GLA: GL Alteration library

Presentation

GLA is an OpenGL hack, a library that traps calls to the standart OpenGL library. The goal of this project is to provide render alteration (modification), some quick and useful functions, and some things to debug your OpenGL application easely.
Licence: GPL

Implemented functionnalities

menus
FPS displaying
Setting render mode (textured, point or wireframes)
Fog with personnalisable options (color, density, start and end)
Rain and snow
Geometrical deformations on x, y, or z: sinus, cosine, tangent, random, squared, and scaling
Video recording (and streaming with ffmpeg)

Screenshots

glxgears before effect	wireframes

Simple sinus effect	Sinus with scaling

sin+scaling+random+fog	squared+cos+scaling+random+blue fog

nehe tutorial	black fog

true fog	wireframes

rain	snow

Installation

Download sources and uncompress it (tar xvzf <file>)
cd to glhack
type ./configure && make (warning are not importants)

Short Manual

Then you can test it :

With the glxgears example: cd src; ./test
With any OpenGL application

To run it with your application :
export GLA_DEFORM_EFFECTS="..." (see bellow)
LD_PRELOAD=/path/gla/sources/src/libGLa.so <command>
After, press the key 'F10' to display the menu, press 'F10' again to exit it.
In the menu the characters in uppercase specifies the key to access to this menu. To type a number, don't use numpad.
GLA_DEFORM_EFFECTS syntax :
x=,y=,z= :

sin
cos
tan
sqrt
rand
scale=<factor>

The factor can be any float more than 0.
You can combine the effect and separe it by the symbol '|'. Composants (x, y, z) are separated by commas.
Example : export GLA_DEFORM_EFFECTS="x=sin|rand,y=scale=0.5,z=scale=3|rand"

Presentation

Implemented functionnalities

Screenshots

Videos

Download sources

Download Project Report

Installation

Short Manual