[GEM-dev] motion blur

[B. Bogart]

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