  bool is_valid() const
+  {
+    return m_type != SurfaceHookType::None;
+  }
+
+  ObjectIDHandle object_handle() const
+  {
+    BLI_assert(m_type == SurfaceHookType::MeshObject);
+    return m_object_handle;
+  }
+
+  uint32_t triangle_index() const
+  {
+    BLI_assert(m_type == SurfaceHookType::MeshObject);
+    return m_triangle_index;
+  }
+
+  float3 bary_coords() const
+  {
+    BLI_assert(m_type == SurfaceHookType::MeshObject);
+    return m_bary_coords;
+  }
+
+  static bool on_same_surface(const SurfaceHook &a, const SurfaceHook &b)
+  {
+    if (a.type() != b.type()) {
+      return false;
+    }
+    switch (a.type()) {
+      case BKE::SurfaceHookType::None:
+        return true;
+      case BKE::SurfaceHookType::MeshObject:
+        return a.object_handle() == b.object_handle();
+    }
+    BLI_assert(false);
+    return false;
+  }
+};
+
+}  // namespace BKE
+
+#endif /* __BKE_SURFACE_HOOK_H__ */

source/blender/blenkernel/BKE_virtual_node_tree.h

@@ -0,0 +1,367 @@
+#ifndef __BKE_VIRTUAL_NODE_TREE_H__
+#define __BKE_VIRTUAL_NODE_TREE_H__
+
+#include "BLI_array_cxx.h"
+#include "BLI_linear_allocated_vector.h"
+#include "BLI_resource_collector.h"
+#include "BLI_string_map.h"
+#include "BLI_string_multi_map.h"
+#include "BLI_string_ref.h"
+#include "BLI_utility_mixins.h"
+#include "BLI_vector.h"
+
+#include "DNA_node_types.h"
+
+#include "RNA_access.h"
+
+namespace BKE {
+
+using BLI::Array;
+using BLI::ArrayRef;
+using BLI::LinearAllocatedVector;
+using BLI::ResourceCollector;
+using BLI::StringMap;
+using BLI::StringMultiMap;
+using BLI::StringRef;
+using BLI::StringRefNull;
+using BLI::Vector;
+
+class VSocket;
+class VInputSocket;
+class VOutputSocket;
+class VNode;
+class VirtualNodeTree;
+
+/* Virtual Node Tree declarations
+ ******************************************/
+
+class VSocket : BLI::NonCopyable, BLI::NonMovable {
+ protected:
+  LinearAllocatedVector<VSocket *> m_linked_sockets;
+  LinearAllocatedVector<VSocket *> m_directly_linked_sockets;
+  VNode *m_node;
+  bool m_is_input;
+  bNodeSocket *m_bsocket;
+  uint m_id;
+  PointerRNA m_rna;
+  uint m_index;
+
+  friend VirtualNodeTree;
+
+ public:
+  ArrayRef<const VSocket *> linked_sockets() const;
+  ArrayRef<const VSocket *> directly_linked_sockets() const;
+
+  const VNode &node() const;
+  const VirtualNodeTree &tree() const;
+  uint id() const;
+
+  uint index() const;
+
+  bool is_input() const;
+  bool is_output() const;
+
+  const VSocket &as_base() const;
+  const VInputSocket &as_input() const;
+  const VOutputSocket &as_output() const;
+
+  PointerRNA *rna() const;
+
+  StringRefNull idname() const;
+  StringRefNull name() const;
+
+  bool is_linked() const;
+
+  bNodeSocket *bsocket() const;
+  bNodeTree *btree() const;
+};
+
+class VInputSocket final : public VSocket {
+ public:
+  ArrayRef<const VOutputSocket *> linked_sockets() const;
+  ArrayRef<const VOutputSocket *> directly_linked_sockets() const;
+};
+
+class VOutputSocket final : public VSocket {
+ public:
+  ArrayRef<const VInputSocket *> linked_sockets() const;
+  ArrayRef<const VInputSocket *> directly_linked_sockets() const;
+};
+
+class VNode : BLI::NonCopyable, BLI::NonMovable {
+ private:
+  VirtualNodeTree *m_vtree;
+  LinearAllocatedVector<VInputSocket *> m_inputs;
+  LinearAllocatedVector<VOutputSocket *> m_outputs;
+  bNode *m_bnode;
+  uint m_id;
+  PointerRNA m_rna;
+
+  friend VirtualNodeTree;
+
+ public:
+  const VirtualNodeTree &tree() const;
+
+  ArrayRef<const VInputSocket *> inputs() const;
+  ArrayRef<const VOutputSocket *> outputs() const;
+
+  PointerRNA *rna() const;
+  StringRefNull idname() const;
+  StringRefNull name() const;
+
+  const VInputSocket &input(uint index) const;
+  const VOutputSocket &output(uint index) const;
+
+  const VInputSocket &input(uint index, StringRef expected_name) const;
+  const VOutputSocket &output(uint index, StringRef expected_name) const;
+
+  bNode *bnode() const;
+  bNodeTree *btree() const;
+
+  uint id() const;
+};
+
+class VirtualNodeTree : BLI::NonCopyable, BLI::NonMovable {
+ private:
+  BLI::LinearAllocator<> m_allocator;
+  bNodeTree *m_btree;
+  Vector<VNode *> m_nodes_by_id;
+  Vector<VSocket *> m_sockets_by_id;
+  Vector<VInputSocket *> m_input_sockets;
+  Vector<VOutputSocket *> m_output_sockets;
+  StringMultiMap<VNode *> m_nodes_by_idname;
+
+ public:
+  VirtualNodeTree(bNodeTree *btree);
+  ~VirtualNodeTree();
+
+  ArrayRef<const VNode *> nodes() const;
+  ArrayRef<const VNode *> nodes_with_idname(StringRef idname) const;
+  uint socket_count() const;
+
+  ArrayRef<const VSocket *> all_sockets() const;
+  ArrayRef<const VInputSocket *> all_input_sockets() const;
+  ArrayRef<const VOutputSocket *> all_output_sockets() const;
+
+  const VSocket &socket_by_id(uint id) const;
+
+  bNodeTree *btree() const;
+
+ private:
+  void find_targets_skipping_reroutes(VOutputSocket &vsocket,
+                                      LinearAllocatedVector<VSocket *> &r_targets);
+};
+
+/* Virtual Node Tree inline functions
+ ****************************************************/
+
+inline ArrayRef<const VSocket *> VSocket::linked_sockets() const
+{
+  return m_linked_sockets.as_ref();
+}
+
+inline ArrayRef<const VSocket *> VSocket::directly_linked_sockets() const
+{
+  return m_directly_linked_sockets.as_ref();
+}
+
+inline const VirtualNodeTree &VSocket::tree() const
+{
+  return m_node->tree();
+}
+
+inline const VNode &VSocket::node() const
+{
+  return *m_node;
+}
+
+inline uint VSocket::id() const
+{
+  return m_id;
+}
+
+inline uint VSocket::index() const
+{
+  return m_index;
+}
+
+inline bool VSocket::is_input() const
+{
+  return m_is_input;
+}
+
+inline bool VSocket::is_output() const
+{
+  return !m_is_input;
+}
+
+inline bool VSocket::is_linked() const
+{
+  return m_linked_sockets.size() > 0;
+}
+
+inline const VSocket &VSocket::as_base() const
+{
+  return *this;
+}
+
+inline const VInputSocket &VSocket::as_input() const
+{
+  BLI_assert(this->is_input());
+  return *(const VInputSocket *)this;
+}
+
+inline const VOutputSocket &VSocket::as_output() const
+{
+  BLI_assert(this->is_output());
+  return *(const VOutputSocket *)this;
+}
+
+inline PointerRNA *VSocket::rna() const
+{
+  return const_cast<PointerRNA *>(&m_rna);
+}
+
+inline StringRefNull VSocket::idname() const
+{
+  return m_bsocket->idname;
+}
+
+inline StringRefNull VSocket::name() const
+{
+  return m_bsocket->name;
+}
+
+inline bNodeSocket *VSocket::bsocket() const
+{
+  return m_bsocket;
+}
+
+inline ArrayRef<const VOutputSocket *> VInputSocket::linked_sockets() const
+{
+  return m_linked_sockets.as_ref().cast<const VOutputSocket *>();
+  ;
+}
+
+inline ArrayRef<const VOutputSocket *> VInputSocket::directly_linked_sockets() const
+{
+  return m_directly_linked_sockets.as_ref().cast<const VOutputSocket *>();
+}
+
+inline ArrayRef<const VInputSocket *> VOutputSocket::linked_sockets() const
+{
+  return m_linked_sockets.as_ref().cast<const VInputSocket *>();
+}
+
+inline ArrayRef<const VInputSocket *> VOutputSocket::directly_linked_sockets() const
+{
+  return m_directly_linked_sockets.as_ref().cast<const VInputSocket *>();
+}
+
+inline ArrayRef<const VInputSocket *> VNode::inputs() const
+{
+  return m_inputs.as_ref();
+}
+
+inline ArrayRef<const VOutputSocket *> VNode::outputs() const
+{
+  return m_outputs.as_ref();
+}
+
+inline const VirtualNodeTree &VNode::tree() const
+{
+  return *m_vtree;
+}
+
+inline PointerRNA *VNode::rna() const
+{
+  return const_cast<PointerRNA *>(&m_rna);
+}
+
+inline StringRefNull VNode::idname() const
+{
+  return m_bnode->idname;
+}
+
+inline StringRefNull VNode::name() const
+{
+  return m_bnode->name;
+}
+
+inline const VInputSocket &VNode::input(uint index) const
+{
+  return *m_inputs[index];
+}
+
+inline const VOutputSocket &VNode::output(uint index) const
+{
+  return *m_outputs[index];
+}
+
+inline const VInputSocket &VNode::input(uint index, StringRef expected_name) const
+{
+  BLI_assert(m_inputs[index]->name() == expected_name);
+  UNUSED_VARS_NDEBUG(expected_name);
+  return *m_inputs[index];
+}
+
+inline const VOutputSocket &VNode::output(uint index, StringRef expected_name) const
+{
+  BLI_assert(m_outputs[index]->name() == expected_name);
+  UNUSED_VARS_NDEBUG(expected_name);
+  return *m_outputs[index];
+}
+
+inline bNode *VNode::bnode() const
+{
+  return m_bnode;
+}
+
+inline uint VNode::id() const
+{
+  return m_id;
+}
+
+inline bNodeTree *VirtualNodeTree::btree() const
+{
+  return m_btree;
+}
+
+inline ArrayRef<const VNode *> VirtualNodeTree::nodes() const
+{
+  return m_nodes_by_id.as_ref();
+}
+
+inline ArrayRef<const VNode *> VirtualNodeTree::nodes_with_idname(StringRef idname) const
+{
+  return m_nodes_by_idname.lookup_default(idname);
+}
+
+inline uint VirtualNodeTree::socket_count() const
+{
+  return m_sockets_by_id.size();
+}
+
+inline ArrayRef<const VSocket *> VirtualNodeTree::all_sockets() const
+{
+  return m_sockets_by_id.as_ref();
+}
+
+inline ArrayRef<const VInputSocket *> VirtualNodeTree::all_input_sockets() const
+{
+  return m_input_sockets.as_ref();
+}
+
+inline ArrayRef<const VOutputSocket *> VirtualNodeTree::all_output_sockets() const
+{
+  return m_output_sockets.as_ref();
+}
+
+inline const VSocket &VirtualNodeTree::socket_by_id(uint id) const
+{
+  return *m_sockets_by_id[id];
+}
+
+}  // namespace BKE
+
+#endif /* __BKE_VIRTUAL_NODE_TREE_H__ */

