Microsoft"s current plan for OpenGL on Windows Vista is to layer OpenGL over Direct3D in order to use OpenGL with a composited desktop to obtain the Aeroglass experience. If an OpenGL ICD is run - the desktop compositor will switch off - significantly degrading the user experience. In practice this means for OpenGL under Aeroglass:
- OpenGL performance will be significantly reduced - perhaps as much as 50%
- OpenGL on Windows will be fixed at a vanilla version of OpenGL 1.4
- No extensions will be possible to expose future hardware innovations