GLSL: add location layout qualifier before in/out variables.

Bug: tint:1398
Change-Id: I89c985d01d539ed166661ee5e858247cde4702b3
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/78080
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>

test/benchmark/animometer.wgsl.expected.glsl

@@ -72,9 +72,9 @@ tint_symbol_3 vert_main(tint_symbol_2 tint_symbol_1) {
   wrapper_result.v_color = inner_result.v_color;
   return wrapper_result;
 }
-in vec4 position;
-in vec4 color;
-out vec4 v_color;
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec4 color;
+layout(location = 0) out vec4 v_color;
 void main() {
   tint_symbol_2 inputs;
   inputs.position = position;
@@ -136,8 +136,8 @@ tint_symbol_6 frag_main(tint_symbol_5 tint_symbol_4) {
   wrapper_result_1.value = inner_result_1;
   return wrapper_result_1;
 }
-in vec4 v_color;
-out vec4 value;
+layout(location = 0) in vec4 v_color;
+layout(location = 0) out vec4 value;
 void main() {
   tint_symbol_5 inputs;
   inputs.v_color = v_color;

test/benchmark/particles.wgsl.expected.glsl

@@ -86,11 +86,11 @@ tint_symbol_5 vs_main(tint_symbol_4 tint_symbol_3) {
   wrapper_result.quad_pos = inner_result.quad_pos;
   return wrapper_result;
 }
-in vec3 position;
-in vec4 color;
-in vec2 quad_pos;
-out vec4 color;
-out vec2 quad_pos;
+layout(location = 0) in vec3 position;
+layout(location = 1) in vec4 color;
+layout(location = 2) in vec2 quad_pos;
+layout(location = 0) out vec4 color;
+layout(location = 1) out vec2 quad_pos;
 void main() {
   tint_symbol_4 inputs;
   inputs.position = position;
@@ -184,9 +184,9 @@ tint_symbol_8 fs_main(tint_symbol_7 tint_symbol_6) {
   wrapper_result_1.value = inner_result_1;
   return wrapper_result_1;
 }
-in vec4 color;
-in vec2 quad_pos;
-out vec4 value;
+layout(location = 0) in vec4 color;
+layout(location = 1) in vec2 quad_pos;
+layout(location = 0) out vec4 value;
 void main() {
   tint_symbol_7 inputs;
   inputs.color = color;

test/benchmark/shadow-fragment.wgsl.expected.glsl

@@ -64,10 +64,10 @@ tint_symbol_4 tint_symbol(tint_symbol_3 tint_symbol_2) {
   wrapper_result.value = inner_result;
   return wrapper_result;
 }
-in vec3 shadowPos;
-in vec3 fragPos;
-in vec3 fragNorm;
-out vec4 value;
+layout(location = 0) in vec3 shadowPos;
+layout(location = 1) in vec3 fragPos;
+layout(location = 2) in vec3 fragNorm;
+layout(location = 0) out vec4 value;
 void main() {
   tint_symbol_3 inputs;
   inputs.shadowPos = shadowPos;

test/benchmark/simple-fragment.wgsl.expected.glsl

@@ -28,8 +28,8 @@ tint_symbol_4 tint_symbol(tint_symbol_3 tint_symbol_2) {
   wrapper_result.color = inner_result.color;
   return wrapper_result;
 }
-in vec4 color;
-out vec4 color;
+layout(location = 0) in vec4 color;
+layout(location = 0) out vec4 color;
 void main() {
   tint_symbol_3 inputs;
   inputs.color = color;

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

@@ -382,17 +382,17 @@ tint_symbol_5 fragmentMain(tint_symbol_4 tint_symbol_3) {
   wrapper_result.emissive = inner_result.emissive;
   return wrapper_result;
 }
-in vec3 worldPos;
-in vec3 view;
-in vec2 texcoord;
-in vec2 texcoord2;
-in vec4 color;
-in vec4 instanceColor;
-in vec3 normal;
-in vec3 tangent;
-in vec3 bitangent;
-out vec4 color;
-out vec4 emissive;
+layout(location = 0) in vec3 worldPos;
+layout(location = 1) in vec3 view;
+layout(location = 2) in vec2 texcoord;
+layout(location = 3) in vec2 texcoord2;
+layout(location = 4) in vec4 color;
+layout(location = 5) in vec4 instanceColor;
+layout(location = 6) in vec3 normal;
+layout(location = 7) in vec3 tangent;
+layout(location = 8) in vec3 bitangent;
+layout(location = 0) out vec4 color;
+layout(location = 1) out vec4 emissive;
 void main() {
   tint_symbol_4 inputs;
   inputs.worldPos = worldPos;

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

@@ -124,26 +124,26 @@ tint_symbol_4 vertexMain(tint_symbol_3 tint_symbol_2) {
   wrapper_result.bitangent = inner_result.bitangent;
   return wrapper_result;
 }
-in vec4 position;
-in vec3 normal;
-in vec4 tangent;
-in vec2 texcoord;
-in uvec4 joints;
-in vec4 weights;
-in vec4 instance0;
-in vec4 instance1;
-in vec4 instance2;
-in vec4 instance3;
-in vec4 instanceColor;
-out vec3 worldPos;
-out vec3 view;
-out vec2 texcoord;
-out vec2 texcoord2;
-out vec4 color;
-out vec4 instanceColor;
-out vec3 normal;
-out vec3 tangent;
-out vec3 bitangent;
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec3 normal;
+layout(location = 2) in vec4 tangent;
+layout(location = 3) in vec2 texcoord;
+layout(location = 6) in uvec4 joints;
+layout(location = 7) in vec4 weights;
+layout(location = 8) in vec4 instance0;
+layout(location = 9) in vec4 instance1;
+layout(location = 10) in vec4 instance2;
+layout(location = 11) in vec4 instance3;
+layout(location = 12) in vec4 instanceColor;
+layout(location = 0) out vec3 worldPos;
+layout(location = 1) out vec3 view;
+layout(location = 2) out vec2 texcoord;
+layout(location = 3) out vec2 texcoord2;
+layout(location = 4) out vec4 color;
+layout(location = 5) out vec4 instanceColor;
+layout(location = 6) out vec3 normal;
+layout(location = 7) out vec3 tangent;
+layout(location = 8) out vec3 bitangent;
 void main() {
   tint_symbol_3 inputs;
   inputs.position = position;