source/blender/blenkernel/CMakeLists.txt

@@ -37,6 +37,7 @@ set(INC
   ../nodes
   ../physics
   ../shader_fx
+  ../simulations
   ../render/extern/include
   ../../../intern/ghost
   ../../../intern/glew-mx
@@ -128,6 +129,8 @@ set(SRC
   intern/icons_rasterize.c
   intern/idprop.c
   intern/idprop_utils.c
+  intern/id_data_cache.cc
+  intern/id_handle.cc
   intern/idtype.c
   intern/image.c
   intern/image_gen.c
@@ -230,6 +233,7 @@ set(SRC
   intern/subdiv_stats.c
   intern/subdiv_topology.c
   intern/subsurf_ccg.c
+  intern/surface_hook.cc
   intern/text.c
   intern/text_suggestions.c
   intern/texture.c
@@ -243,6 +247,7 @@ set(SRC
   intern/tracking_util.c
   intern/undo_system.c
   intern/unit.c
+  intern/virtual_node_tree.cc
   intern/volume.cc
   intern/volume_render.cc
   intern/workspace.c
@@ -309,6 +314,8 @@ set(SRC
   BKE_hair.h
   BKE_icons.h
   BKE_idprop.h
+  BKE_id_data_cache.h
+  BKE_id_handle.h
   BKE_idtype.h
   BKE_image.h
   BKE_ipo.h
@@ -374,12 +381,14 @@ set(SRC
   BKE_subdiv_mesh.h
   BKE_subdiv_topology.h
   BKE_subsurf.h
+  BKE_surface_hook.h
   BKE_text.h
   BKE_text_suggestions.h
   BKE_texture.h
   BKE_tracking.h
   BKE_undo_system.h
   BKE_unit.h
+  BKE_virtual_node_tree.h
   BKE_volume.h
   BKE_volume_render.h
   BKE_workspace.h

source/blender/blenkernel/intern/fcurve.c

@@ -1871,15 +1871,15 @@ static DriverVarTypeInfo dvar_types[MAX_DVAR_TYPES] = {
     BEGIN_DVAR_TYPEDEF(DVAR_TYPE_ROT_DIFF) dvar_eval_rotDiff, /* eval callback */
     2,                                                        /* number of targets used */
     {"Object/Bone 1", "Object/Bone 2"},                       /* UI names for targets */
-    {DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY,
-     DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY} /* flags */
+    {DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY, DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY}
+    /* flags */
     END_DVAR_TYPEDEF,
 
     BEGIN_DVAR_TYPEDEF(DVAR_TYPE_LOC_DIFF) dvar_eval_locDiff, /* eval callback */
     2,                                                        /* number of targets used */
     {"Object/Bone 1", "Object/Bone 2"},                       /* UI names for targets */
-    {DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY,
-     DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY} /* flags */
+    {DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY, DTAR_FLAG_STRUCT_REF | DTAR_FLAG_ID_OB_ONLY}
+    /* flags */
     END_DVAR_TYPEDEF,
 
     BEGIN_DVAR_TYPEDEF(DVAR_TYPE_TRANSFORM_CHAN) dvar_eval_transChan, /* eval callback */
@@ -1983,6 +1983,10 @@ void driver_change_variable_type(DriverVar *dvar, int type)
     if ((flags & DTAR_FLAG_ID_OB_ONLY) || (dtar->idtype == 0)) {
       dtar->idtype = ID_OB;
     }
+
+    if (type == DVAR_TYPE_FUNCTION) {
+      dtar->idtype = ID_NT;
+    }
   }
   DRIVER_TARGETS_LOOPER_END;
 }

source/blender/blenkernel/intern/id_data_cache.cc

@@ -0,0 +1,31 @@
+#include "BKE_id_data_cache.h"
+
+namespace BKE {
+
+IDDataCache::~IDDataCache()
+{
+  for (auto bvhtree : m_bvh_trees.values()) {
+    if (bvhtree != nullptr) {
+      free_bvhtree_from_mesh(bvhtree);
+      delete bvhtree;
+    }
+  }
+}
+
+BVHTreeFromMesh *IDDataCache::get_bvh_tree(Object *object) const
+{
+  BLI_assert(object != nullptr);
+
+  std::lock_guard<std::mutex> lock(m_bvt_trees_mutex);
+
+  return m_bvh_trees.lookup_or_add(object, [&]() -> BVHTreeFromMesh * {
+    if (object->type != OB_MESH) {
+      return nullptr;
+    }
+    BVHTreeFromMesh *bvhtree_data = new BVHTreeFromMesh();
+    BKE_bvhtree_from_mesh_get(bvhtree_data, (Mesh *)object->data, BVHTREE_FROM_LOOPTRI, 2);
+    return bvhtree_data;
+  });
+}
+
+}  // namespace BKE

source/blender/blenkernel/intern/id_handle.cc

@@ -0,0 +1,33 @@
+#include "BLI_hash.h"
+#include "BLI_utildefines.h"
+
+#include "BKE_id_handle.h"
+
+#include "DNA_ID.h"
+#include "DNA_image_types.h"
+#include "DNA_object_types.h"
+
+namespace BKE {
+
+IDHandle::IDHandle(ID *id)
+{
+  BLI_assert(id != nullptr);
+  m_identifier = BLI_hash_string(id->name);
+}
+
+ObjectIDHandle::ObjectIDHandle(Object *object) : IDHandle(&object->id)
+{
+}
+
+ImageIDHandle::ImageIDHandle(Image *image) : IDHandle(&image->id)
+{
+}
+
+static IDHandleLookup empty_id_handle_lookup;
+
+const IDHandleLookup &IDHandleLookup::Empty()
+{
+  return empty_id_handle_lookup;
+}
+
+}  // namespace BKE

source/blender/blenkernel/intern/lib_query.c

@@ -204,6 +204,21 @@ static void library_foreach_idproperty_ID_link(LibraryForeachIDData *data,
   FOREACH_FINALIZE_VOID;
 }
 
+static void library_foreach_node_socket(LibraryForeachIDData *data, bNodeSocket *sock)
+{
+  library_foreach_idproperty_ID_link(data, sock->prop, IDWALK_CB_USER);
+
+  if (sock->type == SOCK_OBJECT) {
+    bNodeSocketValueObject *default_value = sock->default_value;
+    FOREACH_CALLBACK_INVOKE_ID_PP(data, (ID **)&default_value->object, IDWALK_CB_USER);
+  }
+  else if (sock->type == SOCK_IMAGE) {
+    bNodeSocketValueImage *default_value = sock->default_value;
+    FOREACH_CALLBACK_INVOKE_ID_PP(data, (ID **)&default_value->image, IDWALK_CB_USER);
+  }
+  FOREACH_FINALIZE_VOID;
+}
+
 static void library_foreach_rigidbodyworldSceneLooper(struct RigidBodyWorld *UNUSED(rbw),
                                                       ID **id_pointer,
                                                       void *user_data,
@@ -1025,18 +1040,18 @@ static void library_foreach_ID_link(Main *bmain,
 
           library_foreach_idproperty_ID_link(&data, node->prop, IDWALK_CB_USER);
           for (sock = node->inputs.first; sock; sock = sock->next) {
-            library_foreach_idproperty_ID_link(&data, sock->prop, IDWALK_CB_USER);
+            library_foreach_node_socket(&data, sock);
           }
           for (sock = node->outputs.first; sock; sock = sock->next) {
-            library_foreach_idproperty_ID_link(&data, sock->prop, IDWALK_CB_USER);
+            library_foreach_node_socket(&data, sock);
           }
         }
 
         for (sock = ntree->inputs.first; sock; sock = sock->next) {
-          library_foreach_idproperty_ID_link(&data, sock->prop, IDWALK_CB_USER);
+          library_foreach_node_socket(&data, sock);
         }
         for (sock = ntree->outputs.first; sock; sock = sock->next) {
-          library_foreach_idproperty_ID_link(&data, sock->prop, IDWALK_CB_USER);
+          library_foreach_node_socket(&data, sock);
         }
         break;
       }

source/blender/blenkernel/intern/node.c

@@ -66,7 +66,9 @@
 
 #include "NOD_common.h"
 #include "NOD_composite.h"
+#include "NOD_function.h"
 #include "NOD_shader.h"
+#include "NOD_simulation.h"
 #include "NOD_socket.h"
 #include "NOD_texture.h"
 
