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#include <stdlib.h>
#include <gl\glut.h>
#include "windows.h"

static int spin = 0; // Angulo de giro

// Inicializamos propiedades de material, fuente de luz, modelo de iluminacion y bufer de profundidad
void init(void)
{
glClearColor(0.0,0.0,0.0,0.0); // Color de fondo
glShadeModel(GL_SMOOTH); // Como se van a colocar los colores
// glShadeMode(GL_FLAT)
glEnable(GL_LIGHTING);// Activando luces
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHT2);
glEnable(GL_DEPTH_TEST); // Activando buffer de profundidad
}

// ---------------- FUNCION DE DIBUJADO -------------------
void dibujado(void)
{
GLfloat position0[] = {0.0, 0.0, 1.5, 1.0};
GLfloat position1[] = {0.0, 1.5, 0.0, 1.0};
GLfloat position2[] = {1.5, 0.0, 0.0, 1.0};
GLfloat difusse0[] = {1.0, 0.0, 0.0, 1.0};
GLfloat difusse1[] = {0.0, 1.0, 0.0, 1.0};
GLfloat difusse2[] = {0.0, 0.0, 1.0, 1.0};
GLfloat spec0[] = {1.0, 1.0, 1.0, 1.0};
GLfloat spec1[] = {1.0, 1.0, 1.0, 1.0};
GLfloat spec2[] = {1.0, 1.0, 1.0, 1.0};
//---------------- MATERIAL ORO --------------------
GLfloat gold_amb[] = {0.24725, 0.1995, 0.0745, 1.0};
GLfloat gold_dif[] = {0.75164, 0.60648, 0.22648, 1.0};
GLfloat gold_spec[] = {0.628281, 0.555802, 0.366065, 1.0};
GLfloat gold_shin = 51.2;

glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse0);
glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse1);
glLightfv(GL_LIGHT2, GL_DIFFUSE, diffuse2);

glLightfv(GL_LIGHT0, GL_SPECULAR, spec0);
glLightfv(GL_LIGHT1, GL_SPECULAR, spec1);
glLightfv(GL_LIGHT2, GL_SPECULAR, spec2);

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
gluLookAt(5, 5.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
glPushMatrix();
glRotated((GLdouble) spin, 0.0, 1.0, 0.0);
glLightfv(GL_LIGHT0,GL_POSITION,position0);

glTranslated(0.0, 0.0, 1.5);
glDisable (GL_LIGHTING);

glColor3f(1.0,0.0,0.0);
glutWireSphere(0.1,10,10);
glEnable(GL_LIGHTING);
glPopMatrix();
glPushMatrix();
glRotated((GLdouble) spin*2, 1.0,0.0,0.0);
glLightfv(GL_LIGHT1, GL_POSITION, position1);

glTranslated(0.0,1.5,0.0);
glDisable(GL_LIGHTING);
glColor3f(0.0,1.0,0.0);
glutWireSphere(0.1,10,10);
glEnable(GL_LIGHTING);
glPopMatrix();
glPushMatrix();
glRotated((GLdouble) spin*4, 0.0,0.0,1.0);
glLightfv(GL_LIGHT2, GL_POSITION, position2);
glTranslated(1.5,0.0,0.0);
glDisable(GL_LIGHTING);
glColor3f(0.0,0.0,1.0);
glutWireSphere(0.1,10,10);
glEnable(GL_LIGHTING);
glPopMatrix();
glMaterialfv(GL_FRONT, GL_AMBIENT, gold_amb);
glMaterialfv(GL_FRONT, GL_DIFFUSE, gold_dif);
glMaterialfv(GL_FRONT, GL_SPECULAR, gold_spec);
glMaterialf(GL_FRONT, GL_SHININESS, gold_shin);
glutSolidTeapot(1);
glPopMatrix();
glFlush();
}

//-------------------- FUNCION REDIMENSION ------------------
void redimensionar( int ancho, int alto)
{
glViewport(0,0, (GLsizei) ancho, (GLsizei) alto);
glMatrixMode(GL_PROJECTION); // Activamos la pila de modelado
glLoadIdentity();
gluPerspective(40.0, (GLfloat) ancho/ (GLfloat) alto, 1.0,20.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

//-------------------- FUNCION TECLADO ----------------
void teclado(unsigned char key, int x, int y)
{
switch(key)
{
   case 27:
      exit(0);
      break;
}
}

//-----------------------FUNCION ANIMACION -----------------
void animacion()
{
spin = (spin+1) % 360;
Sleep(50);
glutPostRedisplay();
}

//--------------- PRINCIPAL ------------------
int main( int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(800, 600);
glutInitWindowPosition(100,100);
glutCreateWindow(argv[0]);
init();
glutDisplayFunc(dibujado);
glutReshapeFunc(redimensionar);
glutIdleFunc(animacion);
glutKeyboardFunc(teclado);
glutMainLoop();
return 0;
}