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Texture Component Swizzling #1028

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ghost opened this issue Nov 15, 2020 · 2 comments
Closed

Texture Component Swizzling #1028

ghost opened this issue Nov 15, 2020 · 2 comments
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area: api Issues related to API surface help required We need community help to make this happen. type: enhancement New feature or request

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@ghost
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ghost commented Nov 15, 2020

Is there a way currently (or planned in the future) to perform texture component swizzling?

I'm referring to something like:
https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/VkComponentMapping.html

This will be useful for textures with only alpha channels (and similar use cases).
Seems like otherwise we have to use TextureFormat::R* variants and swizzle them to alpha channel in every shader, which does not seem ideal.
@kvark
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kvark commented Nov 15, 2020 •
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This isn't in WebGPU today because of earlier Metal versions. It's a good candidate for an optional feature.
See #754 for an example of how to roll such a feature out. A PR would be appreciated, and we are happy to mentor (ideally, via our "#wgpu:matrix.org" chat).

Edit: also added to https://github.com/gfx-rs/wgpu/wiki/Extensions

@kvark kvark transferred this issue from gfx-rs/wgpu-rs Nov 15, 2020
@kvark kvark changed the title [Question] Texture Component Swizzling Texture Component Swizzling Nov 15, 2020
@kvark kvark added area: api Issues related to API surface help required We need community help to make this happen. type: enhancement New feature or request labels Nov 15, 2020
@cwfitzgerald
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We have no current plans to support this.

@cwfitzgerald cwfitzgerald closed this as not planned Won't fix, can't repro, duplicate, stale Oct 4, 2023
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@kvark @cwfitzgerald