Merge branch 'geometry-nodes' into geometry-nodes-transform-node

We might not want to have all those nodes in a final version.
Some of them have been added with particle nodes in mind.
However, to test the evaluation system it is useful to have a
couple of nodes available.

Those nodes should "just" work, because their implementation
is reused from the particle nodes project.

release/scripts/startup/bl_operators/__init__.py

@@ -31,6 +31,7 @@ _modules = [
     "console",
     "constraint",
     "file",
+    "geometry_nodes",
     "image",
     "mesh",
     "node",
@@ -42,7 +43,6 @@ _modules = [
     "rigidbody",
     "screen_play_rendered_anim",
     "sequencer",
-    "simulation",
     "userpref",
     "uvcalc_follow_active",
     "uvcalc_lightmap",

release/scripts/startup/bl_operators/geometry_nodes.py

@@ -19,23 +19,30 @@
 import bpy
 
 
-class NewSimulation(bpy.types.Operator):
-    """Create a new simulation data block and edit it in the opened simulation editor"""
+class NewGeometryNodeTree(bpy.types.Operator):
+    """Create a new geometry node tree"""
 
-    bl_idname = "simulation.new"
-    bl_label = "New Simulation"
+    bl_idname = "node.new_geometry_node_tree"
+    bl_label = "New Geometry Node Tree"
     bl_options = {'REGISTER', 'UNDO'}
 
     @classmethod
     def poll(cls, context):
-        return context.area.type == 'NODE_EDITOR' and context.space_data.tree_type == 'SimulationNodeTree'
+        return context.area.type == 'NODE_EDITOR' and context.space_data.tree_type == 'GeometryNodeTree'
 
     def execute(self, context):
-        simulation = bpy.data.simulations.new("Simulation")
-        context.space_data.simulation = simulation
+        group = bpy.data.node_groups.new("Geometry Node Group", 'GeometryNodeTree')
+        group.inputs.new('NodeSocketGeometry', "Geometry")
+        group.outputs.new('NodeSocketGeometry', "Geometry")
+        input_node = group.nodes.new('NodeGroupInput')
+        output_node = group.nodes.new('NodeGroupOutput')
+
+        input_node.location.x = -200 - input_node.width
+        output_node.location.x = 200
+        context.space_data.node_tree = group
         return {'FINISHED'}
 
 
 classes = (
-    NewSimulation,
+    NewGeometryNodeTree,
 )

release/scripts/startup/bl_ui/space_node.py

@@ -151,13 +151,10 @@ class NODE_HT_header(Header):
             if snode_id:
                 layout.prop(snode_id, "use_nodes")
 
-        elif snode.tree_type == 'SimulationNodeTree':
-            row = layout.row(align=True)
-            row.prop(snode, "simulation", text="")
-            row.operator("simulation.new", text="", icon='ADD')
-            simulation = snode.simulation
-            if simulation:
-                row.prop(snode.simulation, "use_fake_user", text="")
+        elif snode.tree_type == 'GeometryNodeTree':
+            NODE_MT_editor_menus.draw_collapsible(context, layout)
+            layout.separator_spacer()
+            layout.template_ID(snode, "node_tree", new="node.new_geometry_node_tree")
 
         else:
             # Custom node tree is edited as independent ID block

release/scripts/startup/nodeitems_builtins.py

@@ -58,11 +58,11 @@ class TextureNodeCategory(SortedNodeCategory):
                 context.space_data.tree_type == 'TextureNodeTree')
 
 
-class SimulationNodeCategory(SortedNodeCategory):
+class GeometryNodeCategory(SortedNodeCategory):
     @classmethod
     def poll(cls, context):
         return (context.space_data.type == 'NODE_EDITOR' and
-                context.space_data.tree_type == 'SimulationNodeTree')
+                context.space_data.tree_type == 'GeometryNodeTree')
 
 
 # menu entry for node group tools
@@ -77,11 +77,11 @@ node_tree_group_type = {
     'CompositorNodeTree': 'CompositorNodeGroup',
     'ShaderNodeTree': 'ShaderNodeGroup',
     'TextureNodeTree': 'TextureNodeGroup',
-    'SimulationNodeTree': 'SimulationNodeGroup',
+    'GeometryNodeTree': 'GeometryNodeGroup',
 }
 
 
-# generic node group items generator for shader, compositor, simulation and texture node groups
+# generic node group items generator for shader, compositor, geometry and texture node groups
 def node_group_items(context):
     if context is None:
         return
@@ -483,10 +483,32 @@ def not_implemented_node(idname):
     return NodeItem(idname, label=label)
 
 
-simulation_node_categories = [
-    # Simulation Nodes
-    SimulationNodeCategory("SIM_GROUP", "Group", items=node_group_items),
-    SimulationNodeCategory("SIM_LAYOUT", "Layout", items=[
+geometry_node_categories = [
+    # Geometry Nodes
+    GeometryNodeCategory("GEO_MESH", "Mesh", items=[
+        NodeItem("GeometryNodeTriangulate"),
+        NodeItem("GeometryNodeEdgeSplit"),
+        NodeItem("GeometryNodeTransform"),
+    ]),
+    GeometryNodeCategory("GEO_MATH", "Misc", items=[
+        NodeItem("ShaderNodeMapRange"),
+        NodeItem("ShaderNodeClamp"),
+        NodeItem("ShaderNodeMath"),
+        NodeItem("ShaderNodeValToRGB"),
+        NodeItem("ShaderNodeVectorMath"),
+        NodeItem("ShaderNodeSeparateRGB"),
+        NodeItem("ShaderNodeCombineRGB"),
+        NodeItem("ShaderNodeSeparateXYZ"),
+        NodeItem("ShaderNodeCombineXYZ"),
+        NodeItem("FunctionNodeBooleanMath"),
+        NodeItem("FunctionNodeFloatCompare"),
+        NodeItem("FunctionNodeCombineStrings"),
+        NodeItem("FunctionNodeRandomFloat"),
+        NodeItem("ShaderNodeValue"),
+        NodeItem("FunctionNodeGroupInstanceID"),
+    ]),
+    GeometryNodeCategory("GEO_GROUP", "Group", items=node_group_items),
+    GeometryNodeCategory("GEO_LAYOUT", "Layout", items=[
         NodeItem("NodeFrame"),
         NodeItem("NodeReroute"),
     ]),
@@ -497,14 +519,14 @@ 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)
+    nodeitems_utils.register_node_categories('GEOMETRY', geometry_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')
+    nodeitems_utils.unregister_node_categories('GEOMETRY')
 
 
 if __name__ == "__main__":

source/blender/blenkernel/BKE_geometry.hh

@@ -0,0 +1,204 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+/** \file
+ * \ingroup bke
+ */
+
+#include <atomic>
+#include <iostream>
+
+#include "BLI_hash.hh"
+
+struct Mesh;
+
+namespace blender::bke {
+
+/**
+ * Geometry can contain geometry of different types, such as meshes and curves (although currently
+ * only meshes are supported).
+ *
+ * Geometries are reference counted. This allows them to be shared without making unnecessary
+ * copies. A geometry that is shared is immutable. If some code wants to change it,
+ * #make_geometry_mutable should be called first.
+ */
+class Geometry {
+ private:
+  /* Number of users of this geometry. If this number goes to zero, the geometry is freed. If it is
+   * above 1, the geometry is immutable. */
+  std::atomic<int> users_ = 1;
+
+  /* Only contains a mesh for now. */
+  Mesh *mesh_ = nullptr;
+  /* Determines if the mesh is freed when the geometry does not want to reference it anymore. */
+  bool mesh_owned_ = false;
+
+ public:
+  Geometry() = default;
+  Geometry(const Geometry &other);
+  Geometry(Geometry &&other) = delete;
+  ~Geometry();
+
+  /* Disable copy and move assignment operators. */
+  Geometry &operator=(const Geometry &other) = delete;
+  Geometry &operator=(Geometry &&other) = delete;
+
+  void user_add();
+  void user_remove();
+  bool is_mutable() const;
+
+  void mesh_set_and_keep_ownership(Mesh *mesh);
+  void mesh_set_and_transfer_ownership(Mesh *mesh);
+  void mesh_reset();
+  Mesh *mesh_get_for_read();
+  Mesh *mesh_get_for_write();
+  Mesh *mesh_release();
+};
+
+/**
+ * A simple automatic reference counter. This should probably be moved to another file eventually.
+ * It is similar to std::shared_ptr, but expects that the reference count is inside the object.
+ */
+template<typename T> class UserCounter {
+ private:
+  T *data_ = nullptr;
+
+ public:
+  UserCounter() = default;
+
+  UserCounter(T *data) : data_(data)
+  {
+  }
+
+  UserCounter(const UserCounter &other) : data_(other.data_)
+  {
+    this->user_add(data_);
+  }
+
+  UserCounter(UserCounter &&other) : data_(other.data_)
+  {
+    other.data_ = nullptr;
+  }
+
+  ~UserCounter()
+  {
+    this->user_remove(data_);
+  }
+
+  UserCounter &operator=(const UserCounter &other)
+  {
+    if (this == &other) {
+      return *this;
+    }
+
+    this->user_remove(data_);
+    data_ = other.data_;
+    this->user_add(data_);
+    return *this;
+  }
+
+  UserCounter &operator=(UserCounter &&other)
+  {
+    if (this == &other) {
+      return *this;
+    }
+
+    this->user_remove(data_);
+    data_ = other.data_;
+    other.data_ = nullptr;
+    return *this;
+  }
+
+  T *operator->()
+  {
+    BLI_assert(data_ != nullptr);
+    return data_;
+  }
+
+  T &operator*()
+  {
+    BLI_assert(data_ != nullptr);
+    return *data_;
+  }
+
+  operator bool() const
+  {
+    return data_ != nullptr;
+  }
+
+  T *get()
+  {
+    return data_;
+  }
+
+  T *release()
+  {
+    T *data = data_;
+    data_ = nullptr;
+    return data;
+  }
+
+  void reset()
+  {
+    this->user_remove(data_);
+    data_ = nullptr;
+  }
+
+  bool has_value() const
+  {
+    return data_ != nullptr;
+  }
+
+  uint64_t hash() const
+  {
+    return DefaultHash<T *>{}(data_);
+  }
+
+  friend bool operator==(const UserCounter &a, const UserCounter &b)
+  {
+    return a.data_ == b.data_;
+  }
+
+  friend std::ostream &operator<<(std::ostream &stream, const UserCounter &value)
+  {
+    stream << value.data_;
+    return stream;
+  }
+
+ private:
+  static void user_add(T *data)
+  {
+    if (data != nullptr) {
+      data->user_add();
+    }
+  }
+
+  static void user_remove(T *data)
+  {
+    if (data != nullptr) {
+      data->user_remove();
+    }
+  }
+};
+
+/* An automatically reference counted geometry. */
+using GeometryPtr = UserCounter<class Geometry>;
+
+void make_geometry_mutable(GeometryPtr &geometry);
+
+}  // namespace blender::bke

source/blender/blenkernel/BKE_node.h

@@ -112,20 +112,28 @@ namespace blender {
 namespace nodes {
 class SocketMFNetworkBuilder;
 class NodeMFNetworkBuilder;
+class GValueByName;
 }  // namespace nodes
 namespace fn {
+class CPPType;
 class MFDataType;
-}
+}  // namespace fn
 }  // namespace blender
 
 using NodeExpandInMFNetworkFunction = void (*)(blender::nodes::NodeMFNetworkBuilder &builder);
-using SocketGetMFDataTypeFunction = blender::fn::MFDataType (*)();
+using NodeGeometryExecFunction = void (*)(struct bNode *node,
+                                          blender::nodes::GValueByName &inputs,
+                                          blender::nodes::GValueByName &outputs);
+using SocketGetCPPTypeFunction = const blender::fn::CPPType *(*)();
+using SocketGetCPPValueFunction = void (*)(const struct bNodeSocket &socket, void *r_value);
 using SocketExpandInMFNetworkFunction = void (*)(blender::nodes::SocketMFNetworkBuilder &builder);
 
 #else
 typedef void *NodeExpandInMFNetworkFunction;
-typedef void *SocketGetMFDataTypeFunction;
 typedef void *SocketExpandInMFNetworkFunction;
+typedef void *NodeGeometryExecFunction;
+typedef void *SocketGetCPPTypeFunction;
+typedef void *SocketGetCPPValueFunction;
 #endif
 
 /**
@@ -181,10 +189,12 @@ typedef struct bNodeSocketType {
   /* Callback to free the socket type. */
   void (*free_self)(struct bNodeSocketType *stype);
 
-  /* Returns the multi-function data type of this socket type. */
-  SocketGetMFDataTypeFunction get_mf_data_type;
   /* Expands the socket into a multi-function node that outputs the socket value. */
   SocketExpandInMFNetworkFunction expand_in_mf_network;
+  /* Return the CPPType of this socket. */
+  SocketGetCPPTypeFunction get_cpp_type;
+  /* Get the value of this socket in a generic way. */
+  SocketGetCPPValueFunction get_cpp_value;
 } bNodeSocketType;
 
 typedef void *(*NodeInitExecFunction)(struct bNodeExecContext *context,
@@ -302,6 +312,9 @@ typedef struct bNodeType {
   /* Expands the bNode into nodes in a multi-function network, which will be evaluated later on. */
   NodeExpandInMFNetworkFunction expand_in_mf_network;
 
+  /* Execute a geometry node. */
+  NodeGeometryExecFunction geometry_node_execute;
+
   /* RNA integration */
   ExtensionRNA rna_ext;
 } bNodeType;
@@ -1323,6 +1336,16 @@ int ntreeTexExecTree(struct bNodeTree *ntree,
                      struct MTex *mtex);
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name Geometry Nodes
+ * \{ */
+
+#define GEO_NODE_TRIANGULATE 1000
+#define GEO_NODE_EDGE_SPLIT 1001
+#define GEO_NODE_TRANSFORM 1002
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name Function Nodes
  * \{ */

source/blender/blenkernel/CMakeLists.txt

@@ -124,6 +124,7 @@ set(SRC
   intern/fmodifier.c
   intern/font.c
   intern/freestyle.c
+  intern/geometry.cc
   intern/gpencil.c
   intern/gpencil_curve.c
   intern/gpencil_geom.c
@@ -310,6 +311,7 @@ set(SRC
   BKE_fluid.h
   BKE_font.h
   BKE_freestyle.h
+  BKE_geometry.hh
   BKE_global.h
   BKE_gpencil.h
   BKE_gpencil_curve.h

source/blender/blenkernel/intern/geometry.cc

@@ -0,0 +1,152 @@
+/*
+ * 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.
+ */
+
+#include "BKE_geometry.hh"
+#include "BKE_lib_id.h"
+#include "BKE_mesh.h"
+
+#include "MEM_guardedalloc.h"
+
+namespace blender::bke {
+
+/* Make a copy of the geometry. */
+Geometry::Geometry(const Geometry &other)
+{
+  if (other.mesh_ != nullptr) {
+    mesh_ = BKE_mesh_copy_for_eval(other.mesh_, false);
+    /* Own the new mesh, regardless of whether the original mesh was owned. */
+    mesh_owned_ = true;
+  }
+}
+
+Geometry::~Geometry()
+{
+  this->mesh_reset();
+}
+
+void Geometry::user_add()
+{
+  users_.fetch_add(1);
+}
+
+void Geometry::user_remove()
+{
+  const int new_users = users_.fetch_sub(1) - 1;
+  if (new_users == 0) {
+    delete this;
+  }
+}
+
+bool Geometry::is_mutable() const
+{
+  /* If the geometry is shared, it is read-only. */
+  /* The user count can be 0, when this is called from the destructor. */
+  return users_ <= 1;
+}
+
+/**
+ * Replace the mesh in the geometry. The caller remains the owner of the given mesh and is
+ * responsible for freeing it eventually.
+ */
+void Geometry::mesh_set_and_keep_ownership(Mesh *mesh)
+{
+  BLI_assert(this->is_mutable());
+  this->mesh_reset();
+  mesh_ = mesh;
+  mesh_owned_ = false;
+}
+
+/**
+ * Replace the mesh in the geometry. The geometry becomes responsible for freeing the mesh.
+ */
+void Geometry::mesh_set_and_transfer_ownership(Mesh *mesh)
+{
+  BLI_assert(this->is_mutable());
+  this->mesh_reset();
+  mesh_ = mesh;
+  mesh_owned_ = true;
+}
+
+/**
+ * Clear any mesh data the geometry might have.
+ */
+void Geometry::mesh_reset()
+{
+  BLI_assert(this->is_mutable());
+  if (mesh_ != nullptr) {
+    if (mesh_owned_) {
+      BKE_id_free(nullptr, mesh_);
+    }
+    mesh_ = nullptr;
+  }
+}
+
+/**
+ * Get the mesh from the geometry. This mesh should only be read and not modified. This can be used
+ * on shared geometries.
+ * Might return null.
+ */
+Mesh *Geometry::mesh_get_for_read()
+{
+  return mesh_;
+}
+
+/**
+ * Get the mesh from the geometry. The caller is allowed to modify the mesh. This method can only
+ * be used on mutable geometries.
+ * Might return null.
+ */
+Mesh *Geometry::mesh_get_for_write()
+{
+  BLI_assert(this->is_mutable());
+  return mesh_;
+}
+
+/**
+ * Return the mesh in the geometry and remove it. This only works on mutable geometries.
+ * Might return null;
+ */
+Mesh *Geometry::mesh_release()
+{
+  BLI_assert(this->is_mutable());
+  Mesh *mesh = mesh_;
+  mesh_ = nullptr;
+  return mesh;
+}
+
+/**
+ * Changes the given pointer so that it points to a mutable geometry. This might do nothing, create
+ * a new empty geometry or copy the entire geometry.
+ */
+void make_geometry_mutable(GeometryPtr &geometry)
+{
+  if (!geometry) {
+    /* If the pointer is null, create a new instance. */
+    geometry = GeometryPtr{new Geometry()};
+  }
+  else if (geometry->is_mutable()) {
+    /* If the instance is mutable already, do nothing. */
+  }
+  else {
+    /* This geometry is shared, make a copy that is independent of the other users. */
+    Geometry *shared_geometry = geometry.release();
+    Geometry *new_geometry = new Geometry(*shared_geometry);
+    shared_geometry->user_remove();
+    geometry = GeometryPtr{new_geometry};
+  }
+}
+
+}  // namespace blender::bke

source/blender/blenkernel/intern/node.c

@@ -65,7 +65,6 @@
 #include "BKE_lib_query.h"
 #include "BKE_main.h"
 #include "BKE_node.h"
-#include "BKE_simulation.h"
 