@@ -400,6 +402,9 @@ static void node_socket_set_typeinfo(bNodeTree *ntree,
 
     /* deprecated integer type */
     sock->type = typeinfo->type;
+    sock->display_shape = typeinfo->display_shape_default;
+    sock->limit = (sock->in_out == SOCK_IN) ? typeinfo->input_link_limit :
+                                              typeinfo->output_link_limit;
 
     if (sock->default_value == NULL) {
       /* initialize the default_value pointer used by standard socket types */
@@ -755,6 +760,14 @@ void nodeModifySocketType(
   }
 
   if (sock->default_value) {
+    if (sock->type == SOCK_OBJECT) {
+      bNodeSocketValueObject *default_value = sock->default_value;
+      id_us_min(&default_value->object->id);
+    }
+    else if (sock->type == SOCK_IMAGE) {
+      bNodeSocketValueImage *default_value = sock->default_value;
+      id_us_min(&default_value->image->id);
+    }
     MEM_freeN(sock->default_value);
     sock->default_value = NULL;
   }
@@ -858,6 +871,20 @@ const char *nodeStaticSocketType(int type, int subtype)
       return "NodeSocketString";
     case SOCK_SHADER:
       return "NodeSocketShader";
+    case SOCK_EMITTERS:
+      return "NodeSocketEmitters";
+    case SOCK_EVENTS:
+      return "NodeSocketEvents";
+    case SOCK_FORCES:
+      return "NodeSocketForces";
+    case SOCK_CONTROL_FLOW:
+      return "NodeSocketControlFlow";
+    case SOCK_OBJECT:
+      return "NodeSocketObject";
+    case SOCK_IMAGE:
+      return "NodeSocketImage";
+    case SOCK_SURFACE_HOOK:
+      return "NodeSocketSurfaceHook";
   }
   return NULL;
 }
@@ -919,6 +946,20 @@ const char *nodeStaticSocketInterfaceType(int type, int subtype)
       return "NodeSocketInterfaceString";
     case SOCK_SHADER:
       return "NodeSocketInterfaceShader";
+    case SOCK_EMITTERS:
+      return "NodeSocketInterfaceEmitters";
+    case SOCK_EVENTS:
+      return "NodeSocketInterfaceEvents";
+    case SOCK_FORCES:
+      return "NodeSocketInterfaceForces";
+    case SOCK_CONTROL_FLOW:
+      return "NodeSocketInterfaceControlFlow";
+    case SOCK_OBJECT:
+      return "NodeSocketInterfaceObject";
+    case SOCK_IMAGE:
+      return "NodeSocketInterfaceImage";
+    case SOCK_SURFACE_HOOK:
+      return "NodeSocketInterfaceSurfaceHook";
   }
   return NULL;
 }
@@ -977,6 +1018,16 @@ static void node_socket_free(bNodeTree *UNUSED(ntree),
   }
 
   if (sock->default_value) {
+    if (do_id_user) {
+      if (sock->type == SOCK_OBJECT) {
+        bNodeSocketValueObject *default_value = sock->default_value;
+        id_us_min(&default_value->object->id);
+      }
+      else if (sock->type == SOCK_IMAGE) {
+        bNodeSocketValueImage *default_value = sock->default_value;
+        id_us_min(&default_value->image->id);
+      }
+    }
     MEM_freeN(sock->default_value);
   }
 }
@@ -1263,6 +1314,17 @@ static void node_socket_copy(bNodeSocket *sock_dst, const bNodeSocket *sock_src,
 
   if (sock_src->default_value) {
     sock_dst->default_value = MEM_dupallocN(sock_src->default_value);
+
+    if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+      if (sock_dst->type == SOCK_OBJECT) {
+        bNodeSocketValueObject *default_value = sock_dst->default_value;
+        id_us_plus(&default_value->object->id);
+      }
+      else if (sock_dst->type == SOCK_IMAGE) {
+        bNodeSocketValueImage *default_value = sock_dst->default_value;
+        id_us_plus(&default_value->image->id);
+      }
+    }
   }
 
   sock_dst->stack_index = 0;
@@ -2083,6 +2145,27 @@ void nodeRemoveNode(Main *bmain, bNodeTree *ntree, bNode *node, bool do_id_user)
     if (node->id) {
       id_us_min(node->id);
     }
+
+    LISTBASE_FOREACH (bNodeSocket *, sock, &node->inputs) {
+      if (sock->type == SOCK_OBJECT) {
+        bNodeSocketValueObject *default_value = sock->default_value;
+        id_us_min(&default_value->object->id);
+      }
+      else if (sock->type == SOCK_IMAGE) {
+        bNodeSocketValueImage *default_value = sock->default_value;
+        id_us_min(&default_value->image->id);
+      }
+    }
+    LISTBASE_FOREACH (bNodeSocket *, sock, &node->outputs) {
+      if (sock->type == SOCK_OBJECT) {
+        bNodeSocketValueObject *default_value = sock->default_value;
+        id_us_min(&default_value->object->id);
+      }
+      else if (sock->type == SOCK_IMAGE) {
+        bNodeSocketValueImage *default_value = sock->default_value;
+        id_us_min(&default_value->image->id);
+      }
+    }
   }
 
   /* Remove animation data. */
@@ -2109,6 +2192,15 @@ static void node_socket_interface_free(bNodeTree *UNUSED(ntree), bNodeSocket *so
   }
 
   if (sock->default_value) {
+    if (sock->type == SOCK_OBJECT) {
+      bNodeSocketValueObject *default_value = sock->default_value;
+      id_us_min(&default_value->object->id);
+    }
+    else if (sock->type == SOCK_IMAGE) {
+      bNodeSocketValueImage *default_value = sock->default_value;
+      id_us_min(&default_value->image->id);
+    }
+
     MEM_freeN(sock->default_value);
   }
 }
@@ -4114,6 +4206,47 @@ static void registerTextureNodes(void)
   register_node_type_tex_proc_distnoise();
 }
 
+static void registerSimulationNodes(void)
+{
+  register_node_type_sim_group();
+
+  register_node_type_sim_particle_simulation();
+  register_node_type_sim_force();
+  register_node_type_sim_set_particle_attribute();
+  register_node_type_sim_particle_birth_event();
+  register_node_type_sim_particle_time_step_event();
+  register_node_type_sim_execute_condition();
+  register_node_type_sim_multi_execute();
+  register_node_type_sim_particle_mesh_emitter();
+  register_node_type_sim_particle_mesh_collision_event();
+  register_node_type_sim_emit_particles();
+  register_node_type_sim_simulation_time();
+  register_node_type_sim_particle_attribute();
+}
+
+static void registerFunctionNodes(void)
+{
+  register_node_type_fn_combine_xyz();
+  register_node_type_fn_separate_xyz();
+  register_node_type_fn_combine_rgb();
+  register_node_type_fn_separate_rgb();
+  register_node_type_fn_combine_hsv();
+  register_node_type_fn_separate_hsv();
+  register_node_type_fn_float_math();
+  register_node_type_fn_vector_math();
+  register_node_type_fn_closest_surface();
+  register_node_type_fn_surface_color();
+  register_node_type_fn_surface_normal();
+  register_node_type_fn_surface_position();
+  register_node_type_fn_surface_weight();
+  register_node_type_fn_boolean_math();
+  register_node_type_fn_float_compare();
+  register_node_type_fn_instance_identifier();
+  register_node_type_fn_string_concatenation();
+  register_node_type_fn_object_transforms();
+  register_node_type_fn_switch();
+}
+
 void init_nodesystem(void)
 {
   nodetreetypes_hash = BLI_ghash_str_new("nodetreetypes_hash gh");
@@ -4127,6 +4260,7 @@ void init_nodesystem(void)
   register_node_tree_type_cmp();
   register_node_tree_type_sh();
   register_node_tree_type_tex();
+  register_node_tree_type_sim();
 
   register_node_type_frame();
   register_node_type_reroute();
@@ -4136,6 +4270,8 @@ void init_nodesystem(void)
   registerCompositNodes();
   registerShaderNodes();
   registerTextureNodes();
+  registerSimulationNodes();
+  registerFunctionNodes();
 }
 
 void free_nodesystem(void)

source/blender/blenkernel/intern/shrinkwrap.c

@@ -721,7 +721,7 @@ static void shrinkwrap_calc_normal_projection(ShrinkwrapCalcData *calc)
 /*
  * Shrinkwrap Target Surface Project mode
  *
- * It uses Newton's method to find a surface location with its
+ * It uses Newton's method to find a Surface Hook with its
  * smooth normal pointing at the original point.
  *
  * The equation system on barycentric weights and normal multiplier:

source/blender/blenkernel/intern/surface_hook.cc

@@ -0,0 +1,7 @@
+#include "BKE_surface_hook.h"
+
+#include "BLI_hash.h"
+
+namespace BKE {
+
+}  // namespace BKE

