Short:        Warp image SDL effect (with sources)
Author:       Emmanuel Marty <core@ggi-project.org>, Morphos port by Fabrizio "Lanch" Bartoloni
Uploader:     lanch tiscali it (Fabrizio Bartoloni)
Type:         demo/intro
Version:      1.1.4
Requires:     PowerSDL
Architecture: ppc-morphos

Note from porting author: i've seen this already on the SDLdemos archive
 but this time is made available with full documentation, source code
 , is linked against the latest PowerSDL and the executable is smaller.
  

Warp - Realtime picture 'gooing' SDL demo. Version 1.1.4 (apr. 14, 1998)

This program is intended to be a demonstration of SDL, the Simple
DirectMedia Layer.

Compiling the demo:

Run 'make'

Running the demo :

Once the program is compiled, just run "warp" and enjoy.

Because I wanted the program to stay small and independant of any other
dynamic library installed in the system (e.g. libjpeg, libpng..), it reads
BMP picture files. You can use The Gimp to save to that format, or you
can always implement another loader, but this will grow the code beyond
necessity. Anyway, if you have another picture, you can do :

warp picturefile.bmp

to use this picture instead of the default one (leeloo.bmp ;).

The demo runs on its own, you can exit it by pressing any key.

Background :

I wrote this program just after I had started to contribute to the GGI
project, wishing at the time to write drivers for the chips I owned and
for which I had documentation - Matrox 1164SG (Mystique, an awesome board)
and ATI 3D RAGE II (blargh). The idea was to learn more about GGI
internals and to provide the project with a good demo, which was
lacking at the time. Matthias Grimrath wrote the Mystique driver,
the ATI chips didn't motivate anyone that much yet :), and I wrote
the driver for the Cyrix MediaGX chipset, in cooperation with Cyrix
themselves, which was a really interesting project. I did the libggi
port to IRIX and I manage the ggi-project domain name aswell, now,
and I want to hope I know GGI quite well. 

This demo has been written in an evening and most of a night (not
knowing anything about GGI when I started :). I hope you will like
the result.

(Sam:
 This demo was converted to SDL in about 2 and a half hours.  Thanks!
)

This is actually a routine that I had written in 680x0 assembler
on the Amiga, never used, then ported to 80x86 assembler, then ported
to C++ under BeOS, then ported to Java (you can see the Java version
on http://www.core.netnation.org/pages/warp_anita.html), then ported to
plain C for GGI today. Every time I ported it to a new architecture,
I have optimized some bits. I still think it can be done faster, but
on a P133, and with the demo compiled with egcs as -mpentium -O6, it
runs at full frame rate.

Enjoy ;)

Emmanuel Marty <core@ggi-project.org>

web: http://www.core.netnation.org
irc: core on undernet #linux
icq: uin 1153070 (please bear with my java-linux restricted icq client :P)