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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/GPUCanvasContext/configure below:

GPUCanvasContext: configure() method - Web APIs

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The configure() method of the GPUCanvasContext interface configures the context to use for rendering with a given GPUDevice. When called the canvas will initially be cleared to transparent black.

configuration

An object containing the following properties:

alphaMode Optional

An enumerated value that specifies the effect that alpha values will have on the content of textures returned by getCurrentTexture() when read, displayed, or used as an image source. Possible values are:

• opaque: Alpha values are ignored — if a texture is not already opaque, the alpha channel is cleared to 1.0 when it is used as an image source or displayed to the screen. This is the default value.
• premultiplied: Color values are premultiplied by their alpha value. For example, 100% red at 50% alpha is [0.5, 0, 0, 0.5].

colorSpace Optional

The color space that values written into textures returned by getCurrentTexture() should be displayed with. Possible values are srgb (the default) and display-p3.

device

The GPUDevice that the rendering information for the context will come from.

format

The format that textures returned by getCurrentTexture() will have. This can be bgra8unorm, rgba8unorm, or rgba16float. The optimal canvas texture format for the current system can be returned by GPU.getPreferredCanvasFormat(). Using this is recommended — if you don't use the preferred format when configuring the canvas context, you may incur additional overhead, such as additional texture copies, depending on the platform.

toneMapping Optional

An object specifying parameters that define the tone mapping for the context — how the content of associated textures are to be displayed. This allows WebGPU to draw colors brighter than white (#FFFFFF). Possible properties are:

mode Optional

An enumerated value specifying the tone mapping mode for the canvas. Possible values include:

standard

The default value. Restricts rendered content to the Standard Dynamic Range (SDR) of the display. This mode is accomplished by clamping all color values in the color space of the screen to the [0, 1] interval.

extended

Allows content to be rendered in the full High Dynamic Range (HDR) of the display, where available. HDR mode allows a wider range of colors and brightness levels to be displayed, with more precise instructions as to what color should be displayed in each case. This mode matches "standard" in the [0, 1] range of the screen. Clamping or projection is done to the extended dynamic range of the screen but not [0, 1].

usage Optional

Bitwise flags specifying the allowed usage for textures returned by getCurrentTexture(). Possible values are:

• GPUTextureUsage.COPY_SRC: The texture can be used as the source of a copy operation, for example the source argument of a GPUCommandEncoder.copyTextureToBuffer() call.
• GPUTextureUsage.COPY_DST: The texture can be used as the destination of a copy/write operation, for example the destination argument of a GPUCommandEncoder.copyTextureToTexture() call.
• GPUTextureUsage.RENDER_ATTACHMENT: The texture can be used as a color attachment in a render pass, for example in a color attachment view in a GPUCommandEncoder.beginRenderPass() call. GPUTextureUsage.RENDER_ATTACHMENT is the default usage, but note that it is not automatically included if a different value is explicitly set; in such cases you need to include it in addition.
• GPUTextureUsage.TEXTURE_BINDING: The texture can be bound for use as a sampled texture in a shader, for example in a bind group entry in a GPUDevice.createBindGroup() call.
• GPUTextureUsage.STORAGE_BINDING: The texture can be bound for use as a storage texture in a shader, for example in a bind group entry in a GPUDevice.createBindGroup() call.

Note that multiple possible usages can be specified using the bitwise OR operator. For example, usage: GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT.

viewFormats Optional

An array of formats that views created from textures returned by getCurrentTexture() may use. See Texture Formats for all the possible values.

None (undefined).

const canvas = document.querySelector("#gpuCanvas");
const context = canvas.getContext("webgpu");

context.configure({
  device,
  format: navigator.gpu.getPreferredCanvasFormat(),
  alphaMode: "premultiplied",
});

See the Particles (HDR) sample and HDR support test.

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