GPURenderBundleEncoder: setVertexBuffer() method

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The setVertexBuffer() method of the GPURenderBundleEncoder interface sets or unsets the current GPUBuffer for the given slot that will provide vertex data for subsequent drawing commands.

[!NOTE] This method is functionally identical to its equivalent on GPURenderPassEncoder — setVertexBuffer().

Syntax

setVertexBuffer(slot, buffer, offset, size)

Parameters

• slot
  • : A number referencing the vertex buffer slot to set the vertex buffer for.
• buffer
  • : A GPUBuffer representing the buffer containing the vertex data to use for subsequent drawing commands, or null, in which case any previously-set buffer in the given slot is unset.
• offset Optional
  • : A number representing the offset, in bytes, into buffer where the vertex data begins. If omitted, offset defaults to 0.
• size Optional
  • : A number representing the size, in bytes, of the vertex data contained in buffer. If omitted, size defaults to the buffer’s size - offset.

Return value

None (undefined).

Validation

The following criteria must be met when calling setVertexBuffer(), otherwise a GPUValidationError is generated and the GPURenderBundleEncoder becomes invalid:

• buffer’s usage contains the GPUBufferUsage.VERTEX flag.
• slot is less than the GPUDevice’s maxVertexBuffers limit.
• offset + size is less than or equal to the buffer’s size.
• offset is a multiple of 4.

Examples

Set vertex buffer

function recordRenderPass(passEncoder) {
  if (settings.dynamicOffsets) {
    passEncoder.setPipeline(dynamicPipeline);
  } else {
    passEncoder.setPipeline(pipeline);
  }
  passEncoder.setVertexBuffer(0, vertexBuffer);
  passEncoder.setBindGroup(0, timeBindGroup);
  const dynamicOffsets = [0];
  for (let i = 0; i < numTriangles; ++i) {
    if (settings.dynamicOffsets) {
      dynamicOffsets[0] = i * alignedUniformBytes;
      passEncoder.setBindGroup(1, dynamicBindGroup, dynamicOffsets);
    } else {
      passEncoder.setBindGroup(1, bindGroups[i]);
    }
    passEncoder.draw(3, 1, 0, 0);
  }
}

The above snippet is taken from the WebGPU Samples Animometer example.

Unset vertex buffer

// Set vertex buffer in slot 0
passEncoder.setVertexBuffer(0, vertexBuffer);

// Later, unset vertex buffer in slot 0
passEncoder.setVertexBuffer(0, null);

Specifications

Browser compatibility

See also

• The WebGPU API