Cheese Board

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <cmath>

#define white 1
#define black 0

void reshape(int w, int h)
{
    glClearColor(0.0, 0.5, 0.0, 0.0f);
    glViewport(0, 0 ,w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    float h2w= (float)h / (float) w;
    float w2h= (float)w / (float) h;

    if(w<=h)
    {
        gluOrtho2D(0.0, 80.0, 0.0, 80.0*h2w);
    }
    else
    {
        gluOrtho2D(0.0*w2h, 80.0, 0.0, 80.0);
    }
    glMatrixMode(GL_MODELVIEW);
}

//void init()
//{
//    glClearColor(0.0, 0.5, 0.0, 0.0f);
//    glMatrixMode(GL_PROJECTION);
//    glLoadIdentity();
//    gluOrtho2D(0.0, 80.0, 0.0, 80.0 );
//    glMatrixMode(GL_MODELVIEW);
//}

void drawboard()
{
    bool state = white;
    for (int i = 0; i<=80; i+=10)
    {
        for (int j = 0; j<=80; j+=10)
        {
            if (state==white)
            {
            glColor3ub(255,255,255);
            state = black;
            }
            else
            {
            glColor3ub(0,0,0);
            state = white;
            }
            glRecti(i,j, i+10,j+10);
        }
    }
}


void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glLoadIdentity();

    drawboard();

    glFlush();

}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB);

    glutInitWindowPosition(300,200);
    glutInitWindowSize(500,500);

    glutCreateWindow("Cheese Board");
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
//    init();
    glutMainLoop();

    return 0;

}