Fix T92442: undo removal of Eevee cryptomatte accurate mode option

The Cycles accurate mode was removed, but the Eevee option for this has
a different meaning and should not have been removed. The Eevee accurate
makes cryptomatte accumulate for every sample, which Cycles has always
done regardless of any option.

release/scripts/modules/rna_manual_reference.py

@@ -215,6 +215,7 @@ url_manual_mapping = (
 	("bpy.types.toolsettings.use_proportional_connected*", "editors/3dview/controls/proportional_editing.html#bpy-types-toolsettings-use-proportional-connected"),
 	("bpy.types.toolsettings.use_proportional_projected*", "editors/3dview/controls/proportional_editing.html#bpy-types-toolsettings-use-proportional-projected"),
 	("bpy.types.view3doverlay.vertex_paint_mode_opacity*", "editors/3dview/display/overlays.html#bpy-types-view3doverlay-vertex-paint-mode-opacity"),
+	("bpy.types.viewlayer.use_pass_cryptomatte_accurate*", "render/layers/passes.html#bpy-types-viewlayer-use-pass-cryptomatte-accurate"),
 	("bpy.types.viewlayer.use_pass_cryptomatte_material*", "render/layers/passes.html#bpy-types-viewlayer-use-pass-cryptomatte-material"),
 	("bpy.ops.gpencil.vertex_color_brightness_contrast*", "grease_pencil/modes/vertex_paint/editing.html#bpy-ops-gpencil-vertex-color-brightness-contrast"),
 	("bpy.ops.view3d.edit_mesh_extrude_individual_move*", "modeling/meshes/editing/face/extrude_faces.html#bpy-ops-view3d-edit-mesh-extrude-individual-move"),

release/scripts/startup/bl_ui/properties_view_layer.py

@@ -192,6 +192,8 @@ class ViewLayerCryptomattePanel(ViewLayerButtonsPanel, Panel):
                           view_layer.use_pass_cryptomatte_material,
                           view_layer.use_pass_cryptomatte_asset))
         col.prop(view_layer, "pass_cryptomatte_depth", text="Levels")
+        col.prop(view_layer, "use_pass_cryptomatte_accurate",
+                 text="Accurate Mode")
 
 
 class VIEWLAYER_PT_layer_passes_cryptomatte(ViewLayerCryptomattePanel, Panel):

source/blender/blenkernel/intern/layer.c

@@ -183,6 +183,7 @@ static ViewLayer *view_layer_add(const char *name)
   view_layer->passflag = SCE_PASS_COMBINED;
   view_layer->pass_alpha_threshold = 0.5f;
   view_layer->cryptomatte_levels = 6;
+  view_layer->cryptomatte_flag = VIEW_LAYER_CRYPTOMATTE_ACCURATE;
   BKE_freestyle_config_init(&view_layer->freestyle_config);
 
   return view_layer;

source/blender/blenloader/intern/versioning_290.c

@@ -1435,6 +1435,7 @@ void blo_do_versions_290(FileData *fd, Library *UNUSED(lib), Main *bmain)
       LISTBASE_FOREACH (Scene *, scene, &bmain->scenes) {
         LISTBASE_FOREACH (ViewLayer *, view_layer, &scene->view_layers) {
           view_layer->cryptomatte_levels = 6;
+          view_layer->cryptomatte_flag = VIEW_LAYER_CRYPTOMATTE_ACCURATE;
         }
       }
     }

source/blender/draw/engines/eevee/eevee_cryptomatte.c

@@ -139,6 +139,8 @@ void EEVEE_cryptomatte_renderpasses_init(EEVEE_Data *vedata)
     g_data->cryptomatte_session = session;
 
     g_data->render_passes |= EEVEE_RENDER_PASS_CRYPTOMATTE | EEVEE_RENDER_PASS_VOLUME_LIGHT;
+    g_data->cryptomatte_accurate_mode = (view_layer->cryptomatte_flag &
+                                         VIEW_LAYER_CRYPTOMATTE_ACCURATE) != 0;
   }
 }
 
