/*******************************************************************
       Example Main Program for CS480 Programming Assignment 2
********************************************************************
    Author: Stan Sclaroff
            Boston University Computer Science Dept.
            October 2, 2006
********************************************************************
Description: This is a simple example program that allows the  
             user to display a hand model and change its parameters.

	     The following keys control the program:

             Q,q, <escape>: quit
             R: reset viewing angle

             Left mouse click + drag motion: rotate the hand view

             1 : toggle the first finger (thumb) active in rotation
             2 : toggle the second finger active in rotation
             3 : toggle the third finger active in rotation
             4 : toggle the fourth finger active in rotation
             5 : toggle the fifth finger active in rotation

             X : use the X axis rotation at the active joint(s)
             Y : use the Y axis rotation at the active joint(s)
             Z : use the Z axis rotation at the active joint(s)

             P : select joint that connects finger to palm 
             M : select middle joint 
             D : select last (distal) joint

             up-arrow, down-arrow: increase/decrease rotation angle


********************************************************************
Comments: This program uses the GLUT library. This library has it's
	    own event loop handler which passes control back to your
	    program's callback routines.  Links to WWW pages for GLUT
	    and OpenGL are provided on the course web page.
********************************************************************/

#include <stdlib.h>
#include <GL/glut.h>
#include "const.h"
#include "types.h"
#include "funcs.h"

void initShading();

int main(int argc, char **argv)
{
  GLint windW=DEFAULT_WINDOW_WIDTH, windH=DEFAULT_WINDOW_HEIGHT;

  glutInit(&argc, argv);

  /* display modes: 24 BIT, double buffer mode */
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
  glutInitWindowSize(windW,windH);
  glutCreateWindow("CS480/CS680: Hand Simulator");

  /*  register callbacks for window redisplay 
      and reshape event callbacks */
  glutDisplayFunc(display);
  glutReshapeFunc(reshape); 

  /* setup keyboard handler callbacks */
  glutKeyboardFunc(keyboard);
  glutSpecialFunc(special);

  /* setup mouse handler callbacks */
  glutMotionFunc(mouseMotion);
  glutMouseFunc(mouseButton);

  initShading();

  /* turn over control to GLUT */
  glutMainLoop();

  return 0;             
}

void initShading()
{
  /* set up for shaded display of the hand */
  GLfloat light0_position[] = {1,1,1,0};
  GLfloat light0_ambient_color[] = {0.25,0.25,0.25,1};
  GLfloat light0_diffuse_color[] = {1,1,1,1};

  glPolygonMode(GL_FRONT,GL_FILL);
  glEnable(GL_COLOR_MATERIAL);
  glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE);

  glClearColor(0.0,0.0,0.0,0.0);
  glShadeModel(GL_SMOOTH);
  
  /* set up the light source */
  glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
  glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient_color);
  glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_diffuse_color);

  /* turn lighting and depth buffering on */
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_NORMALIZE);
}