framework.h should include GL headers #45
Description
Originally reported by: Nikos Platis (Bitbucket: nplatis, GitHub: nplatis)
framework.h uses some GL types (GLenum, GLint) but does not include any GL header. It should do so in order to be self-contained.
- Bitbucket: https://bitbucket.org/alfonse/gltut/issue/76