#include <GL/glut.h>
#include <math.h>

int angle=0;
float color = 0.0;

void MouseCallback(int button, int state, int x, int y) {
	if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) {
		if (color == 0.0)
			color = 0.5;
		else
			color = 0.0;
	}
	glutPostRedisplay();
}

void KeyboardCallback(unsigned char c, int x, int y) {
	switch (c) {
	case 'r':
		angle += 10;
		angle = angle % 360;
		break;
	case 'q':
		exit (0);
		break;
	}
	glutPostRedisplay();
}

void DisplayCallback()
{
    // clear the color buffer
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

	glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
	glOrtho( -2.0, 2.0, -2.0, 2.0, -2.0, 2.0 );
	glMatrixMode( GL_MODELVIEW );
	glLoadIdentity();
	glRotatef( 30, 1.0, 0.0, 0.0 );
	glRotatef( angle, 0.0, 1.0, 0.0 );
	
	float r = (sqrt(5)+1)/2;

	static GLfloat vertices[20][3] = {
		{1.0, 1.0, 1.0}, {-1.0, 1.0, 1.0}, {1.0, 1.0, -1.0}, {-1.0, 1.0, -1.0},
		{1.0, -1.0, 1.0}, {-1.0, -1.0, 1.0}, {1.0, -1.0, -1.0}, {-1.0, -1.0, -1.0},
		{1/r, 0.0, r}, {-1/r, 0.0, r}, {1/r, 0.0, -r}, {-1/r, 0.0, -r},
		{r, 1/r, 0.0}, {-r, 1/r, 0.0}, {r, -1/r, 0.0}, {-r, -1/r, 0.0},
		{0.0, r, 1/r}, {0.0, -r, 1/r}, {0.0, r, -1/r}, {0.0, -r, -1/r}
	};

	glColor3f( 1.0-color, 0.0, 0.0 );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[0]);
	  glVertex3fv(vertices[16]);
	  glVertex3fv(vertices[1]);
	  glVertex3fv(vertices[9]);
	  glVertex3fv(vertices[8]);
	glEnd();

	glColor3f( 0.0, 0.5+color, 0.0+color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[4]);
	  glVertex3fv(vertices[8]);
	  glVertex3fv(vertices[9]);
	  glVertex3fv(vertices[5]);
	  glVertex3fv(vertices[17]);
	glEnd();

	glColor3f( 1.0-color, 1.0-color, 0.0 );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[0]);
	  glVertex3fv(vertices[8]);
	  glVertex3fv(vertices[4]);
	  glVertex3fv(vertices[14]);
	  glVertex3fv(vertices[12]);
	glEnd();

	glColor3f( 0.0, 0.0, 1.0-color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[1]);
	  glVertex3fv(vertices[13]);
	  glVertex3fv(vertices[15]);
	  glVertex3fv(vertices[5]);
	  glVertex3fv(vertices[9]);
	glEnd();

	glColor3f( 1.0-color, 0.0, 1.0-color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[18]);
	  glVertex3fv(vertices[2]);
	  glVertex3fv(vertices[10]);
	  glVertex3fv(vertices[11]);
	  glVertex3fv(vertices[3]);
	glEnd();

	glColor3f( 1.0-color, 1.0-color, 1.0-color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[19]);
	  glVertex3fv(vertices[7]);
	  glVertex3fv(vertices[11]);
	  glVertex3fv(vertices[10]);
	  glVertex3fv(vertices[6]);
	glEnd();

	glColor3f( 0.5+color, 0.0, 0.0+color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[2]);
	  glVertex3fv(vertices[12]);
	  glVertex3fv(vertices[14]);
	  glVertex3fv(vertices[6]);
	  glVertex3fv(vertices[10]);
	glEnd();

	glColor3f( 0.0, 1.0-color, 0.0 );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[3]);
	  glVertex3fv(vertices[11]);
	  glVertex3fv(vertices[7]);
	  glVertex3fv(vertices[15]);
	  glVertex3fv(vertices[13]);
	glEnd();

	glColor3f( 0.0+color, 0.0, 0.5+color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[0]);
	  glVertex3fv(vertices[12]);
	  glVertex3fv(vertices[2]);
	  glVertex3fv(vertices[18]);
	  glVertex3fv(vertices[16]);
	glEnd();

	glColor3f( 0.5+color, 0.5+color, 0.0+color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[4]);
	  glVertex3fv(vertices[17]);
	  glVertex3fv(vertices[19]);
	  glVertex3fv(vertices[6]);
	  glVertex3fv(vertices[14]);
	glEnd();

	glColor3f( 0.5+color, 0.0+color, 0.5+color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[1]);
	  glVertex3fv(vertices[16]);
	  glVertex3fv(vertices[18]);
	  glVertex3fv(vertices[3]);
	  glVertex3fv(vertices[13]);
	glEnd();

	glColor3f( 0.5+color, 0.5+color, 0.5+color );
	glBegin( GL_POLYGON );
	  glVertex3fv(vertices[5]);
	  glVertex3fv(vertices[15]);
	  glVertex3fv(vertices[7]);
	  glVertex3fv(vertices[19]);
	  glVertex3fv(vertices[17]);
	glEnd();

    // draw the buffer to the screen
    glutSwapBuffers();
}


int main(int argc, char **argv)
{
    // create window and rendering context
    glutInit( &argc, argv );
    glutInitDisplayMode( GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE );
	glutInitWindowSize( 500, 500 );
	glutCreateWindow( "openGLDemo" );

    // register display callback
	glutDisplayFunc( DisplayCallback );
	glutKeyboardFunc( KeyboardCallback );
	glutMouseFunc( MouseCallback );

    glViewport( 0, 0, 500, 500 );
	glEnable( GL_DEPTH_TEST );

    // pass control over to GLUT
	glutMainLoop();

	return 0;       // never reached
}