GPUCompilationInfo

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 GPUCompilationInfo interface of the WebGPU API represents an array of GPUCompilationMessage objects generated by the GPU shader module compiler to help diagnose problems with shader code.

GPUCompilationInfo is accessed via GPUShaderModule.getCompilationInfo().

Instance properties

messages Read only

An array of GPUCompilationMessage objects, each one containing the details of an individual shader compilation message. Messages can be informational, warnings, or errors.

Examples

In the example below, we have deliberately left a parenthesis out of a function declaration in our shader code:

js
const shaders = `
struct VertexOut {
  @builtin(position) position : vec4f,
  @location(0) color : vec4f
}

@vertex
fn vertex_main(@location(0) position: vec4f,
               @location(1) color: vec4f -> VertexOut
{
  var output : VertexOut;
  output.position = position;
  output.color = color;
  return output;
}

@fragment
fn fragment_main(fragData: VertexOut) -> @location(0) vec4f
{
  return fragData.color;
}
`;

When we compile the shader module, we use getCompilationInfo() to grab some information about the resulting error:

js
async function init() {
  // ...

  const shaderModule = device.createShaderModule({
    code: shaders,
  });

  const shaderInfo = await shaderModule.getCompilationInfo();
  const firstMessage = shaderInfo.messages[0];

  console.log(firstMessage.lineNum); // 9
  console.log(firstMessage.message); // "expected ')' for function declaration"
  console.log(firstMessage.type); // "error"
  // ...
}

Specifications

Specification
WebGPU
# gpucompilationinfo

Browser compatibility

BCD tables only load in the browser

See also