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  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 */
  26.