 #include "BLI_ghash.h"
 #include "BLI_threads.h"
@@ -75,8 +74,8 @@
 #include "NOD_common.h"
 #include "NOD_composite.h"
 #include "NOD_function.h"
+#include "NOD_geometry.h"
 #include "NOD_shader.h"
-#include "NOD_simulation.h"
 #include "NOD_socket.h"
 #include "NOD_texture.h"
 
@@ -281,6 +280,7 @@ static void library_foreach_node_socket(LibraryForeachIDData *data, bNodeSocket
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -373,6 +373,7 @@ static void write_node_socket_default_value(BlendWriter *writer, bNodeSocket *so
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       BLI_assert(false);
       break;
   }
@@ -715,6 +716,7 @@ static void lib_link_node_socket(BlendLibReader *reader, Library *lib, bNodeSock
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -793,6 +795,7 @@ static void expand_node_socket(BlendExpander *expander, bNodeSocket *sock)
       case __SOCK_MESH:
       case SOCK_CUSTOM:
       case SOCK_SHADER:
+      case SOCK_GEOMETRY:
         break;
     }
   }
@@ -1345,6 +1348,7 @@ static void socket_id_user_increment(bNodeSocket *sock)
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -1371,6 +1375,7 @@ static void socket_id_user_decrement(bNodeSocket *sock)
     case __SOCK_MESH:
     case SOCK_CUSTOM:
     case SOCK_SHADER:
+    case SOCK_GEOMETRY:
       break;
   }
 }
@@ -1498,6 +1503,8 @@ const char *nodeStaticSocketType(int type, int subtype)
       return "NodeSocketObject";
     case SOCK_IMAGE:
       return "NodeSocketImage";
+    case SOCK_GEOMETRY:
+      return "NodeSocketGeometry";
   }
   return NULL;
 }
@@ -1563,6 +1570,8 @@ const char *nodeStaticSocketInterfaceType(int type, int subtype)
       return "NodeSocketInterfaceObject";
     case SOCK_IMAGE:
       return "NodeSocketInterfaceImage";
+    case SOCK_GEOMETRY:
+      return "NodeSocketInterfaceGeometry";
   }
   return NULL;
 }
@@ -4646,9 +4655,13 @@ static void registerTextureNodes(void)
   register_node_type_tex_proc_distnoise();
 }
 
-static void registerSimulationNodes(void)
+static void registerGeometryNodes(void)
 {
-  register_node_type_sim_group();
+  register_node_type_geo_group();
+
+  register_node_type_geo_triangulate();
+  register_node_type_geo_edge_split();
+  register_node_type_geo_transform();
 }
 
 static void registerFunctionNodes(void)
@@ -4675,7 +4688,7 @@ 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_tree_type_geo();
 
   register_node_type_frame();
   register_node_type_reroute();
@@ -4685,7 +4698,7 @@ void init_nodesystem(void)
   registerCompositNodes();
   registerShaderNodes();
   registerTextureNodes();
-  registerSimulationNodes();
+  registerGeometryNodes();
   registerFunctionNodes();
 }
 

source/blender/blenkernel/intern/pointcache.c

@@ -1187,9 +1187,6 @@ static bool foreach_object_modifier_ptcache(Object *object,
         }
       }
     }
-    else if (md->type == eModifierType_Simulation) {
-      /* TODO(jacques): */
-    }
   }
   return true;
 }

source/blender/blenkernel/intern/simulation.cc

@@ -48,8 +48,8 @@
 #include "BKE_pointcache.h"
 #include "BKE_simulation.h"
 
+#include "NOD_geometry.h"
 #include "NOD_node_tree_multi_function.hh"
-#include "NOD_simulation.h"
 
 #include "BLI_map.hh"
 #include "BLT_translation.h"
@@ -70,7 +70,7 @@ static void simulation_init_data(ID *id)
 
   MEMCPY_STRUCT_AFTER(simulation, DNA_struct_default_get(Simulation), id);
 
-  bNodeTree *ntree = ntreeAddTree(nullptr, "Simulation Nodetree", ntreeType_Simulation->idname);
+  bNodeTree *ntree = ntreeAddTree(nullptr, "Geometry Nodetree", ntreeType_Geometry->idname);
   simulation->nodetree = ntree;
 }
 

source/blender/blenloader/intern/readfile.c

@@ -158,7 +158,6 @@
 #include "BKE_screen.h"
 #include "BKE_sequencer.h"
 #include "BKE_shader_fx.h"
-#include "BKE_simulation.h"
 #include "BKE_sound.h"
 #include "BKE_volume.h"
 #include "BKE_workspace.h"

source/blender/depsgraph/DEG_depsgraph_build.h

@@ -141,6 +141,9 @@ void DEG_add_object_relation(struct DepsNodeHandle *node_handle,
 void DEG_add_simulation_relation(struct DepsNodeHandle *node_handle,
                                  struct Simulation *simulation,
                                  const char *description);
+void DEG_add_node_tree_relation(struct DepsNodeHandle *node_handle,
+                                struct bNodeTree *node_tree,
+                                const char *description);
 void DEG_add_bone_relation(struct DepsNodeHandle *handle,
                            struct Object *object,
                            const char *bone_name,

source/blender/depsgraph/intern/depsgraph_build.cc

@@ -32,6 +32,7 @@
 #include "PIL_time_utildefines.h"
 
 #include "DNA_cachefile_types.h"
+#include "DNA_node_types.h"
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
 #include "DNA_simulation_types.h"
@@ -116,6 +117,17 @@ void DEG_add_simulation_relation(DepsNodeHandle *node_handle,
   deg_node_handle->builder->add_node_handle_relation(operation_key, deg_node_handle, description);
 }
 
+void DEG_add_node_tree_relation(DepsNodeHandle *node_handle,
+                                bNodeTree *node_tree,
+                                const char *description)
+{
+  /* Using shading key, because that's the one that exists right now. Should use something else in
+   * the future. */
+  deg::ComponentKey shading_key(&node_tree->id, deg::NodeType::SHADING);
+  deg::DepsNodeHandle *deg_node_handle = get_node_handle(node_handle);
+  deg_node_handle->builder->add_node_handle_relation(shading_key, deg_node_handle, description);
+}
+
 void DEG_add_object_cache_relation(DepsNodeHandle *node_handle,
                                    CacheFile *cache_file,
                                    eDepsObjectComponentType component,

source/blender/editors/include/ED_node.h

@@ -96,7 +96,7 @@ void ED_node_set_tree_type(struct SpaceNode *snode, struct bNodeTreeType *typein
 bool ED_node_is_compositor(struct SpaceNode *snode);
 bool ED_node_is_shader(struct SpaceNode *snode);
 bool ED_node_is_texture(struct SpaceNode *snode);
-bool ED_node_is_simulation(struct SpaceNode *snode);
+bool ED_node_is_geometry(struct SpaceNode *snode);
 
 void ED_node_shader_default(const struct bContext *C, struct ID *id);
 void ED_node_composit_default(const struct bContext *C, struct Scene *scene);

source/blender/editors/space_node/drawnode.c

@@ -68,8 +68,8 @@
 #include "IMB_imbuf_types.h"
 
 #include "NOD_composite.h"
+#include "NOD_geometry.h"
 #include "NOD_shader.h"
-#include "NOD_simulation.h"
 #include "NOD_texture.h"
 #include "node_intern.h" /* own include */
 
@@ -3138,9 +3138,9 @@ static void node_texture_set_butfunc(bNodeType *ntype)
   }
 }
 
-/* ****************** BUTTON CALLBACKS FOR SIMULATION NODES ***************** */
+/* ****************** BUTTON CALLBACKS FOR GEOMETRY NODES ***************** */
 
-static void node_simulation_set_butfunc(bNodeType *UNUSED(ntype))
+static void node_geometry_set_butfunc(bNodeType *UNUSED(ntype))
 {
 }
 
@@ -3286,7 +3286,7 @@ void ED_node_init_butfuncs(void)
     node_composit_set_butfunc(ntype);
     node_shader_set_butfunc(ntype);
     node_texture_set_butfunc(ntype);
-    node_simulation_set_butfunc(ntype);
+    node_geometry_set_butfunc(ntype);
     node_function_set_butfunc(ntype);
 
     /* define update callbacks for socket properties */
@@ -3298,7 +3298,7 @@ void ED_node_init_butfuncs(void)
   ntreeType_Composite->ui_icon = ICON_NODE_COMPOSITING;
   ntreeType_Shader->ui_icon = ICON_NODE_MATERIAL;
   ntreeType_Texture->ui_icon = ICON_NODE_TEXTURE;
-  ntreeType_Simulation->ui_icon = ICON_PHYSICS; /* TODO: Use correct icon. */
+  ntreeType_Geometry->ui_icon = ICON_PHYSICS; /* TODO: Use correct icon. */
 }
 
 void ED_init_custom_node_type(bNodeType *ntype)
@@ -3329,6 +3329,7 @@ static const float std_node_socket_colors[][4] = {
     {0.39, 0.39, 0.39, 1.0}, /* SOCK_STRING */
     {0.40, 0.10, 0.10, 1.0}, /* SOCK_OBJECT */
     {0.10, 0.40, 0.10, 1.0}, /* SOCK_IMAGE */
+    {0.00, 0.00, 0.00, 1.0}, /* SOCK_GEOMETRY, TODO: Choose color. */
 };
 
 /* common color callbacks for standard types */

source/blender/editors/space_node/node_draw.c

@@ -138,6 +138,9 @@ void ED_node_tag_update_id(ID *id)
     DEG_id_tag_update(id, 0);
     WM_main_add_notifier(NC_TEXTURE | ND_NODES, id);
   }
+  else if (ntree->type == NTREE_GEOMETRY) {
+    WM_main_add_notifier(NC_OBJECT | ND_MODIFIER, id);
+  }
   else if (id == &ntree->id) {
     /* node groups */
     DEG_id_tag_update(id, 0);

source/blender/editors/space_node/node_edit.c

@@ -68,8 +68,8 @@
 #include "IMB_imbuf_types.h"
 
 #include "NOD_composite.h"
+#include "NOD_geometry.h"
 #include "NOD_shader.h"
-#include "NOD_simulation.h"
 #include "NOD_texture.h"
 #include "node_intern.h" /* own include */
 
@@ -391,6 +391,7 @@ void snode_dag_update(bContext *C, SpaceNode *snode)
   }
 
   DEG_id_tag_update(snode->id, 0);
+  DEG_id_tag_update(&snode->nodetree->id, 0);
 }
 
 void snode_notify(bContext *C, SpaceNode *snode)
@@ -416,6 +417,9 @@ void snode_notify(bContext *C, SpaceNode *snode)
   else if (ED_node_is_texture(snode)) {
     WM_event_add_notifier(C, NC_TEXTURE | ND_NODES, id);
   }
+  else if (ED_node_is_geometry(snode)) {
+    WM_main_add_notifier(NC_OBJECT | ND_MODIFIER, id);
+  }
 }
 
 void ED_node_set_tree_type(SpaceNode *snode, bNodeTreeType *typeinfo)
@@ -443,9 +447,9 @@ bool ED_node_is_texture(struct SpaceNode *snode)
   return STREQ(snode->tree_idname, ntreeType_Texture->idname);
 }
 
-bool ED_node_is_simulation(struct SpaceNode *snode)
+bool ED_node_is_geometry(struct SpaceNode *snode)
 {
-  return STREQ(snode->tree_idname, ntreeType_Simulation->idname);
+  return STREQ(snode->tree_idname, ntreeType_Geometry->idname);
 }
 
 /* assumes nothing being done in ntree yet, sets the default in/out node */
@@ -1696,7 +1700,7 @@ static int node_mute_exec(bContext *C, wmOperator *UNUSED(op))
     }
   }
 
-  do_tag_update |= ED_node_is_simulation(snode);
+  do_tag_update |= ED_node_is_geometry(snode);
 
   snode_notify(C, snode);
   if (do_tag_update) {
@@ -1740,7 +1744,7 @@ static int node_delete_exec(bContext *C, wmOperator *UNUSED(op))
     }
   }
 
-  do_tag_update |= ED_node_is_simulation(snode);
+  do_tag_update |= ED_node_is_geometry(snode);
 
   ntreeUpdateTree(CTX_data_main(C), snode->edittree);
 

source/blender/editors/space_node/node_group.c

@@ -71,7 +71,7 @@ static bool node_group_operator_active(bContext *C)
     if (STREQ(snode->tree_idname, "ShaderNodeTree") ||
         STREQ(snode->tree_idname, "CompositorNodeTree") ||
         STREQ(snode->tree_idname, "TextureNodeTree") ||
-        STREQ(snode->tree_idname, "SimulationNodeTree")) {
+        STREQ(snode->tree_idname, "GeometryNodeTree")) {
       return true;
     }
   }
@@ -88,7 +88,7 @@ static bool node_group_operator_editable(bContext *C)
      * with same keymap.
      */
     if (ED_node_is_shader(snode) || ED_node_is_compositor(snode) || ED_node_is_texture(snode) ||
-        ED_node_is_simulation(snode)) {
+        ED_node_is_geometry(snode)) {
       return true;
     }
   }
@@ -114,8 +114,8 @@ static const char *group_node_idname(bContext *C)
   if (ED_node_is_texture(snode)) {
     return "TextureNodeGroup";
   }
-  if (ED_node_is_simulation(snode)) {
-    return "SimulationNodeGroup";
+  if (ED_node_is_geometry(snode)) {
+    return "GeometryNodeGroup";
   }
 
   return "";

source/blender/editors/space_node/node_relationships.c

@@ -655,7 +655,7 @@ static void node_link_exit(bContext *C, wmOperator *op, bool apply_links)
   }
   ntree->is_updating = false;
 
-  do_tag_update |= ED_node_is_simulation(snode);
+  do_tag_update |= ED_node_is_geometry(snode);
 
   ntreeUpdateTree(bmain, ntree);
   snode_notify(C, snode);
@@ -1052,7 +1052,7 @@ static int cut_links_exec(bContext *C, wmOperator *op)
       }
     }
 
-    do_tag_update |= ED_node_is_simulation(snode);
+    do_tag_update |= ED_node_is_geometry(snode);
 
     if (found) {
       ntreeUpdateTree(CTX_data_main(C), snode->edittree);

source/blender/editors/space_node/space_node.c

@@ -936,7 +936,7 @@ static void node_space_subtype_item_extend(bContext *C, EnumPropertyItem **item,
   const EnumPropertyItem *item_src = RNA_enum_node_tree_types_itemf_impl(C, &free);
   for (const EnumPropertyItem *item_iter = item_src; item_iter->identifier; item_iter++) {
     if (!U.experimental.use_new_geometry_nodes &&
-        STREQ(item_iter->identifier, "SimulationNodeTree")) {
+        STREQ(item_iter->identifier, "GeometryNodeTree")) {
       continue;
     }
     RNA_enum_item_add(item, totitem, item_iter);

source/blender/functions/CMakeLists.txt

@@ -38,6 +38,7 @@ set(SRC
   FN_array_spans.hh
   FN_attributes_ref.hh
   FN_cpp_type.hh
+  FN_generic_pointer.hh
   FN_generic_vector_array.hh
   FN_multi_function.hh
   FN_multi_function_builder.hh

source/blender/functions/FN_cpp_type.hh

@@ -91,6 +91,14 @@ class CPPType : NonCopyable, NonMovable {
   using CopyToUninitializedNF = void (*)(const void *src, void *dst, int64_t n);
   using CopyToUninitializedIndicesF = void (*)(const void *src, void *dst, IndexMask mask);
 
+  using MoveToInitializedF = void (*)(void *src, void *dst);
+  using MoveToInitializedNF = void (*)(void *src, void *dst, int64_t n);
+  using MoveToInitializedIndicesF = void (*)(void *src, void *dst, IndexMask mask);
+
+  using MoveToUninitializedF = void (*)(void *src, void *dst);
+  using MoveToUninitializedNF = void (*)(void *src, void *dst, int64_t n);
+  using MoveToUninitializedIndicesF = void (*)(void *src, void *dst, IndexMask mask);
+
   using RelocateToInitializedF = void (*)(void *src, void *dst);
   using RelocateToInitializedNF = void (*)(void *src, void *dst, int64_t n);
   using RelocateToInitializedIndicesF = void (*)(void *src, void *dst, IndexMask mask);
@@ -131,6 +139,14 @@ class CPPType : NonCopyable, NonMovable {
   CopyToUninitializedNF copy_to_uninitialized_n_;
   CopyToUninitializedIndicesF copy_to_uninitialized_indices_;
 
