When does the surface UnlockRect

akira32

Can I timely let surface UnlockRect after LockRect.
Is the "<==position1" surface UnlockRect postion correct? Does it have any probelm about the pointer of "lrect_New.pBits"?

1. 
   
2.         HRESULT hr;
   
3. 
   
4.         LPDIRECT3DSURFACE9 pDestSurface_New;
   
5.         D3DLOCKED_RECT lrect_New;
   
6.         D3DSURFACE_DESC Desc;
   
7. 
   
8.         m_QVSM_pShadowMapSurf_Common->GetDesc(&Desc);
   
9.         V(m_pd3dDevice->CreateOffscreenPlainSurface(Desc.Width,Desc.Height,Desc.Format,D3DPOOL_SYSTEMMEM,&pDestSurface_New,NULL));//Must be D3DPOOL_SYSTEMMEM for MSDN
   
10.         V(m_pd3dDevice->GetRenderTargetData(m_QVSM_pShadowMapSurf_Common,pDestSurface_New));
    
11. 
    
12.         hr=pDestSurface_New->LockRect(&lrect_New,NULL,D3DLOCK_NO_DIRTY_UPDATE|D3DLOCK_READONLY);
    
13.         //hr=pDestSurface_New->UnlockRect();//<==position1
    
14. 
    
15.         for (LONG y=0;y<(LONG)Desc.Height;y++)
    
16.         {
    
17.                 DWORD dwOffset = y*Desc.Width;
    
18. 
    
19.                 for (LONG x=0;x<(LONG)Desc.Width;x++)
    
20.                 {
    
21.                         //float dwColor_New = ((float*)lrect_New.pBits)[y*(lrect_New.Pitch/sizeof(float))+x];//Y*Width+X
    
22.                         float dwColor_New = ((float*)lrect_New.pBits)[y*Desc.Width+x];//Y*Width+X
    
23.                         int c=12;
    
24.                 }
    
25.         }
    
26. 
    
27.         hr=pDestSurface_New->UnlockRect();//<==position2
    
28. 
    
29.         SAFE_RELEASE(pDestSurface_New);
    

复制代码