Function checkGLInterop

examples/opencl/cl_helpers.h:36–101

#endif

bool checkGLInterop(const cl::Platform &plat,  const cl::Device &pDevice, const forge::Window &wnd)
{
    bool ret_val = false;
    // find the extension required
    std::string exts = pDevice.getInfo<CL_DEVICE_EXTENSIONS>();
    std::stringstream ss(exts);
    std::string item;

    while (std::getline(ss,item,' ')) {
        if (item == CL_GL_SHARING_EXT) {
            ret_val = true;
            break;
        }
    }

    if (!ret_val) return false;

#if !defined(OS_MAC) // Check on Linux, Windows
    // Check if current OpenCL device is belongs to the OpenGL context

#if defined(OS_LNX)
    cl_context_properties cps[] = {
        CL_GL_CONTEXT_KHR, (cl_context_properties)wnd.context(),
        CL_GLX_DISPLAY_KHR, (cl_context_properties)wnd.display(),
        CL_CONTEXT_PLATFORM, (cl_context_properties)plat(),
        0
    };
#else /* OS_WIN */
    cl_context_properties cps[] = {
        CL_GL_CONTEXT_KHR, (cl_context_properties)wnd.context(),
        CL_WGL_HDC_KHR, (cl_context_properties)wnd.display(),
        CL_CONTEXT_PLATFORM, (cl_context_properties)plat(),
        0
    };
#endif

    // Load the extension
    // If cl_khr_gl_sharing is available, this function should be present
    // This has been checked earlier, it comes to this point only if it is found
    auto func = (clGetGLContextInfoKHR_fn)
        clGetExtensionFunctionAddressForPlatform(plat(), "clGetGLContextInfoKHR");

    if (!func) return false;

    // Get all devices associated with opengl context
    std::vector<cl_device_id> devices(16);
    size_t ret = 0;
    cl_int err = func(cps,
                      CL_DEVICES_FOR_GL_CONTEXT_KHR,
                      devices.size() * sizeof(cl_device_id),
                      devices.data(),
                      &ret);

    if (err != CL_SUCCESS) return false;

    int num = (int)(ret / sizeof(cl_device_id));
    devices.resize(num);