WebGpuEncoder constructor

Implementation

WebGpuEncoder(
  this._device,
  RenderPassDescriptor descriptor, {
  GPURenderPassTimestampWrites? timestampWrites,
}) : _colorFormats = <String>[
       for (final target in descriptor.colors)
         gpuTextureFormat(target.texture.format)!,
     ],
     _blends = <BlendState?>[for (final _ in descriptor.colors) null],
     _depthFormat = descriptor.depth == null
         ? null
         : gpuTextureFormat(descriptor.depth!.texture.format),
     _sampleCount = descriptor.colors.isNotEmpty
         ? descriptor.colors.first.texture.sampleCount
         : (descriptor.depth?.texture.sampleCount ?? 1) {
  final colors = <GPURenderPassColorAttachment>[
    for (final target in descriptor.colors) _colorAttachment(target),
  ];
  final depth = descriptor.depth;
  _encoder = _device.gpuDevice.createCommandEncoder();
  final gpuDescriptor = depth == null
      ? GPURenderPassDescriptor(
          colorAttachments: colors.toJS,
          label: descriptor.label ?? 'flutter3d pass',
        )
      : GPURenderPassDescriptor.withDepth(
          colorAttachments: colors.toJS,
          depthStencilAttachment: _depthAttachment(depth),
          label: descriptor.label ?? 'flutter3d pass',
        );
  // `H2`: only when the device is timing this pass; the member left out is
  // "none", and a null would be refused.
  if (timestampWrites != null) {
    gpuDescriptor.timestampWrites = timestampWrites;
  }
  _pass = _encoder.beginRenderPass(gpuDescriptor);
}