+  MoveToInitializedF move_to_initialized_;
+  MoveToInitializedNF move_to_initialized_n_;
+  MoveToInitializedIndicesF move_to_initialized_indices_;
+
+  MoveToUninitializedF move_to_uninitialized_;
+  MoveToUninitializedNF move_to_uninitialized_n_;
+  MoveToUninitializedIndicesF move_to_uninitialized_indices_;
+
   RelocateToInitializedF relocate_to_initialized_;
   RelocateToInitializedNF relocate_to_initialized_n_;
   RelocateToInitializedIndicesF relocate_to_initialized_indices_;
@@ -169,6 +185,12 @@ class CPPType : NonCopyable, NonMovable {
           CopyToUninitializedF copy_to_uninitialized,
           CopyToUninitializedNF copy_to_uninitialized_n,
           CopyToUninitializedIndicesF copy_to_uninitialized_indices,
+          MoveToInitializedF move_to_initialized,
+          MoveToInitializedNF move_to_initialized_n,
+          MoveToInitializedIndicesF move_to_initialized_indices,
+          MoveToUninitializedF move_to_uninitialized,
+          MoveToUninitializedNF move_to_uninitialized_n,
+          MoveToUninitializedIndicesF move_to_uninitialized_indices,
           RelocateToInitializedF relocate_to_initialized,
           RelocateToInitializedNF relocate_to_initialized_n,
           RelocateToInitializedIndicesF relocate_to_initialized_indices,
@@ -198,6 +220,12 @@ class CPPType : NonCopyable, NonMovable {
         copy_to_uninitialized_(copy_to_uninitialized),
         copy_to_uninitialized_n_(copy_to_uninitialized_n),
         copy_to_uninitialized_indices_(copy_to_uninitialized_indices),
+        move_to_initialized_(move_to_initialized),
+        move_to_initialized_n_(move_to_initialized_n),
+        move_to_initialized_indices_(move_to_initialized_indices),
+        move_to_uninitialized_(move_to_uninitialized),
+        move_to_uninitialized_n_(move_to_uninitialized_n),
+        move_to_uninitialized_indices_(move_to_uninitialized_indices),
         relocate_to_initialized_(relocate_to_initialized),
         relocate_to_initialized_n_(relocate_to_initialized_n),
         relocate_to_initialized_indices_(relocate_to_initialized_indices),
@@ -421,6 +449,76 @@ class CPPType : NonCopyable, NonMovable {
     copy_to_uninitialized_indices_(src, dst, mask);
   }
 
+  /**
+   * Move an instance of this type from src to dst.
+   *
+   * The memory pointed to by dst should be initialized.
+   *
+   * C++ equivalent:
+   *   dst = std::move(src);
+   */
+  void move_to_initialized(void *src, void *dst) const
+  {
+    BLI_assert(src != dst);
+    BLI_assert(this->pointer_can_point_to_instance(src));
+    BLI_assert(this->pointer_can_point_to_instance(dst));
+
+    move_to_initialized_(src, dst);
+  }
+
+  void move_to_initialized_n(void *src, void *dst, int64_t n) const
+  {
+    BLI_assert(n == 0 || src != dst);
+    BLI_assert(n == 0 || this->pointer_can_point_to_instance(src));
+    BLI_assert(n == 0 || this->pointer_can_point_to_instance(dst));
+
+    move_to_initialized_n_(src, dst, n);
+  }
+
+  void move_to_initialized_indices(void *src, void *dst, IndexMask mask) const
+  {
+    BLI_assert(mask.size() == 0 || src != dst);
+    BLI_assert(mask.size() == 0 || this->pointer_can_point_to_instance(src));
+    BLI_assert(mask.size() == 0 || this->pointer_can_point_to_instance(dst));
+
+    move_to_initialized_indices_(src, dst, mask);
+  }
+
+  /**
+   * Move an instance of this type from src to dst.
+   *
+   * The memory pointed to by dst should be uninitialized.
+   *
+   * C++ equivalent:
+   *   new (dst) T(std::move(src));
+   */
+  void move_to_uninitialized(void *src, void *dst) const
+  {
+    BLI_assert(src != dst);
+    BLI_assert(this->pointer_can_point_to_instance(src));
+    BLI_assert(this->pointer_can_point_to_instance(dst));
+
+    move_to_uninitialized_(src, dst);
+  }
+
+  void move_to_uninitialized_n(void *src, void *dst, int64_t n) const
+  {
+    BLI_assert(n == 0 || src != dst);
+    BLI_assert(n == 0 || this->pointer_can_point_to_instance(src));
+    BLI_assert(n == 0 || this->pointer_can_point_to_instance(dst));
+
+    move_to_uninitialized_n_(src, dst, n);
+  }
+
+  void move_to_uninitialized_indices(void *src, void *dst, IndexMask mask) const
+  {
+    BLI_assert(mask.size() == 0 || src != dst);
+    BLI_assert(mask.size() == 0 || this->pointer_can_point_to_instance(src));
+    BLI_assert(mask.size() == 0 || this->pointer_can_point_to_instance(dst));
+
+    move_to_uninitialized_indices_(src, dst, mask);
+  }
+
   /**
    * Relocates an instance of this type from src to dst. src will point to uninitialized memory
    * afterwards.
@@ -644,6 +742,38 @@ void copy_to_uninitialized_indices_cb(const void *src, void *dst, IndexMask mask
   mask.foreach_index([&](int64_t i) { new (dst_ + i) T(src_[i]); });
 }
 
+template<typename T> void move_to_initialized_cb(void *src, void *dst)
+{
+  blender::initialized_move_n(static_cast<T *>(src), 1, static_cast<T *>(dst));
+}
+template<typename T> void move_to_initialized_n_cb(void *src, void *dst, int64_t n)
+{
+  blender::initialized_move_n(static_cast<T *>(src), n, static_cast<T *>(dst));
+}
+template<typename T> void move_to_initialized_indices_cb(void *src, void *dst, IndexMask mask)
+{
+  T *src_ = static_cast<T *>(src);
+  T *dst_ = static_cast<T *>(dst);
+
+  mask.foreach_index([&](int64_t i) { dst_[i] = std::move(src_[i]); });
+}
+
+template<typename T> void move_to_uninitialized_cb(void *src, void *dst)
+{
+  blender::uninitialized_move_n(static_cast<T *>(src), 1, static_cast<T *>(dst));
+}
+template<typename T> void move_to_uninitialized_n_cb(void *src, void *dst, int64_t n)
+{
+  blender::uninitialized_move_n(static_cast<T *>(src), n, static_cast<T *>(dst));
+}
+template<typename T> void move_to_uninitialized_indices_cb(void *src, void *dst, IndexMask mask)
+{
+  T *src_ = static_cast<T *>(src);
+  T *dst_ = static_cast<T *>(dst);
+
+  mask.foreach_index([&](int64_t i) { new (dst_ + i) T(std::move(src_[i])); });
+}
+
 template<typename T> void relocate_to_initialized_cb(void *src, void *dst)
 {
   T *src_ = static_cast<T *>(src);
@@ -767,6 +897,12 @@ inline std::unique_ptr<const CPPType> create_cpp_type(StringRef name, const T &d
                                     copy_to_uninitialized_cb<T>,
                                     copy_to_uninitialized_n_cb<T>,
                                     copy_to_uninitialized_indices_cb<T>,
+                                    move_to_initialized_cb<T>,
+                                    move_to_initialized_n_cb<T>,
+                                    move_to_initialized_indices_cb<T>,
+                                    move_to_uninitialized_cb<T>,
+                                    move_to_uninitialized_n_cb<T>,
+                                    move_to_uninitialized_indices_cb<T>,
                                     relocate_to_initialized_cb<T>,
                                     relocate_to_initialized_n_cb<T>,
                                     relocate_to_initialized_indices_cb<T>,

source/blender/functions/FN_generic_pointer.hh

@@ -0,0 +1,76 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include "FN_cpp_type.hh"
+
+namespace blender::fn {
+
+/**
+ * A generic pointer whose type is only known at runtime.
+ */
+class GMutablePointer {
+ private:
+  const CPPType *type_ = nullptr;
+  void *data_ = nullptr;
+
+ public:
+  GMutablePointer() = default;
+
+  GMutablePointer(const CPPType *type, void *data = nullptr) : type_(type), data_(data)
+  {
+    /* If there is data, there has to be a type. */
+    BLI_assert(data_ == nullptr || type_ != nullptr);
+  }
+
+  GMutablePointer(const CPPType &type, void *data = nullptr) : GMutablePointer(&type, data)
+  {
+  }
+
+  template<typename T> GMutablePointer(T *data) : GMutablePointer(&CPPType::get<T>(), data)
+  {
+  }
+
+  void *get() const
+  {
+    return data_;
+  }
+
+  const CPPType *type() const
+  {
+    return type_;
+  }
+
+  template<typename T> T *get() const
+  {
+    BLI_assert(this->is_type<T>());
+    return reinterpret_cast<T *>(data_);
+  }
+
+  template<typename T> bool is_type() const
+  {
+    return type_ != nullptr && type_->is<T>();
+  }
+
+  void destruct()
+  {
+    BLI_assert(data_ != nullptr);
+    type_->destruct(data_);
+  }
+};
+
+}  // namespace blender::fn

source/blender/makesdna/DNA_modifier_defaults.h

@@ -574,7 +574,7 @@
     .flag = 0, \
   }
 
-#define _DNA_DEFAULT_SimulationModifierData \
+#define _DNA_DEFAULT_NodesModifierData \
   { 0 }
 
 #define _DNA_DEFAULT_SkinModifierData \

source/blender/makesdna/DNA_modifier_types.h

@@ -94,7 +94,7 @@ typedef enum ModifierType {
   eModifierType_WeightedNormal = 54,
   eModifierType_Weld = 55,
   eModifierType_Fluid = 56,
-  eModifierType_Simulation = 57,
+  eModifierType_Nodes = 57,
   eModifierType_MeshToVolume = 58,
   eModifierType_VolumeDisplace = 59,
   eModifierType_VolumeToMesh = 60,
@@ -2219,9 +2219,10 @@ enum {
 #define MOD_MESHSEQ_READ_ALL \
   (MOD_MESHSEQ_READ_VERT | MOD_MESHSEQ_READ_POLY | MOD_MESHSEQ_READ_UV | MOD_MESHSEQ_READ_COLOR)
 
-typedef struct SimulationModifierData {
+typedef struct NodesModifierData {
   ModifierData modifier;
-} SimulationModifierData;
+  struct bNodeTree *node_group;
+} NodesModifierData;
 
 typedef struct MeshToVolumeModifierData {
   ModifierData modifier;

source/blender/makesdna/DNA_node_types.h

@@ -155,6 +155,7 @@ typedef enum eNodeSocketDatatype {
   SOCK_STRING = 7,
   SOCK_OBJECT = 8,
   SOCK_IMAGE = 9,
+  SOCK_GEOMETRY = 10,
 } eNodeSocketDatatype;
 
 /* socket shape */
@@ -499,7 +500,7 @@ typedef struct bNodeTree {
 #define NTREE_SHADER 0
 #define NTREE_COMPOSIT 1
 #define NTREE_TEXTURE 2
-#define NTREE_SIMULATION 3
+#define NTREE_GEOMETRY 3
 
 /* ntree->init, flag */
 #define NTREE_TYPE_INIT 1
@@ -1422,15 +1423,3 @@ typedef enum NodeShaderOutputTarget {
   SHD_OUTPUT_EEVEE = 1,
   SHD_OUTPUT_CYCLES = 2,
 } NodeShaderOutputTarget;
-
-/* Particle Time Step Event node */
-typedef enum NodeSimParticleTimeStepEventType {
-  NODE_PARTICLE_TIME_STEP_EVENT_BEGIN = 0,
-  NODE_PARTICLE_TIME_STEP_EVENT_END = 1,
-} NodeSimParticleTimeStepEventType;
-
-/* Simulation Time node */
-typedef enum NodeSimInputTimeType {
-  NODE_SIM_INPUT_SIMULATION_TIME = 0,
-  NODE_SIM_INPUT_SCENE_TIME = 1,
-} NodeSimInputTimeType;

source/blender/makesdna/intern/dna_defaults.c

@@ -271,7 +271,7 @@ SDNA_DEFAULT_DECL_STRUCT(ScrewModifierData);
 /* Shape key modifier has no items. */
 SDNA_DEFAULT_DECL_STRUCT(ShrinkwrapModifierData);
 SDNA_DEFAULT_DECL_STRUCT(SimpleDeformModifierData);
-SDNA_DEFAULT_DECL_STRUCT(SimulationModifierData);
+SDNA_DEFAULT_DECL_STRUCT(NodesModifierData);
 SDNA_DEFAULT_DECL_STRUCT(SkinModifierData);
 SDNA_DEFAULT_DECL_STRUCT(SmoothModifierData);
 /* Softbody modifier skipped for now. */
@@ -491,7 +491,7 @@ const void *DNA_default_table[SDNA_TYPE_MAX] = {
     /* Shape key modifier has no items. */
     SDNA_DEFAULT_DECL(ShrinkwrapModifierData),
     SDNA_DEFAULT_DECL(SimpleDeformModifierData),
-    SDNA_DEFAULT_DECL(SimulationModifierData),
+    SDNA_DEFAULT_DECL(NodesModifierData),
     SDNA_DEFAULT_DECL(SkinModifierData),
     SDNA_DEFAULT_DECL(SmoothModifierData),
     /* Softbody modifier skipped for now. */

source/blender/makesrna/RNA_access.h

@@ -566,10 +566,10 @@ extern StructRNA RNA_SimpleDeformModifier;
 extern StructRNA RNA_SimplifyGpencilModifier;
 extern StructRNA RNA_Simulation;
 #ifdef WITH_GEOMETRY_NODES
-extern StructRNA RNA_SimulationModifier;
+extern StructRNA RNA_NodesModifier;
 #endif
-extern StructRNA RNA_SimulationNode;
-extern StructRNA RNA_SimulationNodeTree;
+extern StructRNA RNA_GeometryNode;
+extern StructRNA RNA_GeometryNodeTree;
 extern StructRNA RNA_SkinModifier;
 extern StructRNA RNA_SmoothGpencilModifier;
 extern StructRNA RNA_SmoothModifier;

source/blender/makesrna/intern/rna_modifier.c

@@ -29,7 +29,6 @@
 #include "DNA_object_force_types.h"
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
-#include "DNA_simulation_types.h"
 
 #include "MEM_guardedalloc.h"
 
@@ -161,6 +160,7 @@ const EnumPropertyItem rna_enum_object_modifier_type_items[] = {
      ICON_MOD_MULTIRES,
      "Multiresolution",
      "Subdivide the mesh in a way that allows editing the higher subdivision levels"},
+    {eModifierType_Nodes, "NODES", ICON_MESH_DATA, "Nodes", ""}, /* TODO: Use correct icon. */
     {eModifierType_Remesh,
      "REMESH",
      ICON_MOD_REMESH,
@@ -305,11 +305,6 @@ const EnumPropertyItem rna_enum_object_modifier_type_items[] = {
      "Spawn particles from the shape"},
     {eModifierType_Softbody, "SOFT_BODY", ICON_MOD_SOFT, "Soft Body", ""},
     {eModifierType_Surface, "SURFACE", ICON_MODIFIER, "Surface", ""},
-    {eModifierType_Simulation,
-     "SIMULATION",
-     ICON_PHYSICS,
-     "Simulation",
-     ""}, /* TODO: Use correct icon. */
     {0, NULL, 0, NULL, NULL},
 };
 
@@ -1602,6 +1597,14 @@ static int rna_MeshSequenceCacheModifier_read_velocity_get(PointerRNA *ptr)
 #  endif
 }
 
+static bool rna_NodesModifier_node_group_poll(PointerRNA *ptr, PointerRNA value)
+{
+  NodesModifierData *nmd = ptr->data;
+  bNodeTree *ntree = value.data;
+  UNUSED_VARS(nmd, ntree);
+  return true;
+}
+
 #else
 
 /* NOTE: *MUST* return subdivision_type property. */
@@ -6920,17 +6923,24 @@ static void rna_def_modifier_weightednormal(BlenderRNA *brna)
 }
 
 #  ifdef WITH_GEOMETRY_NODES
-static void rna_def_modifier_simulation(BlenderRNA *brna)
+static void rna_def_modifier_nodes(BlenderRNA *brna)
 {
   StructRNA *srna;
+  PropertyRNA *prop;
 
-  srna = RNA_def_struct(brna, "SimulationModifier", "Modifier");
-  RNA_def_struct_ui_text(srna, "Simulation Modifier", "");
-  RNA_def_struct_sdna(srna, "SimulationModifierData");
-  RNA_def_struct_ui_icon(srna, ICON_PHYSICS); /* TODO: Use correct icon. */
+  srna = RNA_def_struct(brna, "NodesModifier", "Modifier");
+  RNA_def_struct_ui_text(srna, "Nodes Modifier", "");
+  RNA_def_struct_sdna(srna, "NodesModifierData");
+  RNA_def_struct_ui_icon(srna, ICON_MESH_DATA); /* TODO: Use correct icon. */
 
   RNA_define_lib_overridable(true);
 
+  prop = RNA_def_property(srna, "node_group", PROP_POINTER, PROP_NONE);
+  RNA_def_property_ui_text(prop, "Node Group", "Node group that controls what this modifier does");
+  RNA_def_property_pointer_funcs(prop, NULL, NULL, NULL, "rna_NodesModifier_node_group_poll");
+  RNA_def_property_flag(prop, PROP_EDITABLE);
+  RNA_def_property_update(prop, 0, "rna_Modifier_dependency_update");
+
   RNA_define_lib_overridable(false);
 }
 #  endif
@@ -7290,7 +7300,7 @@ void RNA_def_modifier(BlenderRNA *brna)
   rna_def_modifier_surfacedeform(brna);
   rna_def_modifier_weightednormal(brna);
 #  ifdef WITH_GEOMETRY_NODES
-  rna_def_modifier_simulation(brna);
+  rna_def_modifier_nodes(brna);
 #  endif
   rna_def_modifier_mesh_to_volume(brna);
   rna_def_modifier_volume_displace(brna);

source/blender/makesrna/intern/rna_nodetree.c

@@ -38,7 +38,6 @@
 #include "BKE_animsys.h"
 #include "BKE_image.h"
 #include "BKE_node.h"
-#include "BKE_simulation.h"
 #include "BKE_texture.h"
 
 #include "RNA_access.h"
@@ -84,6 +83,7 @@ static const EnumPropertyItem node_socket_type_items[] = {
     {SOCK_SHADER, "SHADER", 0, "Shader", ""},
     {SOCK_OBJECT, "OBJECT", 0, "Object", ""},
     {SOCK_IMAGE, "IMAGE", 0, "Image", ""},
+    {SOCK_GEOMETRY, "GEOMETRY", 0, "Geometry", ""},
     {0, NULL, 0, NULL, NULL},
 };
 
