GPUDevice: createQuerySet() method

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The createQuerySet() method of the GPUDevice interface creates a GPUQuerySet that can be used to record the results of queries on passes, such as occlusion or timestamp queries.

Syntax

js
createQuerySet(descriptor)

Parameters

descriptor

An object containing the following properties:

count

A number specifying the number of queries to be managed by the resulting GPUQuerySet.

label Optional

A string providing a label that can be used to identify the object, for example in GPUError messages or console warnings.

type

An enumerated value specifying the type of queries to be managed by the resulting GPUQuerySet. Possible values are:

"occlusion"

Occlusion queries are available on render passes to query the number of fragment samples that pass all the per-fragment tests for a set of drawing commands (including scissor, sample mask, alpha to coverage, stencil, and depth tests). To run an occlusion query, an appropriate GPUQuerySet must be provided as the value of the occlusionQuerySet descriptor property when invoking GPUCommandEncoder.beginRenderPass() to run a render pass.

"timestamp"

Timestamp queries allow applications to write timestamps to a GPUQuerySet. To run a timestamp query, appropriate GPUQuerySets must be provided inside the value of the timestampWrites descriptor property when invoking GPUCommandEncoder.beginRenderPass() to run a render pass, or GPUCommandEncoder.beginComputePass() to run a compute pass. Alternatively, you can run a single timestamp query at any time by invoking GPUCommandEncoder.writeTimeStamp() with an appropriate GPUQuerySet as a parameter.

Note: The timestamp-query feature needs to be enabled to use timestamp queries.

Return value

A GPUQuerySet object instance.

Validation

The following criteria must be met when calling createQuerySet(), otherwise a GPUValidationError is generated and an invalid GPUQuerySet object is returned:

  • count is less than or equal to 4096.

Examples

The following snippet creates a GPUQuerySet that holds 32 occlusion query results:

js
const querySet = device.createQuerySet({
  type: "occlusion",
  count: 32,
});

Specifications

Specification
WebGPU
# dom-gpudevice-createqueryset

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
createQuerySet
Experimental
Create timestamp queryset types
Experimental

Legend

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Full support
Full support
In development. Supported in a pre-release version.
In development. Supported in a pre-release version.
No support
No support
Experimental. Expect behavior to change in the future.
See implementation notes.
User must explicitly enable this feature.
Has more compatibility info.

See also