RenderSystem.setShaderColor(1.0f, 1.0f, 1.0f, 1.0f);
and
RenderSystem.setShaderTexture(0, Texture);
and to register
MenuScreens.register(containerRegistrationClass.container.get(), screenclass::new);
also mojang dont name they variables that why its a byproduct of obfuscation i would recommend you use parchment mappings to give them all names
https://github.com/ParchmentMC/Librarian/blob/dev/docs/FORGEGRADLE.md
https://parchmentmc.org
https://discord.parchmentmc.org/