c++ - 由于 DirectX，OpenCV 构建失败

Question

我正在关注这个 guide在 Windows 7 下为 Qt5 编译 OpenCV。 我正在使用:

• CMake 3.14.3
• OpenCV 4.1.0
• Qt 5.12.2

我按照说明配置和设置了参数。然后开始编译。它失败并出现许多类似的错误:

C:\opencv\sources\modules\core\src\directx.cpp:1055:5: error: 'cl_context' was not declared in this scope
     cl_context context = (cl_context)ctx.ptr();
     ^~~~~~~~~~
C:\opencv\sources\modules\core\src\directx.cpp:1055:5: note: suggested alternative: '_onexit'
     cl_context context = (cl_context)ctx.ptr();
     ^~~~~~~~~~
     _onexit
C:\opencv\sources\modules\core\src\directx.cpp:1057:5: error: 'cl_int' was not declared in this scope
     cl_int status = 0;
     ^~~~~~
C:\opencv\sources\modules\core\src\directx.cpp:1057:5: note: suggested alternative: 'lrint'
     cl_int status = 0;
     ^~~~~~
     lrint
C:\opencv\sources\modules\core\src\directx.cpp:1058:12: error: expected ';' before 'clImage'
     cl_mem clImage = 0;
            ^~~~~~~
C:\opencv\sources\modules\core\src\directx.cpp:1062:5: error: 'clImage' was not declared in this scope
     clImage = clCreateFromD3D11Texture2DNV(context, CL_MEM_WRITE_ONLY, pD3D11Texture2D, 0, &status);
     ^~~~~~~
C:\opencv\sources\modules\core\src\directx.cpp:1062:5: note: suggested alternative: 'IplImage'
     clImage = clCreateFromD3D11Texture2DNV(context, CL_MEM_WRITE_ONLY, pD3D11Texture2D, 0, &status);
     ^~~~~~~
     IplImage
C:\opencv\sources\modules\core\src\directx.cpp:1062:44: error: 'context' was not declared in this scope
     clImage = clCreateFromD3D11Texture2DNV(context, CL_MEM_WRITE_ONLY, pD3D11Texture2D, 0, &status);
                                            ^~~~~~~
C:\opencv\sources\modules\core\src\directx.cpp:1062:44: note: suggested alternative: 'onexit'
     clImage = clCreateFromD3D11Texture2DNV(context, CL_MEM_WRITE_ONLY, pD3D11Texture2D, 0, &status);
                                            ^~~~~~~
                                            onexit
C:\opencv\sources\modules\core\src\directx.cpp:1062:53: error: 'CL_MEM_WRITE_ONLY' was not declared in this scope
     clImage = clCreateFromD3D11Texture2DNV(context, CL_MEM_WRITE_ONLY, pD3D11Texture2D, 0, &status);

我在 CMake 中禁用了 WITH_DIRECTX 标志，然后:

1. 配置
2. 生成
3. mingw32-make clean
4. mingw32-make -j 8

但是错误仍然存​​在。 我还必须做些什么来解决这个问题？

Answer 1

要禁用 directx，我还必须关闭所有与 OpenCL 相关的项目:

• OPENCL_FOUND
• OPENCV_DNN_OPENCL
• WITH_OPENCL
• WITH_OPENCLAMDBLAS
• WITH_OPENCLAMDFFT
• 使用 OPENCL_D3D11_NV
• WITH_OPENCL_SVM

要理解 OpenCL 与 DirectX 的关系并不是那么简单。