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

2 files changed, 14 insertions, 2 deletions

diff --git a/source/blender/makesdna/DNA_layer_types.h b/source/blender/makesdna/DNA_layer_types.h
index 2176df7f4ec..b9aadcaf183 100644
--- a/source/blender/makesdna/DNA_layer_types.h
+++ b/source/blender/makesdna/DNA_layer_types.h
@@ -34,10 +34,18 @@ typedef enum eViewLayerEEVEEPassType {
   EEVEE_RENDER_PASS_AO = (1 << 13),
   EEVEE_RENDER_PASS_BLOOM = (1 << 14),
   EEVEE_RENDER_PASS_AOV = (1 << 15),
+  /*
+   * TODO(jbakker): Clean up confliting bits after EEVEE has been removed.
+   * EEVEE_RENDER_PASS_CRYPTOMATTE is for EEVEE, EEVEE_RENDER_PASS_CRYTPOMATTE_* are for
+   * EEVEE-Next.
+   */
   EEVEE_RENDER_PASS_CRYPTOMATTE = (1 << 16),
-  EEVEE_RENDER_PASS_VECTOR = (1 << 17),
+  EEVEE_RENDER_PASS_CRYPTOMATTE_OBJECT = (1 << 16),
+  EEVEE_RENDER_PASS_CRYPTOMATTE_ASSET = (1 << 17),
+  EEVEE_RENDER_PASS_CRYPTOMATTE_MATERIAL = (1 << 18),
+  EEVEE_RENDER_PASS_VECTOR = (1 << 19),
 } eViewLayerEEVEEPassType;
-#define EEVEE_RENDER_PASS_MAX_BIT 18
+#define EEVEE_RENDER_PASS_MAX_BIT 20
 
 /* #ViewLayerAOV.type */
 typedef enum eViewLayerAOVType {
diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index 40345c31fef..f184460cba4 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -304,6 +304,10 @@ typedef enum eScenePassType {
 #define RE_PASSNAME_BLOOM "BloomCol"
 #define RE_PASSNAME_VOLUME_LIGHT "VolumeDir"
 
+#define RE_PASSNAME_CRYPTOMATTE_OBJECT "CryptoObject"
+#define RE_PASSNAME_CRYPTOMATTE_ASSET "CryptoAsset"
+#define RE_PASSNAME_CRYPTOMATTE_MATERIAL "CryptoMaterial"
+
 /** View - MultiView. */
 typedef struct SceneRenderView {
   struct SceneRenderView *next, *prev;