/*
 *  bigPix.c
 *  Draws a 50x50 array of big pixels, for practice in low-level graphics
 */


#include<stdio.h>
#include <GL/glut.h>
#include "lowlevel.h"        /* faux framebuffer definitions */


void readInput(void);

/* dimensions - each pixel is 10x10, and the window is 50x50 pixels */
static int pixelSize=10;
static int numberOfPixels = 50;


/* Call your triangle drawing program from here; this is the 
   function which draws the contents of the framebuffer by 
   coloring pixels. */
void drawContents(void) {
  
  /* The colorPixel function: int x, int y, GLubyte r, GLubyte g, GLubyte b
     x,y = pixel address
     r,g,b = pixel color
  */
  readInput();

  colorPixel(25,25,0xFF,0x00,0x00);

}

/* Reads in the triangle vertices and colors from stdin */
void readInput(void) {
  int length = 100;
  char* line;
  int items;
  float x,y;

  line = (char*) malloc(length+1);
  while (fgets(line,length,stdin) != NULL) {
    items = sscanf(line, "%f %f \n", &x, &y);
    if (items != 2) 
      printf("Failed to read x and y \n");
    else 
      printf("x %f y %f\n",x,y);
  }
}

/* Called by glut when window is refreshed */
void display(void)

{
/* clear window */
	 glClear(GL_COLOR_BUFFER_BIT); 

/* draw current array of pixels */
	 drawBigPixelArray();

/* go ahead and draw, don't wait for more commands... */
	glFlush(); 

}

/* Called by main on initialization */
void init()
{
  int size;

        /* Sets up the camera and it's relation to screen pixels */
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
	size = numberOfPixels*pixelSize;
	glOrtho(0.0, 1.0*size, 0.0, 1.0*size, -1.0, 1.0);

	/* initialization of a 50x50 array of faux pixels */
	initBigPixelArray(numberOfPixels,numberOfPixels,pixelSize);

	/* call function that draws stuff in pixel array */
	drawContents();

}

int main(int argc, char** argv)
{

/* Open a window in upper left corner of screen */
/* Calls init(), which sets up contents. */

  glutInit(&argc,argv);
  glutInitWindowSize(numberOfPixels*pixelSize,numberOfPixels*pixelSize);
  glutCreateWindow("bigPix"); 
  glutDisplayFunc(display);
  init();

  glutMainLoop();

}