Perfetto

[Romaric Jodin]

Hi everyone,

I would like to be able to get perfetto tracepoint out of dawn.
Is this something already implemented? I don't see them in my trace, what should be required to have them? Something in the build configuration, or the perfetto config file?

Thanks,
Romaric

[Austin Eng]

To get tracing from Dawn, you need to implement dawn::platform::Platform and override GetCategoriyTraceEnabledFlag, AddTraceEvent, and MonotonicallyIncreasingTime. Then you can send them to perfetto in your implementation of AddTraceEvent. You'll pass that Platform object in when you create the wgpu::Instance.

Here is how Chrome does it, using this implementation of dawn::platform::Platform.
Something like:

dawn::platform::Platform* platform = new MyPlatform();

dawn::native::DawnInstanceDescriptor dawn_instance_desc;
dawn_instance_desc.platform = platform;

wgpu::InstanceDescriptor instance_desc;

instance_desc.nextInChain = &dawn_instance_desc;

wgpu::Instance instance = CreateInstance(&instance_desc);

Cheers,

Austin

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