/* 
   a program to render a grid 
   Laura Toma
*/

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif


#include "grid.h"


//this is the global grid 
Grid g; 

GLfloat red[3] = {1.0, 0.0, 0.0};
GLfloat green[3] = {0.0, 1.0, 0.0};
GLfloat blue[3] = {0.0, 0.0, 1.0};
GLfloat black[3] = {0.0, 0.0, 0.0};
GLfloat white[3] = {1.0, 1.0, 1.0};
GLfloat gray[3] = {0.5, 0.5, 0.5};
GLfloat yellow[3] = {1.0, 1.0, 0.0};
GLfloat magenta[3] = {1.0, 0.0, 1.0};
GLfloat cyan[3] = {0.0, 1.0, 1.0};

/* forward declarations of functions */
void display(void);
void keypress(unsigned char key, int x, int y);

int main(int argc, char** argv) {
  
  if (argc!= 2) {
    printf("usage: %s <grid.asc>\n", argv[0]);
    exit(1);
  }

  readGridFromFile(argv[1], &g);
  printGrid(g); 

  /* open a window */
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
  glutInitWindowSize(500, 500);
  glutInitWindowPosition(100,100);
  glutCreateWindow(argv[0]);
  
  /* OpenGL init */
  glClearColor(0, 0, 0, 0);   /* set background color black*/
  
  /* callback functions */
  glutDisplayFunc(display); 
  glutKeyboardFunc(keypress);

  /* event handler */
  glutMainLoop();


 return 0;
}

void draw_grid() {


}

void display(void) {

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  draw_grid();

  /* execute the drawing commands */
  glFlush();
}

void keypress(unsigned char key, int x, int y) {
  switch(key) {
  case 'q':
    exit(0);
    break;
  } 
}