[Bf-committers] Where did OpenGL dither go?

[Ton Roosendaal]

Hi,

Yes of course that's it... 12 or 16 bits color displays had it. A decade ago!
In the SGI days, many systems did double-buffer by halving the color space to 2x12 bits, dithered too.

Nevertheless, for 24 bits "true color" it would look nicer too :)

-Ton-

--------------------------------------------------------
Ton Roosendaal  -  ton at blender.org   -   www.blender.org
Chairman Blender Foundation - Producer Blender Institute
Entrepotdok 57A  -  1018AD Amsterdam  -  The Netherlands



On 6 Jun, 2013, at 14:10, Brecht Van Lommel wrote:

> I can't find good info on it either, maybe it was only ever used for
> OpenGL color index mode or displays with less than 8 bits per color
> channel?
> 
> The dither implementation is not specified by the OpenGL
> specification, and it's valid to not do any dithering at all.
> 
> On Thu, Jun 6, 2013 at 12:58 PM, Ton Roosendaal <ton at blender.org> wrote:
>> Hi all,
>> 
>> Someone pointed me at the banding, visible in shaded 3d viewports with greyscales.
>> None of the systems I tried (mac nvidia, mac ati, linux nvidia) shows any dither in the viewport... and there's nothing in the code pointing at being disabled.
>> 
>> I checked it with a print in the graded backdrop drawing:
>> printf("dither is %d\n", glIsEnabled(GL_DITHER));
>> 
>> And it says it's on.
>> 
>> Screenie, with expanded color range to see the banding:
>> http://www.pasteall.org/pic/52953
>> 
>> Shouldn't it show a nice stipple pattern? I recall this, but more like from 10 years ago or so :)
>> 
>> Googling about it didn't give me info about this feature being dropped in drivers nowadays.
>> 
>> -Ton-
>> 
>> --------------------------------------------------------
>> Ton Roosendaal  -  ton at blender.org   -   www.blender.org
>> Chairman Blender Foundation - Producer Blender Institute
>> Entrepotdok 57A  -  1018AD Amsterdam  -  The Netherlands
>> 
>> 
>> 
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