If you are doing mobile development, OpenGL ES 3.0 for the iPhone likely will not be available until iOS 7 next fall, possibly later (Apple didn't support OpenGL ES 2.0 until 2 years after it was released in 2007). If you do not have an OpenGL 4.3 compatible graphics card, you could artificially restrict yourself to the OpenGL 3.3 core API to get an idea of what OpenGL ES 3.0 programming would be like. The Adreno 3.0 SDK for Windows and the Mali Developer SDK for Windows include an OpenGL ES 3.0 emulator. If you have a graphics card that supports OpenGL 4.3 (NVIDIA has released OpenGL 4.3 beta drivers), you can use an OpenGL ES 3.0 emulator. So, how would I learn it, when the specification was just ratified fairly recently, read the specification? OpenGL ES 2.0 is a good starting point because it is forward compatible with OpenGL ES 3.0, meaning the applications you develop for OpenGL ES 2.0 will work (with minor modifications in the vertex and fragment shading code) on OpenGL ES 3.0, as well as desktop OpenGL 2.1, OpenGL 3.x and OpenGL 4.x. Seeing as OpenGL ES 3.0 spec was just released, I thought, 'Why would I learn ES 2 when I can just learn the fully PC-compatible ES 3?'
