From 1f2bc64f31872f04c27f9aa7a93e63a0091aaabf Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Tue, 3 May 2016 12:43:12 -0400 Subject: [PATCH] freedreno/a4xx: deal with VS which do not write position Fixes $piglit/bin/glsl-1.40-tf-no-position a3xx may need similar? Signed-off-by: Rob Clark --- src/gallium/drivers/freedreno/a4xx/fd4_program.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/gallium/drivers/freedreno/a4xx/fd4_program.c b/src/gallium/drivers/freedreno/a4xx/fd4_program.c index 4396383eef9..9dc4ebbf086 100644 --- a/src/gallium/drivers/freedreno/a4xx/fd4_program.c +++ b/src/gallium/drivers/freedreno/a4xx/fd4_program.c @@ -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) { -- 2.30.2