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freedreno/a4xx: deal with VS which do not write position

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Fixes $piglit/bin/glsl-1.40-tf-no-position

a3xx may need similar?

Signed-off-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Rob Clark
2016-05-03 12:43:12 -04:00
parent a6ad30202c
commit 1f2bc64f31
1 changed files with 7 additions and 0 deletions
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7
src/gallium/drivers/freedreno/a4xx/fd4_program.c
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@@ -229,6 +229,13 @@ fd4_program_emit(struct fd_ringbuffer *ring, struct fd4_emit *emit,
constmode = 1;
pos_regid = ir3_find_output_regid(s[VS].v, VARYING_SLOT_POS);
if (pos_regid == regid(63, 0)) {
/* hw dislikes when there is no position output, which can
* happen for transform-feedback vertex shaders. Just tell
* the hw to use r0.x, with whatever random value is there:
*/
pos_regid = regid(0, 0);
}
posz_regid = ir3_find_output_regid(s[FS].v, FRAG_RESULT_DEPTH);
psize_regid = ir3_find_output_regid(s[VS].v, VARYING_SLOT_PSIZ);
if (s[FS].v->color0_mrt) {