EEVEE-Next: Cryptomatte render passes.

This change adds cryptomatte render passes to EEVEE-Next. Due to the upcoming viewport
compositor we also improved cryptomatte so it will be real-time. This also allows viewing
the cryptomatte passes in the viewport directly.

{F13482749}

A surface shader would store any active cryptomatte layer to a texture. Object hash is stored
as R, Asset hash as G and Material hash as B. Hashes are only calculated when the cryptomatte
layer is active to reduce any unneeded work.

During film accumulation the hashes are separated and stored in a texture array that matches
the cryptomatte standard. For the real-time use case sorting is skipped. For final rendering
the samples are sorted and normalized.

NOTE: Eventually we should also do sample normalization in the viewport in order to extract the correct
mask when using the viewport compositor.

Reviewed By: fclem

Maniphest Tasks: T99390

Differential Revision: https://developer.blender.org/D15753

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_node_graph.h b/source/blender/gpu/intern/gpu_node_graph.h
index 08ff8bbef58..74afb721a1c 100644
--- a/source/blender/gpu/intern/gpu_node_graph.h
+++ b/source/blender/gpu/intern/gpu_node_graph.h
@@ -35,6 +35,7 @@ typedef enum eGPUDataSource {
   GPU_SOURCE_TEX,
   GPU_SOURCE_TEX_TILED_MAPPING,
   GPU_SOURCE_FUNCTION_CALL,
+  GPU_SOURCE_CRYPTOMATTE,
 } eGPUDataSource;
 
 typedef enum {