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GPURenderPassEncoder: setVertexBuffer() method

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

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

Syntax

js

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 GPUBuffer.size - offset.

Return value

None (Undefined).

Validation

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

  • buffer's GPUBuffer.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 GPUBuffer.size.
  • offset is a multiple of 4.

Examples

Set vertex buffer

In our basic render demo, several commands are recorded via a GPUCommandEncoder. Most of these commands originate from the GPURenderPassEncoder created via GPUCommandEncoder.beginRenderPass(). setVertexBuffer() is used as appropriate to set the source of vertex data.

js

// ...

const renderPipeline = device.createRenderPipeline(pipelineDescriptor);

// Create GPUCommandEncoder to issue commands to the GPU
// Note: render pass descriptor, command encoder, etc. are destroyed after use, fresh one needed for each frame.
const commandEncoder = device.createCommandEncoder();

// Create GPURenderPassDescriptor to tell WebGPU which texture to draw into, then initiate render pass
const renderPassDescriptor = {
  colorAttachments: [
    {
      clearValue: clearColor,
      loadOp: "clear",
      storeOp: "store",
      view: context.getCurrentTexture().createView(),
    },
  ],
};

const passEncoder = commandEncoder.beginRenderPass(renderPassDescriptor);

// Draw the triangle
passEncoder.setPipeline(renderPipeline);
passEncoder.setVertexBuffer(0, vertexBuffer);
passEncoder.draw(3);

// End the render pass
passEncoder.end();

// End frame by passing array of command buffers to command queue for execution
device.queue.submit([commandEncoder.finish()]);

// ...

Unset vertex buffer

js

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

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

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
setVertexBuffer
113Currently supported on ChromeOS, macOS, and Windows only.
113Currently supported on ChromeOS, macOS, and Windows only.
previewCurrently supported on Linux and Windows only.
No
99Currently supported on ChromeOS, macOS, and Windows only.
No No No No No No No
unset_vertex_buffer
115Currently supported on ChromeOS, macOS, and Windows only.
115Currently supported on ChromeOS, macOS, and Windows only.
No No
101Currently supported on ChromeOS, macOS, and Windows only.
No No No No No No No

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/GPURenderPassEncoder/setVertexBuffer