QtForum.org

Source code

class MyGLWidget: public QWidget
{

public:
	MyGLWidget(QWidget* parent) :
	  QWidget(parent)
	{

		setAttribute(Qt::WA_PaintOnScreen);
		setAttribute(Qt::WA_NoSystemBackground);
	}

	  QPaintEngine* paintEngine() const
	  {
		  return 0;
	  }

	void initializeGL()
	{
		HWND window = winId();
		BOGART_ASSERT(window);

		PIXELFORMATDESCRIPTOR format = {
			sizeof (PIXELFORMATDESCRIPTOR),
			1,
			PFD_DRAW_TO_WINDOW|PFD_SUPPORT_OPENGL|PFD_DOUBLEBUFFER,
			PFD_TYPE_RGBA,
			24,
			0,0,0,0,0,0, //RGB bits/shift, not used
			0,
			0,
			0,
			0,0,0,0, //accum RGBA bits, not used
			32,
			0,//stencil
			0,
			PFD_MAIN_PLANE,
			0,0,0,0//not used
		};

		HDC dc = GetDC(window);
		int pixelFormatIndex = ChoosePixelFormat(dc,&format);
		BOGART_ASSERT(pixelFormatIndex)
		BOOL success = SetPixelFormat(dc,pixelFormatIndex,&format);
		BOGART_ASSERT(success != FALSE);

		HGLRC renderContext = wglCreateContext(dc);
		BOGART_ASSERT(renderContext);

		wglMakeCurrent(dc,renderContext);
		ReleaseDC(window,dc);
	}

	bool event(QEvent* event)
	{
		switch (event->type())
		{
		case QEvent::ParentChange:
			BOGART_FAIL(); //not an issue yet
			break;
		case QEvent::Paint:
			{
				glClearColor(1.0f,1.0f,0.0f,1.0f);
				glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

				HDC dc = GetDC(winId());
				BOOL success = SwapBuffers(dc);
				BOGART_ASSERT(success != FALSE);
				ReleaseDC(winId(),dc);
			}
			return true;
		case QEvent::Resize:
			QResizeEvent* re = (QResizeEvent*)event;
			glViewport(0,0,re->size().width(),re->size().height());
			break;
		}

		return QWidget::event(event);
	}
};

INT WINAPI WinMain(HINSTANCE instance, HINSTANCE previousInstance, LPSTR commandLine, INT commandAmount)
{
	int argc = 0;
	QApplication app(argc,0);

	QMainWindow* mainWindow = new QMainWindow();
	mainWindow->showNormal();

	MyGLWidget* gl = new MyGLWidget(mainWindow);
	mainWindow->setCentralWidget(gl);

	gl->initializeGL();
	app.exec();
}