Re: [pm2fb] update 990110 - first public release ;)

[Sven LUTHER <luther@maxime.u-strasbg.fr>]

On Wed, Jan 20, 1999 at 03:17:26PM +0100, Geert Uytterhoeven wrote:
> On Wed, 20 Jan 1999, Sven LUTHER wrote:
> > On Wed, Jan 20, 1999 at 02:37:20PM +0100, Geert Uytterhoeven wrote:
> > > On Wed, 20 Jan 1999, Sven LUTHER wrote:
> > > > > > > Yes. The X server must not do video mode initialization, but call the frame
> > > > > > > buffer device instead.
> > > > > > 
> > > > > > what then is the stuff you initialize in the mach64 accel init stuff ?
> > > > > 
> > > > > Like you say, that's _accel_ _engine_ init stuff, not _graphics_ _engine_ init
> > > > > stuff. The graphics engine takes care of the video mode (programmed in the
> > > > > fbdev in the kernel), while the X server has to program the accel engine.
> > > > 
> > > > in the case of the permedia 2, the engine is only one long pipeline, so the graphic and
> > > > accel engine are the same ?
> > > 
> > > Are you sure about that?
> > 
> > I think yes, all units are in one pipeline, the same for 2D and 3D, and only this units are documented in
> > the TI docs, but then i guess by graphic engine you mean the one responsible for 
> > sending data to the monitor ? it is the last unit of the pipeline.
> 
> I don't have the Permedia2 docs here, but I don't see any reason why the
> graphics engine is supposed to be at the end of the pipeline. You don't change
> the graphics engine configuration when drawing data, you have to initialize the
> video mode (pixel clock, resolution, timings) only once.

i guess we are not speaking about the same things then, ... i will have to look at the docs again.

> Yes. But if you want to use the accel engine in X, you have to implement the
> reinit function. Well, that's XF68_FBDev, XF86_SVGA automagically does this :-)

One more reason to go with XF86_SVGA, isn't it ?

Friendly,

Sven LUTHER

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