[W32API/OpenGL] How do you make a fullscreen opengl window?

This is a discussion on [W32API/OpenGL] How do you make a fullscreen opengl window? within the Game Programming forums, part of the General Programming Boards category; I'm using windows api to create a fullscreen window, but this code just changes my screen resolution but fails to ...

  1. #1
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    [W32API/OpenGL] How do you make a fullscreen opengl window?

    I'm using windows api to create a fullscreen window, but this code just changes my screen resolution but fails to create the window:

    (it's 99% example code so don't blame me for the ugly mess, I'm gonna clean it up when I get it working)

    Code:
    #include <windows.h>
    #include <gl/gl.h>
    
    #define WIDTH 1024
    #define HEIGHT 768
    
    LRESULT CALLBACK WndProc (HWND hWnd, UINT message,
    WPARAM wParam, LPARAM lParam);
    void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC);
    void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC);
    
    int WINAPI WinMain (HINSTANCE inst, HINSTANCE pinst, char *cmd, int cs)
    {
        WNDCLASS wc;
        HWND hwnd;
        HDC hdc;
        HGLRC hrc;        
        MSG msg;
        DEVMODE dmScreenSettings;
    
    
        // register window class 
        wc.style = CS_OWNDC;
        wc.lpfnWndProc = WndProc;
        wc.cbClsExtra = 0;
        wc.cbWndExtra = 0;
        wc.hInstance = inst;
        wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
        wc.hCursor = LoadCursor(NULL, IDC_ARROW);
        wc.hbrBackground = NULL;
        wc.lpszMenuName = NULL;
        wc.lpszClassName = "GLSample";
        RegisterClass (&wc);
    
        // create main window
        hwnd = CreateWindowEx(WS_EX_APPWINDOW, 
          "GLSample", "OpenGL Sample", 
          WS_POPUP | WS_CLIPSIBLINGS,
          0, 0, WIDTH, HEIGHT,
          NULL, NULL, inst, NULL);
          
        memset(&dmScreenSettings,0,sizeof(dmScreenSettings));			
    	dmScreenSettings.dmSize		= sizeof(dmScreenSettings);					
    	dmScreenSettings.dmPelsWidth	= WIDTH;						
    	dmScreenSettings.dmPelsHeight	= HEIGHT;					
    	dmScreenSettings.dmBitsPerPel	= 16;							
    	dmScreenSettings.dmFields	= DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;
    	
    	ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN);
        /* enable OpenGL for the window */
        EnableOpenGL(hwnd, &hdc, &hrc);
    
        /* program main loop */
        while (1)
        {
            /* check for messages */
            if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
            {
                /* handle or dispatch messages */
                if (msg.message == WM_QUIT)
                {
                    break;
                }
                else
                {
                    TranslateMessage (&msg);
                    DispatchMessage (&msg);
                }
            }
            else
            {
                /* OpenGL animation code goes here */
    
                glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
                glClear (GL_COLOR_BUFFER_BIT);
    
                glPushMatrix ();
                glRotatef (0, 0.0f, 0.0f, 1.0f);
                glBegin (GL_TRIANGLES);
                glColor3f (1.0f, 0.0f, 0.0f);   glVertex2f (0.0f, 1.0f);
                glColor3f (0.0f, 1.0f, 0.0f);   glVertex2f (0.87f, -0.5f);
                glColor3f (0.0f, 0.0f, 1.0f);   glVertex2f (-0.87f, -0.5f);
                glEnd ();
                glPopMatrix ();
    
                SwapBuffers (hdc);
    
             
                Sleep (1);
            }
        }
        
        ChangeDisplaySettings(NULL,0);	
    
        /* shutdown OpenGL */
        DisableOpenGL (hwnd, hdc, hrc);
    
        /* destroy the window explicitly */
        DestroyWindow (hwnd);
    
        return msg.wParam;
    }
    
    
    /* window procedure */
    
    LRESULT CALLBACK WndProc (HWND hWnd, UINT message,
                              WPARAM wParam, LPARAM lParam)
    {
        switch (message) {
            case WM_CREATE:
                return 0;
            case WM_CLOSE:
                PostQuitMessage (0);
                return 0;
            case WM_DESTROY:
                return 0;
            case WM_KEYDOWN:
                switch (wParam) {
                    case VK_ESCAPE: PostQuitMessage(0); return 0;
                }
                return 0;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
        }
    }
    
    
    /*******************
     * Enable OpenGL
     *
     *******************/
    
    void EnableOpenGL (HWND hWnd, HDC *hDC, HGLRC *hRC)
    {
     	PIXELFORMATDESCRIPTOR pfd;
    	int format;
    	*hDC=GetDC(hWnd);											
    
    	//Set the pixel format for the DC
    	memset(&pfd,0,sizeof(pfd));
    	pfd.nSize = sizeof(pfd);									
    	pfd.nVersion = 1;										
    	pfd.dwFlags = PFD_DRAW_TO_WINDOW|PFD_SUPPORT_OPENGL|PFD_DOUBLEBUFFER; 
    	pfd.iPixelType = PFD_TYPE_RGBA;
    	pfd.cColorBits = 24;										
    	pfd.cDepthBits = 16;							
    
    	format = ChoosePixelFormat(*hDC,&pfd);
    	SetPixelFormat(*hDC,format,&pfd);								
     
    	*hRC=wglCreateContext(*hDC);									
    	wglMakeCurrent(*hDC,*hRC);
    }
    
    
    // Disable OpenGL
    
    
    void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC)
    {
        wglMakeCurrent(NULL, NULL);
        wglDeleteContext(hRC);
        ReleaseDC(hWnd, hDC);
    }
    what's wrong with it?

  2. #2
    Crazy Fool Perspective's Avatar
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    I dont' have time to look through your code atm (and I've more or less forgot the tiny little bit of win32 api that I used to know) but I used something like this when I programmed on windows.
    win32, openGL basecode

  3. #3
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    Quote Originally Posted by Perspective
    I dont' have time to look through your code atm (and I've more or less forgot the tiny little bit of win32 api that I used to know) but I used something like this when I programmed on windows.
    win32, openGL basecode
    Looks promising, I'll look through that. Thanks.

  4. #4

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    You also may want to look into the GLUT library, it handles creating basic windows on virtually any platform.
    I'm not immature, I'm refined in the opposite direction.

  5. #5
    Crazy Fool Perspective's Avatar
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    Quote Originally Posted by BobMcGee123
    You also may want to look into the GLUT library, it handles creating basic windows on virtually any platform.
    I second that, and you could look here for some starters
    EmptyGlut

  6. #6

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    nice, way ahead of me per
    I'm not immature, I'm refined in the opposite direction.

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