@@ -96,6 +96,7 @@ static const EnumPropertyItem node_socket_data_type_items[] = {
     {SOCK_RGBA, "RGBA", 0, "Color", ""},
     {SOCK_OBJECT, "OBJECT", 0, "Object", ""},
     {SOCK_IMAGE, "IMAGE", 0, "Image", ""},
+    {SOCK_GEOMETRY, "GEOMETRY", 0, "Geometry", ""},
     {0, NULL, 0, NULL, NULL},
 };
 
@@ -725,9 +726,9 @@ static const EnumPropertyItem *rna_node_static_type_itemf(bContext *UNUSED(C),
 #  undef DefNode
   }
 
-  if (RNA_struct_is_a(ptr->type, &RNA_SimulationNode)) {
+  if (RNA_struct_is_a(ptr->type, &RNA_GeometryNode)) {
 #  define DefNode(Category, ID, DefFunc, EnumName, StructName, UIName, UIDesc) \
-    if (STREQ(#Category, "SimulationNode")) { \
+    if (STREQ(#Category, "GeometryNode")) { \
       tmp.value = ID; \
       tmp.identifier = EnumName; \
       tmp.name = UIName; \
@@ -1868,16 +1869,16 @@ static StructRNA *rna_TextureNode_register(Main *bmain,
   return nt->rna_ext.srna;
 }
 
-static StructRNA *rna_SimulationNode_register(Main *bmain,
-                                              ReportList *reports,
-                                              void *data,
-                                              const char *identifier,
-                                              StructValidateFunc validate,
-                                              StructCallbackFunc call,
-                                              StructFreeFunc free)
+static StructRNA *rna_GeometryNode_register(Main *bmain,
+                                            ReportList *reports,
+                                            void *data,
+                                            const char *identifier,
+                                            StructValidateFunc validate,
+                                            StructCallbackFunc call,
+                                            StructFreeFunc free)
 {
   bNodeType *nt = rna_Node_register_base(
-      bmain, reports, &RNA_SimulationNode, data, identifier, validate, call, free);
+      bmain, reports, &RNA_GeometryNode, data, identifier, validate, call, free);
   if (!nt) {
     return NULL;
   }
@@ -8177,14 +8178,14 @@ static void rna_def_texture_node(BlenderRNA *brna)
   RNA_def_struct_register_funcs(srna, "rna_TextureNode_register", "rna_Node_unregister", NULL);
 }
 
-static void rna_def_simulation_node(BlenderRNA *brna)
+static void rna_def_geometry_node(BlenderRNA *brna)
 {
   StructRNA *srna;
 
-  srna = RNA_def_struct(brna, "SimulationNode", "NodeInternal");
-  RNA_def_struct_ui_text(srna, "Simulation Node", "");
+  srna = RNA_def_struct(brna, "GeometryNode", "NodeInternal");
+  RNA_def_struct_ui_text(srna, "Geometry Node", "");
   RNA_def_struct_sdna(srna, "bNode");
-  RNA_def_struct_register_funcs(srna, "rna_SimulationNode_register", "rna_Node_unregister", NULL);
+  RNA_def_struct_register_funcs(srna, "rna_GeometryNode_register", "rna_Node_unregister", NULL);
 }
 
 static void rna_def_function_node(BlenderRNA *brna)
@@ -8831,6 +8832,21 @@ static void rna_def_node_socket_image(BlenderRNA *brna,
   RNA_def_property_update(prop, NC_NODE | NA_EDITED, "rna_NodeSocketInterface_update");
 }
 
+static void rna_def_node_socket_geometry(BlenderRNA *brna,
+                                         const char *identifier,
+                                         const char *interface_idname)
+{
+  StructRNA *srna;
+
+  srna = RNA_def_struct(brna, identifier, "NodeSocketStandard");
+  RNA_def_struct_ui_text(srna, "Geometry Node Socket", "Geometry socket of a node");
+  RNA_def_struct_sdna(srna, "bNodeSocket");
+
+  srna = RNA_def_struct(brna, interface_idname, "NodeSocketInterfaceStandard");
+  RNA_def_struct_ui_text(srna, "Geometry Node Socket Interface", "Geometry socket of a node");
+  RNA_def_struct_sdna(srna, "bNodeSocket");
+}
+
 static void rna_def_node_socket_standard_types(BlenderRNA *brna)
 {
   /* XXX Workaround: Registered functions are not exposed in python by bpy,
@@ -8969,6 +8985,8 @@ static void rna_def_node_socket_standard_types(BlenderRNA *brna)
   rna_def_node_socket_object(brna, "NodeSocketObject", "NodeSocketInterfaceObject");
 
   rna_def_node_socket_image(brna, "NodeSocketImage", "NodeSocketInterfaceImage");
+
+  rna_def_node_socket_geometry(brna, "NodeSocketGeometry", "NodeSocketInterfaceGeometry");
 }
 
 static void rna_def_internal_node(BlenderRNA *brna)
@@ -9606,7 +9624,7 @@ static void rna_def_nodetree(BlenderRNA *brna)
       {NTREE_SHADER, "SHADER", ICON_MATERIAL, "Shader", "Shader nodes"},
       {NTREE_TEXTURE, "TEXTURE", ICON_TEXTURE, "Texture", "Texture nodes"},
       {NTREE_COMPOSIT, "COMPOSITING", ICON_RENDERLAYERS, "Compositing", "Compositing nodes"},
-      {NTREE_SIMULATION, "SIMULATION", ICON_PHYSICS, "Simulation", "Simulation nodes"},
+      {NTREE_GEOMETRY, "GEOMETRY", ICON_MESH_DATA, "Geometry", "Geometry nodes"},
       {0, NULL, 0, NULL, NULL},
   };
 
@@ -9830,15 +9848,15 @@ static void rna_def_texture_nodetree(BlenderRNA *brna)
   RNA_def_struct_ui_icon(srna, ICON_TEXTURE);
 }
 
-static void rna_def_simulation_nodetree(BlenderRNA *brna)
+static void rna_def_geometry_nodetree(BlenderRNA *brna)
 {
   StructRNA *srna;
 
-  srna = RNA_def_struct(brna, "SimulationNodeTree", "NodeTree");
+  srna = RNA_def_struct(brna, "GeometryNodeTree", "NodeTree");
   RNA_def_struct_ui_text(
-      srna, "Simulation Node Tree", "Node tree consisting of linked nodes used for simulations");
+      srna, "Geometry Node Tree", "Node tree consisting of linked nodes used for geometries");
   RNA_def_struct_sdna(srna, "bNodeTree");
-  RNA_def_struct_ui_icon(srna, ICON_PHYSICS); /* TODO: Use correct icon. */
+  RNA_def_struct_ui_icon(srna, ICON_MESH_DATA); /* TODO: Use correct icon. */
 }
 
 static StructRNA *define_specific_node(BlenderRNA *brna,
@@ -9927,7 +9945,7 @@ void RNA_def_nodetree(BlenderRNA *brna)
   rna_def_shader_node(brna);
   rna_def_compositor_node(brna);
   rna_def_texture_node(brna);
-  rna_def_simulation_node(brna);
+  rna_def_geometry_node(brna);
   rna_def_function_node(brna);
 
   rna_def_nodetree(brna);
@@ -9937,7 +9955,7 @@ void RNA_def_nodetree(BlenderRNA *brna)
   rna_def_composite_nodetree(brna);
   rna_def_shader_nodetree(brna);
   rna_def_texture_nodetree(brna);
-  rna_def_simulation_nodetree(brna);
+  rna_def_geometry_nodetree(brna);
 
 #  define DefNode(Category, ID, DefFunc, EnumName, StructName, UIName, UIDesc) \
     { \
@@ -9954,13 +9972,13 @@ void RNA_def_nodetree(BlenderRNA *brna)
    */
 #  include "../../nodes/NOD_static_types.h"
 
-  /* Node group types need to be defined for shader, compositor, texture, simulation nodes
+  /* Node group types need to be defined for shader, compositor, texture, geometry nodes
    * individually. Cannot use the static types header for this, since they share the same int id.
    */
   define_specific_node(brna, "ShaderNodeGroup", "ShaderNode", "Group", "", def_group);
   define_specific_node(brna, "CompositorNodeGroup", "CompositorNode", "Group", "", def_group);
   define_specific_node(brna, "TextureNodeGroup", "TextureNode", "Group", "", def_group);
-  define_specific_node(brna, "SimulationNodeGroup", "SimulationNode", "Group", "", def_group);
+  define_specific_node(brna, "GeometryNodeGroup", "GeometryNode", "Group", "", def_group);
   def_custom_group(brna,
                    "ShaderNodeCustomGroup",
                    "ShaderNode",

source/blender/makesrna/intern/rna_space.c

@@ -45,7 +45,6 @@
 #include "DNA_node_types.h"
 #include "DNA_object_types.h"
 #include "DNA_sequence_types.h"
-#include "DNA_simulation_types.h"
 #include "DNA_space_types.h"
 #include "DNA_view3d_types.h"
 #include "DNA_workspace_types.h"
@@ -2178,40 +2177,6 @@ static void rna_SpaceNodeEditor_node_tree_update(const bContext *C, PointerRNA *
   ED_node_tree_update(C);
 }
 
-#  ifdef WITH_GEOMETRY_NODES
-static PointerRNA rna_SpaceNodeEditor_simulation_get(PointerRNA *ptr)
-{
-  SpaceNode *snode = (SpaceNode *)ptr->data;
-  ID *id = snode->id;
-  if (id && GS(id->name) == ID_SIM) {
-    return rna_pointer_inherit_refine(ptr, &RNA_Simulation, snode->id);
-  }
-  else {
-    return PointerRNA_NULL;
-  }
-}
-
-static void rna_SpaceNodeEditor_simulation_set(PointerRNA *ptr,
-                                               const PointerRNA value,
-                                               struct ReportList *UNUSED(reports))
-{
-  SpaceNode *snode = (SpaceNode *)ptr->data;
-  if (!STREQ(snode->tree_idname, "SimulationNodeTree")) {
-    return;
-  }
-
-  Simulation *sim = (Simulation *)value.data;
-  if (sim != NULL) {
-    bNodeTree *ntree = sim->nodetree;
-    ED_node_tree_start(snode, ntree, NULL, NULL);
-  }
-  else {
-    ED_node_tree_start(snode, NULL, NULL, NULL);
-  }
-  snode->id = &sim->id;
-}
-#  endif
-
 static int rna_SpaceNodeEditor_tree_type_get(PointerRNA *ptr)
 {
   SpaceNode *snode = (SpaceNode *)ptr->data;
@@ -6347,19 +6312,6 @@ static void rna_def_space_node(BlenderRNA *brna)
   RNA_def_property_ui_text(
       prop, "ID From", "Data-block from which the edited data-block is linked");
 
-#  ifdef WITH_GEOMETRY_NODES
-  prop = RNA_def_property(srna, "simulation", PROP_POINTER, PROP_NONE);
-  RNA_def_property_flag(prop, PROP_EDITABLE);
-  RNA_def_property_struct_type(prop, "Simulation");
-  RNA_def_property_ui_text(prop, "Simulation", "Simulation that is being edited");
-  RNA_def_property_pointer_funcs(prop,
-                                 "rna_SpaceNodeEditor_simulation_get",
-                                 "rna_SpaceNodeEditor_simulation_set",
-                                 NULL,
-                                 NULL);
-  RNA_def_property_update(prop, NC_SPACE | ND_SPACE_NODE, NULL);
-#  endif
-
   prop = RNA_def_property(srna, "path", PROP_COLLECTION, PROP_NONE);
   RNA_def_property_collection_sdna(prop, NULL, "treepath", NULL);
   RNA_def_property_struct_type(prop, "NodeTreePath");

source/blender/modifiers/CMakeLists.txt

@@ -29,8 +29,10 @@ set(INC
   ../bmesh
   ../depsgraph
   ../editors/include
+  ../functions
   ../makesdna
   ../makesrna
+  ../nodes
   ../render/extern/include
   ../windowmanager
   ../../../intern/eigen
@@ -86,7 +88,7 @@ set(SRC
   intern/MOD_shapekey.c
   intern/MOD_shrinkwrap.c
   intern/MOD_simpledeform.c
-  intern/MOD_simulation.cc
+  intern/MOD_nodes.cc
   intern/MOD_skin.c
   intern/MOD_smooth.c
   intern/MOD_softbody.c

source/blender/modifiers/MOD_modifiertypes.h

@@ -85,7 +85,7 @@ extern ModifierTypeInfo modifierType_CorrectiveSmooth;
 extern ModifierTypeInfo modifierType_MeshSequenceCache;
 extern ModifierTypeInfo modifierType_SurfaceDeform;
 extern ModifierTypeInfo modifierType_WeightedNormal;
-extern ModifierTypeInfo modifierType_Simulation;
+extern ModifierTypeInfo modifierType_Nodes;
 extern ModifierTypeInfo modifierType_MeshToVolume;
 extern ModifierTypeInfo modifierType_VolumeDisplace;
 extern ModifierTypeInfo modifierType_VolumeToMesh;

source/blender/modifiers/intern/MOD_edgesplit.c

@@ -53,7 +53,10 @@
 #include "MOD_modifiertypes.h"
 #include "MOD_ui_common.h"
 
-static Mesh *doEdgeSplit(Mesh *mesh, EdgeSplitModifierData *emd)
+/* For edge split modifier node. */
+Mesh *doEdgeSplit(Mesh *mesh, EdgeSplitModifierData *emd);
+
+Mesh *doEdgeSplit(Mesh *mesh, EdgeSplitModifierData *emd)
 {
   Mesh *result;
   BMesh *bm;

