C / C++ / MFC

#include <windows.h><br />
#include <scrnsave.h><br />
<br />
void InitGL(HWND hWnd, HDC &hDC, HGLRC &hRC);<br />
void CloseGL(HWND hWnd, HDC hDC, HGLRC hRC);<br />
//globals used by the function below to hold the screen size<br />
int Width;	<br />
int Height;<br />
<br />
//define a Windows timer <br />
#define TIMER 1 <br />
<br />
// Screen Saver Procedure<br />
LRESULT WINAPI ScreenSaverProc(HWND hWnd, UINT message, <br />
                               WPARAM wParam, LPARAM lParam)<br />
{<br />
  static HDC hDC;<br />
  static HGLRC hRC;<br />
  static RECT rect;<br />
<br />
  switch ( message ) {<br />
<br />
  case WM_CREATE: <br />
    // get window dimensions<br />
    GetClientRect( hWnd, &rect );<br />
    Width = rect.right;		<br />
    Height = rect.bottom;<br />
    <br />
    //get configuration from registry if applicable<br />
<br />
    //set up OpenGL<br />
    InitGL( hWnd, hDC, hRC );<br />
<br />
    //Initialize perspective, viewpoint, and<br />
    //any objects you wish to animate<br />
<br />
    //create a timer that ticks every 10 milliseconds<br />
    SetTimer( hWnd, TIMER, 10, NULL ); <br />
    return 0;<br />
 <br />
  case WM_DESTROY:<br />
    KillTimer( hWnd, TIMER );<br />
    <br />
    //delete any objects created during animation<br />
    //and close down OpenGL nicely<br />
<br />
     CloseGL( hWnd, hDC, hRC );<br />
    return 0;<br />
<br />
  case WM_TIMER:<br />
    //call some function to advance your animation		<br />
    return 0;				<br />
<br />
  }<br />
<br />
  //let the screensaver library take care of any<br />
  //other messages<br />
<br />
  return DefScreenSaverProc( <br />
    hWnd, message, wParam, lParam );<br />
}<br />
<br />
static void InitGL(HWND hWnd, HDC & hDC, HGLRC & hRC)<br />
{<br />
  <br />
  PIXELFORMATDESCRIPTOR pfd;<br />
  ZeroMemory( &pfd, sizeof( pfd) );<br />
  pfd.nSize = sizeof( pfd);<br />
  pfd.nVersion = 1;<br />
  pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;<br />
  pfd.iPixelType = PFD_TYPE_RGBA;<br />
  pfd.cColorBits = 24;<br />
  <br />
  hDC = GetDC( hWnd );<br />
  <br />
  int i = ChoosePixelFormat( hDC, &pfd );  <br />
  SetPixelFormat( hDC, i, &pfd );<br />
<br />
  hRC = wglCreateContext( hDC );<br />
  wglMakeCurrent( hDC, hRC );<br />
<br />
}<br />
<br />
static void CloseGL(HWND hWnd, HDC hDC, HGLRC hRC)<br />
{<br />
  wglMakeCurrent( NULL, NULL );<br />
  wglDeleteContext( hRC );<br />
  ReleaseDC( hWnd, hDC );<br />
}<br />
<br />
BOOL WINAPI<br />
ScreenSaverConfigureDialog(HWND hDlg, UINT message, <br />
                           WPARAM wParam, LPARAM lParam)<br />
{<br />
    return FALSE;<br />
}<br />
<br />
// needed for SCRNSAVE.LIB<br />
BOOL WINAPI RegisterDialogClasses(HANDLE hInst)<br />
{<br />
  return TRUE;<br />
}