Attributes: Infrastructure for generic 8-bit integer data type

This commit adds infrastructure for 8 bit signed integer attributes.
This can be useful given the discussion in T94193, where we want to
store spline type, Bezier handle type, and other small enums as
attributes.

This is only exposed in the interface in the attribute lists, so it
shouldn't be an option in geometry nodes, at least for now.
I expect that this type won't be used directly very often, it
should mostly be cast to an enum type. However, with support
for 8 bit integers, it also makes sense to add things like mixing
implementations for consistency.

Differential Revision: https://developer.blender.org/D13721

1 files changed, 12 insertions, 5 deletions

diff --git a/source/blender/blenkernel/intern/attribute_access.cc b/source/blender/blenkernel/intern/attribute_access.cc
index cc43a3e26a8..68ab11a013b 100644
--- a/source/blender/blenkernel/intern/attribute_access.cc
+++ b/source/blender/blenkernel/intern/attribute_access.cc
@@ -83,6 +83,8 @@ const blender::fn::CPPType *custom_data_type_to_cpp_type(const CustomDataType ty
       return &CPPType::get<ColorGeometry4f>();
     case CD_PROP_BOOL:
       return &CPPType::get<bool>();
+    case CD_PROP_INT8:
+      return &CPPType::get<int8_t>();
     default:
       return nullptr;
   }
@@ -109,6 +111,9 @@ CustomDataType cpp_type_to_custom_data_type(const blender::fn::CPPType &type)
   if (type.is<bool>()) {
     return CD_PROP_BOOL;
   }
+  if (type.is<int8_t>()) {
+    return CD_PROP_INT8;
+  }
   return static_cast<CustomDataType>(-1);
 }
 
@@ -117,16 +122,18 @@ static int attribute_data_type_complexity(const CustomDataType data_type)
   switch (data_type) {
     case CD_PROP_BOOL:
       return 0;
-    case CD_PROP_INT32:
+    case CD_PROP_INT8:
       return 1;
-    case CD_PROP_FLOAT:
+    case CD_PROP_INT32:
       return 2;
-    case CD_PROP_FLOAT2:
+    case CD_PROP_FLOAT:
       return 3;
-    case CD_PROP_FLOAT3:
+    case CD_PROP_FLOAT2:
       return 4;
-    case CD_PROP_COLOR:
+    case CD_PROP_FLOAT3:
       return 5;
+    case CD_PROP_COLOR:
+      return 6;
 #if 0 /* These attribute types are not supported yet. */
     case CD_MLOOPCOL:
       return 3;