mirror of
https://github.com/encounter/dawn-cmake.git
synced 2025-05-13 10:51:35 +00:00
5107db5637
DAWN_DEBUG_BREAK_ON_ERROR executes dawn::BreakPoint inside ErrorData::Create so that an application can inspect their callstack immediately when an error is generated. Bug: dawn:1789 Change-Id: I3f31b9713414d31b69ed469474e0f3c0f714540a Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/133562 Reviewed-by: Loko Kung <lokokung@google.com> Commit-Queue: Austin Eng <enga@chromium.org> Reviewed-by: Brandon Jones <bajones@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com>
50 lines
2.3 KiB
Markdown
50 lines
2.3 KiB
Markdown
# Debugging Dawn
|
|
|
|
## Toggles
|
|
There are various debug-related Toggles that can help diagnose issues. Useful debug toggles:
|
|
- `dump_shaders`: Log input WGSL shaders and translated backend shaders (MSL/ HLSL/DXBC/DXIL / SPIR-V).
|
|
- `disable_symbol_renaming`: As much as possible, disable renaming of symbols (variables, function names, etc.). This can make dumped shaders more readable.
|
|
- `emit_hlsl_debug_symbols`: Sets the D3DCOMPILE_SKIP_OPTIMIZATION and D3DCOMPILE_DEBUG compilation flags when compiling HLSL code.
|
|
- `use_user_defined_labels_in_backend`: Forward object labels to the backend so that they can be seen in native debugging tools like RenderDoc, PIX, or Mac Instruments.
|
|
|
|
Toggles may be enabled/disabled in different ways.
|
|
|
|
- **In code:**
|
|
|
|
Use extension struct `DawnTogglesDescriptor` chained on `DeviceDescriptor`.
|
|
|
|
For example:
|
|
```c++
|
|
const char* const enabledToggles[] = {"dump_shaders", "disable_symbol_renaming"};
|
|
|
|
wgpu::DawnTogglesDescriptor deviceTogglesDesc;
|
|
deviceTogglesDesc.enabledToggles = enabledToggles;
|
|
deviceTogglesDesc.enabledTogglesCount = 2;
|
|
|
|
wgpu::DeviceDescriptor deviceDescriptor;
|
|
deviceDescriptor.nextInChain = &deviceTogglesDesc;
|
|
```
|
|
|
|
- **Command-line for Chrome**
|
|
|
|
Run Chrome with command line flags`--enable-dawn-features` and/or `--disable-dawn-features` to force enable/disable toggles. Toggles should be comma-delimited.
|
|
|
|
For example:
|
|
`--enable-dawn-features=dump_shaders,disable_symbol_renaming`
|
|
|
|
- **Command-line for dawn_end2end_tests/dawn_unittests**
|
|
|
|
Run Dawn test binaries with command line flags`--enable-toggles` and/or `--disable-toggles` to force enable/disable toggles. Toggles should be comma-delimited.
|
|
|
|
For example:
|
|
`dawn_end2end_tests --enable-toggles=dump_shaders,disable_symbol_renaming`
|
|
|
|
## Environment Variables
|
|
|
|
- `DAWN_DEBUG_BREAK_ON_ERROR`
|
|
|
|
Errors in WebGPU are reported asynchronously which may make debugging difficult because at the time an error is reported, you can't easily create a breakpoint to inspect the callstack in your application.
|
|
|
|
Setting `DAWN_DEBUG_BREAK_ON_ERROR` to a non-empty, non-zero value will execute a debug breakpoint
|
|
instruction ([`dawn::Breakpoint()`](https://source.chromium.org/chromium/chromium/src/+/main:third_party/dawn/src/dawn/common/Assert.cpp?q=dawn::Breakpoint)) as soon as any type of error is generated.
|