Function createGridRenderer

src/renderers/createGridRenderer.ts:135–314

(device: GPUDevice, options?: GridRendererOptions)

};

export function createGridRenderer(device: GPUDevice, options?: GridRendererOptions): GridRenderer {
  let disposed = false;
  const targetFormat = options?.targetFormat ?? DEFAULT_TARGET_FORMAT;

  const bindGroupLayout = device.createBindGroupLayout({
    entries: [
      { binding: 0, visibility: GPUShaderStage.VERTEX, buffer: { type: 'uniform' } },
      { binding: 1, visibility: GPUShaderStage.FRAGMENT, buffer: { type: 'uniform' } },
    ],
  });

  const vsUniformBuffer = createUniformBuffer(device, 64, { label: 'gridRenderer/vsUniforms' });
  const fsUniformBuffer = createUniformBuffer(device, 16, { label: 'gridRenderer/fsUniforms' });

  const bindGroup = device.createBindGroup({
    layout: bindGroupLayout,
    entries: [
      { binding: 0, resource: { buffer: vsUniformBuffer } },
      { binding: 1, resource: { buffer: fsUniformBuffer } },
    ],
  });

  const pipeline = createRenderPipeline(device, {
    label: 'gridRenderer/pipeline',
    bindGroupLayouts: [bindGroupLayout],
    vertex: {
      code: gridWgsl,
      label: 'grid.wgsl',
      buffers: [
        {
          arrayStride: 8, // vec2<f32> = 2 * 4 bytes
          stepMode: 'vertex',
          attributes: [{ shaderLocation: 0, format: 'float32x2', offset: 0 }],
        },
      ],
    },
    fragment: {
      code: gridWgsl,
      label: 'grid.wgsl',
      formats: targetFormat,
      // Enable standard alpha blending so `fsUniforms.color.a` behaves as expected
      // (blends into the cleared background instead of making the canvas pixels transparent).
      blend: {
        color: { operation: 'add', srcFactor: 'src-alpha', dstFactor: 'one-minus-src-alpha' },
        alpha: { operation: 'add', srcFactor: 'one', dstFactor: 'one-minus-src-alpha' },
      },
    },
    primitive: { topology: 'line-list', cullMode: 'none' },
    multisample: { count: 1 },
  });

  let vertexBuffer: GPUBuffer | null = null;
  let vertexCount = 0;

  const assertNotDisposed = (): void => {
    if (disposed) throw new Error('GridRenderer is disposed.');
  };