On Sun, 2003-10-19 at 13:34, Felix Kühling wrote:
>
> I've been messing around with dithering in 16bpp mode. The current
> setting looks like random noise dithering that is different in every
> frame and introduces a slightly annoying flickering. I found out that
> the RADEON_SCALE_DITHER_ENABLE bit (radeon_regs.h) changes this to a
> static pattern dithering that looks the same in every frame. The name of
> the bit doesn't really suggest this meaning. Could someone with hardware
> docs confirm this please?
Here's what the docs I have say about...
ROUND_ENABLE: Enable rounding instead of dithering to reduce from 24-bit
pixels. If both dithering and rounding are disabled,
truncation will be used.
0=Disabled, 1=Enabled
SCALE_DITHER: Dither algorithm
0=X error diffusion, 1=2D dither with table lookup
DITHER_INIT: Enable resetting of the dither error (used for X error
diffusion dither) back to 0 at the start of each line
0=Use current error, 1=Reset at start of line
> Does it work the same on r100 and r200?
Seems so.
Hope this helps.
--
Earthling Michel Dänzer \ Debian (powerpc), XFree86 and DRI developer
Software libre enthusiast \ http://svcs.affero.net/rm.php?r=daenzer
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