source/blender/modifiers/intern/MOD_nodes.cc

@@ -0,0 +1,436 @@
+/*
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2005 by the Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup modifiers
+ */
+
+#include <cstring>
+#include <iostream>
+#include <string>
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_float3.hh"
+#include "BLI_listbase.h"
+#include "BLI_string.h"
+#include "BLI_utildefines.h"
+
+#include "DNA_defaults.h"
+#include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
+#include "DNA_modifier_types.h"
+#include "DNA_node_types.h"
+#include "DNA_object_types.h"
+#include "DNA_pointcloud_types.h"
+#include "DNA_scene_types.h"
+#include "DNA_screen_types.h"
+
+#include "BKE_customdata.h"
+#include "BKE_lib_query.h"
+#include "BKE_mesh.h"
+#include "BKE_modifier.h"
+#include "BKE_pointcloud.h"
+#include "BKE_screen.h"
+#include "BKE_simulation.h"
+
+#include "BLO_read_write.h"
+
+#include "UI_interface.h"
+#include "UI_resources.h"
+
+#include "RNA_access.h"
+
+#include "DEG_depsgraph_build.h"
+#include "DEG_depsgraph_query.h"
+
+#include "MOD_modifiertypes.h"
+#include "MOD_ui_common.h"
+
+#include "NOD_derived_node_tree.hh"
+#include "NOD_geometry_exec.hh"
+#include "NOD_node_tree_multi_function.hh"
+#include "NOD_type_callbacks.hh"
+
+using blender::float3;
+
+static void initData(ModifierData *md)
+{
+  NodesModifierData *nmd = (NodesModifierData *)md;
+
+  BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(nmd, modifier));
+
+  MEMCPY_STRUCT_AFTER(nmd, DNA_struct_default_get(NodesModifierData), modifier);
+}
+
+static void updateDepsgraph(ModifierData *md, const ModifierUpdateDepsgraphContext *ctx)
+{
+  NodesModifierData *nmd = reinterpret_cast<NodesModifierData *>(md);
+  if (nmd->node_group != nullptr) {
+    DEG_add_node_tree_relation(ctx->node, nmd->node_group, "Nodes Modifier");
+  }
+}
+
+static void foreachIDLink(ModifierData *md, Object *ob, IDWalkFunc walk, void *userData)
+{
+  NodesModifierData *nmd = reinterpret_cast<NodesModifierData *>(md);
+  walk(userData, ob, (ID **)&nmd->node_group, IDWALK_CB_USER);
+}
+
+static bool isDisabled(const struct Scene *UNUSED(scene),
+                       ModifierData *md,
+                       bool UNUSED(useRenderParams))
+{
+  NodesModifierData *nmd = reinterpret_cast<NodesModifierData *>(md);
+  UNUSED_VARS(nmd);
+  return false;
+}
+
+static PointCloud *modifyPointCloud(ModifierData *md,
+                                    const ModifierEvalContext *UNUSED(ctx),
+                                    PointCloud *pointcloud)
+{
+  NodesModifierData *nmd = reinterpret_cast<NodesModifierData *>(md);
+  UNUSED_VARS(nmd);
+  std::cout << __func__ << "\n";
+  return pointcloud;
+}
+
+/* To be replaced soon. */
+using namespace blender;
+using namespace blender::nodes;
+using namespace blender::fn;
+using namespace blender::bke;
+
+class GeometryNodesEvaluator {
+ private:
+  LinearAllocator<> allocator_;
+  const DerivedNodeTree &tree_;
+  Map<const DOutputSocket *, GMutablePointer> group_input_data_;
+  Vector<const DInputSocket *> group_outputs_;
+  MultiFunctionByNode &mf_by_node_;
+  const DataTypeConversions &conversions_;
+
+ public:
+  GeometryNodesEvaluator(const DerivedNodeTree &tree,
+                         Map<const DOutputSocket *, GMutablePointer> group_input_data,
+                         Vector<const DInputSocket *> group_outputs,
+                         MultiFunctionByNode &mf_by_node)
+      : tree_(tree),
+        group_input_data_(std::move(group_input_data)),
+        group_outputs_(std::move(group_outputs)),
+        mf_by_node_(mf_by_node),
+        conversions_(get_implicit_type_conversions())
+  {
+  }
+
+  Vector<GMutablePointer> execute()
+  {
+    Vector<GMutablePointer> results;
+    for (const DInputSocket *group_output : group_outputs_) {
+      const CPPType &type = *socket_cpp_type_get(*group_output->typeinfo());
+      void *result_buffer = allocator_.allocate(type.size(), type.alignment());
+      this->compute_input_socket(*group_output, result_buffer);
+      results.append(GMutablePointer{type, result_buffer});
+    }
+    for (GMutablePointer value : group_input_data_.values()) {
+      value.type()->destruct(value.get());
+    }
+    return results;
+  }
+
+ private:
+  void compute_input_socket(const DInputSocket &socket_to_compute, void *r_value)
+  {
+    Span<const DOutputSocket *> from_sockets = socket_to_compute.linked_sockets();
+    Span<const DGroupInput *> from_group_inputs = socket_to_compute.linked_group_inputs();
+    const int total_inputs = from_sockets.size() + from_group_inputs.size();
+    BLI_assert(total_inputs <= 1);
+
+    if (total_inputs == 0) {
+      bNodeSocket &bsocket = *socket_to_compute.bsocket();
+      socket_cpp_value_get(bsocket, r_value);
+      return;
+    }
+    if (from_group_inputs.size() == 1) {
+      bNodeSocket &bsocket = *from_group_inputs[0]->bsocket();
+      socket_cpp_value_get(bsocket, r_value);
+      return;
+    }
+
+    const DOutputSocket &from_socket = *from_sockets[0];
+    const CPPType &from_type = *socket_cpp_type_get(*from_socket.typeinfo());
+    const CPPType &to_type = *socket_cpp_type_get(*socket_to_compute.typeinfo());
+    if (from_type == to_type) {
+      this->compute_output_socket(from_socket, r_value);
+    }
+    else {
+      /* The type of both sockets don't match, so a conversion is necessary. */
+      if (conversions_.is_convertible(from_type, to_type)) {
+        void *from_value = allocator_.allocate(from_type.size(), from_type.alignment());
+        this->compute_output_socket(from_socket, from_value);
+        conversions_.convert(from_type, to_type, from_value, r_value);
+        from_type.destruct(from_value);
+      }
+      else {
+        /* Use a default value when the types cannot be converted. */
+        to_type.copy_to_uninitialized(to_type.default_value(), r_value);
+      }
+    }
+  }
+
+  void compute_output_socket(const DOutputSocket &socket_to_compute, void *r_value)
+  {
+    const GMutablePointer *group_input = group_input_data_.lookup_ptr(&socket_to_compute);
+    if (group_input != nullptr) {
+      const CPPType &type = *group_input->type();
+      type.copy_to_uninitialized(group_input->get(), r_value);
+      return;
+    }
+
+    const DNode &node = socket_to_compute.node();
+    GValueByName node_inputs{allocator_};
+
+    /* Compute all inputs for the node. */
+    for (const DInputSocket *input_socket : node.inputs()) {
+      const CPPType &type = *socket_cpp_type_get(*input_socket->typeinfo());
+      void *buffer = allocator_.allocate(type.size(), type.alignment());
+      compute_input_socket(*input_socket, buffer);
+      node_inputs.move_in(input_socket->identifier(), GMutablePointer{type, buffer});
+      type.destruct(buffer);
+    }
+
+    /* Execute the node itself. */
+    GValueByName node_outputs{allocator_};
+    this->execute_node(node, node_inputs, node_outputs);
+
+    /* Pass relevant value to the caller. */
+    bNodeSocket *bsocket_to_compute = socket_to_compute.bsocket();
+    const CPPType &type_to_compute = *socket_cpp_type_get(*bsocket_to_compute->typeinfo);
+    GMutablePointer computed_value = node_outputs.extract(bsocket_to_compute->identifier);
+    type_to_compute.relocate_to_uninitialized(computed_value.get(), r_value);
+  }
+
+  void execute_node(const DNode &node, GValueByName &node_inputs, GValueByName &node_outputs)
+  {
+    bNode *bnode = node.bnode();
+    if (bnode->typeinfo->geometry_node_execute != nullptr) {
+      bnode->typeinfo->geometry_node_execute(bnode, node_inputs, node_outputs);
+      return;
+    }
+
+    /* Use the multi-function implementation of the node. */
+    const MultiFunction &fn = *mf_by_node_.lookup(&node);
+    MFContextBuilder context;
+    MFParamsBuilder params{fn, 1};
+    Vector<GMutablePointer> input_data;
+    for (const DInputSocket *dsocket : node.inputs()) {
+      if (dsocket->is_available()) {
+        GMutablePointer data = node_inputs.extract(dsocket->identifier());
+        params.add_readonly_single_input(GSpan(*data.type(), data.get(), 1));
+        input_data.append(data);
+      }
+    }
+    Vector<GMutablePointer> output_data;
+    for (const DOutputSocket *dsocket : node.outputs()) {
+      if (dsocket->is_available()) {
+        const CPPType &type = *socket_cpp_type_get(*dsocket->typeinfo());
+        void *buffer = allocator_.allocate(type.size(), type.alignment());
+        params.add_uninitialized_single_output(GMutableSpan(type, buffer, 1));
+        output_data.append(GMutablePointer(type, buffer));
+      }
+    }
+    fn.call(IndexRange(1), params, context);
+    for (GMutablePointer value : input_data) {
+      value.destruct();
+    }
+    for (const int i : node.outputs().index_range()) {
+      GMutablePointer value = output_data[i];
+      node_outputs.move_in(node.output(i).identifier(), value);
+      value.destruct();
+    }
+  }
+};
+
+/**
+ * Evaluate a node group to compute the output geometry.
+ * Currently, this uses a fairly basic and inefficient algorithm that might compute things more
+ * often than necessary. It's going to be replaced soon.
+ */
+static GeometryPtr compute_geometry(const DerivedNodeTree &tree,
+                                    const DOutputSocket *group_input,
+                                    GeometryPtr group_input_geometry,
+                                    const DInputSocket &socket_to_compute)
+{
+  ResourceCollector resources;
+  MultiFunctionByNode mf_by_node = get_multi_function_per_node(tree, resources);
+
+  /* Use this buffer so that it is not destructed when the scope ends. The evaluator is responsible
+   * for destructing it. */
+  TypedBuffer<GeometryPtr> buffer;
+  new (buffer.ptr()) GeometryPtr(std::move(group_input_geometry));
+
+  Map<const DOutputSocket *, GMutablePointer> group_inputs;
+  group_inputs.add_new(group_input, GMutablePointer{buffer.ptr()});
+
+  Vector<const DInputSocket *> group_outputs;
+  group_outputs.append(&socket_to_compute);
+
+  GeometryNodesEvaluator evaluator{tree, group_inputs, group_outputs, mf_by_node};
+  Vector<GMutablePointer> results = evaluator.execute();
+  BLI_assert(results.size() == 1);
+  GMutablePointer result = results[0];
+
+  GeometryPtr output_geometry = std::move(*(GeometryPtr *)result.get());
+  return output_geometry;
+}
+
+static Mesh *modifyMesh(ModifierData *md, const ModifierEvalContext *UNUSED(ctx), Mesh *mesh)
+{
+  NodesModifierData *nmd = reinterpret_cast<NodesModifierData *>(md);
+  if (nmd->node_group == nullptr) {
+    return mesh;
+  }
+
+  NodeTreeRefMap tree_refs;
+  DerivedNodeTree tree{nmd->node_group, tree_refs};
+  ResourceCollector resources;
+
+  Span<const DNode *> input_nodes = tree.nodes_by_type("NodeGroupInput");
+  Span<const DNode *> output_nodes = tree.nodes_by_type("NodeGroupOutput");
+
+  if (input_nodes.size() > 1) {
+    return mesh;
+  }
+  if (output_nodes.size() != 1) {
+    return mesh;
+  }
+
+  Span<const DOutputSocket *> group_inputs = (input_nodes.size() == 1) ?
+                                                 input_nodes[0]->outputs().drop_back(1) :
+                                                 Span<const DOutputSocket *>{};
+  Span<const DInputSocket *> group_outputs = output_nodes[0]->inputs().drop_back(1);
+
+  if (group_outputs.size() != 1) {
+    return mesh;
+  }
+
+  const DInputSocket *group_output = group_outputs[0];
+  if (group_output->idname() != "NodeSocketGeometry") {
+    return mesh;
+  }
+
+  GeometryPtr input_geometry{new Geometry()};
+  input_geometry->mesh_set_and_keep_ownership(mesh);
+
+  GeometryPtr new_geometry = compute_geometry(
+      tree, group_inputs[0], std::move(input_geometry), *group_outputs[0]);
+  make_geometry_mutable(new_geometry);
+  Mesh *new_mesh = new_geometry->mesh_release();
+  if (new_mesh == nullptr) {
+    return BKE_mesh_new_nomain(0, 0, 0, 0, 0);
+  }
+  return new_mesh;
+}
+
+static void panel_draw(const bContext *UNUSED(C), Panel *panel)
+{
+  uiLayout *layout = panel->layout;
+
+  PointerRNA ob_ptr;
+  PointerRNA *ptr = modifier_panel_get_property_pointers(panel, &ob_ptr);
+
+  uiLayoutSetPropSep(layout, true);
+  uiLayoutSetPropDecorate(layout, false);
+
+  uiItemR(layout, ptr, "node_group", 0, NULL, ICON_MESH_DATA);
+
+  modifier_panel_end(layout, ptr);
+}
+
+static void panelRegister(ARegionType *region_type)
+{
+  modifier_panel_register(region_type, eModifierType_Nodes, panel_draw);
+}
+
+static void blendWrite(BlendWriter *writer, const ModifierData *md)
+{
+  const NodesModifierData *nmd = reinterpret_cast<const NodesModifierData *>(md);
+  UNUSED_VARS(nmd, writer);
+}
+
+static void blendRead(BlendDataReader *reader, ModifierData *md)
+{
+  NodesModifierData *nmd = reinterpret_cast<NodesModifierData *>(md);
+  UNUSED_VARS(nmd, reader);
+}
+
+static void copyData(const ModifierData *md, ModifierData *target, const int flag)
+{
+  const NodesModifierData *nmd = reinterpret_cast<const NodesModifierData *>(md);
+  NodesModifierData *tnmd = reinterpret_cast<NodesModifierData *>(target);
+  UNUSED_VARS(nmd, tnmd);
+
+  BKE_modifier_copydata_generic(md, target, flag);
+}
+
+static void freeData(ModifierData *md)
+{
+  NodesModifierData *nmd = reinterpret_cast<NodesModifierData *>(md);
+  UNUSED_VARS(nmd);
+}
+
+ModifierTypeInfo modifierType_Nodes = {
+    /* name */ "Nodes",
+    /* structName */ "NodesModifierData",
+    /* structSize */ sizeof(NodesModifierData),
+#ifdef WITH_GEOMETRY_NODES
+    /* srna */ &RNA_NodesModifier,
+#else
+    /* srna */ &RNA_Modifier,
+#endif
+    /* type */ eModifierTypeType_Constructive,
+    /* flags */ eModifierTypeFlag_AcceptsMesh,
+    /* icon */ ICON_MESH_DATA, /* TODO: Use correct icon. */
+
+    /* copyData */ copyData,
+
+    /* deformVerts */ NULL,
+    /* deformMatrices */ NULL,
+    /* deformVertsEM */ NULL,
+    /* deformMatricesEM */ NULL,
+    /* modifyMesh */ modifyMesh,
+    /* modifyHair */ NULL,
+    /* modifyPointCloud */ modifyPointCloud,
+    /* modifyVolume */ NULL,
+
+    /* initData */ initData,
+    /* requiredDataMask */ NULL,
+    /* freeData */ freeData,
+    /* isDisabled */ isDisabled,
+    /* updateDepsgraph */ updateDepsgraph,
+    /* dependsOnTime */ NULL,
+    /* dependsOnNormals */ NULL,
+    /* foreachIDLink */ foreachIDLink,
+    /* foreachTexLink */ NULL,
+    /* freeRuntimeData */ NULL,
+    /* panelRegister */ panelRegister,
+    /* blendWrite */ blendWrite,
+    /* blendRead */ blendRead,
+};

source/blender/modifiers/intern/MOD_simulation.cc

@@ -1,194 +0,0 @@
-/*
- * 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.
- *
- * The Original Code is Copyright (C) 2005 by the Blender Foundation.
- * All rights reserved.
- */
-
-/** \file
- * \ingroup modifiers
- */
-
-#include <cstring>
-#include <iostream>
-#include <string>
-
-#include "MEM_guardedalloc.h"
-
-#include "BLI_float3.hh"
-#include "BLI_listbase.h"
-#include "BLI_string.h"
-#include "BLI_utildefines.h"
-
-#include "DNA_defaults.h"
-#include "DNA_mesh_types.h"
-#include "DNA_meshdata_types.h"
-#include "DNA_modifier_types.h"
-#include "DNA_object_types.h"
-#include "DNA_pointcloud_types.h"
-#include "DNA_scene_types.h"
-#include "DNA_screen_types.h"
-#include "DNA_simulation_types.h"
-
-#include "BKE_customdata.h"
-#include "BKE_lib_query.h"
-#include "BKE_mesh.h"
-#include "BKE_modifier.h"
-#include "BKE_pointcloud.h"
-#include "BKE_screen.h"
-#include "BKE_simulation.h"
-
-#include "BLO_read_write.h"
-
-#include "UI_interface.h"
-#include "UI_resources.h"
-
-#include "RNA_access.h"
-
-#include "DEG_depsgraph_build.h"
-#include "DEG_depsgraph_query.h"
-
-#include "MOD_modifiertypes.h"
-#include "MOD_ui_common.h"
-
-using blender::float3;
-
-static void initData(ModifierData *md)
-{
-  SimulationModifierData *smd = (SimulationModifierData *)md;
-
-  BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(smd, modifier));
-
-  MEMCPY_STRUCT_AFTER(smd, DNA_struct_default_get(SimulationModifierData), modifier);
-}
-
-static void updateDepsgraph(ModifierData *md, const ModifierUpdateDepsgraphContext *UNUSED(ctx))
-{
-  SimulationModifierData *smd = reinterpret_cast<SimulationModifierData *>(md);
-  UNUSED_VARS(smd);
-}
-
-static void foreachIDLink(ModifierData *md,
-                          Object *UNUSED(ob),
-                          IDWalkFunc UNUSED(walk),
-                          void *UNUSED(userData))
-{
-  SimulationModifierData *smd = reinterpret_cast<SimulationModifierData *>(md);
-  UNUSED_VARS(smd);
-}
-
-static bool isDisabled(const struct Scene *UNUSED(scene),
-                       ModifierData *md,
-                       bool UNUSED(useRenderParams))
-{
-  SimulationModifierData *smd = reinterpret_cast<SimulationModifierData *>(md);
-  UNUSED_VARS(smd);
-  return false;
-}
-
-static PointCloud *modifyPointCloud(ModifierData *md,
-                                    const ModifierEvalContext *UNUSED(ctx),
-                                    PointCloud *pointcloud)
-{
-  SimulationModifierData *smd = reinterpret_cast<SimulationModifierData *>(md);
-  UNUSED_VARS(smd);
-  return pointcloud;
-}
-
-static void panel_draw(const bContext *UNUSED(C), Panel *panel)
-{
-  uiLayout *layout = panel->layout;
-
-  PointerRNA ob_ptr;
-  PointerRNA *ptr = modifier_panel_get_property_pointers(panel, &ob_ptr);
-
-  uiLayoutSetPropSep(layout, true);
-  uiLayoutSetPropDecorate(layout, false);
-
-  uiItemL(layout, "This modifier does nothing currently", ICON_INFO);
-
-  modifier_panel_end(layout, ptr);
-}
-
-static void panelRegister(ARegionType *region_type)
-{
-  modifier_panel_register(region_type, eModifierType_Simulation, panel_draw);
-}
-
-static void blendWrite(BlendWriter *writer, const ModifierData *md)
-{
-  const SimulationModifierData *smd = reinterpret_cast<const SimulationModifierData *>(md);
-  UNUSED_VARS(smd, writer);
-}
-
-static void blendRead(BlendDataReader *reader, ModifierData *md)
-{
-  SimulationModifierData *smd = reinterpret_cast<SimulationModifierData *>(md);
-  UNUSED_VARS(smd, reader);
-}
-
-static void copyData(const ModifierData *md, ModifierData *target, const int flag)
-{
-  const SimulationModifierData *smd = reinterpret_cast<const SimulationModifierData *>(md);
-  SimulationModifierData *tsmd = reinterpret_cast<SimulationModifierData *>(target);
-  UNUSED_VARS(smd, tsmd);
-
-  BKE_modifier_copydata_generic(md, target, flag);
-}
-
-static void freeData(ModifierData *md)
-{
-  SimulationModifierData *smd = reinterpret_cast<SimulationModifierData *>(md);
-  UNUSED_VARS(smd);
-}
-
-ModifierTypeInfo modifierType_Simulation = {
-    /* name */ "Simulation",
-    /* structName */ "SimulationModifierData",
-    /* structSize */ sizeof(SimulationModifierData),
-#ifdef WITH_GEOMETRY_NODES
-    /* srna */ &RNA_SimulationModifier,
-#else
-    /* srna */ &RNA_Modifier,
-#endif
-    /* type */ eModifierTypeType_None,
-    /* flags */ (ModifierTypeFlag)0,
-    /* icon */ ICON_PHYSICS, /* TODO: Use correct icon. */
-
-    /* copyData */ copyData,
-
-    /* deformVerts */ NULL,
-    /* deformMatrices */ NULL,
-    /* deformVertsEM */ NULL,
-    /* deformMatricesEM */ NULL,
-    /* modifyMesh */ NULL,
-    /* modifyHair */ NULL,
-    /* modifyPointCloud */ modifyPointCloud,
-    /* modifyVolume */ NULL,
-
-    /* initData */ initData,
-    /* requiredDataMask */ NULL,
-    /* freeData */ freeData,
-    /* isDisabled */ isDisabled,
-    /* updateDepsgraph */ updateDepsgraph,
-    /* dependsOnTime */ NULL,
-    /* dependsOnNormals */ NULL,
-    /* foreachIDLink */ foreachIDLink,
-    /* foreachTexLink */ NULL,
-    /* freeRuntimeData */ NULL,
-    /* panelRegister */ panelRegister,
-    /* blendWrite */ blendWrite,
-    /* blendRead */ blendRead,
-};

source/blender/modifiers/intern/MOD_triangulate.c

@@ -48,11 +48,17 @@
 #include "MOD_modifiertypes.h"
 #include "MOD_ui_common.h"
 
