Cycles: BVH params option to split leaf node by primitive types

The idea of this change is make it possible to split leaf nodes by primitive
type, making leaf containing primitives of the same type.

This would become handy when working on a single ray to multiple triangles
intersection code, plus with careful implementation it might give some extra
benefits on BVH traversal code by avoiding primitive type fetch and check for
each primitive in the node. But that's a bit tricky to have benefits on this
change only because depth of BVH increases.

This option is not exposed to the interface at all and not used even secretly,
the commit is only needed to help working further in this direction without
messing around with local patches and worrying of them running out of date.

1 files changed, 6 insertions, 1 deletions

diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index aff9a001061..82619b3f854 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -481,7 +481,12 @@ typedef enum PrimitiveType {
 	PRIMITIVE_ALL_TRIANGLE = (PRIMITIVE_TRIANGLE|PRIMITIVE_MOTION_TRIANGLE),
 	PRIMITIVE_ALL_CURVE = (PRIMITIVE_CURVE|PRIMITIVE_MOTION_CURVE),
 	PRIMITIVE_ALL_MOTION = (PRIMITIVE_MOTION_TRIANGLE|PRIMITIVE_MOTION_CURVE),
-	PRIMITIVE_ALL = (PRIMITIVE_ALL_TRIANGLE|PRIMITIVE_ALL_CURVE)
+	PRIMITIVE_ALL = (PRIMITIVE_ALL_TRIANGLE|PRIMITIVE_ALL_CURVE),
+
+	/* Total number of different primitives.
+	 * NOTE: This is an actual value, not a bitflag.
+	 */
+	PRIMITIVE_NUM_TOTAL = 4,
 } PrimitiveType;
 
 #define PRIMITIVE_PACK_SEGMENT(type, segment) ((segment << 16) | type)