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Merged
kvark merged 2 commits into from
Apr 15, 2021
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Explainer: image input #1638

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Explainer: image input
kainino0x Apr 15, 2021
40d7b4e
address comments
kainino0x Apr 15, 2021
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@kainino0x
kainino0x committed Apr 15, 2021
commit 40d7b4e53611373b88cc4b875c19b7b082e422e1
11 changes: 6 additions & 5 deletions explainer/index.bs
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Expand Up @@ -819,16 +819,17 @@ Issue: Update both names to whatever we settle on.

### GPUExternalTexture ### {#image-input-external-texture}

A `GPUExternalTexture` is a read-only texture object which can be used in similar ways to normal
`GPUTexture` objects.
A `GPUExternalTexture` is a sampleable texture object which can be used in similar ways to normal
sampleable `GPUTexture` objects.
In particular, it can be bound as a texture resource to a shader and used directly from the GPU:
when it is bound, additional metadata is attached that allows WebGPU to "automagically"
transform the data from its underlying representation (e.g. YUV) to RGB sampled data.

`GPUExternalTexture`s represent a particular immutable image, so the underlying data must not
change after import. To achieve this:
A `GPUExternalTexture` represents a particular imported image, so the underlying data must not
change after import, either from internal (WebGPU) or external (Web platform) access.

Issue: Describe how this works for video element, VideoFrame, canvas element, and OffscreenCanvas.
Issue:
Describe how this is achieved for video element, VideoFrame, canvas element, and OffscreenCanvas.


## Canvas Output ## {#canvas-output}
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