source/blender/blenkernel/intern/virtual_node_tree.cc

@@ -0,0 +1,115 @@
+#include "BKE_virtual_node_tree.h"
+
+#include "BLI_listbase_wrapper.h"
+#include "BLI_map.h"
+
+namespace BKE {
+
+using BLI::Map;
+using BSocketList = BLI::IntrusiveListBaseWrapper<bNodeSocket>;
+using BNodeList = BLI::IntrusiveListBaseWrapper<bNode>;
+using BLinkList = BLI::IntrusiveListBaseWrapper<bNodeLink>;
+
+static bool is_reroute_node(const VNode &vnode)
+{
+  return vnode.idname() == "NodeReroute";
+}
+
+VirtualNodeTree::VirtualNodeTree(bNodeTree *btree) : m_btree(btree)
+{
+  BLI_assert(btree != nullptr);
+
+  VirtualNodeTree &vtree = *this;
+
+  Map<bNode *, VNode *> node_mapping;
+
+  for (bNode *bnode : BNodeList(btree->nodes)) {
+    VNode &vnode = *vtree.m_allocator.construct<VNode>();
+
+    vnode.m_vtree = &vtree;
+    vnode.m_bnode = bnode;
+    vnode.m_id = vtree.m_nodes_by_id.append_and_get_index(&vnode);
+    RNA_pointer_create(&btree->id, &RNA_Node, bnode, &vnode.m_rna);
+
+    for (bNodeSocket *bsocket : BSocketList(bnode->inputs)) {
+      VInputSocket &vsocket = *vtree.m_allocator.construct<VInputSocket>();
+
+      vsocket.m_node = &vnode;
+      vsocket.m_index = vnode.m_inputs.append_and_get_index(&vsocket, m_allocator);
+      vsocket.m_is_input = true;
+      vsocket.m_bsocket = bsocket;
+      vsocket.m_id = vtree.m_sockets_by_id.append_and_get_index(&vsocket);
+      RNA_pointer_create(&btree->id, &RNA_NodeSocket, bsocket, &vsocket.m_rna);
+
+      vtree.m_input_sockets.append(&vsocket);
+    }
+
+    for (bNodeSocket *bsocket : BSocketList(bnode->outputs)) {
+      VOutputSocket &vsocket = *vtree.m_allocator.construct<VOutputSocket>();
+
+      vsocket.m_node = &vnode;
+      vsocket.m_index = vnode.m_outputs.append_and_get_index(&vsocket, m_allocator);
+      vsocket.m_is_input = false;
+      vsocket.m_bsocket = bsocket;
+      vsocket.m_id = vtree.m_sockets_by_id.append_and_get_index(&vsocket);
+      RNA_pointer_create(&btree->id, &RNA_NodeSocket, bsocket, &vsocket.m_rna);
+
+      vtree.m_output_sockets.append(&vsocket);
+    }
+
+    node_mapping.add_new(bnode, &vnode);
+  }
+
+  for (bNodeLink *blink : BLinkList(btree->links)) {
+    VOutputSocket &from_vsocket =
+        *node_mapping.lookup(blink->fromnode)
+             ->m_outputs[BSocketList(blink->fromnode->outputs).index_of(blink->fromsock)];
+    VInputSocket &to_vsocket =
+        *node_mapping.lookup(blink->tonode)
+             ->m_inputs[BSocketList(blink->tonode->inputs).index_of(blink->tosock)];
+
+    from_vsocket.m_directly_linked_sockets.append(&to_vsocket, m_allocator);
+    to_vsocket.m_directly_linked_sockets.append(&from_vsocket, m_allocator);
+  }
+
+  for (VOutputSocket *socket : vtree.m_output_sockets) {
+    if (!is_reroute_node(socket->node())) {
+      vtree.find_targets_skipping_reroutes(*socket, socket->m_linked_sockets);
+      for (VSocket *target : socket->m_linked_sockets) {
+        target->m_linked_sockets.append(socket, m_allocator);
+      }
+    }
+  }
+
+  for (VNode *vnode : vtree.m_nodes_by_id) {
+    vtree.m_nodes_by_idname.add(vnode->idname(), vnode);
+  }
+}
+
+void VirtualNodeTree::find_targets_skipping_reroutes(VOutputSocket &vsocket,
+                                                     LinearAllocatedVector<VSocket *> &r_targets)
+{
+  for (VSocket *direct_target : vsocket.m_directly_linked_sockets) {
+    if (is_reroute_node(*direct_target->m_node)) {
+      this->find_targets_skipping_reroutes(*direct_target->m_node->m_outputs[0], r_targets);
+    }
+    else if (!r_targets.contains(direct_target)) {
+      r_targets.append(direct_target, m_allocator);
+    }
+  }
+}
+
+VirtualNodeTree::~VirtualNodeTree()
+{
+  for (VNode *node : m_nodes_by_id) {
+    node->~VNode();
+  }
+  for (VInputSocket *socket : m_input_sockets) {
+    socket->~VInputSocket();
+  }
+  for (VOutputSocket *socket : m_output_sockets) {
+    socket->~VOutputSocket();
+  }
+}
+
+};  // namespace BKE

source/blender/blenlib/BLI_buffer_cache.h

@@ -0,0 +1,83 @@
+#ifndef __BLI_BUFFER_ALLOCATOR_H__
+#define __BLI_BUFFER_ALLOCATOR_H__
+
+#include "BLI_vector.h"
+
+namespace BLI {
+
+class BufferCache {
+ private:
+  static const int Alignment = 64;
+
+  struct BufferHead {
+    uint buffer_size_in_bytes;
+
+    void *user_ptr()
+    {
+      BLI_STATIC_ASSERT(sizeof(BufferHead) <= Alignment, "");
+      return POINTER_OFFSET(this, Alignment);
+    }
+
+    static BufferHead *FromUserPtr(void *ptr)
+    {
+      return (BufferHead *)POINTER_OFFSET(ptr, -Alignment);
+    }
+  };
+
+  Vector<BufferHead *, 16> m_all_buffers;
+  Vector<BufferHead *, 16> m_cached_buffers;
+
+ public:
+  BufferCache() = default;
+
+  ~BufferCache()
+  {
+    assert_same_size(m_cached_buffers, m_all_buffers);
+
+    for (BufferHead *head : m_all_buffers) {
+      MEM_freeN((void *)head);
+    }
+  }
+
+  void *allocate(uint size, uint alignment)
+  {
+    UNUSED_VARS_NDEBUG(alignment);
+    BLI_assert(alignment <= Alignment);
+
+    /* Only use buffer sizes that are a power of two, to make them easier to reuse. */
+    uint padded_size = power_of_2_max_u(size);
+
+    /* Try to use a cached memory buffer. Start searching from the back to prefer buffers that have
+     * been used "just before". */
+    for (int i = m_cached_buffers.size() - 1; i >= 0; i--) {
+      BufferHead *head = m_cached_buffers[i];
+      if (head->buffer_size_in_bytes == padded_size) {
+        void *user_ptr = head->user_ptr();
+        m_cached_buffers.remove_and_reorder(i);
+        return user_ptr;
+      }
+    }
+
+    BufferHead *new_head = (BufferHead *)MEM_mallocN_aligned(
+        padded_size + Alignment, Alignment, "allocate in BufferCache");
+    new_head->buffer_size_in_bytes = padded_size;
+    m_all_buffers.append(new_head);
+    return new_head->user_ptr();
+  }
+
+  void deallocate(void *buffer)
+  {
+    BufferHead *head = BufferHead::FromUserPtr(buffer);
+    BLI_assert(m_all_buffers.contains(head));
+    m_cached_buffers.append(head);
+  }
+
+  void *allocate(uint element_amount, uint element_size, uint alignment)
+  {
+    return this->allocate(element_amount * element_size, alignment);
+  }
+};
+
+}  // namespace BLI
+
+#endif /* __BLI_BUFFER_ALLOCATOR_H__ */

source/blender/blenlib/BLI_color.h

@@ -0,0 +1,87 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __BLI_COLOR_H__
+#define __BLI_COLOR_H__
+
+#include <array>
+#include <iostream>
+
+#include "BLI_math_color.h"
+
+namespace BLI {
+
+struct rgba_f {
+  float r, g, b, a;
+
+  rgba_f() = default;
+
+  rgba_f(float r, float g, float b, float a) : r(r), g(g), b(b), a(a)
+  {
+  }
+
+  operator float *()
+  {
+    return &r;
+  }
+
+  operator std::array<float, 4>()
+  {
+    return {r, g, b, a};
+  }
+
+  friend std::ostream &operator<<(std::ostream &stream, rgba_f c)
+  {
+    stream << "(" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ")";
+    return stream;
+  }
+};
+
+struct rgba_b {
+  uint8_t r, g, b, a;
+
+  rgba_b() = default;
+
+  rgba_b(uint8_t r, uint8_t g, uint8_t b, uint8_t a) : r(r), g(g), b(b), a(a)
+  {
+  }
+
+  rgba_b(rgba_f other)
+  {
+    rgba_float_to_uchar(*this, other);
+  }
+
+  operator rgba_f() const
+  {
+    rgba_f result;
+    rgba_uchar_to_float(result, *this);
+    return result;
+  }
+
+  operator uint8_t *()
+  {
+    return &r;
+  }
+
+  operator const uint8_t *() const
+  {
+    return &r;
+  }
+};
+
+}  // namespace BLI
+
+#endif /* __BLI_COLOR_H__ */

