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dawn-cmake/docs/features/dawn_internal_usages.md
François Beaufort 3f689a4c5a Rename "extension" to "feature" 
This CL renames "extension" to "feature" to follow WebGPU. It still
supports both. A future Chromium CL will pick this change, then all
"extension" occurrences will be removed.

Change-Id: I070e32d7ae042f9b846df01f200b39f6741a0a14
Bug: dawn:1149
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/65664
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
2021-10-04 11:30:02 +00:00

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Dawn Internal Usages

The dawn-internal-usages feature allows adding additional usage which affects how a texture is allocated, but does not affect frontend validation.

One use case for this is so that Chromium can use an internal copyTextureToTexture command to implement copies from a WebGPU texture-backed canvas to other Web platform primitives when the swapchain texture was not explicitly created with CopySrc usage in Javascript.

Usage:

wgpu::DawnTextureInternalUsageDescriptor internalDesc = {};
internalDesc.internalUsage = wgpu::TextureUsage::CopySrc;

wgpu::TextureDescriptor desc = {};
// set properties of desc.
desc.nextInChain = &internalDesc;

device.createTexture(&desc);