src/gallium/auxiliary/util/u_blend.h

   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  */
  12 static inline int
  13 util_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 */