source/blender/blenlib/BLI_dot_export.h

@@ -0,0 +1,274 @@
+#ifndef __BLI_DOT_EXPORT_H__
+#define __BLI_DOT_EXPORT_H__
+
+/**
+ * Language grammar: https://www.graphviz.org/doc/info/lang.html
+ * Attributes: https://www.graphviz.org/doc/info/attrs.html
+ * Node Shapes: https://www.graphviz.org/doc/info/shapes.html
+ * Preview: https://dreampuf.github.io/GraphvizOnline
+ */
+
+#include "BLI_map.h"
+#include "BLI_optional.h"
+#include "BLI_set.h"
+#include "BLI_string_map.h"
+#include "BLI_utility_mixins.h"
+#include "BLI_vector.h"
+
+#include "BLI_dot_export_attribute_enums.h"
+
+#include <sstream>
+
+namespace BLI {
+namespace DotExport {
+
+class Graph;
+class DirectedGraph;
+class UndirectedGraph;
+class Node;
+class NodePort;
+class DirectedEdge;
+class UndirectedEdge;
+class Cluster;
+class AttributeList;
+
+class AttributeList {
+ private:
+  Map<std::string, std::string> m_attributes;
+
+ public:
+  void export__as_bracket_list(std::stringstream &ss) const;
+
+  void set(StringRef key, StringRef value)
+  {
+    m_attributes.add_override(key, value);
+  }
+};
+
+class Graph {
+ private:
+  AttributeList m_attributes;
+  Vector<std::unique_ptr<Node>> m_nodes;
+  Vector<std::unique_ptr<Cluster>> m_clusters;
+
+  Set<Node *> m_top_level_nodes;
+  Set<Cluster *> m_top_level_clusters;
+
+  friend Cluster;
+  friend Node;
+
+ public:
+  Node &new_node(StringRef label);
+  Cluster &new_cluster(StringRef label = "");
+
+  void export__declare_nodes_and_clusters(std::stringstream &ss) const;
+
+  void set_attribute(StringRef key, StringRef value)
+  {
+    m_attributes.set(key, value);
+  }
+
+  void set_rankdir(Attr_rankdir::Enum rankdir)
+  {
+    this->set_attribute("rankdir", Attr_rankdir::to_string(rankdir));
+  }
+
+  void set_random_cluster_bgcolors();
+};
+
+class Cluster {
+ private:
+  AttributeList m_attributes;
+  Graph &m_graph;
+  Cluster *m_parent = nullptr;
+  Set<Cluster *> m_children;
+  Set<Node *> m_nodes;
+
+  friend Graph;
+  friend Node;
+
+  Cluster(Graph &graph) : m_graph(graph)
+  {
+  }
+
+ public:
+  void export__declare_nodes_and_clusters(std::stringstream &ss) const;
+
+  void set_attribute(StringRef key, StringRef value)
+  {
+    m_attributes.set(key, value);
+  }
+
+  void set_parent_cluster(Cluster *cluster);
+  void set_parent_cluster(Cluster &cluster)
+  {
+    this->set_parent_cluster(&cluster);
+  }
+
+  void set_random_cluster_bgcolors();
+};
+
+class Node {
+ private:
+  AttributeList m_attributes;
+  Graph &m_graph;
+  Cluster *m_cluster = nullptr;
+
+  friend Graph;
+
+  Node(Graph &graph) : m_graph(graph)
+  {
+  }
+
+ public:
+  const AttributeList &attributes() const
+  {
+    return m_attributes;
+  }
+
+  AttributeList &attributes()
+  {
+    return m_attributes;
+  }
+
+  void set_parent_cluster(Cluster *cluster);
+  void set_parent_cluster(Cluster &cluster)
+  {
+    this->set_parent_cluster(&cluster);
+  }
+
+  void set_attribute(StringRef key, StringRef value)
+  {
+    m_attributes.set(key, value);
+  }
+
+  void set_shape(Attr_shape::Enum shape)
+  {
+    this->set_attribute("shape", Attr_shape::to_string(shape));
+  }
+
+  /* See https://www.graphviz.org/doc/info/attrs.html#k:color. */
+  void set_background_color(StringRef name)
+  {
+    this->set_attribute("fillcolor", name);
+    this->set_attribute("style", "filled");
+  }
+
+  void export__as_id(std::stringstream &ss) const;
+
+  void export__as_declaration(std::stringstream &ss) const;
+};
+
+class UndirectedGraph final : public Graph {
+ private:
+  Vector<std::unique_ptr<UndirectedEdge>> m_edges;
+
+ public:
+  std::string to_dot_string() const;
+
+  UndirectedEdge &new_edge(NodePort a, NodePort b);
+};
+
+class DirectedGraph final : public Graph {
+ private:
+  Vector<std::unique_ptr<DirectedEdge>> m_edges;
+
+ public:
+  std::string to_dot_string() const;
+
+  DirectedEdge &new_edge(NodePort from, NodePort to);
+};
+
+class NodePort {
+ private:
+  Node *m_node;
+  Optional<std::string> m_port_name;
+
+ public:
+  NodePort(Node &node, Optional<std::string> port_name = {})
+      : m_node(&node), m_port_name(std::move(port_name))
+  {
+  }
+
+  void to_dot_string(std::stringstream &ss) const;
+};
+
+class Edge : BLI::NonCopyable, BLI::NonMovable {
+ protected:
+  AttributeList m_attributes;
+  NodePort m_a;
+  NodePort m_b;
+
+ public:
+  Edge(NodePort a, NodePort b) : m_a(std::move(a)), m_b(std::move(b))
+  {
+  }
+
+  void set_attribute(StringRef key, StringRef value)
+  {
+    m_attributes.set(key, value);
+  }
+
+  void set_arrowhead(Attr_arrowType::Enum type)
+  {
+    this->set_attribute("arrowhead", Attr_arrowType::to_string(type));
+  }
+
+  void set_arrowtail(Attr_arrowType::Enum type)
+  {
+    this->set_attribute("arrowtail", Attr_arrowType::to_string(type));
+  }
+
+  void set_dir(Attr_dirType::Enum type)
+  {
+    this->set_attribute("dir", Attr_dirType::to_string(type));
+  }
+};
+
+class DirectedEdge : public Edge {
+ public:
+  DirectedEdge(NodePort from, NodePort to) : Edge(std::move(from), std::move(to))
+  {
+  }
+
+  void export__as_edge_statement(std::stringstream &ss) const;
+};
+
+class UndirectedEdge : public Edge {
+ public:
+  UndirectedEdge(NodePort a, NodePort b) : Edge(std::move(a), std::move(b))
+  {
+  }
+
+  void export__as_edge_statement(std::stringstream &ss) const;
+};
+
+std::string color_attr_from_hsv(float h, float s, float v);
+
+class NodeWithSocketsRef {
+ private:
+  Node *m_node;
+
+ public:
+  NodeWithSocketsRef(Node &node,
+                     StringRef name,
+                     ArrayRef<std::string> input_names,
+                     ArrayRef<std::string> output_names);
+
+  NodePort input(uint index) const
+  {
+    std::string port = "\"in" + std::to_string(index) + "\"";
+    return NodePort(*m_node, port);
+  }
+
+  NodePort output(uint index) const
+  {
+    std::string port = "\"out" + std::to_string(index) + "\"";
+    return NodePort(*m_node, port);
+  }
+};
+
+}  // namespace DotExport
+}  // namespace BLI
+
+#endif /* __BLI_DOT_EXPORT_H__ */

source/blender/blenlib/BLI_dot_export_attribute_enums.h

@@ -0,0 +1,112 @@
+#ifndef __BLI_DOT_EXPORT_ATTRIBUTE_ENUMS_H__
+#define __BLI_DOT_EXPORT_ATTRIBUTE_ENUMS_H__
+
+#include "BLI_string_ref.h"
+
+namespace BLI {
+namespace DotExport {
+
+namespace Attr_rankdir {
+enum Enum {
+  LeftToRight,
+  TopToBottom,
+};
+
+static StringRef to_string(Enum value)
+{
+  switch (value) {
+    case LeftToRight:
+      return "LR";
+    case TopToBottom:
+      return "TB";
+  }
+  return "";
+}
+}  // namespace Attr_rankdir
+
+namespace Attr_shape {
+enum Enum {
+  Rectangle,
+  Ellipse,
+  Circle,
+  Point,
+  Diamond,
+  Square,
+};
+
+static StringRef to_string(Enum value)
+{
+  switch (value) {
+    case Rectangle:
+      return "rectangle";
+    case Ellipse:
+      return "ellipse";
+    case Circle:
+      return "circle";
+    case Point:
+      return "point";
+    case Diamond:
+      return "diamond";
+    case Square:
+      return "square";
+  }
+  return "";
+}
+}  // namespace Attr_shape
+
+namespace Attr_arrowType {
+enum Enum {
+  Normal,
+  Inv,
+  Dot,
+  None,
+  Empty,
+  Box,
+  Vee,
+};
+
+static StringRef to_string(Enum value)
+{
+  switch (value) {
+    case Normal:
+      return "normal";
+    case Inv:
+      return "inv";
+    case Dot:
+      return "dot";
+    case None:
+      return "none";
+    case Empty:
+      return "empty";
+    case Box:
+      return "box";
+    case Vee:
+      return "vee";
+  }
+  return "";
+}
+}  // namespace Attr_arrowType
+
+namespace Attr_dirType {
+enum Enum { Forward, Back, Both, None };
+
+static StringRef to_string(Enum value)
+{
+  switch (value) {
+    case Forward:
+      return "forward";
+    case Back:
+      return "back";
+    case Both:
+      return "both";
+    case None:
+      return "none";
+  }
+  return "";
+}
+}  // namespace Attr_dirType
+
+}  // namespace DotExport
+}  // namespace BLI
+
+#endif /* __BLI_DOT_EXPORT_ATTRIBUTE_ENUMS_H__ */

