Render: Use dependency graph for compositor/sequencer

This change makes it so a minimal dependency graph which only includes
compositor and sequencer is built for the render pipeline purposes.

Tricky part here is that it's only compositor itself and sequencer who
to use this dependency graph and IDs from it. Render engines are still
to be provided original IDs because:

- They will create dependency graph for the given scene, and currently
  it is not possible to create dependency graph from CoW scene.

- IDs from the compositor/sequencer dependency graph are "stripped",
  as in, they wouldn't have all view layers, collections or objects
	required for proper final render.

This creates annoying mess of mixing evaluated and original scene
access in various parts of the pipeline.

Fixes T63927: Compositing nodes - drivers don't really work

Reviewers: brecht

Maniphest Tasks: T63927

Differential Revision: https://developer.blender.org/D4911

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_nodes.h b/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
index 8b9578915a1..c3a04a9ad88 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
+++ b/source/blender/depsgraph/intern/builder/deg_builder_nodes.h
@@ -153,7 +153,9 @@ class DepsgraphNodeBuilder : public DepsgraphBuilder {
 
   void build_id(ID *id);
 
+  void build_scene_render(Scene *scene);
   void build_scene_parameters(Scene *scene);
+  void build_scene_compositor(Scene *scene);
 
   void build_layer_collections(ListBase *lb);
   void build_view_layer(Scene *scene,
@@ -203,7 +205,6 @@ class DepsgraphNodeBuilder : public DepsgraphBuilder {
   void build_texture(Tex *tex);
   void build_image(Image *image);
   void build_world(World *world);
-  void build_compositor(Scene *scene);
   void build_gpencil(bGPdata *gpd);
   void build_cachefile(CacheFile *cache_file);
   void build_mask(Mask *mask);