'glGetTexLevelParameter' was not declared in this scope
Alright, so before anyone asks, yes I do have <gl/gl.h> included. Anyone have any idea why this one function, glGetTexLevelParameter, isn't showing up?
Because that's only the base name of the function. You need either the integer array or float array form, as in glGetTexLevelParameteriv or glGetTexLevelParameterfv.