Re: OpenGL-based framebuffer concepts

From: Alan Cox
Date: Tue May 23 2006 - 12:40:48 EST

On Maw, 2006-05-23 at 11:41 -0400, Kyle Moffett wrote:
> So a modern GPU is essentially a proprietary CPU with an obscure
> instruction set and lots of specialized texel hardware? Given the
> total lack of documentation from either ATI or NVidia about such
> cards I'd guess it's impossible for Linux to provide any kind of
> reasonable 3d engine for that kind of environment, and it might be
> better to target a design like the Open Graphics Project is working
> to provide.

Its typically a device you feed a series of fairly low level rendering
commands to sometimes including instructions (eg shaders). DRI provides
an interface that is chip dependant but typically looks like

[User provided command buffer]
[Kernel filtering/DMA interface]
[Card command queue processing]

All the higher level graphic work is done in the 3D client itself.

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