#ifndef __GNOMEGR_H
#define __GNOMEGR_H

/*
 * Description:
 *   This module renders a binary bitmap 
 *   on screen using OpenGl and the GLUT libraries.
 *
 * To use this module, you should:
 *   call InitGnomeGr to initialize the system
 *   Call Render whenever you wish to update the screen.
 *
 * Linux: link with the glut and opengl libraries -lglut -lGLU -lGL
 *        Note that this works only on Linux machines in classroom
 *             004 in Schreiber.
 */

#ifdef __cplusplus
extern "C" {
#endif


#include "gnomedefs.h"

typedef void (*t_program_start)();

/*
 * initialization of the GnomeGr library
 * Input:
 *      canvas_ptr  - pointer to initialized canvas data structure
 *      start		- a function that will be called immediately after
 *				      the graphics is initialized
 */
void InitGr(
    const GnomeBitmap *canvas_ptr,
    t_program_start start);

/*
 * This routine is called after every command line in Single Step mode,
 * to draw the canvas bitmap on the screen.
 *
 * Input:
 *   canvas_ptr  - pointer to the canvas data structure
 */
void Render(const GnomeBitmap *canvas_ptr);

#ifdef __cplusplus
}
#endif

#endif /* __GNOMEGR_H */