构建基于OpenGL ES 2.0着色器的过滤器动态链的最佳方法

I'm on iOS 6 (7 too if you will and makes any difference) and GL ES 2.0. The idea is for a CAEAGLLayer to have a dynamic chain of shader-based filters that processes its contents property and displays the final result. Filters can be added / removed at any point in the chain.I'm on iOS 6 (7 too if you will and makes any d