GLSL Post-processing system

Put the farm game on the shelf for a while because uni’s back.

I spent all weekend making a easy to use post processing system for OpenGL. Basically, I am drawing my entire scene to a FBO, then drawing a fullscreen quad with the FBO as the texture to a different FBO. Then I draw that FBO as a full screen quad to another FBO, rinse and repeat until all effects have been applied. The system uses a list of effects which means you can stack shaders to combine effects.

Usage:

//Setup code
PostProcessor pp( screenW, screenH );
Shader* shader1 = new Shader();
shader1->loadVertexShader(   "file.vert" );
shader1->loadFragmentShader( "file.frag" );
shader1->compileShader();
pp.addEffect( shader1 );

//Main game loop
pp->stopRendering();
	//All scene rendering code to go here
pp->stopRendering();
//Draw the final screen
pp->drawProcessedScreen();

Easy as!

Here are some screenshots of various shaders:

3xDark edges + a bloom

No effect

Crazy effect

Wave

Blur

Wave + Blur

Horizontal find edges

Advertisement

~ by weetbix on August 17, 2009.