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spirv: Flip the tessellation winding order

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It's not SPIR-V that's backwards from GLSL, it's Vulkan that's backwards
from GL.  Let's make NIR consistent with the source language and do the
flipping inside the Vulkan driver instead.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand
2017-04-28 07:12:24 -07:00
parent 2891115671
commit fc91cbe20b
3 changed files with 15 additions and 8 deletions
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13
src/intel/vulkan/genX_pipeline.c
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@@ -1217,7 +1217,18 @@ emit_3dstate_hs_te_ds(struct anv_pipeline *pipeline)
anv_batch_emit(&pipeline->batch, GENX(3DSTATE_TE), te) {
te.Partitioning = tes_prog_data->partitioning;
te.OutputTopology = tes_prog_data->output_topology;
/* Vulkan has its winding order backwards from GL so TRI_CCW becomes
* TRI_CW and vice versa.
*/
if (tes_prog_data->output_topology == OUTPUT_TRI_CCW) {
te.OutputTopology = OUTPUT_TRI_CW;
} else if (tes_prog_data->output_topology == OUTPUT_TRI_CW) {
te.OutputTopology = OUTPUT_TRI_CCW;
} else {
te.OutputTopology = tes_prog_data->output_topology;
}
te.TEDomain = tes_prog_data->domain;
te.TEEnable = true;
te.MaximumTessellationFactorOdd = 63.0;