Re: ColorOffset: Example usage.

[Mike M. <che...@ya...>]

--- Michel Dänzer <mi...@da...> wrote:
> On Wed, 2004-05-26 at 12:34, Mike Mestnik wrote: 
> > Attached is a screen shoot of the effect of adding 1024 to the
> > ColorOffset.  
> 
> It's hard for me to recognize anything; can you describe your
> observations?
> 
The data was shifted to the right, making it offcenter.  I will need to
find a way of undoing/compinsating-for this inorder to make changing this
offset usefull.

> > I still have to find where rmesa->state.color.drawOffset comes from
> and 
> > what effect the first 4 bits(define RADEON_COLOROFFSET_MASK
> >      0xfffffff0) are for
> 
> The 128 bit alignment.
> 
The value is in 8bit bytes then? not pixels.  What kind of conversion will
I have todo, 24bpp = 4 bytes right?

I also have to pick where the cutoff will be, since I have to make an
allignment it'l have to be much less then 2048, like from 1024 to 2000 or
2032 at the most.

> > (Why "& RADEON_COLOROFFSET_MASK" was missing from _lock.c and
> _ioctl.c).
> 
> I guess the offset is assumed to be aligned there. The hardware will
> probably ignore the lower bits anyway.
> 
Just the same I'm going to correct this in my patches then.

> 
> -- 
> Earthling Michel Dänzer      |     Debian (powerpc), X and DRI
> developer
> Libre software enthusiast    |   http://svcs.affero.net/rm.php?r=daenzer
> 



	
		
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