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GPUDevice: createBindGroup() method - Web APIs

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The createBindGroup() method of the GPUDevice interface creates a GPUBindGroup based on a GPUBindGroupLayout that defines a set of resources to be bound together in a group and how those resources are used in shader stages.

createBindGroup(descriptor)

descriptor

An object containing the following properties:

entries

An array of entry objects describing the resources to expose to the shader. There will be one for each corresponding entry described by the GPUBindGroupLayout referenced in layout. Each entry object has the following properties:

binding

A number representing a unique identifier for this resource binding, which matches the binding value of a corresponding GPUBindGroupLayout entry. In addition, it matches the n index value of the corresponding @binding(n) attribute in the shader (GPUShaderModule) used in the related pipeline.

resource

The resource to bind. This can be one of the following:

• GPUBufferBinding (which wraps a GPUBuffer; see GPUBufferBinding objects for a definition)
• GPUExternalTexture
• GPUSampler
• GPUTextureView; can be used in place of a GPUExternalTexture provided it is compatible (a 2D format with a single subresource, that is, dimension: "2d").

label Optional

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

layout

The GPUBindGroupLayout that the entries of this bind group will conform to.

A GPUBufferBinding object can contain the following properties:

buffer

The GPUBuffer object you want to bind.

offset Optional

The offset, in bytes, from the beginning of the buffer to the beginning of the range exposed to the shader by the buffer binding. If omitted, offset defaults to 0.

size Optional

The size, in bytes, of the buffer binding. If omitted, size will be the range starting at offset and ending at the end of the buffer. If both offset and size are omitted, the entire buffer is exposed to the shader.

A GPUBindGroup object instance.

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

• The number of entries in the layout GPUBindGroupLayout equals the number of entry objects in entries.
• For each entry in the layout GPUBindGroupLayout, the corresponding entry object in entries binds the correct resource type. For example, a buffer resource layout object has a GPUBufferBinding object specified in the corresponding binding.
• If the resource layout object is a buffer:
  • The corresponding bound GPUBuffer:
    • Has its bound part (as specified by offset and size) contained inside it completely, with a non-zero size.
    • Has a size bigger than the buffer resource layout's minBindingSize.
  • If the resource layout object type is "uniform":
    • The bound GPUBuffer has a usage that includes GPUBufferUsage.UNIFORM.
    • The effective size of the bound buffer segment is less than or equal to the GPUDevice's maxUniformBufferBindingSize limit.
    • The specified GPUBufferBinding offset is a multiple of the GPUDevice's minUniformBufferOffsetAlignment limit.
  • If the resource layout object type is "storage" or "read-only-storage":
    • The bound GPUBuffer has a usage that includes GPUBufferUsage.STORAGE.
    • The effective size of the bound buffer segment is less than or equal to the GPUDevice's maxStorageBufferBindingSize limit.
    • The effective size of the bound buffer segment is a multiple of 4.
    • The specified GPUBufferBinding offset is a multiple of the GPUDevice's minStorageBufferOffsetAlignment limit.
• If the resource layout object is a storageTexture, the corresponding bound GPUTextureView:
  • Has a dimension equal to the resource layout object's viewDimension (see GPUTexture.createView() for more details of a texture view's settings).
  • Has a format equal to the resource layout object's sampleType.
  • Has a mipLevelCount equal to 1.
  • Is a view of a GPUTexture with a usage that includes GPUTextureUsage.STORAGE_BINDING.
• If the resource layout object is a texture, the corresponding bound GPUTextureView:
  • Has a dimension equal to the resource layout object's viewDimension (see GPUTexture.createView() for more details of a texture view's settings).
  • Has a format compatible with the resource layout object's sampleType.
  • Is a view of a GPUTexture with a usage that includes GPUTextureUsage.TEXTURE_BINDING.
  • is a view of a GPUTexture with a sampleCount greater than 1 if the resource layout object's multisampled property is true, or equal to 1 if it is false.

Note: The WebGPU samples feature many more examples.

Our basic compute demo shows an example of creating a bind group layout and then using that as a template when creating a bind group.

// …

const bindGroupLayout = device.createBindGroupLayout({
  entries: [
    {
      binding: 0,
      visibility: GPUShaderStage.COMPUTE,
      buffer: {
        type: "storage",
      },
    },
  ],
});

const bindGroup = device.createBindGroup({
  layout: bindGroupLayout,
  entries: [
    {
      binding: 0,
      resource: {
        buffer: output,
      },
    },
  ],
});

// …

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