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r600: always export a position from vertex shader 

This fixes piglit glsl-1.40-tf-no-position from gpu hanging on my rv635
at least.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2013-01-11 13:30:30 +10:00
parent cc5fc8bf2f
commit 199eea4a4b
1 changed files with 17 additions and 0 deletions
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17
src/gallium/drivers/r600/r600_shader.c
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@ -1751,6 +1751,23 @@ static int r600_shader_from_tgsi(struct r600_screen *rscreen,
}
}
/* add fake position export */
if (ctx.type == TGSI_PROCESSOR_VERTEX && next_pos_base == 60) {
memset(&output[j], 0, sizeof(struct r600_bytecode_output));
output[j].gpr = 0;
output[j].elem_size = 3;
output[j].swizzle_x = 7;
output[j].swizzle_y = 7;
output[j].swizzle_z = 7;
output[j].swizzle_w = 7;
output[j].burst_count = 1;
output[j].barrier = 1;
output[j].type = V_SQ_CF_ALLOC_EXPORT_WORD0_SQ_EXPORT_POS;
output[j].array_base = next_pos_base;
output[j].inst = BC_INST(ctx.bc, V_SQ_CF_ALLOC_EXPORT_WORD1_SQ_CF_INST_EXPORT);
j++;
}
/* add fake param output for vertex shader if no param is exported */
if (ctx.type == TGSI_PROCESSOR_VERTEX && next_param_base == 0) {
memset(&output[j], 0, sizeof(struct r600_bytecode_output));