Support non-sRGB image formats for RenderTarget::Image
#22031
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I believe it was a bug that ManualTextureView::format could be different from the format of the actual wgpu::Texture.
I believe it was a bug that OutputColorAttachment::format could have been different from the actual format of the wgpu::Texture. This also fixes bevyengine#15201
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CI failure doesn't immediately seem relevant to my changes https://github.com/bevyengine/bevy/actions/runs/19949128748/job/57205300759?pr=22031 |
We know that main_texture_format cannot be anything but Rgba16Float or Rgba8UnormSrgb.
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Objective
RenderTarget::Imagedoesn't supportRgba8UnormandBgra8Unormtexture formats (non-srgb formats) #15201Solution
OutputColorAttachment::formatcould be different from the actual underlying texture format (ofOutputColorAttachment::view). This would eventually lead to a texture format mismatch on theBlitPipeline. I removed theOutputColorAttachment::formatfield to resolve this conflict.ManualTextureView.Testing
RenderTarget::Imagedoesn't supportRgba8UnormandBgra8Unormtexture formats (non-srgb formats) #15201 no longer cause a WGPU validation error.pbrexample on native and WebGPU and it still works as before.Future Work
Although the WGPU validation error is fixed, when using a non-sRGB texture format for the GPU image in the
headless_rendererexample, the output image seems to have incorrect gamma. I think this is because the example does a byte-for-byte copy from the GPU image to the CPU image without any gamma correction; and theimagecrate saves the image assuming a nonlinear color space.I don't think we need to fix this as part of this PR, but it might be nice for
bevy_image::Image::try_into_dynamicto eventually handle the gamma correction when saving linear color images.Here you can see a comparison
With sRGBNo sRGB
