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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);

}

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