Question

我的计算机上有两个GPU，一个来自我的CPU，另一个来自我的图形卡。

我正在尝试使用opengl / opencl互操作功能。但是我被困在opencl上下文的创建中，我不知道如何识别opengl使用的两个平台/设备。

在上面的代码中，我应该在测试“ DEVICE MATCHING OPENGL ONE”中使用哪种功能来测试设备是否为OpenGL使用的设备，或者我应该怎么做来测试platform_id是否是好的？

sf::ContextSettings settings;
settings.depthBits = 24;
settings.stencilBits = 8;
settings.antialiasingLevel = 2;
sf::Window window(sf::VideoMode(2048, 1024), "GAME",
        sf::Style::Fullscreen, settings);

glewInit();

cl_platform_id platform_ids[16] = { NULL };
cl_device_id device_id = NULL;
cl_uint ret_num_devices;
cl_uint ret_num_platforms;

cl_platform_id platform_id = 0;
cl_int ret = clGetPlatformIDs(_countof(platform_ids), platform_ids,
            &ret_num_platforms);

size_t n = 0;

cl_context_properties props[] = { CL_GL_CONTEXT_KHR,
        (cl_context_properties) wglGetCurrentContext(), CL_WGL_HDC_KHR,
        (cl_context_properties) wglGetCurrentDC(), CL_CONTEXT_PLATFORM,
        (cl_context_properties) platform_id, 0 };

for (size_t i = 0; i < ret_num_platforms; ++i) {
    platform_id = platform_ids[i];
    cl_device_id curDevices_id[16];

    ret = clGetDeviceIDs(platform_id, CL_DEVICE_TYPE_GPU,
                _countof(curDevices_id), curDevices_id, &ret_num_devices);

    for (cl_uint nDevices = 0; nDevices < ret_num_devices; ++nDevices) {
        cl_device_id curDevice_id = curDevices_id[nDevices];

        clGetGLContextInfoKHR_fn clGetGLContextInfo =
                reinterpret_cast<clGetGLContextInfoKHR_fn> 
                (clGetExtensionFunctionAddressForPlatform(
                            platform_id, "clGetGLContextInfoKHR"));

        if (clGetGLContextInfo) {
            cl_device_id clGLDevice = 0;
            props[5] =
                    reinterpret_cast<cl_context_properties>(platform_id);
            clGetGLContextInfo(props,
                    CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR,
                    sizeof(clGLDevice), &clGLDevice, &n);

            if (DEVICE MATCHING OPENGL ONE) {
                    device_id = clGLDevice;
            }
        }
    }
    if (device_id) {
        break;
    }
}

cl_context context = clCreateContext(props, 1, &device_id, NULL, NULL,
        &ret);

Answer 1

使用Kronos认可的扩展名“ cl_khr_gl_sharing”。将使用clGetDeviceInfo返回CL_DEVICE_EXTENSIONS。

https://www.khronos.org/registry/OpenCL/sdk/1.2/docs/man/xhtml/cl_khr_gl_sharing.html

检索与opengl匹配的opencl平台

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