Simple Minecraft Shaders

If you want to play with shaders in Minecraft, here's the simplest possible shader to get started with (it just inverts your screen), along with some hints on how to make your own.

I realize this readme is lacking in detail... Hit me up with questions in the Issues and I'll fill in what's missing!

Installing

You'll need Minecraft, of course, and some sort of shaders mod. I recommend Optifine, as it has a shaders mod built it. You'll need Forge installed first so you can install Optifine.

Once you have that all set up, find the shaderpacks folder in your Minecraft resources folder on your hard drive and drop the Inverter folder into it. Run Minecraft and select Inverter from Optifine's shader menu.

Coding

Take a look at Inverter/shaders/final.fsh and play around! The language you're using is called GLSL. http://thebookofshaders.com/ is a good introduction (though it's not specifically about Minecraft). After each change you make, don't forget to save. You can try it directly in Minecraft without having to restart the game, but you do have to switch to another shader and back again for the changes to take effect.

If you want to take it further, you can watch this in-depth tutorial series. You can also examine the code of more advanced shaders, such as Chocapic13's Shaders.

Thanks to TheCool1James's intro for many of the links above.