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

1 files changed, 29 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index b98f8996a2c..4d604fc7eec 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -1697,6 +1697,27 @@ static void versioning_replace_legacy_combined_and_separate_color_nodes(bNodeTre
   }
 }
 
+static void versioning_replace_legacy_mix_rgb_node(bNodeTree *ntree)
+{
+  version_node_input_socket_name(ntree, SH_NODE_MIX_RGB_LEGACY, "Fac", "Factor_Float");
+  version_node_input_socket_name(ntree, SH_NODE_MIX_RGB_LEGACY, "Color1", "A_Color");
+  version_node_input_socket_name(ntree, SH_NODE_MIX_RGB_LEGACY, "Color2", "B_Color");
+  version_node_output_socket_name(ntree, SH_NODE_MIX_RGB_LEGACY, "Color", "Result_Color");
+  LISTBASE_FOREACH (bNode *, node, &ntree->nodes) {
+    if (node->type == SH_NODE_MIX_RGB_LEGACY) {
+      strcpy(node->idname, "ShaderNodeMix");
+      node->type = SH_NODE_MIX;
+      NodeShaderMix *data = (NodeShaderMix *)MEM_callocN(sizeof(NodeShaderMix), __func__);
+      data->blend_type = node->custom1;
+      data->clamp_result = node->custom2;
+      data->clamp_factor = 1;
+      data->data_type = SOCK_RGBA;
+      data->factor_mode = NODE_MIX_MODE_UNIFORM;
+      node->storage = data;
+    }
+  }
+}
+
 static void version_fix_image_format_copy(Main *bmain, ImageFormatData *format)
 {
   /* Fix bug where curves in image format were not properly copied to file output
@@ -3332,5 +3353,13 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
         }
       }
     }
+
+    /* Convert mix rgb node to new mix node and add storage. */
+    {
+      FOREACH_NODETREE_BEGIN (bmain, ntree, id) {
+        versioning_replace_legacy_mix_rgb_node(ntree);
+      }
+      FOREACH_NODETREE_END;
+    }
   }
 }