Attribute Node: refactor lookup to remove duplication between engines.

Currently lookup of Object and Instancer attributes is completely
duplicated between Cycles, Eevee and Eevee Next. This is bad design,
so this patch aims to deduplicate it by introducing a common API
in blenkernel.

In case of Cycles this requires certain hacks, but according to
Brecht it is planned to be rewritten later for more direct access
to internal Blender data anyway.

Differential Revision: https://developer.blender.org/D16117

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_duplilist.h b/source/blender/blenkernel/BKE_duplilist.h
index cc362495a24..79f37d2edde 100644
--- a/source/blender/blenkernel/BKE_duplilist.h
+++ b/source/blender/blenkernel/BKE_duplilist.h
@@ -64,6 +64,14 @@ typedef struct DupliObject {
   unsigned int random_id;
 } DupliObject;
 
+/** Look up the RGBA value of a uniform shader attribute.
+ *  \return true if the attribute was found; if not, r_value is also set to zero. */
+bool BKE_object_dupli_find_rgba_attribute(struct Object *ob,
+                                          struct DupliObject *dupli,
+                                          struct Object *dupli_parent,
+                                          const char *name,
+                                          float r_value[4]);
+
 #ifdef __cplusplus
 }
 #endif