From: Kenneth Graunke <kenneth@whitecape.org>
Date: Tue, 29 Dec 2015 07:59:32 +0000 (-0800)
Subject: nir/spirv/glsl450: Implement FaceForward built-in.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=659a3623b0fa4217fc4e69cccdb3e7a268bca388;p=mesa.git

nir/spirv/glsl450: Implement FaceForward built-in.
---

diff --git a/src/glsl/nir/spirv/vtn_glsl450.c b/src/glsl/nir/spirv/vtn_glsl450.c
index 1b7751a6a88..f81f16789be 100644
--- a/src/glsl/nir/spirv/vtn_glsl450.c
+++ b/src/glsl/nir/spirv/vtn_glsl450.c
@@ -190,6 +190,13 @@ handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
       return;
    }
 
+   case GLSLstd450FaceForward:
+      val->ssa->def =
+         nir_bcsel(nb, nir_flt(nb, nir_fdot(nb, src[2], src[1]),
+                                   nir_imm_float(nb, 0.0)),
+                       src[0], nir_fneg(nb, src[0]));
+      return;
+
    case GLSLstd450Asin:
    case GLSLstd450Acos:
    case GLSLstd450Atan:
@@ -203,7 +210,6 @@ handle_glsl450_alu(struct vtn_builder *b, enum GLSLstd450 entrypoint,
    case GLSLstd450Frexp:
    case GLSLstd450PackDouble2x32:
    case GLSLstd450UnpackDouble2x32:
-   case GLSLstd450FaceForward:
    case GLSLstd450Reflect:
    case GLSLstd450Refract:
    case GLSLstd450IMix: