Linked by Thom Holwerda on Sun 7th Aug 2005 12:25 UTC, submitted by Valerie
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. This means that OpenGL performance will be significantly reduced - perhaps as much as 50%. It would be technically straightforward to provide an OpenGL ICD within the full Aeroglass experience without compromising the stability or the security of the operating system. Layering OpenGL over Direct3D is a policy more than a technical decision.
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meant to add lack of gl crossbar in d3d7 and on, to the list. But since shaders are now a norm the texture stages/crossbar are not that important unless targeting gf 1/2 hw which is about dead now.