// In glut we are given a group of different 3D shapes to play with
// one of them is the cube, it can be drawn with the line:
// glutWireCube(2);
// or:
// glutSolidCube(2);
// the 2 is the length of the sides, as it is a cube, all sides are the same.
// some other 3D shapes to play with are the:
// for these 3, the more slices and stacks, the smoother the surface.
// glutSolidCone (base length, height, slices, stacks);
// glutSolidSphere (radius, slices, stacks);
// glutSolidTorus (inner radius, outter radius, slices, stacks);
// alternatively there is also the Wire version which is done by replacing 
// the Solid with Wire.
// there is also a little teapot when playing with different effects, so that
// you can see how it would change a more 'modelled' shape

// glutSolidTeapot(size);
#include <GL/gl.h>
#include <GL/glut.h>

void cube (void) {
	glColor3f(1.0, 0.0, 0.0); //color the cube red
	glutWireCube(2); //draw a wired cube with side lengths of 2
}

void display (void) {
	glClearColor (0.0,0.0,0.0,1.0);
    glClear (GL_COLOR_BUFFER_BIT);
    glLoadIdentity();  
    gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
	cube();
	glFlush();
}

void reshape (int w, int h) {
	glViewport (0, 0, (GLsizei)w, (GLsizei)h);
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity ();
	gluPerspective (60, (GLfloat)w / (GLfloat)h, 1.0, 100.0);
	glMatrixMode (GL_MODELVIEW);
}

int main (int argc, char **argv) {
    glutInit (&argc, argv);
	glutInitDisplayMode (GLUT_SINGLE);
	glutInitWindowSize (500, 500);
	glutInitWindowPosition (100, 100);
    glutCreateWindow ("A basic OpenGL Window");
    glutDisplayFunc (display);
	glutReshapeFunc (reshape);
    glutMainLoop ();
    return 0;
}