mono/MonoGame — pull request #2858 by KonajuGames (2014-07-29 12:10:35+00:00)
Title: OpenGL SamplerState had null GraphicsDevice

The GraphicsDevice had never been set in the OpenGL version of SamplerState. This PR sets it and checks for the SamplerState being used on the same GraphicsDevice as it was first used, similar to the DirectX version.