[Mesa-dev] [PATCH 5/7] util: add dual blend helper function

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

This is just a function to tell if a certain blend mode requires dual sources.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 src/gallium/auxiliary/util/u_dual_blend.h |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)
 create mode 100644 src/gallium/auxiliary/util/u_dual_blend.h

diff --git a/src/gallium/auxiliary/util/u_dual_blend.h b/src/gallium/auxiliary/util/u_dual_blend.h
new file mode 100644
index 0000000..5c2ddab
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_dual_blend.h
@@ -0,0 +1,23 @@
+#ifndef U_DUAL_BLEND_H
+#define U_DUAL_BLEND_H
+
+#include "pipe/p_state.h"
+
+#define util_is_dual_src_blend(x) (((x) == PIPE_BLENDFACTOR_SRC1_COLOR) || \
+				   ((x) == PIPE_BLENDFACTOR_SRC1_ALPHA) || \
+				   ((x) == PIPE_BLENDFACTOR_INV_SRC1_COLOR) || \
+				   ((x) == PIPE_BLENDFACTOR_INV_SRC1_ALPHA))
+
+static INLINE boolean util_blend_state_is_dual(const struct pipe_blend_state *blend, 
+				  int index)
+{
+   if (util_is_dual_src_blend(blend->rt[index].rgb_src_factor) ||
+       util_is_dual_src_blend(blend->rt[index].alpha_src_factor) ||
+       util_is_dual_src_blend(blend->rt[index].rgb_dst_factor) ||
+       util_is_dual_src_blend(blend->rt[index].alpha_dst_factor))
+      return true;
+   return false;
+}
+
+
+#endif
-- 
1.7.7.6