A callback function that must be implemented by a user to set a light.
HRESULT SetLight( [in] DWORD Index, [in] const D3DLight9 *pLight );
The zero-based index of the light. This is the same index in IDirect3DDevice9::SetLight.
Type: const D3DLight9*
The light object. See D3DLIGHT9.
The user-implemented method should return S_OK. If the callback fails when setting the device state, either of the following will occur:
- The effect will fail during ID3DXEffect::BeginPass.
- The dynamic effect state call (such as IDirect3DDevice9::SetLight) will fail.