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dawn-cmake/docs/dawn/features/transient_attachments.md
Colin Blundell a406959e50 Add transient attachments and initial Metal support 
This CL does the following:

* Adds a "transient attachment" bit to texture usage. This bit
  specifies that the created texture will be used only during
  this render pass.
* Adds a TransientAttachments Feature that gates the usage of
  transient attachments.
* Adds support for transient attachments on Metal, where they're
  used to create textures as memoryless.
* Adds validation tests and an E2T test of the feature.

A followup CL will add support in Vulkan.

Bug: dawn:1695
Change-Id: I3c7322dd1e4bee113062aae2e0494d292ee8cbc3
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/129080
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
2023-04-27 14:55:09 +00:00

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Transient Attachments

The transient-attachments feature allows creation of attachments that allow render pass operations to stay in tile memory, avoiding VRAM traffic and potentially avoiding VRAM allocation for the textures.

Example Usage:

wgpu::TextureDescriptor desc;
desc.format = wgpu::TextureFormat::RGBA8Unorm;
desc.size = {1, 1, 1};
desc.usage = wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::TransientAttachment;

auto transientTexture = device.CreateTexture(&desc);

// Can now create views from the texture to serve as transient attachments, e.g.
// as color attachments in a render pipeline.

Notes:

  • Only supported usage is wgpu::TextureUsage::RenderAttachment | wgpu::TextureUsage::TransientAttachment
  • It is not possible to load from or store to TextureViews that are used as transient attachments