关于Pitch...关于IDirect3DTexture9::LockRect这个函数的问题

penghao_xmu

IDirect3DTexture9:ockRect这个函数原型是:

HRESULT LockRect(
  UINT Level,
  D3DLOCKED_RECT * pLockedRect,
  CONST RECT * pRect,
  DWORD Flags
);

对于pLockedRect 的 Pitch 数据SDK  的解释是
Remarks
The pitch for DXTn formats is different from what was returned in DirectX 7. It now refers to the number of bytes in a row of blocks. For example, if you have a width of 16, then you will have a pitch of 4 blocks (4*8 for DXT1, 4*16 for DXT2-5.)

意思是不是说,如果原纹理大小是1024 * 1024,我锁住了一块512*512的pLockedRect,那么这块pLockedRect的Pitch就是 4 * 512了? 那么如果要拷贝纹理数据去其他地方,这个Pitch能用吗? 我试过一次memcpy.出现了奇怪的显示啊...

penghao_xmu

盼解