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}

DDRAW_INIT_STRUCT(ddsd);

lpddsback->Lock(NULL,&ddsd, DDLOCK_SURFACEMEMORYPTR | DDLOCK_WAIT,NULL);

UCHAR *back_buffer = (UCHAR *)ddsd.lpSurface;

if (ddsd.lPitch == SCREEN_WIDTH)

memset(back_buffer,0,SCREEN_WIDTH*SCREEN_HEIGHT);

else

{

UCHAR *dest_ptr = back_buffer;

for (int y=0; y

{

memset(dest_ptr,0,SCREEN_WIDTH);

dest_ptr+=ddsd.lPitch;

}

}

for (int index=0; index

{

tempx   = (int)position[index].x;

tempy   = (int)position[index].y;

back_buffer[tempx+tempy*ddsd.lPitch] = col;

}

if (FAILED(lpddsback->Unlock(NULL)))

return(0);

if (FAILED(lpddsprimary->Flip(NULL, DDFLIP_WAIT)));

Sleep(60);

return(1);

}

int Game_Shutdown(void *parms = NULL, int num_parms = 0)

{

if (lpddpal)

{

lpddpal->Release();

lpddpal = NULL;

}

if (lpddsback)

{

lpddsback->Release();

lpddsback = NULL;

}

if (lpddsprimary)

{

lpddsprimary->Release();

lpddsprimary = NULL;

}

if (lpdd)

{

lpdd->Release();

lpdd = NULL;

}

return(1);

}

int WINAPI WinMain(HINSTANCE hinstance,

HINSTANCE hprevinstance,

LPSTR lpcmdline,

int ncmdshow)

{

WNDCLASSEX winclass;

HWND   hwnd;

MSG   msg;

HDC        hdc;

winclass.cbSize         = sizeof(WNDCLASSEX);

winclass.style= CS_DBLCLKS | CS_OWNDC |

CS_HREDRAW | CS_VREDRAW;

winclass.lpfnWndProc= WindowProc;

winclass.cbClsExtra= 0;

winclass.cbWndExtra= 0;

winclass.hInstance= hinstance;

winclass.hIcon= LoadIcon(NULL, IDI_APPLICATION);

winclass.hCursor= LoadCursor(NULL, IDC_ARROW);

winclass.hbrBackground= (HBRUSH)GetStockObject(BLACK_BRUSH);

winclass.lpszMenuName= NULL;

winclass.lpszClassName= WINDOW_CLASS_NAME;

winclass.hIconSm        = LoadIcon(NULL, IDI_APPLICATION);

if (!RegisterClassEx(&winclass))

return(0);

if (!(hwnd = CreateWindowEx(NULL,

WINDOW_CLASS_NAME,

"DirectDraw Page Flipping Demo",

WS_POPUP | WS_VISIBLE,

0,0,

SCREEN_WIDTH,SCREEN_HEIGHT,

NULL,

NULL,

hinstance,

NULL)))

return(0);

main_window_handle = hwnd;

Game_Init();

while(TRUE)

{

if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))

{

if (msg.message == WM_QUIT)

break;

TranslateMessage(&msg);

DispatchMessage(&msg);

}

Game_Main();

}

Game_Shutdown();

return(msg.wParam);

}