Vertex shaders can have shader inputs where location happens to be
VARYING_SLOT_FACE. Without predicating this on the shader stage,
we suddenly end up with load_front_face intrinsics in vertex shaders,
which is nonsensical.
Fixes spec/arb_vertex_buffer_object/pos-array when using NIR for VS.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/glsl/nir/glsl_to_nir.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/glsl/nir/glsl_to_nir.cpp b/src/glsl/nir/glsl_to_nir.cpp
index ddad207..047cb51 100644
--- a/src/glsl/nir/glsl_to_nir.cpp
+++ b/src/glsl/nir/glsl_to_nir.cpp
@@ -251,7 +251,8 @@ nir_visitor::visit(ir_variable *ir)
break;
case ir_var_shader_in:
- if (ir->data.location == VARYING_SLOT_FACE) {
+ if (stage == MESA_SHADER_FRAGMENT &&
+ ir->data.location == VARYING_SLOT_FACE) {
/* For whatever reason, GLSL IR makes gl_FrontFacing an input */
var->data.location = SYSTEM_VALUE_FRONT_FACE;
var->data.mode = nir_var_system_value;
--
2.2.1
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