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spirv: Use the system value version of gl_FrontFace 

SPIR-V treats it as an input but NIR wants the system value.  This
shouldn't have been too much of a surprise given that we have to do the
same conversion in the GLSL IR to NIR pass.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Jason Ekstrand 2016-06-20 23:41:11 -07:00
parent 40013c5033
commit 295e03c980
1 changed files with 2 additions and 2 deletions
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4
src/compiler/spirv/vtn_variables.c
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@ -839,8 +839,8 @@ vtn_get_builtin_location(struct vtn_builder *b,
assert(*mode == nir_var_shader_in);
break;
case SpvBuiltInFrontFacing:
*location = VARYING_SLOT_FACE;
assert(*mode == nir_var_shader_in);
*location = SYSTEM_VALUE_FRONT_FACE;
set_mode_system_value(mode);
break;
case SpvBuiltInSampleId:
*location = SYSTEM_VALUE_SAMPLE_ID;