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OpenCL C++ wrapper. Is it possible to extract the platform and device from a Context class?


OpenCL C++ wrapper. Is it possible to extract the platform and device from a Context class?

By : chan mandee
Date : November 15 2020, 04:01 AM
wish of those help You can find a list of devices associated with a context by using clGetContextInfo(CL_CONTEXT_DEVICES) function (or Context::getInfo() for C++) . Then you can iterate over these devices and ask for a program build status or a build log for each device.
Same function can be used to get a platform from a context: for CL_CONTEXT_PROPERTIES query will return an array of properties, which should contain a value for CL_CONTEXT_PLATFORM.
code :


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openCL platform/device query

openCL platform/device query


By : Moritz S
Date : March 29 2020, 07:55 AM
will be helpful for those in need Platform is, basically, an installed OpenCL implementation. Physically, it is an ICD record (file in /etc/OpenCL/vendors/ on *nix, registry record in Windows) which helps OpenCL.dll/libOpenCL.so find actual vendor-specific implementation(s).
In your case it looks like since you GPU does not support OpenCL, driver has not added nVidia's library to the list of the platforms. [offtop] I wonder whether it would be required to reinstall driver after upgrading you hardware to CUDA/OpenCL compatible...
In OpenCL, what is the difference between platform, context, and device?

In OpenCL, what is the difference between platform, context, and device?


By : Rooman Kornov
Date : March 29 2020, 07:55 AM
wish helps you A platform is a specific OpenCL implementation, for instance AMD APP, NVIDIA or Intel OpenCL. A context is a platform with a set of available devices for that platform. And the devices are the actual processors (CPU, GPU etc.) that perform calculations.
So if you use the Intel platform, a valid context with this platform would include a CPU device. While if you use the NVIDIA platform, a valid context would include an NVIDIA GPU device.
OpenCL - C++ wrapper - Context deinitialization in dynamic library leads to access violation

OpenCL - C++ wrapper - Context deinitialization in dynamic library leads to access violation


By : I cant delete my pro
Date : March 29 2020, 07:55 AM
Any of those help There's a potential for an very subtle issue if you try to release an OpenCL object from a DllMain. It can show the behavior you are seeing, but can be somewhat unpredictable or intermittent. First, a little background:
When you load OpenCL.dll, on most platforms you are loading a standardized Installable Client Driver (ICD) that is a shim between your code and the various implementations that might exist on your system. You can read more about it here. The ICD is a DLL that uses the Windows LoadLibrary call to load the DLLs provided by the OpenCL vendor (Intel, AMD, etc.).
SDL- get HDC device context for OpenGL/OpenCL shared context

SDL- get HDC device context for OpenGL/OpenCL shared context


By : pkamat
Date : March 29 2020, 07:55 AM
around this issue The most portable and framework agnostic method is to use the platform specific WSI functions to query the drawable and OpenGL context. Using a few typedefs you can make portable wrappers which you can then use to query the context and drawable.
code :
#if defined(_WIN32)
typedef HGLRC GLContext;
typedef HDC   GLDrawable;
typedef HWND  GLWindow;

GLContext getCurrentGLContext(void) { return wglGetCurrentContext(); }
GLDrawable getCurrentGLDrawable(void) { return wglGetCurrentDC(); }
GLWindow getCurrentGLWindow(void) { return WindowFromDC(wglGetCurrentDC()); }
#elif defined(__unix__)
/* FIXME: consider Wayland or a EGL environment */
typedef GLXContext GLContext;
typedef GLXDrawable GLDrawable;
typedef Window GLWindow;

GLContext getCurrentGLContext(void) { return glXGetCurrentContext(); }
GLDrawable getCurrentGLDrawable(void) { return glXGetCurrentDrawable(); }
GLWindow getCurrentGLWindow(void) { return glXGetCurrentDrawable(); }
#elif __APPLE__
/* FIXME: Implement this for MacOS X
#endif
OpenCL only one device in a platform

OpenCL only one device in a platform


By : JB Mike John-Baptist
Date : March 29 2020, 07:55 AM
Any of those help I think you're mixing up some terminology here.
The host is the regular program executing on the CPU itself. The platforms are provided by OpenCL drivers, representing a set of devices and features. The devices are underlying hardware that may be used for OpenCL, provided by a platform.
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