BOOL DDOffscreenBufferTest	(	HWND	hWnd,
		BOOL	Fullscreen
	)
Definition at line 202 of file ddtest.c.
Referenced by StartDDTest().
                                                      {
    UINT_PTR TimerID, TimerIDUpdate;
    LPDIRECTDRAW lpDD;
    LPDIRECTDRAWSURFACE lpDDPrimarySurface;
    LPDIRECTDRAWSURFACE lpDDBackBuffer;
    DDSURFACEDESC DDSurfaceDesc;
    DDSURFACEDESC DDBBSurfaceDesc;
    DDSCAPS DDSCaps;
    MSG msg;
    RECT rectDD;
    POINT wndPoint;
    INT posX = 0, posY = 10, xGain = DD_SQUARE_STEP, yGain = DD_SQUARE_STEP;

    if(DirectDrawCreate(NULL, &lpDD, NULL) != DD_OK)
        return FALSE;

    ZeroMemory(&DDSurfaceDesc, sizeof(DDSurfaceDesc));
    DDSurfaceDesc.dwSize = sizeof(DDSurfaceDesc);

    if(Fullscreen)
    {
        if(lpDD->lpVtbl->SetCooperativeLevel(lpDD, hWnd, DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN) != DD_OK)
        {
            lpDD->lpVtbl->Release(lpDD);
            return FALSE;
        }
        if(lpDD->lpVtbl->SetDisplayMode(lpDD, WIDTH, HEIGHT, 32) != DD_OK)
        {
            lpDD->lpVtbl->Release(lpDD);
            return FALSE;
        }
        DDSurfaceDesc.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;
        DDSurfaceDesc.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE  | DDSCAPS_FLIP | DDSCAPS_COMPLEX;
        DDSurfaceDesc.dwBackBufferCount = 1;
    }
    else
    {
        if(lpDD->lpVtbl->SetCooperativeLevel(lpDD, hWnd, DDSCL_NORMAL) != DD_OK)
        {
            lpDD->lpVtbl->Release(lpDD);
            return FALSE;
        }
        DDSurfaceDesc.dwFlags = DDSD_CAPS;
        DDSurfaceDesc.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
    }


    if(lpDD->lpVtbl->CreateSurface(lpDD, &DDSurfaceDesc, &lpDDPrimarySurface, NULL) != DD_OK)
    {
        lpDD->lpVtbl->Release(lpDD);
        return FALSE;
    }

    if(Fullscreen)
    {
        DDSCaps.dwCaps = DDSCAPS_BACKBUFFER;
        if (lpDDPrimarySurface->lpVtbl->GetAttachedSurface(lpDDPrimarySurface, &DDSCaps,&lpDDBackBuffer) != DD_OK)
        {
            lpDDPrimarySurface->lpVtbl->Release(lpDDPrimarySurface);
            lpDD->lpVtbl->Release(lpDD);
            return FALSE;
        }
    }
    else
    {
        /* create our offscreen back buffer */
        ZeroMemory(&DDBBSurfaceDesc,sizeof(DDBBSurfaceDesc));
        DDBBSurfaceDesc.dwSize = sizeof(DDBBSurfaceDesc);
        DDBBSurfaceDesc.dwFlags = DDSD_CAPS | DDSD_WIDTH | DDSD_HEIGHT;
        DDBBSurfaceDesc.dwHeight = HEIGHT;
        DDBBSurfaceDesc.dwWidth = WIDTH;
        DDBBSurfaceDesc.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;

        if(lpDD->lpVtbl->CreateSurface(lpDD, &DDBBSurfaceDesc, &lpDDBackBuffer, NULL) != DD_OK)
        {
            lpDD->lpVtbl->Release(lpDD);
            lpDDPrimarySurface->lpVtbl->Release(lpDDPrimarySurface);
            return FALSE;
        }
        wndPoint.x = 0;
        wndPoint.y = 0;
        ClientToScreen(hWnd, &wndPoint);
        GetClientRect(hWnd, &rectDD);
        OffsetRect(&rectDD, wndPoint.x, wndPoint.y);
    }

    /* set our timers, TimerID - for test timeout, TimerIDUpdate - for frame updating */
    TimerID = SetTimer(hWnd, -1, (UINT)TEST_DURATION, NULL);
    TimerIDUpdate = SetTimer(hWnd, 2, (UINT)10, NULL);
    (void)TimerIDUpdate;

    while (TRUE)
    {
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            if (msg.message == WM_TIMER)
            {
                if(msg.wParam == TimerID) 
                {
                    break;
                }
                else
                {
                    DDUpdateFrame(lpDDPrimarySurface,lpDDBackBuffer, Fullscreen,&posX, &posY, &xGain, &yGain, &rectDD);
                }
            }
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    lpDDPrimarySurface->lpVtbl->Release(lpDDPrimarySurface);
    /* backbuffer is released automatically when in fullscreen */
    if(!Fullscreen)
        lpDDBackBuffer->lpVtbl->Release(lpDDBackBuffer);
    lpDD->lpVtbl->Release(lpDD);

return TRUE;
}
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