[GEM-dev] motion blur

[Erich Berger]

hi,

the work around also does not work for me (even with nvidia). as soon as 
one starts to work with higher resolutions and non square gemwins it 
becomes slow and tricky.

according to a post of daniel heckenberg he started to work on something
relating this issue but daniel is not with us anymore i guess.
(it was actually a mail to you ben:

he implemented a clearmask message to gemwin but i have no idea
how to use it:
http://lists.puredata.info/pipermail/gem-dev/2003-09/000138.html

best

erich


---------------------
http://randomseed.org

On Thu, 17 Aug 2006, B. Bogart wrote:

> Hey Frank,
>
> the pix_snap2tex copies the buffer to a texture on the card, so I guess
> those operations are not so fast on your matrox.. ?
>
> This is a real "workaround" if I ever heard of one, since your doing a
> lot of effort since we can't seem to control clearing of the window to a
> degree. I thought someone posted a patch using wrappers to do this, but
> now I'm not sure if it was successful.
>
> back to "color 0 0 0 0.5" feature request. ;) or "clear" , "clear 0.5"
> etc...
>
> Note that using pix_snap (which transfers to main memory not gfx card
> memory) I was able to do double the resolution on linux as I could in
> windows. This is back in the days when I still has windows installed.
>
> .b.
>
>
> Frank Barknecht wrote:
>> Hallo,
>> IOhannes m zmoelnig hat gesagt: // IOhannes m zmoelnig wrote:
>>
>>
>>> the simplest method for doing fullscreen motion blur, is currently
>>> torender the entire screen (additionally) into a texture and display
>>> this texture with an alpha<1.0
>>
>>
>> As this came up again: This approach for some reason is incredibly
>> slow on both my stationary machine and my laptop. Now both my machines
>> don't have current NVidia or ATi cards, as I'm an open source driver
>> zealot.
>>
>> My main box still runs an Matrox G450 DH with 16MB, my laptop has a
>> rather recent Intel GMA 900 inside (like several new Mac-laptops), and
>> I can play Quake 2 on both boxes with very good framerates, if I'd
>> want to.
>>
>> Why is it, that this simple patch, that IOhannes attached, still makes
>> my machines max out with 100% CPU usage, and more importantly: Is
>> there a way to get better performance? Somehow I cannot believe that
>> it has to be *that* slow.
>>
>> (This is on Linux, Gem is some rather current CVS, but it happened
>> with older Gems as well)
>>
>> Ciao
>
>
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