IDirect3DVolumeTexture9::LockBox

Locks a box on a volume texture resource.

HRESULT LockBox(
  UINT Level,
  D3DLOCKED_BOX * pLockedVolume,
  CONST D3DBOX * pBox,
  DWORD Flags
);

Parameters

Level

[in] Specifies the level of the volume texture resource to lock.

pLockedVolume

[out] Pointer to a D3DLOCKED_BOX structure, describing the locked region.

pBox

[in] Pointer to the volume to lock. This parameter is specified by a pointer to a D3DBOX structure. Specifying NULL for this parameter locks the entire volume level.

Flags

[in] Combination of zero or more locking flags that describe the type of lock to perform. For this method, the valid flags are:

• D3DLOCK_DISCARD
• D3DLOCK_NO_DIRTY_UPDATE
• D3DLOCK_NOSYSLOCK
• D3DLOCK_READONLY

For a description of the flags, see D3DLOCK.

Return Values

If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be D3DERR_INVALIDCALL.

Remarks

For performance reasons, dirty regions are only recorded for level zero of a texture. Dirty regions are automatically recorded when IDirect3DVolumeTexture9::LockBox is called without D3DLOCK_NO_DIRTY_UPDATE or D3DLOCK_READONLY. For more information, see IDirect3DDevice9::UpdateTexture.

Requirements

Header: Declared in D3d9.h.

See Also

IDirect3DVolumeTexture9::UnlockBox