u_blend.h revision 01e04c3f 
1#ifndef U_BLEND_H
2#define U_BLEND_H
3
4#include "pipe/p_state.h"
5
6/**
7 * When faking RGBX render target formats with RGBA ones, the blender is still
8 * supposed to treat the destination's alpha channel as 1 instead of the
9 * garbage that's there. Return a blend factor that will take that into
10 * account.
11 */
12static inline int
13util_blend_dst_alpha_to_one(int factor)
14{
15   switch (factor) {
16   case PIPE_BLENDFACTOR_DST_ALPHA:
17      return PIPE_BLENDFACTOR_ONE;
18   case PIPE_BLENDFACTOR_INV_DST_ALPHA:
19      return PIPE_BLENDFACTOR_ZERO;
20   default:
21      return factor;
22   }
23}
24
25#endif /* U_BLEND_H */
26