Eevee Cryptomatte: Store hashes in render result meta data

Stores cryptomatte hashes as meta data to the render result. Compositors could
use this for lookup on names in stead of hashes.

Differential Revision: https://developer.blender.org/D9553

2 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/draw/intern/DRW_render.h b/source/blender/draw/intern/DRW_render.h
index f133f3bc6d7..4a43107c612 100644
--- a/source/blender/draw/intern/DRW_render.h
+++ b/source/blender/draw/intern/DRW_render.h
@@ -131,6 +131,7 @@ typedef struct DrawEngineType {
                           struct RenderEngine *engine,
                           struct RenderLayer *layer,
                           const struct rcti *rect);
+  void (*store_metadata)(void *vedata, struct RenderResult *render_result);
 } DrawEngineType;
 
 /* Textures */
diff --git a/source/blender/draw/intern/draw_manager.c b/source/blender/draw/intern/draw_manager.c
index db701c384bd..1115d819659 100644
--- a/source/blender/draw/intern/draw_manager.c
+++ b/source/blender/draw/intern/draw_manager.c
@@ -1911,6 +1911,11 @@ void DRW_render_to_image(RenderEngine *engine, struct Depsgraph *depsgraph)
 
   RE_engine_end_result(engine, render_result, false, false, false);
 
+  if (engine_type->draw_engine->store_metadata) {
+    RenderResult *final_render_result = RE_engine_get_result(engine);
+    engine_type->draw_engine->store_metadata(data, final_render_result);
+  }
+
   /* Force cache to reset. */
   drw_viewport_cache_resize();