I am trying to figure out why if I un-comment the 2 lines marked, and comment out the gluOrtho2D line I see the sample picture, but if I leave it as is, I do not. For this project the openGL image will only EVER be a 2D image, and I need the origin to be centered at the bottom left hand corner. Yet I don't see anything. I am not used to using the pixelFormatDescriptor, do I perhaps have a value wrong? Here is the necessary part of the code... /** Resize And Initialize The GL Window */ GLvoid COpenGLWrapper::Set2DMatrix(GLsizei width, GLsizei height) { if ( height == 0 ) { // Prevent A Divide By Zero By Making Height Equal One height = 1; } glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); // Sets the (0,0) coordinates to the bottom left side of the screen - what I want! gluOrtho2D( 0, width, 0, height ); // Calculate The Aspect Ratio Of The Window // gluPerspective( 45.0f, (GLfloat)width/(GLfloat)height, 0.1f,100.0f); -- LINE 1 to uncomment glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } /** All Setup For OpenGL Goes Here */ int COpenGLWrapper::InitGL(GLvoid) { glShadeModel(GL_SMOOTH); // Enable Smooth Shading glClearColor(BACKGROUND_COLOR); // Set Background Color to stored constant glEnable(GL_DEPTH_TEST); // Enables Depth Testing glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations return TRUE; } /** Here's where we do all the drawing for this window! */ void COpenGLWrapper::Draw() { glLoadIdentity(); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); // Clear Buffer & Fill with Background Color SamplePicture(); SwapBuffers( m_hDC ); // Don't forget to swap the buffers! =) } void COpenGLWrapper::SamplePicture() { // glTranslatef( 0.0f,0.0f,-6.0f); // Move Into The Screen 6.0 Units (Z-azis) -- LINE 2 to uncomment glBegin(GL_LINE_STRIP); // Drawing Using Connected Lines glColor3f(1.0f,0.0f,0.0f); // Red glVertex2f( 0.0f, 1.0f); // Top glColor3f(1.0f,1.0f,0.0f); // Yellow glVertex2f( 0.0f, 0.0f); // Bottom Left glColor3f(1.0f,0.0f,1.0f); // Purple glVertex2f( 1.0f, 0.0f); // Bottom Right glColor3f(0.0f,1.0f,0.0f); // Green glVertex2f( 1.0f, 1.0f); // Bottom Right glEnd(); // Finished Drawing The Lines } /** Creates the Window Device Content for OpenGL and begins drawing onto it */ BOOL COpenGLWrapper::CreateWindowWrapper() { GLuint PixelFormat; // Holds The Results After Searching For A Match static PIXELFORMATDESCRIPTOR pfd= // pfd Tells Windows How We Want Things To Be { sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor 1, // Version Number PFD_DRAW_TO_WINDOW | // Enables drawing to a window or device surface PFD_DRAW_TO_BITMAP | // Enables drawing to a bitmap in memory PFD_SUPPORT_OPENGL | // Enables OpenGL calls PFD_DOUBLEBUFFER, // Must Support Double Buffering PFD_TYPE_RGBA, // Request An RGBA Format 32, // Select Our Color Depth 0, 0, 0, 0, 0, 0, // Color Bits Ignored 16, // No Alpha Buffer 0, // Shift Bit Ignored 0, // No Accumulation Buffer 0, 0, 0, 0, // Accumulation Bits Ignored 32, // 32 bit Z-Buffer (Depth Buffer) - only want window to be able to do 2D 0, // No Stencil Buffer 0, // No Auxiliary Buffer PFD_MAIN_PLANE, // Main Drawing Layer 0, // Reserved 0, 0, 0 // Layer Masks Ignored }; if( !(m_hDC) ) // Did We Get A Device Context? { DWORD error = GetLastError(); KillGLWindow(); // Reset The Display return FALSE; // Return FALSE } if( !(PixelFormat=ChoosePixelFormat( m_hDC,&pfd )) ) // Did Windows Find A Matching Pixel Format? { KillGLWindow(); // Reset The Display return FALSE; // Return FALSE } if(!SetPixelFormat( m_hDC,PixelFormat,&pfd)) // Are We Able To Set The Pixel Format? { KillGLWindow(); // Reset The Display return FALSE; // Return FALSE } if (!(m_hRC=wglCreateContext(m_hDC))) // Are We Able To Get A Rendering Context? { KillGLWindow(); // Reset The Display return FALSE; // Return FALSE } if(!wglMakeCurrent( m_hDC,m_hRC)) // Try To Activate The Rendering Context { KillGLWindow(); // Reset The Display return FALSE; // Return FALSE } // Initially display the window ProcessWindow(); // Let our timers know this window has been created, so we can start refreshing it! winCreated = true; return TRUE; } /** Necessary steps to initially display the window */ void COpenGLWrapper::ProcessWindow() { if ( !InitGL() ) // Initialize Our Newly Created GL Window { // Initialization failed! KillGLWindow(); // Reset The Display return; // Return FALSE } Set2DMatrix(width, height); Draw(); }

Actually, I did mean width and height (believe it or not I do need to do know exact pixel by pixel -- my program is a simulation of hardware screens), but thank you that helped me realize I had already fixed the real problem! Thanks!

I had presumed (obviously incorrectly) that I didn't need a depth buffer since I am only doing a 2D screen. However, with pixelFormatDescriptor, this is obviously untrue!