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freedreno/a3xx: handle VS only outputting BCOLOR

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Possibly we should map the front color to black (zeroes).  But not sure
there is a way to do that without generating a shader variant.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Rob Clark 2014-10-03 10:08:59 -04:00
parent af4d088395
commit a262c601d3
1 changed files with 10 additions and 2 deletions
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12
src/gallium/drivers/freedreno/a3xx/fd3_program.c
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@ -140,13 +140,21 @@ find_output(const struct ir3_shader_variant *so, ir3_semantic semantic)
* in the vertex shader.. but the fragment shader doesn't know this
* so it will always have both IN.COLOR[n] and IN.BCOLOR[n]. So
* at link time if there is no matching OUT.BCOLOR[n], we must map
* OUT.COLOR[n] to IN.BCOLOR[n].
* OUT.COLOR[n] to IN.BCOLOR[n]. And visa versa if there is only
* a OUT.BCOLOR[n] but no matching OUT.COLOR[n]
*/
if (sem2name(semantic) == TGSI_SEMANTIC_BCOLOR) {
unsigned idx = sem2idx(semantic);
return find_output(so, ir3_semantic_name(TGSI_SEMANTIC_COLOR, idx));
semantic = ir3_semantic_name(TGSI_SEMANTIC_COLOR, idx);
} else if (sem2name(semantic) == TGSI_SEMANTIC_COLOR) {
unsigned idx = sem2idx(semantic);
semantic = ir3_semantic_name(TGSI_SEMANTIC_BCOLOR, idx);
}
for (j = 0; j < so->outputs_count; j++)
if (so->outputs[j].semantic == semantic)
return j;
debug_assert(0);
return 0;