Geometry Nodes: Support custom instance attributes

Adds an attribute provider for instance attributes.
A new domain `ATTR_DOMAIN_INSTANCE` is implemented.
Instance attributes are not yet realized correctly.

Differential Revision: D13149

1 files changed, 8 insertions, 5 deletions

diff --git a/source/blender/blenkernel/intern/attribute_access.cc b/source/blender/blenkernel/intern/attribute_access.cc
index f3ece270618..3f2c1f13337 100644
--- a/source/blender/blenkernel/intern/attribute_access.cc
+++ b/source/blender/blenkernel/intern/attribute_access.cc
@@ -164,16 +164,18 @@ CustomDataType attribute_data_type_highest_complexity(Span<CustomDataType> data_
 static int attribute_domain_priority(const AttributeDomain domain)
 {
   switch (domain) {
-    case ATTR_DOMAIN_CURVE:
+    case ATTR_DOMAIN_INSTANCE:
       return 0;
-    case ATTR_DOMAIN_FACE:
+    case ATTR_DOMAIN_CURVE:
       return 1;
-    case ATTR_DOMAIN_EDGE:
+    case ATTR_DOMAIN_FACE:
       return 2;
-    case ATTR_DOMAIN_POINT:
+    case ATTR_DOMAIN_EDGE:
       return 3;
-    case ATTR_DOMAIN_CORNER:
+    case ATTR_DOMAIN_POINT:
       return 4;
+    case ATTR_DOMAIN_CORNER:
+      return 5;
     default:
       /* Domain not supported in nodes yet. */
       BLI_assert_unreachable();
@@ -1448,6 +1450,7 @@ static StringRef get_random_id_attribute_name(const AttributeDomain domain)
 {
   switch (domain) {
     case ATTR_DOMAIN_POINT:
+    case ATTR_DOMAIN_INSTANCE:
       return "id";
     default:
       return "";