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Add importExternalTexture examples with rAF/rVFC rendering #2605

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Mar 16, 2022
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Add importExternalTexture examples with rAF/rVFC rendering #2605

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47 changes: 42 additions & 5 deletions spec/index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -3372,12 +3372,49 @@ dictionary GPUExternalTextureDescriptor : GPUObjectDescriptorBase {
</div>

<div class="example">
Creating an external texture from a video element:
Rendering using an video element external texture at the page animation frame rate:

<pre highlight="js">
const videoElement = document.querySelector('video');
const externalTexture = gpuDevice.importExternalTexture({
source: videoElement
});
const videoElement = document.createElement('video');
// ... set up videoElement, wait for it to be ready...

let externalTexture;

function frame() {
requestAnimationFrame(frame);

// Re-import only if necessary
if (!externalTexture || externalTexture.expired) {
externalTexture = gpuDevice.importExternalTexture({
source: videoElement
});
}

// ... render using externalTexture...
}
requestAnimationFrame(frame);
</pre>
</div>

<div class="example">
Rendering using an video element external texture at the video's frame rate, if
`requestVideoFrameCallback` is available:

<pre highlight="js">
const videoElement = document.createElement('video');
// ... set up videoElement...

function frame() {
videoElement.requestVideoFrameCallback(frame);

// Always re-import, because we know the video frame has advanced
const externalTexture = gpuDevice.importExternalTexture({
source: videoElement
});

// ... render using externalTexture...
}
videoElement.requestVideoFrameCallback(frame);
</pre>
</div>

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