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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[BUG] createGLBuffer and copyToGLBuffer do not point to the same device","articleBody":"If you have more than one display cards, all the examples in forge/examples/opencl will fail. \r\n\r\nA temporary workaround  is to  modify createCLGLContext in cl_helpers.h so that cl::Context always use the last device instead of the first device.  But it is not a solution at all. \r\n\r\n```\r\nvoid get_devices(const forge::Window \u0026wnd,\r\n                 std::vector\u003ccl::Platform\u003e \u0026platforms_interop,\r\n                 std::vector\u003cDevice\u003e \u0026devices_interop) {\r\n  std::vector\u003ccl::Platform\u003e platforms;\r\n  Platform::get(\u0026platforms);\r\n\r\n  for (auto platform : platforms) {\r\n    std::vector\u003ccl::Device\u003e devices;\r\n    try {\r\n      platform.getDevices(CL_DEVICE_TYPE_GPU, \u0026devices);\r\n      for (auto device : devices) {\r\n        if (checkGLInterop(platform, device, wnd)) {\r\n          devices_interop.push_back(device);\r\n          platforms_interop.push_back(platform);\r\n        }\r\n      }\r\n\r\n    } catch (const cl::Error \u0026err) {\r\n      if (err.err() != CL_DEVICE_NOT_FOUND) {\r\n        std::cout \u003c\u003c \"Platform: \" \u003c\u003c platform.getInfo\u003cCL_PLATFORM_NAME\u003e()\r\n                  \u003c\u003c \" got error = \" \u003c\u003c err.err() \u003c\u003c std::endl;\r\n        throw std::runtime_error(\"Fatal Error!\");\r\n      }\r\n    }\r\n  }\r\n  if (devices_interop.size() == 0)\r\n    throw std::runtime_error(\"No CL-GL sharing contexts found\");\r\n}\r\n\r\ncl::Context createCLGLContext(const forge::Window \u0026wnd, cl::Platform platform,\r\n                              cl::Device device) {\r\n  // std::cout \u003c\u003c \"Platform: \" \u003c\u003c platform.getInfo\u003cCL_PLATFORM_NAME\u003e()\r\n  //           \u003c\u003c std::endl;\r\n  // std::cout \u003c\u003c \"Device: \" \u003c\u003c device.getInfo\u003cCL_DEVICE_NAME\u003e() \u003c\u003c std::endl;\r\n#if defined(OS_MAC)\r\n  CGLContextObj cgl_current_ctx = CGLGetCurrentContext();\r\n  CGLShareGroupObj cgl_share_group = CGLGetShareGroup(cgl_current_ctx);\r\n\r\n  cl_context_properties cps[] = {CL_CONTEXT_PROPERTY_USE_CGL_SHAREGROUP_APPLE,\r\n                                 (cl_context_properties)cgl_share_group, 0};\r\n#elif defined(OS_LNX)\r\n  cl_context_properties cps[] = {CL_GL_CONTEXT_KHR,\r\n                                 (cl_context_properties)wnd.context(),\r\n                                 CL_GLX_DISPLAY_KHR,\r\n                                 (cl_context_properties)wnd.display(),\r\n                                 CL_CONTEXT_PLATFORM,\r\n                                 (cl_context_properties)platform(),\r\n                                 0};\r\n#else /* OS_WIN */\r\n  cl_context_properties cps[] = {CL_GL_CONTEXT_KHR,\r\n                                 (cl_context_properties)wnd.context(),\r\n                                 CL_WGL_HDC_KHR,\r\n                                 (cl_context_properties)wnd.display(),\r\n                                 CL_CONTEXT_PLATFORM,\r\n                                 (cl_context_properties)platform(),\r\n                                 0};\r\n#endif\r\n  return cl::Context(device, cps);\r\n}\r\n\r\ncl::Context createCLGLContext(const forge::Window \u0026wnd) {\r\n  std::vector\u003ccl::Platform\u003e platforms;\r\n  std::vector\u003cDevice\u003e devices;\r\n  get_devices(wnd, platforms, devices);\r\n  for (size_t i = devices.size() - 1; i \u003e= 0; i--) {\r\n    // for (size_t i = 0; i \u003c devices.size(); i++) {\r\n    try {\r\n      return createCLGLContext(wnd, platforms[i], devices[i]);\r\n\r\n    } catch (const cl::Error \u0026err) {\r\n      std::cout \u003c\u003c \"[createCLGLContext]Error:\" \u003c\u003c err.err() \u003c\u003c std::endl;\r\n    }\r\n  }\r\n  return cl::Context();\r\n}\r\n```","author":{"url":"https://github.com/3togo","@type":"Person","name":"3togo"},"datePublished":"2023-04-20T03:33:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/242/forge/issues/242"}