/*
 * This is a GLUT (OpenGL Utility Toolkit) implementation of a Go interface,
 * and is used for all the Go examples.
 *
 * The purpose of this file is to hide all the GUI (Graphical User Interface)
 * details.
 *
 * The GLUT library is available on any system capable of running OpenGL.
 */

#include <GL/glut.h>
#include "Go.h"

#define MAX_GLUT_CONTEXTS  16

class GoGlutInterface;

class GlutContext
{
  public:

    int              winID;
    GoGlutInterface  *interface;
};

class GoGlutInterface
{
  public:

    Go   *go;

    GoGlutInterface(void);

    static void init(int *argc, char *argv[]);
    static void windowName(char *name);
    static void windowSize(int width, int height);
    static void windowPosition(int x, int y);
    static void mainLoop(void);

    void swap(void);
    void rerender(void);
    virtual void render(void);
    virtual void resized(int width, int height);
    virtual void keyTyped(char key);
    virtual void mousePressed(int x, int y);
    virtual void mouseReleased(int x, int y);
    virtual void mouseDragged(int x, int y);


  private:

    static char *name;
    static int  width, height;
    static int  x, y;

    static GlutContext glutContext[MAX_GLUT_CONTEXTS];
    static int contextCount;

    static GoGlutInterface *getInterface(void);
    static void glutDisplayFunction(void);
    static void glutReshapeFunction(int width, int height);
    static void glutKeyboardFunction(unsigned char key, int xMouse, int yMouse);
    static void glutMouseFunction(int button, int state, int xMouse, int yMouse);
    static void glutMotionFunction(int xMouse, int yMouse);
};