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我已经坚持了一段时间了；这不是一个特别昂贵的着色器（至少，基于我对 Metal 的非常有限的经验），但我仍然在前几帧收到此消息：

Execution of the command buffer was aborted due to an error during execution. Caused GPU Hang Error (IOAF code 3)

然后我得到这个所有后续帧：

Execution of the command buffer was aborted due to an error during execution. Ignored (for causing prior/excessive GPU errors) (IOAF code 4)

这是顶点着色器，它实际上并没有做任何事情：

vertex VertexOut viewportProgram(uint vertexID [[ vertex_id ]],
                                 constant float2 *positions [[ buffer(0) ]],
                                 constant float2 *texcoords [[ buffer(1) ]]) {
    VertexOut out;

    out.position.xy = positions[vertexID];
    out.position.z = 0.0; // Only 2D; no depth
    out.position.w = 1.0; // Only 2D; no perspective divide

    out.texcoord = texcoords[vertexID];

    return out;
}

这是我的片段着色器，它将颜色从 YUV 转换为 RGB：

fragment float4 colorConvertProgram(VertexOut in [[stage_in]],
                                texture2d<float, access::sample> yTexture [[ texture(0) ]],
                                texture2d<float, access::sample> uvTexture [[ texture(1) ]],
                                sampler textureSampler [[ sampler(0) ]]) {


    float3 colorOffset = float3(-(16.0/255.0), -0.5, -0.5);
    float3x3 colorMatrix = float3x3(float3(1.164,  0.000,  1.596),
                                    float3(1.164, -0.392, -0.813),
                                    float3(1.164,  2.017,  0.000));

    float3 yuv = float3(yTexture.sample(textureSampler, in.texcoord).r,
                    uvTexture.sample(textureSampler, in.texcoord).rg);
    float3 rgb = (yuv + colorOffset) * colorMatrix;

    return float4(rgb, 1.0);
}

这是我的 Swift 代码，将它们组合在一起：

    let samplerDescriptor = MTLSamplerDescriptor()
    samplerDescriptor.minFilter = .linear
    samplerDescriptor.mipFilter = .linear
    samplerDescriptor.sAddressMode = .clampToZero
    samplerDescriptor.tAddressMode = .clampToZero
    let sampler = device.makeSamplerState(descriptor: samplerDescriptor)

    renderEncoder.setViewport(MTLViewport(originX: 0.0, originY: 0.0,
                                          width: Double(bounds.width),
                                          height: Double(bounds.height),
                                          znear: -1.0, zfar: 1.0))
    renderEncoder.setRenderPipelineState(renderPipelineState)
    renderEncoder.setVertexBuffer(vertexPositionBuffer, offset: 0, index: 0)
    renderEncoder.setVertexBuffer(vertexTexcoordBuffer, offset: 0, index: 1)
    renderEncoder.setFragmentTexture(yTexture, index: 0)
    renderEncoder.setFragmentTexture(uvTexture, index: 1)
    renderEncoder.setFragmentSamplerState(sampler, index: 0)
    renderEncoder.drawPrimitives(type: .triangleStrip, vertexStart: 0, vertexCount: 4)
    renderEncoder.endEncoding()

    commandBuffer.present(drawable)
    commandBuffer.commit()
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