special class C++ for glut Please dont touch GLWindow class only extend him You must implement the following methods virtual void resize(int w, int h) = 0; virtual void initGL(void){}; virtual void createsubwindows(void) = 0; virtual void render(void){}; virtual void keyboard(unsigned char key, int x, int y){}; virtual void mouse(int button, int state, int x, int y){}; virtual void motion(int x, int y) = 0; virtual void passmotion(int x, int y) = 0; virtual void idlefunc(void) = 0; In main class in any situation dont touch all private methods. This special methods needs for abuse C - like pointers for class methods. Exmaple for use this class implemented in test.hpp and test.hpp;