WglCreateContext on a Qt5 Widget?

[mkandel]

I want to use my own event loop to process OpenGL, but I still want to use Qt for buttons and most of my interface. I need this kind of precise control it greatly simplifies my code and helps with multithreading and GPU integration.

Is this possible? Why am I getting the following errors? My understanding is that I can do this with 'foreign windows' but I can't find any documentation?

@QApplication::regClass: Registering window class 'Qt5QWindowIcon' failed. (Class
already exists.)
ASSERT failure in QCoreApplication::sendEvent: "Cannot send events to objects ow
ned by a different thread. Current thread 39ca1cd590. Receiver 'qt5nativehandleC
lass' (of type 'qt5nativehandle') was created in thread 39ca15a1a0", file kernel
\qcoreapplication.cpp, line 505
QObject::setParent: Cannot set parent, new parent is in a different thread
QObject::setParent: Cannot set parent, new parent is in a different thread
ASSERT failure in QCoreApplication::sendEvent: "Cannot send events to objects ow
ned by a different thread. Current thread 39ca15a1a0. Receiver 'centralWidgetWindow' (of type 'QWidgetWindow') was created in thread 39ca1cd590", file kernel\qc
oreapplication.cpp, line 505@

The OpenGL context looks something like

@void qt5nativehandle::startTheGL()
{
//Try to get a handle
g_hWnd = (HWND)ui.wgdMessWith->winId();
qDebug() << "g_hWnd : " << g_hWnd;
g_hDC = GetDC(g_hWnd);
qDebug() << "g_hDC : " << g_hDC;
//
int pf = 0;
// GL Settings
PIXELFORMATDESCRIPTOR pfd;
memset(&pfd,0,sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 16;
pfd.cDepthBits = 8;
pfd.iLayerType = PFD_MAIN_PLANE;
OSVERSIONINFO osvi = {0};
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
GetVersionEx(&osvi);
pf = ChoosePixelFormat(g_hDC, &pfd);
SetPixelFormat(g_hDC, pf, &pfd);
if (osvi.dwMajorVersion > 6 || (osvi.dwMajorVersion == 6 && osvi.dwMinorVersion >= 0))
{
pfd.dwFlags |= PFD_SUPPORT_COMPOSITION;
}
HGLRC tempContext = wglCreateContext(g_hDC);
qDebug() << "tempContext : " << tempContext;
wglMakeCurrent(g_hDC, tempContext);
auto foo = glewInit();
if (foo != GLEW_OK)
{
qDebug() <<"Oh NO!";
}
int attribList[] =
{
WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
WGL_CONTEXT_MINOR_VERSION_ARB, 1,
WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
0, 0
};
//
g_hRC = wglCreateContextAttribsARB(g_hDC,0, attribList);
wglMakeCurrent(NULL,NULL);
wglDeleteContext(tempContext);
wglMakeCurrent(g_hDC, g_hRC);
SetWindowText(g_hWnd, L"SLM");
}@

I put a complete build-able version on bitbucket if somebody can take a closer look:

@git clone https://mkandel@bitbucket.org/mkandel/openglqtmixo.git@