Ios 由于执行期间出错，命令缓冲区的执行被中止

我已经在这上面呆了一段时间了；这不是一个特别昂贵的着色器（至少，基于我对金属的有限经验），但在前几帧中，我仍然得到了以下信息：

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

然后我在所有后续帧中得到这个：

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，它实际上什么都不做：

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);
}

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您是手动触发绘图代码，还是由metal view代理自动触发？不知道这是否是问题所在，但znear值无效。来自：“znear和zfar的值必须分别在0.0和1.0之间。”@miweinst我正在触发它manually@KenThomases我不知道，谢谢！不幸的是，这不是问题，虽然，仍然有相同的错误信息，我应该说，一个GPU挂起总是一个驱动程序错误。无论提交什么任务，用户级进程都不能挂起GPU。所以，寻找解决方法是有意义的，这并不是你的错。你应该向苹果公司提交一个bug。

    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()