#include <GL/glut.h>

// Prototypes
void brass();
void silver();

GLfloat light_position[] = {10.0f, 10.0f, 10.0f, 1.0f};
GLfloat diffuse_light[] = {0.9f, 0.9, 0.9f, 0.0f};

// brass material
GLfloat brass_ambient[]={0.33, 0.22, 0.03, 1.0};
GLfloat brass_diffuse[]={0.78, 0.57, 0.11, 1.0};
GLfloat brass_specular[]={0.99, 0.00, 0.0, 1.0};
GLfloat brass_shininess = 27.8;

// Silver
GLfloat brass1_ambient[]={0.33, 0.33, 0.33, 1.0};
GLfloat brass1_diffuse[]={0.78, 0.78, 0.78, 1.0};
GLfloat brass1_specular[]={0.99, 0.99, 0.99, 1.0};
GLfloat brass1_shininess = 27.8;

float degree = 0.0f;

void paint () {
	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	glPushMatrix();
		glTranslatef (0, -2, -15);
		brass();
		glutSolidTeapot (1);
		glPushMatrix();
			glRotatef (degree, 0, 1, 0);
			glTranslatef (0, 0, 5);
			glRotatef (-degree, 0, 1, 0);
			//glLightfv (GL_LIGHT0, GL_POSITION, light_position);
			glScalef (0.5, 0.5, 0.5);
			silver();
			glutSolidTeapot (1);  // earth
			glPushMatrix();
				glRotatef (degree*3, 0, 1, 0);
				glTranslatef (0, 0, 3);
				glScalef (0.1, 0.1, 0.1);
				glutSolidTeapot (1);
			glPopMatrix();
		glPopMatrix();
	glPopMatrix();

	glFlush();
	glutSwapBuffers();
	degree += 0.1f;
	glutPostRedisplay();
}

void brass() {
	glMaterialfv(GL_FRONT, GL_AMBIENT, brass_ambient);
	glMaterialfv(GL_FRONT, GL_DIFFUSE, brass_diffuse);
	glMaterialfv(GL_FRONT, GL_SPECULAR, brass_specular);
	glMaterialf(GL_FRONT, GL_SHININESS, brass_shininess);
}
void silver() {
	glMaterialfv(GL_FRONT, GL_AMBIENT, brass1_ambient);
	glMaterialfv(GL_FRONT, GL_DIFFUSE, brass1_diffuse);
	glMaterialfv(GL_FRONT, GL_SPECULAR, brass1_specular);
	glMaterialf(GL_FRONT, GL_SHININESS, brass1_shininess);
}

void doLights() {
	glEnable (GL_LIGHTING);
	glEnable (GL_LIGHT0);
	glLightfv (GL_LIGHT0, GL_POSITION, light_position);
	glLightfv (GL_LIGHT0, GL_DIFFUSE, diffuse_light);
}

void doCamera() {
	// Setup viewing
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity();
	gluPerspective (60.0f, 1.5, 0.1, 1000);
	glMatrixMode (GL_MODELVIEW);
}

int main (int argc, char** argv) {
	glutInit(&argc, argv);
	glutInitDisplayMode (GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
	glutCreateWindow ("June 8th, 2006");

	glEnable (GL_DEPTH_TEST);
	doCamera();
	doLights();
	glutDisplayFunc (paint);
	glutMainLoop();
}