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gallium: Add helper to convert PIPE blending to shader_enum style

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Complementing the new API-agnostic shader_enum blending style, we add
helpers to translate between the two forms. Ideally, we could just use
PIPE blending directly, but that makes Vulkan support challenging.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Alyssa Rosenzweig 2019-05-06 02:03:48 +00:00
parent f41be53a17
commit 6b0472b181
1 changed files with 92 additions and 0 deletions
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92
src/gallium/auxiliary/util/u_blend.h
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@ -2,6 +2,7 @@
#define U_BLEND_H
#include "pipe/p_state.h"
#include "compiler/shader_enums.h"
/**
* When faking RGBX render target formats with RGBA ones, the blender is still
@ -22,4 +23,95 @@ util_blend_dst_alpha_to_one(int factor)
}
}
/** To lower blending to software shaders, the Gallium blend mode has to
* be translated to something API-agnostic, as defined in shader_enums.h
* */
static inline enum blend_func
util_blend_func_to_shader(enum pipe_blend_func func)
{
switch (func) {
case PIPE_BLEND_ADD:
return BLEND_FUNC_ADD;
case PIPE_BLEND_SUBTRACT:
return BLEND_FUNC_SUBTRACT;
case PIPE_BLEND_REVERSE_SUBTRACT:
return BLEND_FUNC_REVERSE_SUBTRACT;
case PIPE_BLEND_MIN:
return BLEND_FUNC_MIN;
case PIPE_BLEND_MAX:
return BLEND_FUNC_MAX;
default:
unreachable("Invalid blend function");
}
}
static inline enum blend_factor
util_blend_factor_to_shader(enum pipe_blendfactor factor)
{
switch (factor) {
case PIPE_BLENDFACTOR_ZERO:
case PIPE_BLENDFACTOR_ONE:
return BLEND_FACTOR_ZERO;
case PIPE_BLENDFACTOR_SRC_COLOR:
case PIPE_BLENDFACTOR_INV_SRC_COLOR:
return BLEND_FACTOR_SRC_COLOR;
case PIPE_BLENDFACTOR_SRC_ALPHA:
case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
return BLEND_FACTOR_SRC_ALPHA;
case PIPE_BLENDFACTOR_DST_ALPHA:
case PIPE_BLENDFACTOR_INV_DST_ALPHA:
return BLEND_FACTOR_DST_ALPHA;
case PIPE_BLENDFACTOR_DST_COLOR:
case PIPE_BLENDFACTOR_INV_DST_COLOR:
return BLEND_FACTOR_DST_COLOR;
case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
return BLEND_FACTOR_SRC_ALPHA_SATURATE;
case PIPE_BLENDFACTOR_CONST_COLOR:
case PIPE_BLENDFACTOR_INV_CONST_COLOR:
return BLEND_FACTOR_CONSTANT_COLOR;
case PIPE_BLENDFACTOR_CONST_ALPHA:
case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
return BLEND_FACTOR_CONSTANT_ALPHA;
case PIPE_BLENDFACTOR_SRC1_COLOR:
case PIPE_BLENDFACTOR_SRC1_ALPHA:
case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
/* unimplemented */
assert(0);
return BLEND_FACTOR_ZERO;
default:
unreachable("Invalid factor");
}
}
static inline bool
util_blend_factor_is_inverted(enum pipe_blendfactor factor)
{
switch (factor) {
case PIPE_BLENDFACTOR_ONE:
case PIPE_BLENDFACTOR_INV_SRC_COLOR:
case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
case PIPE_BLENDFACTOR_INV_DST_ALPHA:
case PIPE_BLENDFACTOR_INV_DST_COLOR:
case PIPE_BLENDFACTOR_INV_CONST_COLOR:
case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
return true;
default:
return false;
}
}
#endif /* U_BLEND_H */