-static Mesh *triangulate_mesh(Mesh *mesh,
-                              const int quad_method,
-                              const int ngon_method,
-                              const int min_vertices,
-                              const int flag)
+Mesh *triangulate_mesh(Mesh *mesh,
+                       const int quad_method,
+                       const int ngon_method,
+                       const int min_vertices,
+                       const int flag);
+
+Mesh *triangulate_mesh(Mesh *mesh,
+                       const int quad_method,
+                       const int ngon_method,
+                       const int min_vertices,
+                       const int flag)
 {
   Mesh *result;
   BMesh *bm;

source/blender/modifiers/intern/MOD_util.c

@@ -342,7 +342,7 @@ void modifier_type_init(ModifierTypeInfo *types[])
   INIT_TYPE(MeshSequenceCache);
   INIT_TYPE(SurfaceDeform);
   INIT_TYPE(WeightedNormal);
-  INIT_TYPE(Simulation);
+  INIT_TYPE(Nodes);
   INIT_TYPE(MeshToVolume);
   INIT_TYPE(VolumeDisplace);
   INIT_TYPE(VolumeToMesh);

source/blender/nodes/CMakeLists.txt

@@ -24,7 +24,7 @@ set(INC
   function
   intern
   shader
-  simulation
+  geometry
   texture
   ../blenkernel
   ../blenlib
@@ -137,6 +137,14 @@ set(SRC
   function/nodes/node_fn_switch.cc
   function/node_function_util.cc
 
+  geometry/nodes/node_geo_common.cc
+  geometry/nodes/node_geo_edge_split.cc
+  geometry/nodes/node_geo_transform.cc
+  geometry/nodes/node_geo_triangulate.cc
+  geometry/node_geometry_exec.cc
+  geometry/node_geometry_tree.cc
+  geometry/node_geometry_util.cc
+
   shader/nodes/node_shader_add_shader.c
   shader/nodes/node_shader_ambient_occlusion.c
   shader/nodes/node_shader_attribute.c
@@ -230,10 +238,6 @@ set(SRC
   shader/node_shader_tree.c
   shader/node_shader_util.c
 
-  simulation/nodes/node_sim_common.cc
-  simulation/node_simulation_tree.cc
-  simulation/node_simulation_util.cc
-
   texture/nodes/node_texture_at.c
   texture/nodes/node_texture_bricks.c
   texture/nodes/node_texture_checker.c
@@ -268,11 +272,12 @@ set(SRC
   intern/node_tree_multi_function.cc
   intern/node_tree_ref.cc
   intern/node_util.c
+  intern/type_callbacks.cc
 
   composite/node_composite_util.h
   function/node_function_util.hh
   shader/node_shader_util.h
-  simulation/node_simulation_util.h
+  geometry/node_geometry_util.hh
   texture/node_texture_util.h
 
   NOD_common.h
@@ -283,10 +288,11 @@ set(SRC
   NOD_node_tree_multi_function.hh
   NOD_node_tree_ref.hh
   NOD_shader.h
-  NOD_simulation.h
+  NOD_geometry.h
   NOD_socket.h
   NOD_static_types.h
   NOD_texture.h
+  NOD_type_callbacks.hh
   intern/node_common.h
   intern/node_exec.h
   intern/node_util.h

source/blender/nodes/NOD_derived_node_tree.hh

@@ -65,6 +65,8 @@ class DSocket : NonCopyable, NonMovable {
   PointerRNA *rna() const;
   StringRefNull idname() const;
   StringRefNull name() const;
+  StringRefNull identifier() const;
+  bNodeSocketType *typeinfo() const;
 
   const SocketRef &socket_ref() const;
   bNodeSocket *bsocket() const;
@@ -147,6 +149,8 @@ class DNode : NonCopyable, NonMovable {
   PointerRNA *rna() const;
   StringRefNull idname() const;
   StringRefNull name() const;
+  bNode *bnode() const;
+  bNodeType *typeinfo() const;
 
  private:
   void destruct_with_sockets();
@@ -288,6 +292,16 @@ inline StringRefNull DSocket::name() const
   return socket_ref_->name();
 }
 
+inline StringRefNull DSocket::identifier() const
+{
+  return socket_ref_->identifier();
+}
+
+inline bNodeSocketType *DSocket::typeinfo() const
+{
+  return socket_ref_->bsocket()->typeinfo;
+}
+
 inline const SocketRef &DSocket::socket_ref() const
 {
   return *socket_ref_;
@@ -445,6 +459,16 @@ inline StringRefNull DNode::name() const
   return node_ref_->name();
 }
 
+inline bNode *DNode::bnode() const
+{
+  return node_ref_->bnode();
+}
+
+inline bNodeType *DNode::typeinfo() const
+{
+  return node_ref_->bnode()->typeinfo;
+}
+
 /* --------------------------------------------------------------------
  * DParentNode inline methods.
  */

source/blender/nodes/NOD_geometry.h

@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern struct bNodeTreeType *ntreeType_Geometry;
+
+void register_node_tree_type_geo(void);
+
+void register_node_type_geo_group(void);
+
+void register_node_type_geo_triangulate(void);
+void register_node_type_geo_edge_split(void);
+void register_node_type_geo_transform(void);
+
+#ifdef __cplusplus
+}
+#endif

source/blender/nodes/NOD_geometry_exec.hh

@@ -0,0 +1,92 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include "FN_generic_pointer.hh"
+
+#include "BLI_linear_allocator.hh"
+#include "BLI_map.hh"
+
+#include "BKE_geometry.hh"
+
+namespace blender::nodes {
+
+using bke::Geometry;
+using bke::GeometryPtr;
+using fn::CPPType;
+using fn::GMutablePointer;
+
+/**
+ * This container maps names to values of arbitrary type. It is used to represent the input and
+ * output values of geometry nodes.
+ *
+ * The string keys are only referenced, but the values are owned.
+ */
+class GValueByName {
+ private:
+  /* Used to allocate values owned by this container. */
+  LinearAllocator<> &allocator_;
+  Map<StringRef, GMutablePointer> values_;
+
+ public:
+  GValueByName(LinearAllocator<> &allocator) : allocator_(allocator)
+  {
+  }
+
+  ~GValueByName()
+  {
+    /* Destruct all values that have not been destructed. */
+    for (GMutablePointer value : values_.values()) {
+      value.type()->destruct(value.get());
+    }
+  }
+
+  /* Add a value to the container. */
+  void move_in(StringRef name, GMutablePointer value)
+  {
+    const CPPType &type = *value.type();
+    void *buffer = allocator_.allocate(type.size(), type.alignment());
+    type.move_to_uninitialized(value.get(), buffer);
+    values_.add_new(name, GMutablePointer{type, buffer});
+  }
+
+  /* Add a value to the container. */
+  template<typename T> void move_in(StringRef name, T &&value)
+  {
+    this->move_in(name, GMutablePointer{&value});
+  }
+
+  /* Remove the value for the given name from the container and remove it. The caller is
+   * responsible for freeing it. */
+  GMutablePointer extract(StringRef name)
+  {
+    return values_.pop(name);
+  }
+
+  /* Remove the value for the given name from the container and remove it. */
+  template<typename T> T extract(StringRef name)
+  {
+    GMutablePointer value = values_.pop(name);
+    const CPPType &type = *value.type();
+    BLI_assert(type.is<T>());
+    T return_value;
+    type.relocate_to_initialized(value.get(), &return_value);
+    return return_value;
+  }
+};
+
+}  // namespace blender::nodes

source/blender/nodes/NOD_node_tree_multi_function.hh

@@ -26,21 +26,12 @@
 #include "FN_multi_function_network.hh"
 
 #include "NOD_derived_node_tree.hh"
+#include "NOD_type_callbacks.hh"
 
 #include "BLI_resource_collector.hh"
 
 namespace blender::nodes {
 
-/* Maybe this should be moved to BKE_node.h. */
-inline bool is_multi_function_data_socket(const bNodeSocket *bsocket)
-{
-  if (bsocket->typeinfo->get_mf_data_type != nullptr) {
-    BLI_assert(bsocket->typeinfo->expand_in_mf_network != nullptr);
-    return true;
-  }
-  return false;
-}
-
 /**
  * A MFNetworkTreeMap maps various components of a DerivedNodeTree to components of a
  * fn::MFNetwork. This is necessary for further processing of a multi-function network that has
@@ -149,7 +140,7 @@ class MFNetworkTreeMap {
       if (!dsocket->is_available()) {
         continue;
       }
-      if (!is_multi_function_data_socket(dsocket->bsocket())) {
+      if (!socket_is_mf_data_socket(*dsocket->bsocket()->typeinfo)) {
         continue;
       }
       fn::MFSocket *socket = sockets[used_sockets];
@@ -299,6 +290,11 @@ class SocketMFNetworkBuilder : public MFNetworkBuilderBase {
   {
     this->construct_generator_fn<fn::CustomMF_Constant<T>>(std::move(value));
   }
+  void set_constant_value(const CPPType &type, const void *value)
+  {
+    /* The value has live as long as the generated mf network. */
+    this->construct_generator_fn<fn::CustomMF_GenericConstant>(type, value);
+  }
 
   template<typename T, typename... Args> void construct_generator_fn(Args &&... args)
   {
@@ -397,4 +393,37 @@ MFNetworkTreeMap insert_node_tree_into_mf_network(fn::MFNetwork &network,
                                                   const DerivedNodeTree &tree,
                                                   ResourceCollector &resources);
 
+using MultiFunctionByNode = Map<const DNode *, const fn::MultiFunction *>;
+MultiFunctionByNode get_multi_function_per_node(const DerivedNodeTree &tree,
+                                                ResourceCollector &resources);
+
+class DataTypeConversions {
+ private:
+  Map<std::pair<fn::MFDataType, fn::MFDataType>, const fn::MultiFunction *> conversions_;
+
+ public:
+  void add(fn::MFDataType from_type, fn::MFDataType to_type, const fn::MultiFunction &fn)
+  {
+    conversions_.add_new({from_type, to_type}, &fn);
+  }
+
+  const fn::MultiFunction *get_conversion(fn::MFDataType from, fn::MFDataType to) const
+  {
+    return conversions_.lookup_default({from, to}, nullptr);
+  }
+
+  bool is_convertible(const CPPType &from_type, const CPPType &to_type) const
+  {
+    return conversions_.contains(
+        {fn::MFDataType::ForSingle(from_type), fn::MFDataType::ForSingle(to_type)});
+  }
+
+  void convert(const CPPType &from_type,
+               const CPPType &to_type,
+               const void *from_value,
+               void *to_value) const;
+};
+
+const DataTypeConversions &get_implicit_type_conversions();
+
 }  // namespace blender::nodes

source/blender/nodes/NOD_node_tree_ref.hh

@@ -101,6 +101,7 @@ class SocketRef : NonCopyable, NonMovable {
 
   StringRefNull idname() const;
   StringRefNull name() const;
+  StringRefNull identifier() const;
 
   bNodeSocket *bsocket() const;
   bNode *bnode() const;
@@ -272,6 +273,11 @@ inline StringRefNull SocketRef::name() const
   return bsocket_->name;
 }
 
+inline StringRefNull SocketRef::identifier() const
+{
+  return bsocket_->identifier;
+}
+
 inline bNodeSocket *SocketRef::bsocket() const
 {
   return bsocket_;

source/blender/nodes/NOD_static_types.h

@@ -266,6 +266,10 @@ DefNode(FunctionNode, FN_NODE_COMBINE_STRINGS, 0,               "COMBINE_STRINGS
 DefNode(FunctionNode, FN_NODE_OBJECT_TRANSFORMS, 0,             "OBJECT_TRANSFORMS", ObjectTransforms, "Object Transforms", "")
 DefNode(FunctionNode, FN_NODE_RANDOM_FLOAT, 0,                  "RANDOM_FLOAT", RandomFloat, "Random Float", "")
 
+DefNode(GeometryNode, GEO_NODE_TRIANGULATE, 0, "TRIANGULATE", Triangulate, "Triangulate", "")
+DefNode(GeometryNode, GEO_NODE_EDGE_SPLIT, 0, "EDGE_SPLIT", EdgeSplit, "Edge Split", "")
+DefNode(GeometryNode, GEO_NODE_TRANSFORM, 0, "TRANSFORM", Transform, "Transform", "")
+
 
 /* undefine macros */
 #undef DefNode

source/blender/nodes/NOD_type_callbacks.hh

@@ -0,0 +1,36 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <optional>
+
+#include "BKE_node.h"
+
+#include "FN_multi_function_data_type.hh"
+
+namespace blender::nodes {
+
+using fn::CPPType;
+using fn::MFDataType;
+
+const CPPType *socket_cpp_type_get(const bNodeSocketType &stype);
+std::optional<MFDataType> socket_mf_type_get(const bNodeSocketType &stype);
+bool socket_is_mf_data_socket(const bNodeSocketType &stype);
+bool socket_cpp_value_get(const bNodeSocket &socket, void *r_value);
+void socket_expand_in_mf_network(SocketMFNetworkBuilder &builder);
+
+}  // namespace blender::nodes

source/blender/nodes/function/node_function_util.cc

@@ -20,7 +20,7 @@
 bool fn_node_poll_default(bNodeType *UNUSED(ntype), bNodeTree *ntree)
 {
   /* Function nodes are only supported in simulation node trees so far. */
-  return STREQ(ntree->idname, "SimulationNodeTree");
+  return STREQ(ntree->idname, "GeometryNodeTree");
 }
 
 void fn_node_type_base(bNodeType *ntype, int type, const char *name, short nclass, short flag)

source/blender/nodes/function/nodes/node_fn_random_float.cc

@@ -21,7 +21,7 @@
 static bNodeSocketTemplate fn_node_random_float_in[] = {
     {SOCK_FLOAT, N_("Min"), 0.0f, 0.0f, 0.0f, 0.0f, -10000.0f, 10000.0f, PROP_NONE},
     {SOCK_FLOAT, N_("Max"), 1.0f, 0.0f, 0.0f, 0.0f, -10000.0f, 10000.0f, PROP_NONE},
-    {SOCK_INT, N_("Seed")},
+    {SOCK_INT, N_("Seed"), 0, 0, 0, 0, -10000, 10000},
     {-1, ""},
 };
 

source/blender/nodes/geometry/node_geometry_exec.cc

@@ -14,18 +14,10 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
-#pragma once
+#include "NOD_geometry_exec.hh"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+MAKE_CPP_TYPE(GeometryPtr, blender::bke::GeometryPtr);
 
-extern struct bNodeTreeType *ntreeType_Simulation;
+namespace blender::nodes {
 
-void register_node_tree_type_sim(void);
-
-void register_node_type_sim_group(void);
-
-#ifdef __cplusplus
 }
-#endif

source/blender/nodes/geometry/node_geometry_tree.cc

@@ -18,7 +18,7 @@
 
 #include "MEM_guardedalloc.h"
 
-#include "NOD_simulation.h"
+#include "NOD_geometry.h"
 
 #include "BKE_node.h"
 
@@ -28,18 +28,18 @@
 
 #include "RNA_access.h"
 
-bNodeTreeType *ntreeType_Simulation;
+bNodeTreeType *ntreeType_Geometry;
 
-void register_node_tree_type_sim(void)
+void register_node_tree_type_geo(void)
 {
-  bNodeTreeType *tt = ntreeType_Simulation = static_cast<bNodeTreeType *>(
-      MEM_callocN(sizeof(bNodeTreeType), "simulation node tree type"));
-  tt->type = NTREE_SIMULATION;
-  strcpy(tt->idname, "SimulationNodeTree");
-  strcpy(tt->ui_name, N_("Simulation Editor"));
+  bNodeTreeType *tt = ntreeType_Geometry = static_cast<bNodeTreeType *>(
+      MEM_callocN(sizeof(bNodeTreeType), "geometry node tree type"));
+  tt->type = NTREE_GEOMETRY;
+  strcpy(tt->idname, "GeometryNodeTree");
+  strcpy(tt->ui_name, N_("Geometry Node Editor"));
   tt->ui_icon = 0; /* defined in drawnode.c */
-  strcpy(tt->ui_description, N_("Simulation nodes"));
-  tt->rna_ext.srna = &RNA_SimulationNodeTree;
+  strcpy(tt->ui_description, N_("Geometry nodes"));
+  tt->rna_ext.srna = &RNA_GeometryNodeTree;
 
   ntreeTypeAdd(tt);
 }

source/blender/nodes/geometry/node_geometry_util.cc

@@ -14,16 +14,16 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
-#include "node_simulation_util.h"
+#include "node_geometry_util.hh"
 #include "node_util.h"
 
-bool sim_node_poll_default(bNodeType *UNUSED(ntype), bNodeTree *ntree)
+bool geo_node_poll_default(bNodeType *UNUSED(ntype), bNodeTree *ntree)
 {
-  return STREQ(ntree->idname, "SimulationNodeTree");
+  return STREQ(ntree->idname, "GeometryNodeTree");
 }
 
-void sim_node_type_base(bNodeType *ntype, int type, const char *name, short nclass, short flag)
+void geo_node_type_base(bNodeType *ntype, int type, const char *name, short nclass, short flag)
 {
   node_type_base(ntype, type, name, nclass, flag);
-  ntype->poll = sim_node_poll_default;
+  ntype->poll = geo_node_poll_default;
 }

source/blender/nodes/geometry/node_geometry_util.hh

@@ -18,6 +18,7 @@
 
 #include <string.h>
 
+#include "BLI_float3.hh"
 #include "BLI_utildefines.h"
 
