title: Order independent transparency in legacy OpenGL
body: <p>I've been searching for resources covering order independent transparency, but they all cover modern OpenGL (3.0+), which I can accomplish, but I haven't found anything that explains how to implement any of these algorithms in legacy OpenGL. What are the extensions that perform any kind of order independent transparency in the absence of framebuffers and what's the first version of OpenGL that provides such possibilities?</p>