[GEM-dev] motion blur

[Erich Berger]

> Perhaps 2048 hits a limit on your hardware and it falls back to software.
> You don't need to scale up to a power of two for the capture though since
> pix_snap2tex uses subtexturing or rectangle textures when available.  Even
> at powers of two the 2048x768 is 2048x1024 which is the exact same number of
> pixels as the two 1024x1024.

yes i know that it would do that, but i did not get the motionblur effect
when not using power of 2 snaps sizes and it also needs to be textured on 
a square.

one effect is also that the closer the alpha is to 1 the more the blur 
starts to behave like running ink.

the "real" effect i only achieved with square gemwins, pw2 snap sizes and
fullscreen squares.

some tests for 1600*600 you can see at
randomseed.org/view/bunt/
they are rendered with a alpha 1 - which gives this inky effect.
in a patch where everything has square dimension this would look
very different - like single buffering.
it looks quite funky - but is not intended :-) .

if one takes the alpha lower the motion blur works really well though.

best

erich