#include "stdafx.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <freeglut.h>

float startX = -180.0f;
float startZ = -100.0f;

float qtyX = 36;
float qtyZ = 20;

float red = 0.0f, green = 0.0f, blue = 0.0f;

void init(void)
{
    glClearColor(0.0, 0.0, 0.0, 0.0);
}

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    //glColor3f(1.0, 1.0, 1.0);
    glLoadIdentity();             /* clear the matrix */
            /* viewing transformation  */

    gluLookAt(0.0, 30.0f , 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.0);

    for (int i = 0; i <= qtyX; i = i++)
    {
        red = 0.0f;

        for (int j = 0; j <= qtyZ; j++)
        {
            if ((i+j)%2 == 0)
            {
                blue = 0.1f;
                red = 0.1f;
                green = 0.1f;
            }
            else red = green = blue = 0.0f;

            glColor3f(red, green, blue);
            glBegin(GL_QUADS);
            glVertex3f(startX + (i * 10) - 5.0f, 0.0f, startZ + (j * 10) - 5.0f);
            glVertex3f(startX + (i * 10) + 5.0f, 0.0f, startZ + (j * 10) - 5.0f);
            glVertex3f(startX + (i * 10) + 5.0f, 0.0f, startZ + (j * 10) + 5.0f);
            glVertex3f(startX + (i * 10) - 5.0f, 0.0f, startZ + (j * 10) + 5.0f);
            glEnd();
        }
    }

    //glutWireSphere(20.0f, 20.0f, 20.0f);

    glutSwapBuffers();
    glFlush();
}

void reshape(int w, int h)
{
    glViewport(0, 0, (GLsizei)w, (GLsizei)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(-64.0, 64.0, -36.0, 36.0, 10, 10000.0);

    glMatrixMode(GL_MODELVIEW);
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(1280, 720);
    glutInitWindowPosition(100, 100);
    glutCreateWindow(argv[0]);
    init();
    glutDisplayFunc(display);
    glutIdleFunc(display);
    glutReshapeFunc(reshape);
    glutMainLoop();
    return 0;
}