/* glui.h Nate Robins, 1997. OpenGL based user interface. */ int gluiHorizontalSlider(int parent, int x, int y, int width, int height, float percent, void (*update)(float)); int gluiVerticalSlider(int parent, int x, int y, int width, int height, float percent, void (*update)(float)); void gluiReshape(int width, int height);