Node: Mix node

This patch is a response to T92588 and is implemented
as a Function/Shader node.

This node has support for Float, Vector and Color data types.

For Vector it supports uniform and non-uniform mixing.

For Color it now has the option to remove factor clamping.

It replaces the Mix RGB for Shader and Geometry node trees.

As discussed in T96219, this patch converts existing nodes
in .blend files. The old node is still available in the
Python API but hidden from the menus.

Reviewed By: HooglyBoogly, JacquesLucke, simonthommes, brecht

Maniphest Tasks: T92588

Differential Revision: https://developer.blender.org/D13749

release/scripts/startup/nodeitems_builtins.py

@@ -424,7 +424,6 @@ shader_node_categories = [
         NodeItem("ShaderNodeTexWhiteNoise"),
     ]),
     ShaderNodeCategory("SH_NEW_OP_COLOR", "Color", items=[
-        NodeItem("ShaderNodeMixRGB"),
         NodeItem("ShaderNodeRGBCurve"),
         NodeItem("ShaderNodeInvert"),
         NodeItem("ShaderNodeLightFalloff"),
@@ -448,6 +447,7 @@ shader_node_categories = [
         NodeItem("ShaderNodeFloatCurve"),
         NodeItem("ShaderNodeClamp"),
         NodeItem("ShaderNodeMath"),
+        NodeItem("ShaderNodeMix"),
         NodeItem("ShaderNodeValToRGB"),
         NodeItem("ShaderNodeRGBToBW"),
         NodeItem("ShaderNodeShaderToRGB", poll=object_eevee_shader_nodes_poll),
@@ -651,7 +651,6 @@ geometry_node_categories = [
         NodeItem("GeometryNodeStoreNamedAttribute"),
     ]),
     GeometryNodeCategory("GEO_COLOR", "Color", items=[
-        NodeItem("ShaderNodeMixRGB"),
         NodeItem("ShaderNodeRGBCurve"),
         NodeItem("ShaderNodeValToRGB"),
         NodeItem("FunctionNodeSeparateColor"),
@@ -719,6 +718,7 @@ geometry_node_categories = [
         NodeItem("FunctionNodeBooleanMath"),
         NodeItem("FunctionNodeRotateEuler"),
         NodeItem("FunctionNodeCompare"),
+        NodeItem("ShaderNodeMix"),
         NodeItem("FunctionNodeFloatToInt"),
         NodeItem("GeometryNodeSwitch"),
         NodeItem("FunctionNodeRandomValue"),