|Microsoft DirectX 9.0|
Copies the render target data from device memory to system memory.
IDirect3DSurface9* pRenderTarget, IDirect3DSurface9* pDestSurface );
If the method succeeds, the return value is D3D_OK.
D3DERR_INVALIDCALL if one of the arguments is invalid.
The destination surface must be either an off-screen plain surface or a level of a texture (mipmap or cube texture) created with D3DPOOL_SYSTEMMEM.
The source surface must be a regular render target or a level of a render target texture (mipmap or cube texture) created with POOL_DEFAULT.
This method will fail if:
- The render target is multisampled.
- The source render target is a different size than the destination surface.
- The source render target and destination surface formats do not match.