[GEM-dev] motion blur

[Frank Barknecht]

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
-- 
 Frank Barknecht                 _ ______footils.org_ __goto10.org__