TheMogMiner is talking about OpenGL stuff, mainly about how the game is rendered. The game will use OpenGL shaders by default. How this leads to actual GLSL shaders is beyond me, but I think this is mainly for optimisation purposes.
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The Darkness will win one day, and light's time being the winner is nearing it's end. Because light is overrated.
IntelliJ > Eclipse because better autocomplete and inbuilt command line. Oh, and use the latest version for mods.
My heavily work in progress Minecraft Modding API and mod loader, N-API: https://github.com/Niadel/N-API
Code changes from 1.7 to 1.8 for us modders (that I found): https://gist.github.com/Niadel/2d2db8dd89de27f970a7