GLSL: fix clip space mismatch in gl_Position.

OpenGL clips against [-w, w], while WebGPU uses [0, w]. The fix is to
modify gl_Position.z on output to match GLSL semantics. (This is the
same code used by SPIRV-Cross under the fixup_clipspace option.)

Bug: tint:1401
Change-Id: I1b1511352eee11cd9b095cd809aa8e1263c6cf4c
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/78261
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>

src/writer/glsl/generator_impl.cc

@@ -2085,6 +2085,8 @@ bool GeneratorImpl::EmitEntryPointFunction(const ast::Function* func) {
     }
   }
   if (func->PipelineStage() == ast::PipelineStage::kVertex) {
+    out << "  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;"
+        << std::endl;
     out << "  gl_Position.y = -gl_Position.y;" << std::endl;
   }
 

src/writer/glsl/generator_impl_function_test.cc

@@ -292,6 +292,7 @@ void main() {
   col1 = outputs.col1;
   col2 = outputs.col2;
   gl_Position = outputs.pos;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/benchmark/animometer.wgsl.expected.glsl

@@ -83,6 +83,7 @@ void main() {
   outputs = vert_main(inputs);
   v_color = outputs.v_color;
   gl_Position = outputs.Position;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/benchmark/particles.wgsl.expected.glsl

@@ -101,6 +101,7 @@ void main() {
   color = outputs.color;
   quad_pos = outputs.quad_pos;
   gl_Position = outputs.position;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/benchmark/skinned-shadowed-pbr-vertex.wgsl.expected.glsl

@@ -169,6 +169,7 @@ void main() {
   tangent = outputs.tangent;
   bitangent = outputs.bitangent;
   gl_Position = outputs.position;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/bug/chromium/1251009.wgsl.expected.glsl

@@ -49,6 +49,7 @@ void main() {
   tint_symbol_3 outputs;
   outputs = tint_symbol(inputs);
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/bug/dawn/947.wgsl.expected.glsl

@@ -58,6 +58,7 @@ void main() {
   outputs = vs_main(inputs);
   texcoords = outputs.texcoords;
   gl_Position = outputs.position;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/bug/tint/1088.spvasm.expected.glsl

@@ -90,6 +90,7 @@ void main() {
   outputs = tint_symbol_1(inputs);
   vUV_1 = outputs.vUV_1;
   gl_Position = outputs.tint_symbol;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/bug/tint/292.wgsl.expected.glsl

@@ -21,6 +21,7 @@ void main() {
   tint_symbol_1 outputs;
   outputs = tint_symbol();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/bug/tint/403.wgsl.expected.glsl

@@ -46,6 +46,7 @@ void main() {
   tint_symbol_4 outputs;
   outputs = tint_symbol(inputs);
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/bug/tint/824.wgsl.expected.glsl

@@ -40,6 +40,7 @@ void main() {
   outputs = tint_symbol(inputs);
   color = outputs.color;
   gl_Position = outputs.Position;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/bug/tint/922.wgsl.expected.glsl

@@ -180,6 +180,7 @@ void main() {
   v_Color = outputs.v_Color;
   v_TexCoord = outputs.v_TexCoord;
   gl_Position = outputs.member;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/002533.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/005174.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/1ce782.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/1e9d53.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/467cd1.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/4ad288.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/5ad50a.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/7326de.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/7f28e6.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/7faa9e.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/9c80a6.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/abs/b96037.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/acos/489247.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/acos/8e2acf.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/acos/a610c4.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/acos/dfc915.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/all/353d6a.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/all/986c7b.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/all/bd2dba.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/all/f46790.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/any/083428.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/any/0e3e58.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/any/2ab91a.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/any/e755c1.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/arrayLength/1588cd.wgsl.expected.glsl

@@ -34,6 +34,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/arrayLength/61b1c7.wgsl.expected.glsl

@@ -34,6 +34,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/arrayLength/a0f5ca.wgsl.expected.glsl

@@ -34,6 +34,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/arrayLength/cdd123.wgsl.expected.glsl

@@ -34,6 +34,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/arrayLength/cfca0a.wgsl.expected.glsl

@@ -34,6 +34,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/arrayLength/eb510f.wgsl.expected.glsl

@@ -34,6 +34,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/asin/064953.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/asin/7b6a44.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/asin/8cd9c9.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/asin/c0c272.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan/02979a.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan/331e6d.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan/a8b696.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan/ad96e4.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan2/57fb13.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan2/96057c.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan2/a70d0d.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/atan2/ae713e.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/ceil/34064b.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/ceil/678655.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/ceil/96f597.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/ceil/b74c16.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/0acf8f.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/1a32e3.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/2bd567.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/2bde41.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/548fc7.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/5f0819.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/6c1749.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/7706d7.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/867397.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/a2de25.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/b07c65.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/clamp/bd43ce.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cos/16dc15.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cos/29d66d.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cos/c3b486.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cos/c5c28e.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cosh/377652.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cosh/c13756.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cosh/da92dd.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cosh/e0c1de.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/0d0e46.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/0f7980.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/65d2ae.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/690cfc.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/94fd81.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/ae44f9.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/af90e2.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/countOneBits/fd88b2.wgsl.expected.glsl

@@ -26,6 +26,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/cross/041cb0.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/degrees/0d170c.wgsl.expected.glsl

@@ -29,6 +29,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/degrees/1ad5df.wgsl.expected.glsl

@@ -29,6 +29,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/degrees/2af623.wgsl.expected.glsl

@@ -29,6 +29,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/degrees/51f705.wgsl.expected.glsl

@@ -29,6 +29,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/determinant/2b62ba.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/determinant/a0a87c.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/determinant/e19305.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/distance/0657d4.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/distance/9646ea.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/distance/aa4055.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/distance/cfed73.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/dot/0c577b.wgsl.expected.glsl

@@ -24,6 +24,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }
 

test/intrinsics/gen/dot/7548a0.wgsl.expected.glsl

@@ -28,6 +28,7 @@ void main() {
   tint_symbol outputs;
   outputs = vertex_main();
   gl_Position = outputs.value;
+  gl_Position.z = 2.0 * gl_Position.z - gl_Position.w;
   gl_Position.y = -gl_Position.y;
 }