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Editorial review: Update docs for Chrome 137 WebGPU additions #39732

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Editorial review: Update docs for Chrome 137 WebGPU additions #39732

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d747fd1
Update docs for Chrome 137 WebGPU additions
chrisdavidmills May 29, 2025
df2c220
Fix nit
chrisdavidmills Jun 2, 2025
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19 changes: 13 additions & 6 deletions files/en-us/web/api/gpucommandencoder/copybuffertobuffer/index.md
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Expand Up @@ -16,22 +16,26 @@ The **`copyBufferToBuffer()`** method of the
## Syntax

```js-nolint
copyBufferToBuffer(source, destination)
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@hamishwillee hamishwillee Jun 2, 2025 •
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The spec says description does not indicate that size is optional in https://gpuweb.github.io/gpuweb/#commands-buffer-copies , but does indicate it in the IDL https://gpuweb.github.io/gpuweb/#gpucommandencoder

So, I think that there are two options, one for copying the whole buffer from 0, and one for copying part of the buffer from 0. I think the note below is still fine though, because it refers to copying the whole buffer.
Might be worth some comment on this case with size though.

Suggested change
copyBufferToBuffer(source, destination)
copyBufferToBuffer(source, destination)
copyBufferToBuffer(source, destination, size)

copyBufferToBuffer(source, sourceOffset, destination, destinationOffset, size)
```

### Parameters

- `source`
- : The {{domxref("GPUBuffer")}} to copy from.
- `sourceOffset`
- `sourceOffset` {{optional_inline}}
- : The offset, in bytes, into the `source` to begin copying from.
- `destination`
- : The {{domxref("GPUBuffer")}} to copy to.
- `destinationOffset`
- `destinationOffset` {{optional_inline}}
- : The offset, in bytes, into the `destination` to begin copying to.
- `size`
- `size` {{optional_inline}}
- : The number of bytes to copy.

> [!NOTE]
> The `sourceOffset`, `destinationOffset`, and `size` can be omitted if you are copying the entire source buffer to the destination buffer.
### Return value

None ({{jsxref("Undefined")}}).
Expand All @@ -49,14 +53,14 @@ The following criteria must be met when calling **`copyBufferToBuffer()`**, othe

## Examples

In our [basic compute demo](https://mdn.github.io/dom-examples/webgpu-compute-demo/), we use `copyBufferToBuffer()` to copy the contents of our `output` buffer to the `stagingBuffer`.
In our [basic compute demo](https://mdn.github.io/dom-examples/webgpu-compute-demo/), we use `copyBufferToBuffer()` to copy the contents of our `outputBuffer` to the `stagingBuffer`.

```js
// …

// Create an output buffer to read GPU calculations to, and a staging buffer to be mapped for JavaScript access

const output = device.createBuffer({
const outputBuffer = device.createBuffer({
size: BUFFER_SIZE,
usage: GPUBufferUsage.STORAGE | GPUBufferUsage.COPY_SRC,
});
Expand All @@ -75,13 +79,16 @@ const commandEncoder = device.createCommandEncoder();

// Copy output buffer to staging buffer
commandEncoder.copyBufferToBuffer(
output,
outputBuffer,
0, // Source offset
stagingBuffer,
0, // Destination offset
BUFFER_SIZE,
);

// Since we are copying the entire buffer, this can be shortened to
// commandEncoder.copyBufferToBuffer(outputBuffer, stagingBuffer);

// …
```

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2 changes: 1 addition & 1 deletion files/en-us/web/api/gpudevice/createbindgroup/index.md
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Expand Up @@ -32,7 +32,7 @@ createBindGroup(descriptor)
- `GPUBufferBinding` (which wraps a {{domxref("GPUBuffer")}}; see [GPUBufferBinding objects](#gpubufferbinding_objects) for a definition)
- {{domxref("GPUExternalTexture")}}
- {{domxref("GPUSampler")}}
- {{domxref("GPUTextureView")}}
- {{domxref("GPUTextureView")}}; can be used in place of a `GPUExternalTexture` provided it is compatible (a 2D format with a single subresource, that is, [`dimension: "2d"`](/en-US/docs/Web/API/GPUTexture/createView#dimension)).
- `label` {{optional_inline}}
- : A string providing a label that can be used to identify the object, for example in {{domxref("GPUError")}} messages or console warnings.
- `layout`
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