IDirect3DVolumeTexture9::LockBox method

Locks a box on a volume texture resource.

Syntax


HRESULT LockBox(
  [in]        UINT          Level,
  [out]       D3DLOCKED_BOX *pLockedVolume,
  [in]  const D3DBOX        *pBox,
  [in]        DWORD         Flags
);

Parameters

Level [in]

Type: UINT

Specifies the level of the volume texture resource to lock.

pLockedVolume [out]

Type: D3DLOCKED_BOX*

Pointer to a D3DLOCKED_BOX structure, describing the locked region.

pBox [in]

Type: const D3DBOX*

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]

Type: DWORD

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 value

Type: HRESULT

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 LockBox is called without D3DLOCK_NO_DIRTY_UPDATE or D3DLOCK_READONLY. For more information, see UpdateTexture.

Requirements

Header

D3D9.h

Library

D3D9.lib

See also

IDirect3DVolumeTexture9
UnlockBox

 

 

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