Eevee: LightCache: Initial Implementation

This separate probe rendering from viewport rendering, making possible to
run the baking in another thread (non blocking and faster).

The baked lighting is saved in the blend file. Nothing needs to be
recomputed on load.

There is a few missing bits / bugs:
- Cache cannot be saved to disk as a separate file, it is saved in the DNA
  for now making file larger and memory usage higher.
- Auto update only cubemaps does update the grids (bug).
- Probes cannot be updated individually (considered as dynamic).
- Light Cache cannot be (re)generated during render.

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/render/render_intern.h b/source/blender/editors/render/render_intern.h
index 77bf16f5e22..585a7999290 100644
--- a/source/blender/editors/render/render_intern.h
+++ b/source/blender/editors/render/render_intern.h
@@ -56,6 +56,9 @@ void MATERIAL_OT_paste(struct wmOperatorType *ot);
 void SCENE_OT_view_layer_add(struct wmOperatorType *ot);
 void SCENE_OT_view_layer_remove(struct wmOperatorType *ot);
 
+void SCENE_OT_light_cache_bake(struct wmOperatorType *ot);
+void SCENE_OT_light_cache_free(struct wmOperatorType *ot);
+
 void SCENE_OT_render_view_add(struct wmOperatorType *ot);
 void SCENE_OT_render_view_remove(struct wmOperatorType *ot);