Hello! I've been working on a mod for a bit, and was attempting to use Minecraft's shader system (net.minecraft.shader), but this is seemingly impossible without editing the game's source code. I'm hoping someone over on the Forge team would be willing to put together a hook so that you can access this system (add new shaders for spectating new mobs, add new shaders for super secret settings, etc.). Currently, nothing is possible using these classes, but it looks as if it would only be a few simple changes that would allow this to work.