/*
 * GLUT Shapes Demo
 *
 * Written by Nigel Stewart November 2003
 *
 * This program is test harness for the sphere, cone
 * and torus shapes in GLUT.
 *
 * Spinning wireframe and smooth shaded shapes are
 * displayed until the ESC or q key is pressed.  The
 * number of geometry stacks and slices can be adjusted
 * using the + and - keys.
 */

#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include <stdlib.h>

float counter = 0.0;
void square(float r, float g, float b){
    glColor3f(r, g, b);
    glBegin(GL_TRIANGLE_FAN);
        glVertex3f(-0.5, -0.5, 0.5);
        glVertex3f(0.5, -0.5, 0.5);
        glVertex3f(0.5, 0.5, 0.5);
        glVertex3f(-0.5, 0.5, 0.5);
    glEnd();
}
void cube(float size){
    glPushMatrix();
    glScalef(size, size, size);

    square(1, 0, 0);

    glPushMatrix();
    glRotatef(90, 0, 1, 0);
    square(0, 1, 0);
    glPopMatrix();

    glPushMatrix();
    glRotatef(-90, 1, 0, 0);
    square(0, 0, 1);
    glPopMatrix();

    glPushMatrix();
    glRotatef(180, 0, 1, 0);
    square(0, 1, 1);
    glPopMatrix();

}
void circle(){


}

void display (){
    glClear(GL_COLOR_BUFFER_BIT); //restart clear color
glLoadIdentity();
    glPushMatrix();
    glTranslatef(0.5, 0.5, 0.0);
    circle();
    glPopMatrix();

    glRotatef(counter, 1.0, 1.0, 1.0);
    counter += 0.01;
    cube(0.5);

    glutSwapBuffers(); //interchange memory buffers
}

void reshape(int width, int high){
    glViewport(0,0,width,high); //define where to draw the object
}

void initOpenGL(){
    glClearColor(1.0, 0.0, 0.0, 1.0); //background color RGB black
}


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

    glutInit(&argc, argv);// initialize GLUT
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH); 			//double buffer, color RGB + alpha channel, & use depth for 3D
    glutInitWindowSize(500, 500); //windows size
    glutCreateWindow("Transformations"); //windows name

    glutDisplayFunc(display);
    glutIdleFunc(display);
    glutReshapeFunc(reshape);

    initOpenGL();

    glutMainLoop();//activate infinite loop

    return 0;
}