The codes:
Chunk class: https://pastebin.com/kKrpNv6B the render method is at the bottom of the page
Shader class: https://pastebin.com/FWCMVvC5
ChunkShader class: https://pastebin.com/WJ1AxUPb
TextureManager class: https://pastebin.com/61qBnbFf
Texture class: https://pastebin.com/Sttzdg8x