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softpipe: Implement PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE for destination.

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It is a valid and tested combination on D3D9.
This commit is contained in:
José Fonseca 2009-11-05 17:05:20 +00:00
parent e0590159ce
commit 67034b9efc
1 changed files with 10 additions and 2 deletions
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12
src/gallium/drivers/softpipe/sp_quad_blend.c
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@ -478,7 +478,15 @@ blend_quad(struct quad_stage *qs,
VEC4_MUL(dest[2], dest[2], dest[2]); /* B */
break;
case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
assert(0); /* illegal */
{
const float *alpha = quadColor[3];
float diff[4], temp[4];
VEC4_SUB(diff, one, dest[3]);
VEC4_MIN(temp, alpha, diff);
VEC4_MUL(dest[0], quadColor[0], temp); /* R */
VEC4_MUL(dest[1], quadColor[1], temp); /* G */
VEC4_MUL(dest[2], quadColor[2], temp); /* B */
}
break;
case PIPE_BLENDFACTOR_CONST_COLOR:
{
@ -600,7 +608,7 @@ blend_quad(struct quad_stage *qs,
VEC4_MUL(dest[3], dest[3], dest[3]); /* A */
break;
case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
assert(0); /* illegal */
/* dest = dest * 1 NO-OP, leave dest as-is */
break;
case PIPE_BLENDFACTOR_CONST_COLOR:
/* fall-through */