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r600: workaround empty geom shader.

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We need to emit at least one cut/emit in every
geometry shader, the easiest workaround it to
stick a single CUT at the top of each geom shader.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Cc: "10.6 11.0 11.1" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit 4f34722575)
This commit is contained in:
Dave Airlie 2015-02-24 14:09:40 +10:00 • committed by Emil Velikov
parent dd37db0c80
commit f1bb27acc5
1 changed files with 5 additions and 0 deletions
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5
src/gallium/drivers/r600/r600_shader.c
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@ -2206,6 +2206,11 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
if (ctx.type == TGSI_PROCESSOR_GEOMETRY) {
struct r600_bytecode_alu alu;
int r;
/* GS thread with no output workaround - emit a cut at start of GS */
if (ctx.bc->chip_class == R600)
r600_bytecode_add_cfinst(ctx.bc, CF_OP_CUT_VERTEX);
for (j = 0; j < 4; j++) {
memset(&alu, 0, sizeof(struct r600_bytecode_alu));
alu.op = ALU_OP1_MOV;