Wgpu-rs: Why wgpu::TextureFormat::Bgra8UnormSrgb in examples when creating a swapchain?
Is there anything special about this texture format? Is it related to the monitor's format?
sotrh
All 9 comments
Yeah, it's the only texture format that is guaranteed to be natively supported by the swapchains of all the APIs/platforms. Is that a concern for your application?
kvark
on 20 Nov 2019
I think what kvark said should be included in the documentation for wgpu::TextureFormat::Bgra8UnormSrgb
rukai
on 20 Nov 2019
fwiw, upstream WebGPU API has an async method called getSwapChainPreferredFormat. The users would use that format in order to avoid a potential extra blit by the implementation. We just need to provide something like this in wgpu-native and wgpu-rs, which would be better than just documenting a particular format.
kvark
on 20 Nov 2019
It's no problem for me @kvark I just didn't know why it was being used. I'll update my tutorial to add that fact
sotrh
on 23 Nov 2019
Ironically, Bgra8 does not seem to be supported by Vulkan on my Android device:
01-10 12:22:01.492 22964 23010 I RustStdoutStderr: thread '<unnamed>' panicked at 'requested format Bgra8Srgb is not in list of supported formats: [Rgba8Unorm, Rgba8Srgb, R5g6b5Unorm, A2b10g10r10Unorm, Rgba16Sfloat]', /Users/niklaskorz/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-0.6.2/src/backend/direct.rs:1355:35
niklaskorz
on 10 Jan 2021
Interesting! I suppose this is solved by #693 now?
kvark
on 10 Jan 2021
Yes, thankfully it is. 馃槃
niklaskorz
on 10 Jan 2021
Hm actually, it looks like device_get_swap_chain_preferred_format still just returns Bgra8UnormSrgb? So I suppose in that case it wouldn't work, as Bgra8UnormSrgb is not supported as surface format by my device.
Looking at a few other results, this appears to be the case for other (if not most?) SoC GPUs as well:
niklaskorz
on 11 Jan 2021
We need wgpu checking for this and returning a correct value in the preferred format. Could you make an issue in wgpu about this, please?
kvark
on 11 Jan 2021
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Most helpful comment
fwiw, upstream WebGPU API has an async method called getSwapChainPreferredFormat. The users would use that format in order to avoid a potential extra blit by the implementation. We just need to provide something like this in wgpu-native and wgpu-rs, which would be better than just documenting a particular format.