RE: [Plib-devel] texture repeating

[Ben W. <be...@bg...>]

> -----Original Message-----
> From: Amit Bakshi [mailto:am...@de...]
> Sent: Friday, August 25, 2000 2:32 PM
> To: pli...@li...
> Subject: Re: [Plib-devel] texture repeating
> 
> 
> > Just for fun, is there an easy way to turn off mipmap generation in
> > ssg?  Perhaps for lower end cards I could just give the 
> user a chance
> > to choose their poison ...
> > 
> > Curt.
> 
> Curt,
> 
> I was under the impression that mipmapping does in fact speed up
> the rasterization of "far away" textured objects. This is due 
> to the cache
> misses a full size texture would have when the texel/pixel 
> ration gets high.
> In fact you'll see some drivers that auto-generate mipmapped textures
> agains your will ( some NVidia drivers do/did that under Win32 ).
> 

My Impressions of this where a little different. Mipmapping is suppost to
improve rastorizing speed but I don't think for the same reason you are
talking about. Mipmapping generally uses more cache because it has several
version of the image, although usually stored in system memory and where
this speed increase is, is on the bus, Now you are transfering less data
accross the bus, and usually that is where most of the limitations come for
these days. That is why the new ATI cards have a compression algorithm for
the bus, and in 1600x1200, I have seen bench marks that have even surpased
different geforce cards.

Later Ben