Shadertoy is one of the online tool letting you play interactively with GLSL ES shaders (and browse other’s shaders). But soon, several issues will appear: How to use Shadertoy features (are you sure to really know them ? 🙂 )→ see here. GLSL is not C, GLSL ES is not GLSL. How to program, and how to program well, on this calculus model ? → see here. As a quite unmature technology, there are many c