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Define importing VideoFrame into WebGPU #412

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Define importing VideoFrame into WebGPU #412

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Define importing VideoFrame into WebGPU
kainino0x Nov 25, 2021
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speculatively address comments
kainino0x Dec 2, 2021
690d53b
address comments (hopefully)
kainino0x Dec 9, 2021
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Expand Up @@ -101,6 +101,14 @@

spec: visibility-state; urlPrefix: https://www.w3.org/TR/page-visibility/#
type: enum-value; text: hidden; url: dom-visibilitystate-hidden

spec: webgpu; urlPrefix: https://www.w3.org/TR/webgpu/#
type: interface; text: GPUExternalTexture; url: gpuexternaltexture
type: dictionary; text: GPUExternalTextureDescriptor; url: dictdef-gpuexternaltexturedescriptor
for: GPUExternalTextureDescriptor;
type: dict-member; text: source; url: dom-gpuexternaltexturedescriptor-source
for: GPUDevice;
type: method; text: importExternalTexture(); url: dom-gpudevice-importexternaltexture
</pre>

<pre class='biblio'>
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{{ImageBitmapOptions}} {{ImageBitmapOptions/colorSpaceConversion}}. Setting this
value to "none" disables color space conversion.

### WebGPU ### {#videoframe-webgpu}

WebCodecs extends [[WebGPU]] to allow importing {{VideoFrame}} objects via
{{GPUDevice/importExternalTexture()}}, producing opaque {{GPUExternalTexture}}
objects, which can be read from WebGPU shaders.
The definition of the {{GPUExternalTextureDescriptor/source}} member of
{{GPUExternalTextureDescriptor}} is modified to allow {{VideoFrame}}:

<xmp class='idl'>
partial dictionary GPUExternalTextureDescriptor {
required (HTMLVideoElement or VideoFrame) source;
};
</xmp>

The lifetime of such a {{GPUExternalTexture}} object is implicitly tied to the
lifetime of the source {{VideoFrame}} object.
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When the {{VideoFrame}} is [=Close VideoFrame|closed=]
(e.g. via {{VideoFrame/close()}} or
[[#videoframe-transfer-serialization|transferring the VideoFrame]]),
the {{GPUExternalTexture}} is *destroyed*, so no further operations
using it can be issued.

VideoFrame CopyTo() Options {#videoframe-copyto-options}
------------------------------------------------------------
Options to specify a rectangle of pixels to copy and the offset and stride of
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