Locks a rectangle on a texture resource.
HRESULT LockRect( UINT Level, D3DLOCKED_RECT *pLockedRect, const RECT *pRect, DWORD Flags );
Specifies the level of the texture resource to lock.
Pointer to a D3DLOCKED_RECT structure, describing the locked region.
Type: const RECT*
Pointer to a rectangle to lock. Specified by a pointer to a RECT structure. Specifying NULL for this parameter expands the dirty region to cover the entire texture.
Combination of zero or more locking flags that describe the type of lock to perform. For this method, the valid flags are:
If the method succeeds, the return value is D3D_OK. If the method fails, the return value can be D3DERR_INVALIDCALL.
Textures created with D3DPOOL_DEFAULT are not lockable. Textures created in video memory are lockable when created with USAGE_DYNAMIC.
For performance reasons, dirty regions are recorded only for level zero of a texture. Dirty regions are automatically recorded when IDirect3DTexture9::LockRect is called without D3DLOCK_NO_DIRTY_UPDATE or D3DLOCK_READONLY. See IDirect3DDevice9::UpdateTexture for more information.
The only lockable format for a depth-stencil texture is D3DLOCK_D16_LOCKABLE.
Video memory textures cannot be locked, but must be modified by calling IDirect3DDevice9::UpdateSurface or IDirect3DDevice9::UpdateTexture. There are exceptions for some proprietary driver pixel formats that Direct3D 9 does not recognize. These can be locked.
This method cannot retrieve data from a texture resource created with D3DUSAGE_RENDERTARGET because such a texture must be assigned to D3DPOOL_DEFAULT memory and is therefore not lockable. In this case, use instead IDirect3DDevice9::GetRenderTargetData to copy texture data from device memory to system memory.
|Header||d3d9helper.h (include D3D9.h)|