Added new toggle EmitHLSLDebugSymbols to improve shader debugging capabilities by external tools.

Bug: dawn:776
Change-Id: I1a9082463ee61d7b0427740b4075d6a69c3b5946
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/52282
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

src/dawn_native/Toggles.cpp

@@ -176,10 +176,15 @@ namespace dawn_native {
               "GPUs which have a driver bug in the execution of CopyTextureRegion() when we copy "
               "with the formats whose texel block sizes are less than 4 bytes from a greater mip "
               "level to a smaller mip level on D3D12 backends.",
-              "https://crbug.com/1161355"}}
+              "https://crbug.com/1161355"}},
+            {Toggle::EmitHLSLDebugSymbols,
+             {"emit_hlsl_debug_symbols",
+              "Sets the D3DCOMPILE_SKIP_OPTIMIZATION and D3DCOMPILE_DEBUG compilation flags when "
+              "compiling HLSL code. Enables better shader debugging with external graphics "
+              "debugging tools.",
+              "https://crbug.com/dawn/776"}}
             // Dummy comment to separate the }} so it is clearer what to copy-paste to add a toggle.
         }};
-
     }  // anonymous namespace
 
     void TogglesSet::Set(Toggle toggle, bool enabled) {

src/dawn_native/Toggles.h

@@ -51,6 +51,7 @@ namespace dawn_native {
         UseTintGenerator,
         FlushBeforeClientWaitSync,
         UseTempBufferInSmallFormatTextureToTextureCopyFromGreaterToLessMipLevel,
+        EmitHLSLDebugSymbols,
 
         EnumCount,
         InvalidEnum = EnumCount,

src/dawn_native/d3d12/ComputePipelineD3D12.cpp

@@ -35,10 +35,11 @@ namespace dawn_native { namespace d3d12 {
     MaybeError ComputePipeline::Initialize(const ComputePipelineDescriptor* descriptor) {
         Device* device = ToBackend(GetDevice());
         uint32_t compileFlags = 0;
-#if defined(_DEBUG)
+
-        // Enable better shader debugging with the graphics debugging tools.
+        if (device->IsToggleEnabled(Toggle::EmitHLSLDebugSymbols)) {
             compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
-#endif
+        }
+
         // SPRIV-cross does matrix multiplication expecting row major matrices
         compileFlags |= D3DCOMPILE_PACK_MATRIX_ROW_MAJOR;
 

src/dawn_native/d3d12/DeviceD3D12.cpp

@@ -541,6 +541,11 @@ namespace dawn_native { namespace d3d12 {
         SetToggle(Toggle::UseDXC, false);
         SetToggle(Toggle::UseTintGenerator, false);
 
+#if defined(_DEBUG)
+        // Enable better shader debugging with the graphics debugging tools.
+        SetToggle(Toggle::EmitHLSLDebugSymbols, true);
+#endif
+
         // By default use the maximum shader-visible heap size allowed.
         SetToggle(Toggle::UseD3D12SmallShaderVisibleHeapForTesting, false);
 

src/dawn_native/d3d12/RenderPipelineD3D12.cpp

@@ -335,10 +335,11 @@ namespace dawn_native { namespace d3d12 {
     MaybeError RenderPipeline::Initialize(const RenderPipelineDescriptor* descriptor) {
         Device* device = ToBackend(GetDevice());
         uint32_t compileFlags = 0;
-#if defined(_DEBUG)
+
-        // Enable better shader debugging with the graphics debugging tools.
+        if (device->IsToggleEnabled(Toggle::EmitHLSLDebugSymbols)) {
             compileFlags |= D3DCOMPILE_DEBUG | D3DCOMPILE_SKIP_OPTIMIZATION;
-#endif
+        }
+
         // SPRIV-cross does matrix multiplication expecting row major matrices
         compileFlags |= D3DCOMPILE_PACK_MATRIX_ROW_MAJOR;