Assignment3

I think the purpose of this assignment is to make our game engine more flexible. Since the game engine accepted only one buffer with one shader, we could only create monochrome game before, but now we can create colorful game!! And also, this change makes users easier to use. However, to be honest, I still dont understand why we have to make graphics.cpp identical. There are some functions that require for graphics in DirectX which doesnt exist in OpenGL, and, in order to make it identical, I ne...