@@ -403,6 +405,7 @@ void EEVEE_cryptomatte_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EE
 {
   EEVEE_FramebufferList *fbl = vedata->fbl;
   EEVEE_StorageList *stl = vedata->stl;
+  EEVEE_PrivateData *g_data = stl->g_data;
   EEVEE_EffectsInfo *effects = stl->effects;
   EEVEE_PassList *psl = vedata->psl;
   const DRWContextState *draw_ctx = DRW_context_state_get();
@@ -410,9 +413,10 @@ void EEVEE_cryptomatte_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EE
   const int cryptomatte_levels = view_layer->cryptomatte_levels;
   const int current_sample = effects->taa_current_sample;
 
-  /* Render samples used by cryptomatte are limited to the number of cryptomatte levels. This will
-   * reduce the overhead of downloading the GPU buffer and integrating it into the accum buffer. */
-  if (current_sample < cryptomatte_levels) {
+  /* In accurate mode all render samples are evaluated. In inaccurate mode this is limited to the
+   * number of cryptomatte levels. This will reduce the overhead of downloading the GPU buffer and
+   * integrating it into the accum buffer. */
+  if (g_data->cryptomatte_accurate_mode || current_sample < cryptomatte_levels) {
     static float clear_color[4] = {0.0};
     GPU_framebuffer_bind(fbl->cryptomatte_fb);
     GPU_framebuffer_clear_color(fbl->cryptomatte_fb, clear_color);

source/blender/draw/engines/eevee/eevee_private.h

@@ -1042,6 +1042,7 @@ typedef struct EEVEE_PrivateData {
   int aov_hash;
   int num_aovs_used;
   struct CryptomatteSession *cryptomatte_session;
+  bool cryptomatte_accurate_mode;
   EEVEE_CryptomatteSample *cryptomatte_accum_buffer;
   float *cryptomatte_download_buffer;
 

source/blender/makesdna/DNA_layer_types.h

@@ -68,7 +68,7 @@ typedef enum eViewLayerCryptomatteFlags {
   VIEW_LAYER_CRYPTOMATTE_OBJECT = (1 << 0),
   VIEW_LAYER_CRYPTOMATTE_MATERIAL = (1 << 1),
   VIEW_LAYER_CRYPTOMATTE_ASSET = (1 << 2),
-  /* VIEW_LAYER_CRYPTOMATTE_ACCURATE = (1 << 3), */ /* DEPRECATED */
+  VIEW_LAYER_CRYPTOMATTE_ACCURATE = (1 << 3),
 } eViewLayerCryptomatteFlags;
 #define VIEW_LAYER_CRYPTOMATTE_ALL \
   (VIEW_LAYER_CRYPTOMATTE_OBJECT | VIEW_LAYER_CRYPTOMATTE_MATERIAL | VIEW_LAYER_CRYPTOMATTE_ASSET)

source/blender/makesrna/intern/rna_scene.c

@@ -4166,6 +4166,13 @@ void rna_def_view_layer_common(BlenderRNA *brna, StructRNA *srna, const bool sce
         prop, "Cryptomatte Levels", "Sets how many unique objects can be distinguished per pixel");
     RNA_def_property_ui_range(prop, 2.0, 16.0, 2.0, 0.0);
     RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_ViewLayer_pass_update");
+
+    prop = RNA_def_property(srna, "use_pass_cryptomatte_accurate", PROP_BOOLEAN, PROP_NONE);
+    RNA_def_property_boolean_sdna(prop, NULL, "cryptomatte_flag", VIEW_LAYER_CRYPTOMATTE_ACCURATE);
+    RNA_def_property_boolean_default(prop, true);
+    RNA_def_property_ui_text(
+        prop, "Cryptomatte Accurate", "Generate a more accurate cryptomatte pass");
+    RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_ViewLayer_pass_update");
   }
 
   prop = RNA_def_property(srna, "use_solid", PROP_BOOLEAN, PROP_NONE);