Nodes: Add general Combine/Separate Color nodes

Inspired by D12936 and D12929, this patch adds general purpose
"Combine Color" and "Separate Color" nodes to Geometry, Compositor,
Shader and Texture nodes.
- Within Geometry Nodes, it replaces the existing "Combine RGB" and
  "Separate RGB" nodes.
- Within Compositor Nodes, it replaces the existing
  "Combine RGBA/HSVA/YCbCrA/YUVA" and "Separate RGBA/HSVA/YCbCrA/YUVA"
  nodes.
- Within Texture Nodes, it replaces the existing "Combine RGBA" and
  "Separate RGBA" nodes.
- Within Shader Nodes, it replaces the existing "Combine RGB/HSV" and
  "Separate RGB/HSV" nodes.

Python addons have not been updated to the new nodes yet.

**New shader code**
In node_color.h, color.h and gpu_shader_material_color_util.glsl,
missing methods hsl_to_rgb and rgb_to_hsl are added by directly
converting existing C code. They always produce the same result.

**Old code**
As requested by T96219, old nodes still exist but are not displayed in
the add menu. This means Python scripts can still create them as usual.
Otherwise, versioning replaces the old nodes with the new nodes when
opening .blend files.

Differential Revision: https://developer.blender.org/D14034

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/nodes/NOD_texture.h b/source/blender/nodes/NOD_texture.h
index 0f07b17f165..9a2dc705c0d 100644
--- a/source/blender/nodes/NOD_texture.h
+++ b/source/blender/nodes/NOD_texture.h
@@ -46,6 +46,8 @@ void register_node_type_tex_at(void);
 
 void register_node_type_tex_compose(void);
 void register_node_type_tex_decompose(void);
+void register_node_type_tex_combine_color(void);
+void register_node_type_tex_separate_color(void);
 
 void register_node_type_tex_proc_voronoi(void);
 void register_node_type_tex_proc_blend(void);