How to use dawn backend.

[Block Micro]

I'm a bit confused about the graphite dawn backend. After building skia with graphite and dawn build option on, it seems that there's already a dawn_native packed in skia.lib. The question is how can I use the dawn_native in it to create a context associated with glfw window?

Currently I've tried to use the dawn's headers and directly link with skia.lib(without linking to libdawn_native) and with webgpu_glfw for the glfw functionalities. However, things went wrong. I got a text validation failure which says:

[graphite] ** ERROR ** validate_backend_texture failed: backendTex.info = Dawn(format=0x00000017,usage=0x00000010,sampleCount=1,mipmapped=0,protected=0); colorType = 4

Besides, when building Debug builds, constructing skgpu::graphite::BackendTexture with WGPUTexture clears the whole stack, making everything 0, which is supreme weird.

Is there any simple example projects that's constructed with skia graphite, dawn and glfw that I can learn from? Any help'll be appreciated.

[Block Micro]

any idea?

[Jim Van Verth]

There are no examples with GLFW, but there are some in tools/window that show how to set up Dawn with various backend types (Metal, Vulkan, and D3D12).

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Jim Van Verth | Software Engineer | Google.com

[Block Micro]

> Besides, when building Debug builds, constructing skgpu::graphite::BackendTexture with WGPUTexture clears the whole stack, making everything 0, which is supremely weird.

I eventually figured this out. It's caused by the header mismatch. When compiling skia, as both Vulkan and Dawn backends are enabled, the size of BackendTexture is 100 bytes, but when compiling my own app, the size of it is only 64 bytes.

The debug process is here: https://t.me/microblock_pub/176

在2024年1月27日星期六 UTC+8 03:17:10<Block Micro> 写道：