Well, VMWare Fusion supports OpenGL, if that is the issue. X-Plane runs under it IIRC.
VMware Fusion 7 has 3D accelerated graphics support, allowing you to play most games that require DirectX 9.0c with Shader Model 3 or OpenGL 2.1 in Windows XP Service Pack 3, Windows Vista, Windows 7 and Windows 8 virtual machines.