        attributes: [
            {shaderLocation: 0, offset: 0, format: 'float32x2'},  // position
          ],
        },
      ],
    },
    fragment: {
      module,
      targets: [{ format: presentationFormat }],
    },
  });

  // color, matrix
  const uniformBufferSize = (4 + 12) * 4;
  const uniformBuffer = device.createBuffer({
    label: 'uniforms',
    size: uniformBufferSize,
    usage: GPUBufferUsage.UNIFORM | GPUBufferUsage.COPY_DST,
  });

  const uniformValues = new Float32Array(uniformBuff