source/blender/blenlib/BLI_float2.h

@@ -0,0 +1,90 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __BLI_FLOAT2_H__
+#define __BLI_FLOAT2_H__
+
+#include "BLI_float3.h"
+
+namespace BLI {
+
+struct float2 {
+  float x, y;
+
+  float2() = default;
+
+  float2(const float *ptr) : x{ptr[0]}, y{ptr[1]}
+  {
+  }
+
+  float2(float x, float y) : x(x), y(y)
+  {
+  }
+
+  float2(float3 other) : x(other.x), y(other.y)
+  {
+  }
+
+  operator float *()
+  {
+    return &x;
+  }
+
+  float2 clamped(float min, float max)
+  {
+    return {std::min(std::max(x, min), max), std::min(std::max(y, min), max)};
+  }
+
+  float2 clamped_01()
+  {
+    return this->clamped(0, 1);
+  }
+
+  friend float2 operator+(float2 a, float2 b)
+  {
+    return {a.x + b.x, a.y + b.y};
+  }
+
+  friend float2 operator-(float2 a, float2 b)
+  {
+    return {a.x - b.x, a.y - b.y};
+  }
+
+  friend float2 operator*(float2 a, float b)
+  {
+    return {a.x * b, a.y * b};
+  }
+
+  friend float2 operator/(float2 a, float b)
+  {
+    return {a.x / b, a.y / b};
+  }
+
+  friend float2 operator*(float a, float2 b)
+  {
+    return b * a;
+  }
+
+  friend std::ostream &operator<<(std::ostream &stream, float2 v)
+  {
+    stream << "(" << v.x << ", " << v.y << ")";
+    return stream;
+  }
+};
+
+}  // namespace BLI
+
+#endif /* __BLI_FLOAT2_H__ */

source/blender/blenlib/BLI_float3.h

@@ -0,0 +1,229 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __BLI_FLOAT3_H__
+#define __BLI_FLOAT3_H__
+
+#include <array>
+#include <iostream>
+
+#include "BLI_math_vector.h"
+
+namespace BLI {
+struct float3 {
+  float x, y, z;
+
+  float3() = default;
+
+  float3(const float *ptr) : x{ptr[0]}, y{ptr[1]}, z{ptr[2]}
+  {
+  }
+
+  explicit float3(float value) : x(value), y(value), z(value)
+  {
+  }
+
+  explicit float3(int value) : x(value), y(value), z(value)
+  {
+  }
+
+  float3(float x, float y, float z) : x{x}, y{y}, z{z}
+  {
+  }
+
+  operator const float *() const
+  {
+    return (const float *)this;
+  }
+
+  operator float *()
+  {
+    return (float *)this;
+  }
+
+  operator std::array<float, 3>()
+  {
+    return {x, y, z};
+  }
+
+  float normalize_and_get_length()
+  {
+    return normalize_v3(*this);
+  }
+
+  float3 normalized() const
+  {
+    float3 result;
+    normalize_v3_v3(result, *this);
+    return result;
+  }
+
+  float length() const
+  {
+    return len_v3(*this);
+  }
+
+  float length_squared() const
+  {
+    return len_squared_v3(*this);
+  }
+
+  void reflect(float3 normal)
+  {
+    *this = this->reflected(normal);
+  }
+
+  float3 reflected(float3 normal) const
+  {
+    float3 result;
+    reflect_v3_v3v3(result, *this, normal);
+    return result;
+  }
+
+  static float3 safe_divide(const float3 a, const float3 b)
+  {
+    float3 result;
+    result.x = (b.x == 0.0f) ? 0.0f : a.x / b.x;
+    result.y = (b.y == 0.0f) ? 0.0f : a.y / b.y;
+    result.z = (b.z == 0.0f) ? 0.0f : a.z / b.z;
+    return result;
+  }
+
+  void invert()
+  {
+    x = -x;
+    y = -y;
+    z = -z;
+  }
+
+  bool is_zero() const
+  {
+    return x != 0.0f && y != 0.0f && z != 0.0f;
+  }
+
+  friend float3 operator+(float3 a, float3 b)
+  {
+    return {a.x + b.x, a.y + b.y, a.z + b.z};
+  }
+
+  void operator+=(float3 b)
+  {
+    this->x += b.x;
+    this->y += b.y;
+    this->z += b.z;
+  }
+
+  friend float3 operator-(float3 a, float3 b)
+  {
+    return {a.x - b.x, a.y - b.y, a.z - b.z};
+  }
+
+  friend float3 operator-(float3 a)
+  {
+    return {-a.x, -a.y, -a.z};
+  }
+
+  void operator-=(float3 b)
+  {
+    this->x -= b.x;
+    this->y -= b.y;
+    this->z -= b.z;
+  }
+
+  void operator*=(float scalar)
+  {
+    this->x *= scalar;
+    this->y *= scalar;
+    this->z *= scalar;
+  }
+
+  void operator*=(float3 other)
+  {
+    this->x *= other.x;
+    this->y *= other.y;
+    this->z *= other.z;
+  }
+
+  friend float3 operator*(float3 a, float3 b)
+  {
+    return {a.x * b.x, a.y * b.y, a.z * b.z};
+  }
+
+  friend float3 operator*(float3 a, float b)
+  {
+    return {a.x * b, a.y * b, a.z * b};
+  }
+
+  friend float3 operator*(float a, float3 b)
+  {
+    return b * a;
+  }
+
+  friend float3 operator/(float3 a, float3 b)
+  {
+    BLI_assert(!b.is_zero());
+    return {a.x / b.x, a.y / b.y, a.z / b.z};
+  }
+
+  friend float3 operator/(float3 a, float b)
+  {
+    BLI_assert(b != 0);
+    return {a.x / b, a.y / b, a.z / b};
+  }
+
+  friend std::ostream &operator<<(std::ostream &stream, float3 v)
+  {
+    stream << "(" << v.x << ", " << v.y << ", " << v.z << ")";
+    return stream;
+  }
+
+  static float dot(float3 a, float3 b)
+  {
+    return a.x * b.x + a.y * b.y + a.z * b.z;
+  }
+
+  static float3 cross_high_precision(float3 a, float3 b)
+  {
+    float3 result;
+    cross_v3_v3v3_hi_prec(result, a, b);
+    return result;
+  }
+
+  static float3 project(float3 a, float3 b)
+  {
+    float3 result;
+    project_v3_v3v3(result, a, b);
+    return result;
+  }
+
+  static float distance(float3 a, float3 b)
+  {
+    return (a - b).length();
+  }
+
+  static float distance_squared(float3 a, float3 b)
+  {
+    return float3::dot(a, b);
+  }
+
+  static float3 interpolate(float3 a, float3 b, float t)
+  {
+    return a * (1 - t) + b * t;
+  }
+};
+}  // namespace BLI
+
+#endif /* __BLI_FLOAT3_H__ */

source/blender/blenlib/BLI_float4x4.h

@@ -0,0 +1,103 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __BLI_FLOAT4X4_H__
+#define __BLI_FLOAT4X4_H__
+
+#include "BLI_array_ref.h"
+#include "BLI_float3.h"
+#include "BLI_math_matrix.h"
+
+namespace BLI {
+
+struct float4x4 {
+  float values[4][4];
+
+  float4x4() = default;
+
+  float4x4(float *matrix)
+  {
+    memcpy(values, matrix, sizeof(float) * 16);
+  }
+
+  float4x4(float matrix[4][4]) : float4x4((float *)matrix)
+  {
+  }
+
+  operator float *()
+  {
+    return (float *)this;
+  }
+
+  float4x4 inverted() const
+  {
+    float result[4][4];
+    invert_m4_m4(result, values);
+    return result;
+  }
+
+  float4x4 inverted__LocRotScale() const
+  {
+    return this->inverted();
+  }
+
+  float3 transform_position(float3 position) const
+  {
+    mul_m4_v3(values, position);
+    return position;
+  }
+
+  float3 transform_direction(float3 direction) const
+  {
+    mul_mat3_m4_v3(values, direction);
+    return direction;
+  }
+
+  static void transform_positions(ArrayRef<float4x4> matrices,
+                                  ArrayRef<float3> positions,
+                                  MutableArrayRef<float3> r_results)
+  {
+    uint amount = matrices.size();
+    BLI_assert(amount == positions.size());
+    BLI_assert(amount == r_results.size());
+    for (uint i = 0; i < amount; i++) {
+      r_results[i] = matrices[i].transform_position(positions[i]);
+    }
+  }
+
+  static void transform_directions(ArrayRef<float4x4> matrices,
+                                   ArrayRef<float3> directions,
+                                   MutableArrayRef<float3> r_results)
+  {
+    uint amount = matrices.size();
+    BLI_assert(amount == directions.size());
+    BLI_assert(amount == r_results.size());
+    for (uint i = 0; i < amount; i++) {
+      r_results[i] = matrices[i].transform_direction(directions[i]);
+    }
+  }
+
+  static float4x4 interpolate(float4x4 a, float4x4 b, float t)
+  {
+    float result[4][4];
+    interp_m4_m4m4(result, a.values, b.values, t);
+    return result;
+  }
+};
+
+}  // namespace BLI
+
+#endif /* __BLI_FLOAT4X4_H__ */

