From: Jason Ekstrand <jason.ekstrand@intel.com>
Date: Tue, 21 Jun 2016 06:41:11 +0000 (-0700)
Subject: spirv: Use the system value version of gl_FrontFace
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=295e03c980a7ff6dde77abcb6bbfa2f8d015323b;p=mesa.git

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>
---

diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index 61fc184a692..fe2494ba3b3 100644
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -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;