 #include "MEM_guardedalloc.h"
@@ -28,10 +29,11 @@
 
 #include "BLT_translation.h"
 
-#include "NOD_simulation.h"
+#include "NOD_geometry.h"
+#include "NOD_geometry_exec.hh"
 
 #include "node_util.h"
 
-void sim_node_type_base(
+void geo_node_type_base(
     struct bNodeType *ntype, int type, const char *name, short nclass, short flag);
-bool sim_node_poll_default(struct bNodeType *ntype, struct bNodeTree *ntree);
+bool geo_node_poll_default(struct bNodeType *ntype, struct bNodeTree *ntree);

source/blender/nodes/geometry/nodes/node_geo_common.cc

@@ -16,23 +16,23 @@
 
 #include "BKE_node.h"
 
-#include "NOD_simulation.h"
+#include "NOD_geometry.h"
 
 #include "NOD_common.h"
 #include "node_common.h"
-#include "node_simulation_util.h"
+#include "node_geometry_util.hh"
 
-void register_node_type_sim_group(void)
+void register_node_type_geo_group(void)
 {
   static bNodeType ntype;
 
-  node_type_base_custom(&ntype, "SimulationNodeGroup", "Group", 0, 0);
+  node_type_base_custom(&ntype, "GeometryNodeGroup", "Group", 0, 0);
   ntype.type = NODE_GROUP;
-  ntype.poll = sim_node_poll_default;
+  ntype.poll = geo_node_poll_default;
   ntype.poll_instance = node_group_poll_instance;
   ntype.insert_link = node_insert_link_default;
   ntype.update_internal_links = node_update_internal_links_default;
-  ntype.rna_ext.srna = RNA_struct_find("SimulationNodeGroup");
+  ntype.rna_ext.srna = RNA_struct_find("GeometryNodeGroup");
   BLI_assert(ntype.rna_ext.srna != NULL);
   RNA_struct_blender_type_set(ntype.rna_ext.srna, &ntype);
 

source/blender/nodes/geometry/nodes/node_geo_edge_split.cc

@@ -0,0 +1,83 @@
+/*
+ * 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.
+ */
+
+#include "BLI_math_base.h"
+#include "BLI_math_rotation.h"
+
+#include "DNA_modifier_types.h"
+
+#include "node_geometry_util.hh"
+
+extern "C" {
+Mesh *doEdgeSplit(Mesh *mesh, EdgeSplitModifierData *emd);
+}
+
+static bNodeSocketTemplate geo_node_edge_split_in[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {SOCK_FLOAT,
+     N_("Angle"),
+     DEG2RADF(30.0f),
+     0.0f,
+     0.0f,
+     0.0f,
+     0.0f,
+     DEG2RADF(180.0f),
+     PROP_ANGLE},
+    {SOCK_BOOLEAN, N_("Sharp Edges")},
+    {-1, ""},
+};
+
+static bNodeSocketTemplate geo_node_edge_split_out[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {-1, ""},
+};
+
+namespace blender::nodes {
+static void geo_edge_split_exec(bNode *UNUSED(node), GValueByName &inputs, GValueByName &outputs)
+{
+  GeometryPtr geometry_in = inputs.extract<GeometryPtr>("Geometry");
+
+  GeometryPtr geometry_out;
+  if (geometry_in.has_value()) {
+    Mesh *mesh_in = geometry_in->mesh_get_for_read();
+    if (mesh_in != nullptr) {
+      const float split_angle = inputs.extract<float>("Angle");
+      const bool use_sharp_flag = inputs.extract<bool>("Sharp Edges");
+
+      /* Use modifier struct to pass arguments to the modifier code. */
+      EdgeSplitModifierData emd = {.split_angle = split_angle, .flags = MOD_EDGESPLIT_FROMANGLE};
+      if (use_sharp_flag) {
+        emd.flags |= MOD_EDGESPLIT_FROMFLAG;
+      }
+
+      Mesh *mesh_out = doEdgeSplit(mesh_in, &emd);
+      geometry_out = GeometryPtr{new Geometry()};
+      geometry_out->mesh_set_and_transfer_ownership(mesh_out);
+    }
+  }
+  outputs.move_in("Geometry", std::move(geometry_out));
+}
+}  // namespace blender::nodes
+
+void register_node_type_geo_edge_split()
+{
+  static bNodeType ntype;
+
+  geo_node_type_base(&ntype, GEO_NODE_EDGE_SPLIT, "Edge Split", 0, 0);
+  node_type_socket_templates(&ntype, geo_node_edge_split_in, geo_node_edge_split_out);
+  ntype.geometry_node_execute = blender::nodes::geo_edge_split_exec;
+  nodeRegisterType(&ntype);
+}

source/blender/nodes/geometry/nodes/node_geo_transform.cc

@@ -0,0 +1,83 @@
+/*
+ * 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.
+ */
+
+#include "BKE_mesh.h"
+#include "BLI_math_matrix.h"
+
+#include "node_geometry_util.hh"
+
+static bNodeSocketTemplate geo_node_transform_in[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {SOCK_VECTOR, N_("Translation"), 0.0f, 0.0f, 0.0f, 1.0f, -FLT_MAX, FLT_MAX, PROP_TRANSLATION},
+    {SOCK_VECTOR, N_("Rotation"), 0.0f, 0.0f, 0.0f, 1.0f, -FLT_MAX, FLT_MAX, PROP_EULER},
+    {SOCK_VECTOR, N_("Scale"), 1.0f, 1.0f, 1.0f, 1.0f, -FLT_MAX, FLT_MAX, PROP_XYZ},
+    {-1, ""},
+};
+
+static bNodeSocketTemplate geo_node_transform_out[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {-1, ""},
+};
+
+namespace blender::nodes {
+static void geo_transform_exec(bNode *UNUSED(node), GValueByName &inputs, GValueByName &outputs)
+{
+  GeometryPtr geometry_in = inputs.extract<GeometryPtr>("Geometry");
+  GeometryPtr geometry_out;
+
+  if (!geometry_in.has_value()) {
+    outputs.move_in("Geometry", std::move(geometry_out));
+    return;
+  }
+
+  Mesh *mesh_in = geometry_in->mesh_get_for_read();
+  if (mesh_in == nullptr) {
+    outputs.move_in("Geometry", std::move(geometry_out));
+    return;
+  }
+
+  const float3 translation = inputs.extract<float3>("Translation");
+  const float3 rotation = inputs.extract<float3>("Rotation");
+  const float3 scale = inputs.extract<float3>("Scale");
+
+  geometry_out = GeometryPtr{new Geometry()};
+  Mesh *mesh_out = BKE_mesh_copy_for_eval(mesh_in, false);
+
+  /* Use only translation if rotation and scale are zero. */
+  if (translation.length() > 0.0f && rotation.length() == 0.0f && scale.length() == 0.0f) {
+    BKE_mesh_translate(mesh_out, translation, true);
+  }
+  else {
+    float mat[4][4];
+    loc_eul_size_to_mat4(mat, translation, rotation, scale);
+    BKE_mesh_transform(mesh_out, mat, true);
+  }
+
+  geometry_out->mesh_set_and_transfer_ownership(mesh_out);
+
+  outputs.move_in("Geometry", std::move(geometry_out));
+}
+}  // namespace blender::nodes
+
+void register_node_type_geo_transform()
+{
+  static bNodeType ntype;
+
+  geo_node_type_base(&ntype, GEO_NODE_TRANSFORM, "Transform", 0, 0);
+  node_type_socket_templates(&ntype, geo_node_transform_in, geo_node_transform_out);
+  ntype.geometry_node_execute = blender::nodes::geo_transform_exec;
+  nodeRegisterType(&ntype);
+}

source/blender/nodes/geometry/nodes/node_geo_triangulate.cc

@@ -0,0 +1,64 @@
+/*
+ * 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.
+ */
+
+#include "node_geometry_util.hh"
+
+extern "C" {
+Mesh *triangulate_mesh(Mesh *mesh,
+                       const int quad_method,
+                       const int ngon_method,
+                       const int min_vertices,
+                       const int flag);
+}
+
+static bNodeSocketTemplate geo_node_triangulate_in[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {SOCK_INT, N_("Minimum Vertices"), 4, 0, 0, 0, 4, 10000},
+    {-1, ""},
+};
+
+static bNodeSocketTemplate geo_node_triangulate_out[] = {
+    {SOCK_GEOMETRY, N_("Geometry")},
+    {-1, ""},
+};
+
+namespace blender::nodes {
+static void geo_triangulate_exec(bNode *UNUSED(node), GValueByName &inputs, GValueByName &outputs)
+{
+  GeometryPtr geometry_in = inputs.extract<GeometryPtr>("Geometry");
+  const int min_vertices = std::max(inputs.extract<int>("Minimum Vertices"), 4);
+  GeometryPtr geometry_out;
+  if (geometry_in.has_value()) {
+    Mesh *mesh_in = geometry_in->mesh_get_for_read();
+    if (mesh_in != nullptr) {
+      Mesh *mesh_out = triangulate_mesh(mesh_in, 3, 0, min_vertices, 0);
+      geometry_out = GeometryPtr{new Geometry()};
+      geometry_out->mesh_set_and_transfer_ownership(mesh_out);
+    }
+  }
+  outputs.move_in("Geometry", std::move(geometry_out));
+}
+}  // namespace blender::nodes
+
+void register_node_type_geo_triangulate()
+{
+  static bNodeType ntype;
+
+  geo_node_type_base(&ntype, GEO_NODE_TRIANGULATE, "Triangulate", 0, 0);
+  node_type_socket_templates(&ntype, geo_node_triangulate_in, geo_node_triangulate_out);
+  ntype.geometry_node_execute = blender::nodes::geo_triangulate_exec;
+  nodeRegisterType(&ntype);
+}

source/blender/nodes/intern/node_socket.cc

@@ -32,6 +32,7 @@
 #include "BLI_string.h"
 #include "BLI_utildefines.h"
 
+#include "BKE_geometry.hh"
 #include "BKE_lib_id.h"
 #include "BKE_node.h"
 #include "BKE_persistent_data_handle.hh"
@@ -552,10 +553,9 @@ static bNodeSocketType *make_socket_type_virtual(void)
 static bNodeSocketType *make_socket_type_bool()
 {
   bNodeSocketType *socktype = make_standard_socket_type(SOCK_BOOLEAN, PROP_NONE);
-  socktype->get_mf_data_type = []() { return blender::fn::MFDataType::ForSingle<bool>(); };
-  socktype->expand_in_mf_network = [](blender::nodes::SocketMFNetworkBuilder &builder) {
-    bool value = builder.socket_default_value<bNodeSocketValueBoolean>()->value;
-    builder.set_constant_value(value);
+  socktype->get_cpp_type = []() { return &blender::fn::CPPType::get<bool>(); };
+  socktype->get_cpp_value = [](const bNodeSocket &socket, void *r_value) {
+    *(bool *)r_value = ((bNodeSocketValueBoolean *)socket.default_value)->value;
   };
   return socktype;
 }
@@ -563,10 +563,9 @@ static bNodeSocketType *make_socket_type_bool()
 static bNodeSocketType *make_socket_type_float(PropertySubType subtype)
 {
   bNodeSocketType *socktype = make_standard_socket_type(SOCK_FLOAT, subtype);
-  socktype->get_mf_data_type = []() { return blender::fn::MFDataType::ForSingle<float>(); };
-  socktype->expand_in_mf_network = [](blender::nodes::SocketMFNetworkBuilder &builder) {
-    float value = builder.socket_default_value<bNodeSocketValueFloat>()->value;
-    builder.set_constant_value(value);
+  socktype->get_cpp_type = []() { return &blender::fn::CPPType::get<float>(); };
+  socktype->get_cpp_value = [](const bNodeSocket &socket, void *r_value) {
+    *(float *)r_value = ((bNodeSocketValueFloat *)socket.default_value)->value;
   };
   return socktype;
 }
@@ -574,10 +573,9 @@ static bNodeSocketType *make_socket_type_float(PropertySubType subtype)
 static bNodeSocketType *make_socket_type_int(PropertySubType subtype)
 {
   bNodeSocketType *socktype = make_standard_socket_type(SOCK_INT, subtype);
-  socktype->get_mf_data_type = []() { return blender::fn::MFDataType::ForSingle<int>(); };
-  socktype->expand_in_mf_network = [](blender::nodes::SocketMFNetworkBuilder &builder) {
-    int value = builder.socket_default_value<bNodeSocketValueInt>()->value;
-    builder.set_constant_value(value);
+  socktype->get_cpp_type = []() { return &blender::fn::CPPType::get<int>(); };
+  socktype->get_cpp_value = [](const bNodeSocket &socket, void *r_value) {
+    *(int *)r_value = ((bNodeSocketValueInt *)socket.default_value)->value;
   };
   return socktype;
 }
@@ -585,12 +583,9 @@ static bNodeSocketType *make_socket_type_int(PropertySubType subtype)
 static bNodeSocketType *make_socket_type_vector(PropertySubType subtype)
 {
   bNodeSocketType *socktype = make_standard_socket_type(SOCK_VECTOR, subtype);
-  socktype->get_mf_data_type = []() {
-    return blender::fn::MFDataType::ForSingle<blender::float3>();
-  };
-  socktype->expand_in_mf_network = [](blender::nodes::SocketMFNetworkBuilder &builder) {
-    blender::float3 value = builder.socket_default_value<bNodeSocketValueVector>()->value;
-    builder.set_constant_value(value);
+  socktype->get_cpp_type = []() { return &blender::fn::CPPType::get<blender::float3>(); };
+  socktype->get_cpp_value = [](const bNodeSocket &socket, void *r_value) {
+    *(blender::float3 *)r_value = ((bNodeSocketValueVector *)socket.default_value)->value;
   };
   return socktype;
 }
@@ -598,12 +593,9 @@ static bNodeSocketType *make_socket_type_vector(PropertySubType subtype)
 static bNodeSocketType *make_socket_type_rgba()
 {
   bNodeSocketType *socktype = make_standard_socket_type(SOCK_RGBA, PROP_NONE);
-  socktype->get_mf_data_type = []() {
-    return blender::fn::MFDataType::ForSingle<blender::Color4f>();
-  };
-  socktype->expand_in_mf_network = [](blender::nodes::SocketMFNetworkBuilder &builder) {
-    blender::Color4f value = builder.socket_default_value<bNodeSocketValueRGBA>()->value;
-    builder.set_constant_value(value);
+  socktype->get_cpp_type = []() { return &blender::fn::CPPType::get<blender::Color4f>(); };
+  socktype->get_cpp_value = [](const bNodeSocket &socket, void *r_value) {
+    *(blender::Color4f *)r_value = ((bNodeSocketValueRGBA *)socket.default_value)->value;
   };
   return socktype;
 }
@@ -611,10 +603,9 @@ static bNodeSocketType *make_socket_type_rgba()
 static bNodeSocketType *make_socket_type_string()
 {
   bNodeSocketType *socktype = make_standard_socket_type(SOCK_STRING, PROP_NONE);
-  socktype->get_mf_data_type = []() { return blender::fn::MFDataType::ForSingle<std::string>(); };
-  socktype->expand_in_mf_network = [](blender::nodes::SocketMFNetworkBuilder &builder) {
-    std::string value = builder.socket_default_value<bNodeSocketValueString>()->value;
-    builder.set_constant_value(value);
+  socktype->get_cpp_type = []() { return &blender::fn::CPPType::get<std::string>(); };
+  socktype->get_cpp_value = [](const bNodeSocket &socket, void *r_value) {
+    new (r_value) std::string(((bNodeSocketValueString *)socket.default_value)->value);
   };
   return socktype;
 }
@@ -661,9 +652,9 @@ MAKE_CPP_TYPE(PersistentObjectHandle, blender::bke::PersistentObjectHandle);
 static bNodeSocketType *make_socket_type_object()
 {
   bNodeSocketType *socktype = make_standard_socket_type(SOCK_OBJECT, PROP_NONE);
-  socktype->get_mf_data_type = []() {
+  socktype->get_cpp_type = []() {
     /* Objects are not passed along as raw pointers, but as handles. */
-    return blender::fn::MFDataType::ForSingle<blender::bke::PersistentObjectHandle>();
+    return &blender::fn::CPPType::get<blender::bke::PersistentObjectHandle>();
   };
   socktype->expand_in_mf_network = [](blender::nodes::SocketMFNetworkBuilder &builder) {
     Object *object = builder.socket_default_value<bNodeSocketValueObject>()->value;
@@ -672,6 +663,18 @@ static bNodeSocketType *make_socket_type_object()
   return socktype;
 }
 
+static bNodeSocketType *make_socket_type_geometry()
+{
+  bNodeSocketType *socktype = make_standard_socket_type(SOCK_GEOMETRY, PROP_NONE);
+  socktype->get_cpp_type = []() {
+    return &blender::fn::CPPType::get<blender::bke::GeometryPtr>();
+  };
+  socktype->get_cpp_value = [](const bNodeSocket &UNUSED(socket), void *r_value) {
+    new (r_value) blender::bke::GeometryPtr();
+  };
+  return socktype;
+}
+
 void register_standard_node_socket_types(void)
 {
   /* draw callbacks are set in drawnode.c to avoid bad-level calls */
@@ -708,5 +711,7 @@ void register_standard_node_socket_types(void)
 
   nodeRegisterSocketType(make_standard_socket_type(SOCK_IMAGE, PROP_NONE));
 
+  nodeRegisterSocketType(make_socket_type_geometry());
+
   nodeRegisterSocketType(make_socket_type_virtual());
 }

source/blender/nodes/intern/node_tree_multi_function.cc

@@ -16,21 +16,13 @@
 
 #include "NOD_node_tree_multi_function.hh"
 