source/blender/blenlib/BLI_float_interval.h

@@ -0,0 +1,94 @@
+#ifndef __BLI_TIME_SPAN_H__
+#define __BLI_TIME_SPAN_H__
+
+#include "BLI_array_ref.h"
+
+namespace BLI {
+
+class FloatInterval {
+ private:
+  float m_start;
+  float m_size;
+
+ public:
+  FloatInterval(float start, float size) : m_start(start), m_size(size)
+  {
+    BLI_assert(size >= 0.0f);
+  }
+
+  float start() const
+  {
+    return m_start;
+  }
+
+  float size() const
+  {
+    return m_size;
+  }
+
+  float end() const
+  {
+    return m_start + m_size;
+  }
+
+  float value_at(float factor) const
+  {
+    return m_start + factor * m_size;
+  }
+
+  void value_at(ArrayRef<float> factors, MutableArrayRef<float> r_values)
+  {
+    assert_same_size(factors, r_values);
+    for (uint i : factors.index_range()) {
+      r_values[i] = this->value_at(factors[i]);
+    }
+  }
+
+  void sample_linear(MutableArrayRef<float> r_values)
+  {
+    if (r_values.size() == 0) {
+      return;
+    }
+    if (r_values.size() == 1) {
+      r_values[0] = this->value_at(0.5f);
+    }
+    for (uint i : r_values.index_range()) {
+      float factor = (i - 1) / (float)r_values.size();
+      r_values[i] = this->value_at(factor);
+    }
+  }
+
+  float factor_of(float value) const
+  {
+    BLI_assert(m_size > 0.0f);
+    return (value - m_start) / m_size;
+  }
+
+  float safe_factor_of(float value) const
+  {
+    if (m_size > 0.0f) {
+      return this->factor_of(value);
+    }
+    else {
+      return 0.0f;
+    }
+  }
+
+  void uniform_sample_range(float samples_per_time,
+                            float &r_factor_start,
+                            float &r_factor_step) const
+  {
+    if (m_size == 0.0f) {
+      /* Just needs to be greater than one. */
+      r_factor_start = 2.0f;
+      return;
+    }
+    r_factor_step = 1 / (m_size * samples_per_time);
+    float time_start = std::ceil(m_start * samples_per_time) / samples_per_time;
+    r_factor_start = this->safe_factor_of(time_start);
+  }
+};
+
+}  // namespace BLI
+
+#endif /* __BLI_TIME_SPAN_H__ */

source/blender/blenlib/BLI_index_mask.h

@@ -0,0 +1,118 @@
+#ifndef __BLI_INDEX_MASK_H__
+#define __BLI_INDEX_MASK_H__
+
+#include "BLI_array_ref.h"
+#include "BLI_index_range.h"
+#include "BLI_vector.h"
+#include "BLI_vector_adaptor.h"
+
+namespace BLI {
+
+class IndexMask {
+ private:
+  ArrayRef<uint> m_indices;
+
+ public:
+  IndexMask() = default;
+
+  IndexMask(ArrayRef<uint> indices) : m_indices(indices)
+  {
+#ifdef DEBUG
+    for (uint i = 1; i < indices.size(); i++) {
+      BLI_assert(indices[i - 1] < indices[i]);
+    }
+#endif
+  }
+
+  IndexMask(IndexRange range) : m_indices(range.as_array_ref())
+  {
+  }
+
+  template<uint N, typename Allocator>
+  IndexMask(const Vector<uint, N, Allocator> &vector) : IndexMask(vector.as_ref())
+  {
+  }
+
+  IndexMask(const VectorAdaptor<uint> &vector) : IndexMask(ArrayRef<uint>(vector))
+  {
+  }
+
+  explicit IndexMask(uint n) : IndexMask(IndexRange(n))
+  {
+  }
+
+  operator ArrayRef<uint>() const
+  {
+    return m_indices;
+  }
+
+  const uint *begin() const
+  {
+    return m_indices.begin();
+  }
+
+  const uint *end() const
+  {
+    return m_indices.end();
+  }
+
+  uint operator[](uint index) const
+  {
+    return m_indices[index];
+  }
+
+  uint size() const
+  {
+    return m_indices.size();
+  }
+
+  uint min_array_size() const
+  {
+    return (m_indices.size() == 0) ? 0 : m_indices.last() + 1;
+  }
+
+  ArrayRef<uint> indices() const
+  {
+    return m_indices;
+  }
+
+  bool is_range() const
+  {
+    return m_indices.size() > 0 && m_indices.last() - m_indices.first() == m_indices.size() - 1;
+  }
+
+  IndexRange as_range() const
+  {
+    BLI_assert(this->is_range());
+    return IndexRange{m_indices.first(), m_indices.size()};
+  }
+
+  template<typename FuncT> void foreach_index(const FuncT &func) const
+  {
+    if (this->is_range()) {
+      IndexRange range = this->as_range();
+      for (uint i : range) {
+        func(i);
+      }
+    }
+    else {
+      for (uint i : m_indices) {
+        func(i);
+      }
+    }
+  }
+
+  IndexRange index_range() const
+  {
+    return m_indices.index_range();
+  }
+
+  uint last() const
+  {
+    return m_indices.last();
+  }
+};
+
+}  // namespace BLI
+
+#endif /* __BLI_INDEX_MASK_H__ */

source/blender/blenlib/BLI_index_to_ref_map.h

@@ -0,0 +1,121 @@
+#ifndef __BLI_INDEX_TO_REF_MAP_H__
+#define __BLI_INDEX_TO_REF_MAP_H__
+
+#include "BLI_array_cxx.h"
+#include "BLI_multi_map.h"
+
+namespace BLI {
+
+template<typename T, uint N = 4, typename Allocator = GuardedAllocator> class IndexToRefMap {
+ private:
+  Array<T *, N, Allocator> m_array;
+
+ public:
+  IndexToRefMap(uint size) : m_array(size, nullptr)
+  {
+  }
+
+  uint size() const
+  {
+    return m_array.size();
+  }
+
+  void add(uint key, T &value)
+  {
+    m_array[key] = &value;
+  }
+
+  void add_new(uint key, T &value)
+  {
+    BLI_assert(m_array[key] == nullptr);
+    m_array[key] = &value;
+  }
+
+  bool contains(uint key) const
+  {
+    return m_array[key] != nullptr;
+  }
+
+  const T &lookup(uint key) const
+  {
+    BLI_assert(this->contains(key));
+    return *m_array[key];
+  }
+
+  T &lookup(uint key)
+  {
+    BLI_assert(this->contains(key));
+    return *m_array[key];
+  }
+};
+
+#define IndexToRefMultiMap_UNMAPPED nullptr
+#define IndexToRefMultiMap_MULTIMAPPED ((T *)1)
+
+template<typename T, uint N = 4, typename Allocator = GuardedAllocator> class IndexToRefMultiMap {
+ private:
+  Array<T *> m_array;
+  MultiMap<uint, T *> m_fallback_multimap;
+
+ public:
+  IndexToRefMultiMap(uint max_index) : m_array(max_index, IndexToRefMultiMap_UNMAPPED)
+  {
+  }
+
+  uint max_index() const
+  {
+    return m_array.size();
+  }
+
+  bool contains(uint key) const
+  {
+    return m_array[key] != IndexToRefMultiMap_UNMAPPED;
+  }
+
+  ArrayRef<T *> lookup(uint key) const
+  {
+    T *const *stored_value_addr = &m_array[key];
+    const T *stored_value = *stored_value_addr;
+    if (stored_value == IndexToRefMultiMap_UNMAPPED) {
+      return {};
+    }
+    else if (stored_value == IndexToRefMultiMap_MULTIMAPPED) {
+      return m_fallback_multimap.lookup(key);
+    }
+    else {
+      return ArrayRef<T *>(stored_value_addr, 1);
+    }
+  }
+
+  T &lookup_single(uint key)
+  {
+    T *stored_value = m_array[key];
+    BLI_assert(stored_value != IndexToRefMultiMap_UNMAPPED &&
+               stored_value != IndexToRefMultiMap_MULTIMAPPED);
+    return *stored_value;
+  }
+
+  void add(uint key, T &value)
+  {
+    T **stored_value_addr = &m_array[key];
+    T *stored_value = *stored_value_addr;
+    if (stored_value == IndexToRefMultiMap_UNMAPPED) {
+      *stored_value_addr = &value;
+    }
+    else if (stored_value == IndexToRefMultiMap_MULTIMAPPED) {
+      m_fallback_multimap.add(key, &value);
+    }
+    else {
+      T *other_value = stored_value;
+      *stored_value_addr = IndexToRefMultiMap_MULTIMAPPED;
+      m_fallback_multimap.add_multiple_new(key, {other_value, &value});
+    }
+  }
+};
+
+#undef IndexToRefMultiMap_UNMAPPED
+#undef IndexToRefMultiMap_MULTIMAPPED
+
+}  // namespace BLI
+
+#endif /* __BLI_INDEX_TO_REF_MAP_H__ */

