Computing in OpenGL-ES glsl

Question

Hello,

I would like to off-load some computations from the CPU to the GPU of my cell-phone. Since OpenGL ES 2.x the GPU supports vertex and fragment shaders. How can I use the GPU to do some calculations.

Are there any Getting-Started tutorials?

As for now, I guess that I have to load the data in via textures render them to FBO (frame buffer objects) and retrieve the data via call to the OpenGL API.

Thank you for any advise,

Friedrich