Hello.
I have quite old hardware in my laptop with switchable graphics - Intel HD 4000 and Radeon HD 7670M.
Switchable graphics works but behaves unexpectedly.
I have following code to choose opencl device for texture interop
for(auto& platform : platforms)
{
clGetGLContextInfoKHR_fn pclGetGLContextInfoKHR = (clGetGLContextInfoKHR_fn)
clGetExtensionFunctionAddressForPlatform(platform(), "clGetGLContextInfoKHR");
if (!pclGetGLContextInfoKHR)
continue;
cl_context_properties properties[] =
{
CL_GL_CONTEXT_KHR, (cl_context_properties)wglGetCurrentContext(),
CL_WGL_HDC_KHR, (cl_context_properties)wglGetCurrentDC(),
CL_CONTEXT_PLATFORM, (cl_context_properties)platform(),
0
};
cl_device_id device_id;
size_t value_size_ret;
if (CL_SUCCESS != pclGetGLContextInfoKHR(properties, CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR
, sizeof(cl_device_id), &device_id, &value_size_ret))
continue;
if (0 == value_size_ret)
continue;
return std::unique_ptr<cl::Device>(new cl::Device(device_id));
}
return nullptr;
It chooses intel instead of amd but for some reason works although slow. I can choose amd device explicitly and it works faster.
I don't understand why Intel opencl device doesn't lead to crash and why intel is chosen instead of amd for high performance settings.