source/blender/blenlib/BLI_linear_allocated_vector.h

@@ -0,0 +1,230 @@
+#pragma once
+
+#include "BLI_index_range.h"
+#include "BLI_linear_allocator.h"
+#include "BLI_memory_utils_cxx.h"
+
+namespace BLI {
+
+template<typename T> class LinearAllocatedVector : BLI::NonCopyable {
+ private:
+  T *m_begin;
+  T *m_end;
+  T *m_capacity_end;
+
+#ifdef DEBUG
+  uint m_debug_size;
+#  define UPDATE_VECTOR_SIZE(ptr) (ptr)->m_debug_size = (ptr)->m_end - (ptr)->m_begin
+#else
+#  define UPDATE_VECTOR_SIZE(ptr) ((void)0)
+#endif
+
+ public:
+  LinearAllocatedVector() : m_begin(nullptr), m_end(nullptr), m_capacity_end(nullptr)
+  {
+    UPDATE_VECTOR_SIZE(this);
+  }
+
+  ~LinearAllocatedVector()
+  {
+    destruct_n(m_begin, this->size());
+  }
+
+  LinearAllocatedVector(LinearAllocatedVector &&other)
+  {
+    m_begin = other.m_begin;
+    m_end = other.m_end;
+    m_capacity_end = other.m_capacity_end;
+
+    other.m_begin = nullptr;
+    other.m_end = nullptr;
+    other.m_capacity_end = nullptr;
+
+    UPDATE_VECTOR_SIZE(this);
+    UPDATE_VECTOR_SIZE(&other);
+  }
+
+  LinearAllocatedVector &operator=(LinearAllocatedVector &&other)
+  {
+    if (this == &other) {
+      return *this;
+    }
+
+    m_begin = other.m_begin;
+    m_end = other.m_end;
+    m_capacity_end = other.m_capacity_end;
+
+    other.m_begin = nullptr;
+    other.m_end = nullptr;
+    other.m_capacity_end = nullptr;
+
+    UPDATE_VECTOR_SIZE(this);
+    UPDATE_VECTOR_SIZE(&other);
+
+    return *this;
+  }
+
+  operator ArrayRef<T>() const
+  {
+    return ArrayRef<T>(m_begin, this->size());
+  }
+
+  operator MutableArrayRef<T>()
+  {
+    return MutableArrayRef<T>(m_begin, this->size());
+  }
+
+  ArrayRef<T> as_ref() const
+  {
+    return *this;
+  }
+
+  MutableArrayRef<T> as_mutable_ref() const
+  {
+    return *this;
+  }
+
+  IndexRange index_range() const
+  {
+    return IndexRange(this->size());
+  }
+
+  uint size() const
+  {
+    return m_end - m_begin;
+  }
+
+  uint capacity() const
+  {
+    return m_capacity_end - m_begin;
+  }
+
+  void clear()
+  {
+    destruct_n(m_begin, this->size());
+    m_end = m_begin;
+    UPDATE_VECTOR_SIZE(this);
+  }
+
+  void append_unchecked(const T &value)
+  {
+    BLI_assert(m_end < m_capacity_end);
+    new (m_end) T(value);
+    m_end++;
+    UPDATE_VECTOR_SIZE(this);
+  }
+
+  template<typename AllocT> void append(const T &value, LinearAllocator<AllocT> &allocator)
+  {
+    if (m_end == m_capacity_end) {
+      this->grow(this->size() + 1, allocator);
+    }
+    this->append_unchecked(value);
+  }
+
+  template<typename AllocT>
+  uint append_and_get_index(const T &value, LinearAllocator<AllocT> &allocator)
+  {
+    uint index = this->size();
+    this->append(value, allocator);
+    return index;
+  }
+
+  bool contains(const T &value) const
+  {
+    for (const T &current : *this) {
+      if (current == value) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  const T &operator[](uint index) const
+  {
+    BLI_assert(index < this->size());
+    return m_begin[index];
+  }
+
+  T &operator[](uint index)
+  {
+    BLI_assert(index < this->size());
+    return m_begin[index];
+  }
+
+  const T *begin() const
+  {
+    return m_begin;
+  }
+
+  const T *end() const
+  {
+    return m_end;
+  }
+
+  T *begin()
+  {
+    return m_begin;
+  }
+
+  T *end()
+  {
+    return m_end;
+  }
+
+  void remove_and_reorder(uint index)
+  {
+    BLI_assert(index < this->size());
+    T *element_to_remove = m_begin + index;
+    m_end--;
+    if (element_to_remove < m_end) {
+      *element_to_remove = std::move(*m_end);
+    }
+    destruct(m_end);
+    UPDATE_VECTOR_SIZE(this);
+  }
+
+  int index_try(const T &value) const
+  {
+    for (T *current = m_begin; current != m_end; current++) {
+      if (*current == value) {
+        return current - m_begin;
+      }
+    }
+    return -1;
+  }
+
+  uint index(const T &value) const
+  {
+    int index = this->index_try(value);
+    BLI_assert(index >= 0);
+    return (uint)index;
+  }
+
+  void remove_first_occurrence_and_reorder(const T &value)
+  {
+    uint index = this->index(value);
+    this->remove_and_reorder((uint)index);
+  }
+
+ private:
+  template<typename AllocT>
+  BLI_NOINLINE void grow(uint min_capacity, LinearAllocator<AllocT> &allocator)
+  {
+    if (min_capacity <= this->capacity()) {
+      return;
+    }
+
+    uint size = this->size();
+    min_capacity = power_of_2_max_u(min_capacity);
+
+    T *new_begin = (T *)allocator.allocate(sizeof(T) * min_capacity, alignof(T));
+    uninitialized_relocate_n(m_begin, size, new_begin);
+
+    m_begin = new_begin;
+    m_end = new_begin + size;
+    m_capacity_end = new_begin + min_capacity;
+  }
+};
+
+}  // namespace BLI

source/blender/blenlib/BLI_linear_allocator.h

@@ -0,0 +1,172 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/** \file
+ * \ingroup bli
+ *
+ * A linear allocator is the simplest form of an allocator. It never reuses any memory, and
+ * therefore does not need a deallocation method. It simply hands out consecutive buffers of
+ * memory. When the current buffer is full, it reallocates a new larger buffer and continues.
+ */
+
+#pragma once
+
+#include "BLI_stack_cxx.h"
+#include "BLI_string_ref.h"
+#include "BLI_timeit.h"
+#include "BLI_utility_mixins.h"
+#include "BLI_vector.h"
+
+namespace BLI {
+
+template<typename Allocator = GuardedAllocator> class LinearAllocator : NonCopyable, NonMovable {
+ private:
+  Allocator m_allocator;
+  Vector<void *> m_owned_buffers;
+  Vector<ArrayRef<char>> m_unused_borrowed_buffers;
+
+  uintptr_t m_current_begin;
+  uintptr_t m_current_end;
+  uint m_next_min_alloc_size;
+
+#ifdef DEBUG
+  uint m_debug_allocated_amount = 0;
+#endif
+
+ public:
+  LinearAllocator()
+  {
+    m_current_begin = 0;
+    m_current_end = 0;
+    m_next_min_alloc_size = 64;
+  }
+
+  ~LinearAllocator()
+  {
+    for (void *ptr : m_owned_buffers) {
+      m_allocator.deallocate(ptr);
+    }
+  }
+
+  void provide_buffer(void *buffer, uint size)
+  {
+    m_unused_borrowed_buffers.append(ArrayRef<char>((char *)buffer, size));
+  }
+
+  template<uint Size, uint Alignment>
+  void provide_buffer(AlignedBuffer<Size, Alignment> &aligned_buffer)
+  {
+    this->provide_buffer(aligned_buffer.ptr(), Size);
+  }
+
+  template<typename T> T *allocate()
+  {
+    return (T *)this->allocate(sizeof(T), alignof(T));
+  }
+
+  template<typename T> MutableArrayRef<T> allocate_array(uint length)
+  {
+    return MutableArrayRef<T>((T *)this->allocate(sizeof(T) * length), length);
+  }
+
+  void *allocate(uint size, uint alignment = 4)
+  {
+    BLI_assert(alignment >= 1);
+    BLI_assert(is_power_of_2_i(alignment));
+
+#ifdef DEBUG
+    m_debug_allocated_amount += size;
+#endif
+
+    uintptr_t alignment_mask = alignment - 1;
+    uintptr_t potential_allocation_begin = (m_current_begin + alignment_mask) & ~alignment_mask;
+    uintptr_t potential_allocation_end = potential_allocation_begin + size;
+
+    if (potential_allocation_end <= m_current_end) {
+      m_current_begin = potential_allocation_end;
+      return (void *)potential_allocation_begin;
+    }
+    else {
+      this->allocate_new_buffer(size + alignment);
+      return this->allocate(size, alignment);
+    }
+  };
+
+  StringRefNull copy_string(StringRef str)
+  {
+    uint alloc_size = str.size() + 1;
+    char *buffer = (char *)this->allocate(alloc_size, 1);
+    str.copy(buffer, alloc_size);
+    return StringRefNull((const char *)buffer);
+  }
+
+  template<typename T, typename... Args> T *construct(Args &&... args)
+  {
+    void *buffer = this->allocate(sizeof(T), alignof(T));
+    T *value = new (buffer) T(std::forward<Args>(args)...);
+    return value;
+  }
+
+  template<typename T, typename... Args>
+  ArrayRef<T *> construct_elements_and_pointer_array(uint n, Args &&... args)
+  {
+    void *pointer_buffer = this->allocate(n * sizeof(T *), alignof(T *));
+    void *element_buffer = this->allocate(n * sizeof(T), alignof(T));
+
+    MutableArrayRef<T *> pointers((T **)pointer_buffer, n);
+    T *elements = (T *)element_buffer;
+
+    for (uint i : IndexRange(n)) {
+      pointers[i] = elements + i;
+    }
+    for (uint i : IndexRange(n)) {
+      new (elements + i) T(std::forward<Args>(args)...);
+    }
+
+    return pointers;
+  }
+
+  template<typename T> MutableArrayRef<T> construct_array_copy(ArrayRef<T> source)
+  {
+    T *buffer = (T *)this->allocate(source.byte_size(), alignof(T));
+    source.copy_to(buffer);
+    return MutableArrayRef<T>(buffer, source.size());
+  }
+
+ private:
+  void allocate_new_buffer(uint min_allocation_size)
+  {
+    for (uint i : m_unused_borrowed_buffers.index_range()) {
+      ArrayRef<char> buffer = m_unused_borrowed_buffers[i];
+      if (buffer.size() >= min_allocation_size) {
+        m_unused_borrowed_buffers.remove_and_reorder(i);
+        m_current_begin = (uintptr_t)buffer.begin();
+        m_current_end = (uintptr_t)buffer.end();
+        return;
+      }
+    }
+
+    uint size_in_bytes = power_of_2_min_u(std::max(min_allocation_size, m_next_min_alloc_size));
+    m_next_min_alloc_size = size_in_bytes * 2;
+
+    void *buffer = m_allocator.allocate(size_in_bytes, __func__);
+    m_owned_buffers.append(buffer);
+    m_current_begin = (uintptr_t)buffer;
+    m_current_end = m_current_begin + size_in_bytes;
+  }
+};
+
+}  // namespace BLI