Windows Rendering Context Code Sample

The following code sample shows how the GLX rendering context code in the previous section looks when it has been ported to Windows.


HGLRC hRC;           // rendering context variable  
 
/* Create and initialize a window */ 
        
/* Window message switch in a window procedure */ 
case WM_CREATE:      // Message when window is created  
{ 
    HDC hDC, hDCTemp;    // device context handles   
 
    /* Get the handle of the windows device context. */ 
    hDC = GetDC(hWnd); 
 
    /* Create a rendering context and make it the current context */  
    hRC = wglCreateContext(hDC); 
    if (!hRC)  
    { 
        MessageBox(NULL, "Cannot create context.", "Error", MB_OK); 
        return FALSE; 
    }  
    wglMakeCurrent(hDC, hRC); 
} 
break; 
        
        .    
case WM_DESTROYED:   // Message when window is destroyed  
{ 
    HGLRC hRC        // rendering context handle  
    HDC   hDC;       // device context handle  
 
    /* Release and free the device context and rendering context. */ 
    hDC = wglGetCurrentDC; 
    hRC = wglGetCurrentContext; 
 
    wglMakeCurrent(NULL, NULL); 
 
    if (hRC) 
        wglDeleteContext(hRC); 
 
    if (hDC) 
        ReleaseDC(hWnd, hDC); 
 
    PostQuitMessage (0); 
} 
break;

 

 

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