+#include "FN_multi_function_network_evaluation.hh"
+
 #include "BLI_color.hh"
 #include "BLI_float3.hh"
 
 namespace blender::nodes {
 
-/* Maybe this should be moved to BKE_node.h. */
-static std::optional<fn::MFDataType> try_get_multi_function_data_type_of_socket(
-    const bNodeSocket *bsocket)
-{
-  if (bsocket->typeinfo->get_mf_data_type == nullptr) {
-    return {};
-  }
-  return bsocket->typeinfo->get_mf_data_type();
-}
-
 const fn::MultiFunction &NodeMFNetworkBuilder::get_default_fn(StringRef name)
 {
   Vector<fn::MFDataType, 10> input_types;
@@ -38,8 +30,7 @@ const fn::MultiFunction &NodeMFNetworkBuilder::get_default_fn(StringRef name)
 
   for (const DInputSocket *dsocket : dnode_.inputs()) {
     if (dsocket->is_available()) {
-      std::optional<fn::MFDataType> data_type = try_get_multi_function_data_type_of_socket(
-          dsocket->bsocket());
+      std::optional<fn::MFDataType> data_type = socket_mf_type_get(*dsocket->bsocket()->typeinfo);
       if (data_type.has_value()) {
         input_types.append(*data_type);
       }
@@ -47,8 +38,7 @@ const fn::MultiFunction &NodeMFNetworkBuilder::get_default_fn(StringRef name)
   }
   for (const DOutputSocket *dsocket : dnode_.outputs()) {
     if (dsocket->is_available()) {
-      std::optional<fn::MFDataType> data_type = try_get_multi_function_data_type_of_socket(
-          dsocket->bsocket());
+      std::optional<fn::MFDataType> data_type = socket_mf_type_get(*dsocket->bsocket()->typeinfo);
       if (data_type.has_value()) {
         output_types.append(*data_type);
       }
@@ -70,8 +60,7 @@ static void insert_dummy_node(CommonMFNetworkBuilderData &common, const DNode &d
 
   for (const DInputSocket *dsocket : dnode.inputs()) {
     if (dsocket->is_available()) {
-      std::optional<fn::MFDataType> data_type = try_get_multi_function_data_type_of_socket(
-          dsocket->bsocket());
+      std::optional<fn::MFDataType> data_type = socket_mf_type_get(*dsocket->bsocket()->typeinfo);
       if (data_type.has_value()) {
         input_types.append(*data_type);
         input_names.append(dsocket->name());
@@ -86,8 +75,7 @@ static void insert_dummy_node(CommonMFNetworkBuilderData &common, const DNode &d
 
   for (const DOutputSocket *dsocket : dnode.outputs()) {
     if (dsocket->is_available()) {
-      std::optional<fn::MFDataType> data_type = try_get_multi_function_data_type_of_socket(
-          dsocket->bsocket());
+      std::optional<fn::MFDataType> data_type = socket_mf_type_get(*dsocket->bsocket()->typeinfo);
       if (data_type.has_value()) {
         output_types.append(*data_type);
         output_names.append(dsocket->name());
@@ -106,12 +94,12 @@ static void insert_dummy_node(CommonMFNetworkBuilderData &common, const DNode &d
 static bool has_data_sockets(const DNode &dnode)
 {
   for (const DInputSocket *socket : dnode.inputs()) {
-    if (is_multi_function_data_socket(socket->bsocket())) {
+    if (socket_is_mf_data_socket(*socket->bsocket()->typeinfo)) {
       return true;
     }
   }
   for (const DOutputSocket *socket : dnode.outputs()) {
-    if (is_multi_function_data_socket(socket->bsocket())) {
+    if (socket_is_mf_data_socket(*socket->bsocket()->typeinfo)) {
       return true;
     }
   }
@@ -140,7 +128,7 @@ static void insert_group_inputs(CommonMFNetworkBuilderData &common)
 {
   for (const DGroupInput *group_input : common.tree.group_inputs()) {
     bNodeSocket *bsocket = group_input->bsocket();
-    if (is_multi_function_data_socket(bsocket)) {
+    if (socket_is_mf_data_socket(*bsocket->typeinfo)) {
       bNodeSocketType *socktype = bsocket->typeinfo;
       BLI_assert(socktype->expand_in_mf_network != nullptr);
 
@@ -171,44 +159,43 @@ static fn::MFOutputSocket *try_find_origin(CommonMFNetworkBuilderData &common,
     if (!from_dsocket.is_available()) {
       return nullptr;
     }
-    if (is_multi_function_data_socket(from_dsocket.bsocket())) {
+    if (socket_is_mf_data_socket(*from_dsocket.bsocket()->typeinfo)) {
       return &common.network_map.lookup(from_dsocket);
     }
     return nullptr;
   }
 
   const DGroupInput &from_group_input = *from_group_inputs[0];
-  if (is_multi_function_data_socket(from_group_input.bsocket())) {
+  if (socket_is_mf_data_socket(*from_group_input.bsocket()->typeinfo)) {
     return &common.network_map.lookup(from_group_input);
   }
   return nullptr;
 }
 
-using ImplicitConversionsMap =
-    Map<std::pair<fn::MFDataType, fn::MFDataType>, const fn::MultiFunction *>;
-
 template<typename From, typename To>
-static void add_implicit_conversion(ImplicitConversionsMap &map)
+static void add_implicit_conversion(DataTypeConversions &conversions)
 {
   static fn::CustomMF_Convert<From, To> function;
-  map.add({fn::MFDataType::ForSingle<From>(), fn::MFDataType::ForSingle<To>()}, &function);
+  conversions.add(fn::MFDataType::ForSingle<From>(), fn::MFDataType::ForSingle<To>(), function);
 }
 
 template<typename From, typename To, typename ConversionF>
-static void add_implicit_conversion(ImplicitConversionsMap &map,
+static void add_implicit_conversion(DataTypeConversions &conversions,
                                     StringRef name,
                                     ConversionF conversion)
 {
   static fn::CustomMF_SI_SO<From, To> function{name, conversion};
-  map.add({fn::MFDataType::ForSingle<From>(), fn::MFDataType::ForSingle<To>()}, &function);
+  conversions.add(fn::MFDataType::ForSingle<From>(), fn::MFDataType::ForSingle<To>(), function);
 }
 
-static ImplicitConversionsMap get_implicit_conversions()
+static DataTypeConversions create_implicit_conversions()
 {
-  ImplicitConversionsMap conversions;
+  DataTypeConversions conversions;
   add_implicit_conversion<float, int32_t>(conversions);
   add_implicit_conversion<float, float3>(conversions);
   add_implicit_conversion<int32_t, float>(conversions);
+  add_implicit_conversion<float, bool>(conversions);
+  add_implicit_conversion<bool, float>(conversions);
   add_implicit_conversion<float3, float>(
       conversions, "Vector Length", [](float3 a) { return a.length(); });
   add_implicit_conversion<int32_t, float3>(
@@ -220,11 +207,26 @@ static ImplicitConversionsMap get_implicit_conversions()
   return conversions;
 }
 
-static const fn::MultiFunction *try_get_conversion_function(fn::MFDataType from, fn::MFDataType to)
+const DataTypeConversions &get_implicit_type_conversions()
 {
-  static const ImplicitConversionsMap conversions = get_implicit_conversions();
-  const fn::MultiFunction *function = conversions.lookup_default({from, to}, nullptr);
-  return function;
+  static const DataTypeConversions conversions = create_implicit_conversions();
+  return conversions;
+}
+
+void DataTypeConversions::convert(const CPPType &from_type,
+                                  const CPPType &to_type,
+                                  const void *from_value,
+                                  void *to_value) const
+{
+  const fn::MultiFunction *fn = this->get_conversion(MFDataType::ForSingle(from_type),
+                                                     MFDataType::ForSingle(to_type));
+  BLI_assert(fn != nullptr);
+
+  fn::MFContextBuilder context;
+  fn::MFParamsBuilder params{*fn, 1};
+  params.add_readonly_single_input(fn::GSpan(from_type, from_value, 1));
+  params.add_uninitialized_single_output(fn::GMutableSpan(to_type, to_value, 1));
+  fn->call({0}, params, context);
 }
 
 static fn::MFOutputSocket &insert_default_value_for_type(CommonMFNetworkBuilderData &common,
@@ -253,7 +255,7 @@ static void insert_links(CommonMFNetworkBuilderData &common)
     if (!to_dsocket->is_linked()) {
       continue;
     }
-    if (!is_multi_function_data_socket(to_dsocket->bsocket())) {
+    if (!socket_is_mf_data_socket(*to_dsocket->bsocket()->typeinfo)) {
       continue;
     }
 
@@ -269,7 +271,8 @@ static void insert_links(CommonMFNetworkBuilderData &common)
     fn::MFDataType from_type = from_socket->data_type();
 
     if (from_type != to_type) {
-      const fn::MultiFunction *conversion_fn = try_get_conversion_function(from_type, to_type);
+      const fn::MultiFunction *conversion_fn = get_implicit_type_conversions().get_conversion(
+          from_type, to_type);
       if (conversion_fn != nullptr) {
         fn::MFNode &node = common.network.add_function(*conversion_fn);
         common.network.add_link(*from_socket, node.input(0));
@@ -308,7 +311,7 @@ static void insert_unlinked_inputs(CommonMFNetworkBuilderData &common)
   Vector<const DInputSocket *> unlinked_data_inputs;
   for (const DInputSocket *dsocket : common.tree.input_sockets()) {
     if (dsocket->is_available()) {
-      if (is_multi_function_data_socket(dsocket->bsocket())) {
+      if (socket_is_mf_data_socket(*dsocket->bsocket()->typeinfo)) {
         if (!dsocket->is_linked()) {
           insert_unlinked_input(common, *dsocket);
         }
@@ -340,4 +343,150 @@ MFNetworkTreeMap insert_node_tree_into_mf_network(fn::MFNetwork &network,
   return network_map;
 }
 
+/**
+ * A single node is allowed to expand into multiple nodes before evaluation. Depending on what
+ * nodes it expands to, it belongs a different type of the ones below.
+ */
+enum class NodeExpandType {
+  SingleFunctionNode,
+  MultipleFunctionNodes,
+  HasDummyNodes,
+};
+
+/**
+ * Checks how the given node expanded in the multi-function network. If it is only a single
+ * function node, the corresponding function is returned as well.
+ */
+static NodeExpandType get_node_expand_type(MFNetworkTreeMap &network_map,
+                                           const DNode &dnode,
+                                           const fn::MultiFunction **r_single_function)
+{
+  const fn::MFFunctionNode *single_function_node = nullptr;
+  bool has_multiple_nodes = false;
+  bool has_dummy_nodes = false;
+
+  auto check_mf_node = [&](fn::MFNode &mf_node) {
+    if (mf_node.is_function()) {
+      if (single_function_node == nullptr) {
+        single_function_node = &mf_node.as_function();
+      }
+      if (&mf_node != single_function_node) {
+        has_multiple_nodes = true;
+      }
+    }
+    else {
+      BLI_assert(mf_node.is_dummy());
+      has_dummy_nodes = true;
+    }
+  };
+
+  for (const DInputSocket *dsocket : dnode.inputs()) {
+    if (dsocket->is_available()) {
+      for (fn::MFInputSocket *mf_input : network_map.lookup(*dsocket)) {
+        check_mf_node(mf_input->node());
+      }
+    }
+  }
+  for (const DOutputSocket *dsocket : dnode.outputs()) {
+    if (dsocket->is_available()) {
+      fn::MFOutputSocket &mf_output = network_map.lookup(*dsocket);
+      check_mf_node(mf_output.node());
+    }
+  }
+
+  if (has_dummy_nodes) {
+    return NodeExpandType::HasDummyNodes;
+  }
+  if (has_multiple_nodes) {
+    return NodeExpandType::MultipleFunctionNodes;
+  }
+  *r_single_function = &single_function_node->function();
+  return NodeExpandType::SingleFunctionNode;
+}
+
+static const fn::MultiFunction &create_function_for_node_that_expands_into_multiple(
+    const DNode &dnode,
+    fn::MFNetwork &network,
+    MFNetworkTreeMap &network_map,
+    ResourceCollector &resources)
+{
+  Vector<const fn::MFOutputSocket *> dummy_fn_inputs;
+  for (const DInputSocket *dsocket : dnode.inputs()) {
+    if (dsocket->is_available()) {
+      MFDataType data_type = *socket_mf_type_get(*dsocket->typeinfo());
+      fn::MFOutputSocket &fn_input = network.add_input(data_type.to_string(), data_type);
+      for (fn::MFInputSocket *mf_input : network_map.lookup(*dsocket)) {
+        network.add_link(fn_input, *mf_input);
+        dummy_fn_inputs.append(&fn_input);
+      }
+    }
+  }
+  Vector<const fn::MFInputSocket *> dummy_fn_outputs;
+  for (const DOutputSocket *dsocket : dnode.outputs()) {
+    if (dsocket->is_available()) {
+      fn::MFOutputSocket &mf_output = network_map.lookup(*dsocket);
+      MFDataType data_type = mf_output.data_type();
+      fn::MFInputSocket &fn_output = network.add_output(data_type.to_string(), data_type);
+      network.add_link(mf_output, fn_output);
+      dummy_fn_outputs.append(&fn_output);
+    }
+  }
+
+  fn::MFNetworkEvaluator &fn_evaluator = resources.construct<fn::MFNetworkEvaluator>(
+      __func__, std::move(dummy_fn_inputs), std::move(dummy_fn_outputs));
+  return fn_evaluator;
+}
+
+/**
+ * Returns a single multi-function for every node that supports it. This makes it easier to reuse
+ * the multi-function implementation of nodes in different contexts.
+ */
+MultiFunctionByNode get_multi_function_per_node(const DerivedNodeTree &tree,
+                                                ResourceCollector &resources)
+{
+  /* Build a network that nodes can insert themselves into. However, the individual nodes are not
+   * connected. */
+  fn::MFNetwork &network = resources.construct<fn::MFNetwork>(__func__);
+  MFNetworkTreeMap network_map{tree, network};
+  MultiFunctionByNode functions_by_node;
+
+  CommonMFNetworkBuilderData common{resources, network, network_map, tree};
+
+  for (const DNode *dnode : tree.nodes()) {
+    const bNodeType *node_type = dnode->typeinfo();
+    if (node_type->expand_in_mf_network == nullptr) {
+      /* This node does not have a multi-function implementation. */
+      continue;
+    }
+
+    NodeMFNetworkBuilder builder{common, *dnode};
+    node_type->expand_in_mf_network(builder);
+
+    const fn::MultiFunction *single_function = nullptr;
+    const NodeExpandType expand_type = get_node_expand_type(network_map, *dnode, &single_function);
+
+    switch (expand_type) {
+      case NodeExpandType::HasDummyNodes: {
+        /* Dummy nodes cannot be executed, so skip them. */
+        break;
+      }
+      case NodeExpandType::SingleFunctionNode: {
+        /* This is the common case. Most nodes just expand to a single function. */
+        functions_by_node.add_new(dnode, single_function);
+        break;
+      }
+      case NodeExpandType::MultipleFunctionNodes: {
+        /* If a node expanded into multiple functions, a new function has to be created that
+         * combines those. */
+        const fn::MultiFunction &fn = create_function_for_node_that_expands_into_multiple(
+            *dnode, network, network_map, resources);
+        functions_by_node.add_new(dnode, &fn);
+        break;
+      }
+    }
+  }
+
+  return functions_by_node;
+}
+
 }  // namespace blender::nodes

source/blender/nodes/intern/type_callbacks.cc

@@ -0,0 +1,76 @@
+/*
+ * 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.
+ */
+
+#include "NOD_node_tree_multi_function.hh"
+#include "NOD_type_callbacks.hh"
+
+namespace blender::nodes {
+
+const CPPType *socket_cpp_type_get(const bNodeSocketType &stype)
+{
+  if (stype.get_cpp_type != nullptr) {
+    return stype.get_cpp_type();
+  }
+  return nullptr;
+}
+
+std::optional<MFDataType> socket_mf_type_get(const bNodeSocketType &stype)
+{
+  const CPPType *cpp_type = socket_cpp_type_get(stype);
+  if (cpp_type != nullptr) {
+    return MFDataType::ForSingle(*cpp_type);
+  }
+  return {};
+}
+
+bool socket_is_mf_data_socket(const bNodeSocketType &stype)
+{
+  if (!socket_mf_type_get(stype).has_value()) {
+    return false;
+  }
+  if (stype.expand_in_mf_network == nullptr && stype.get_cpp_value == nullptr) {
+    return false;
+  }
+  return true;
+}
+
+bool socket_cpp_value_get(const bNodeSocket &socket, void *r_value)
+{
+  if (socket.typeinfo->get_cpp_value != nullptr) {
+    socket.typeinfo->get_cpp_value(socket, r_value);
+    return true;
+  }
+  return false;
+}
+
+void socket_expand_in_mf_network(SocketMFNetworkBuilder &builder)
+{
+  bNodeSocket &socket = builder.bsocket();
+  if (socket.typeinfo->expand_in_mf_network != nullptr) {
+    socket.typeinfo->expand_in_mf_network(builder);
+  }
+  else if (socket.typeinfo->get_cpp_value != nullptr) {
+    const CPPType &type = *socket_cpp_type_get(*socket.typeinfo);
+    void *buffer = builder.resources().linear_allocator().allocate(type.size(), type.alignment());
+    socket.typeinfo->get_cpp_value(socket, buffer);
+    builder.set_constant_value(type, buffer);
+  }
+  else {
+    BLI_assert(false);
+  }
+}
+
+}  // namespace blender::nodes

source/blender/nodes/shader/node_shader_util.c

@@ -34,7 +34,7 @@ bool sh_node_poll_default(bNodeType *UNUSED(ntype), bNodeTree *ntree)
 
 static bool sh_fn_poll_default(bNodeType *UNUSED(ntype), bNodeTree *ntree)
 {
-  return STREQ(ntree->idname, "ShaderNodeTree") || STREQ(ntree->idname, "SimulationNodeTree");
+  return STREQ(ntree->idname, "ShaderNodeTree") || STREQ(ntree->idname, "GeometryNodeTree");
 }
 
 void sh_node_type_base(