#ifdef __APPLE__
#include "OpenGL/gl.h"
#include "OpenGL/glu.h"
#include "GLUT/glut.h"
#elif defined(_WIN32)
#include <windows.h>
#include "GL/glut.h"
#else
#include <cstdlib>
#include "GL/glut.h"
#endif

#include <stdio.h>

int main_window = 1;
int position_x = 100;
int position_y = 100;
int width = 512;
int height = 512;

void idle(void)
{
	if (glutGetWindow() != main_window)
		glutSetWindow(main_window);

	// just keep redrawing the scene over and over
	glutPostRedisplay();
}


void keyboard(unsigned char key, int x, int y)
{
	switch(key)
	{
	// quit
	case 27: 
	case 'q':
	case 'Q':
		exit(0);
		break;
    }
    glutPostRedisplay();
}

// the window has changed shapes, fix ourselves up
void reshape(int x, int y)
{
	width = x;
	height = y;
	printf("%d %d\n", x,y);
	glViewport(0,0,width,height);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0,width,0,height,-100,10000);
	glMatrixMode(GL_MODELVIEW);
    glutPostRedisplay();
}

void drawPoint(int x, int y, float r, float g, float b)
{
    //Set color
    glColor3f(r,g,b);
    
    //Set position
    glVertex3f(x,y,0);
}

void display( )
{
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	
    
    //Clear background to black 
	glClearColor(0,0,0,0);
	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    

    glBegin(GL_POINTS);
	for (int i=128; i<384; i++)
    {
        for (int j=128; j<384; j++)
        {
            //draw a white squared
            drawPoint(i,j, 1,1,1);

        }
    }
	glEnd();
glutSwapBuffers();
}

int main(int argc,	char* argv[])
{
#ifdef __APPLE__
    glutInit(&argc, argv);
#endif
	//
	// create the glut window
	//
	glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);
	glutInitWindowSize(width, height);
	glutInitWindowPosition(100,100);
	main_window = glutCreateWindow("Assignment 1");
    glPointSize(1);

	glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutReshapeFunc(reshape);
    glutIdleFunc(idle);

	glMatrixMode(GL_PROJECTION);
    glOrtho(0,width,0,height,-100,10000);
	glMatrixMode(GL_MODELVIEW);
	// give control over to glut
	glutMainLoop();
	
	return 0;
}