I'm having some problems, each time i do the maths for each pixel (500x500) the cpu gonna very loaded doing the maths slowing the music...
then i tryied to use gl shader language, but i'm with some dificults because i'm new in shader and pd and GEM.... so i dont know where i can write the codes before render (init() codes)...

i tried write:
shader1 = new Glsl("hello.vert", "hello.frag");
at the construction method, because normaly is writen at main, but then the object in pd is cannot be created...

well maybe is a very confused post but if you can help me to do these render's maths in shader at this external it will be great...

these are the commands i use to compile the project:

gcc -c fractal.cpp -o fractal.o
ld -export-dynamic -shared -o teste.pd_linux fractal.o -lc -lm
and
sudo mv teste.pd_linux /usr/lib/pd-extended/extra/

thx if anyone can help...

Hello,

If you compile C++ for Pd you must make sure the setup method is defined extern "C", otherwise Pd can not find the symbol (it's searching for a C symbol).

It is also recommended to control the visibility of symbols by using compiler options. I have documented my struggle with porting a C++ lib for Pd here:

http://www.katjaas.nl/pitchshift/soundtouch~.html

Katja