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util: Add a helper to convert color blend factors to alpha

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39171>
This commit is contained in:
Faith Ekstrand 2026-01-07 11:52:07 -05:00 • committed by Marge Bot
parent 5eabbfcf78
commit fabc316c3f
1 changed files with 40 additions and 0 deletions
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40
src/util/blend.h
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@ -9,6 +9,8 @@
#include <stdbool.h>
#include "util/macros.h"
#define PIPE_BLENDFACTOR_INVERT_BIT (0x10)
enum pipe_blendfactor {
@ -51,6 +53,44 @@ util_blendfactor_without_invert(enum pipe_blendfactor factor)
return (enum pipe_blendfactor)(factor & ~PIPE_BLENDFACTOR_INVERT_BIT);
}
/**
* Color blend factor enums are treated as their alpha counterpart when used
* as the alpha blend factor. This helper just converts from color to alpha.
*/
static inline enum pipe_blendfactor
util_blendfactor_to_alpha(enum pipe_blendfactor factor)
{
switch (factor) {
#define UTIL_BLENDFACTOR_TO_ALPHA_CASE(x) \
case PIPE_BLENDFACTOR_##x##_COLOR: \
return PIPE_BLENDFACTOR_##x##_ALPHA; \
case PIPE_BLENDFACTOR_INV_##x##_COLOR: \
return PIPE_BLENDFACTOR_INV_##x##_ALPHA;
UTIL_BLENDFACTOR_TO_ALPHA_CASE(SRC)
UTIL_BLENDFACTOR_TO_ALPHA_CASE(DST)
UTIL_BLENDFACTOR_TO_ALPHA_CASE(CONST)
UTIL_BLENDFACTOR_TO_ALPHA_CASE(SRC1)
#undef UTIL_BLENDFACTOR_TO_ALPHA_CASE
case PIPE_BLENDFACTOR_ONE:
case PIPE_BLENDFACTOR_SRC_ALPHA:
case PIPE_BLENDFACTOR_DST_ALPHA:
case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
case PIPE_BLENDFACTOR_CONST_ALPHA:
case PIPE_BLENDFACTOR_SRC1_ALPHA:
case PIPE_BLENDFACTOR_ZERO:
case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
case PIPE_BLENDFACTOR_INV_DST_ALPHA:
case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
return factor;
}
UNREACHABLE("Invalid blend factor");
}
enum pipe_blend_func {
PIPE_BLEND_ADD,
PIPE_BLEND_SUBTRACT,