#ifdef __APPLE__
#include <gl.h>
#include <glu.h>
#include <glut.h>
#else

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>

#endif

#include <assert.h>


static char *TITLE = "test_materials";


void init() {
     GLfloat LP[] = {(GLfloat) 0,
                          (GLfloat) 0,
                          (GLfloat) 10,
                          (GLfloat) 1};
     GLfloat A[] = {(GLfloat) 0.1,
                         (GLfloat) 0.1,
                         (GLfloat) 0.1};
     GLfloat S[] = {(GLfloat) 0.5,
                         (GLfloat) 0.5,
                         (GLfloat) 0.5};
     GLfloat D[] = {(GLfloat) 0.5,
                         (GLfloat) 0.5,
                         (GLfloat) 0.5};
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
    glEnable(GL_FRONT);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glLightfv(GL_LIGHT0, GL_POSITION, LP);
    glLightfv(GL_LIGHT0, GL_AMBIENT, A);
    glLightfv(GL_LIGHT0, GL_SPECULAR, S);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, D);

    glClearColor(0.f, 0.f, 0.f, 1.f);
}

void reshape(int width, int height) {
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(65.0, (float) width / (float) height, 1.0, 100);
}

void display() {

    static GLfloat RA[] = {(GLfloat) 1,
                                 (GLfloat) 0,
                                 (GLfloat) 0,
                                 (GLfloat) 1};
    static GLfloat RS[] = {(GLfloat) 1,
                                 (GLfloat) 0,
                                 (GLfloat) 0,
                                 (GLfloat) 1};
    static GLfloat RD[] = {(GLfloat) 1,
                                 (GLfloat) 0,
                                 (GLfloat) 0,
                                 (GLfloat) 1};

    static GLfloat GA[] = {(GLfloat) 0,
                                 (GLfloat) 1,
                                 (GLfloat) 0,
                                 (GLfloat) 1};
    static GLfloat GS[] = {(GLfloat) 0,
                                 (GLfloat) 1,
                                 (GLfloat) 0,
                                 (GLfloat) 1};
    static GLfloat GD[] = {(GLfloat) 0,
                                 (GLfloat) 1,
                                 (GLfloat) 0,
                                 (GLfloat) 1};

    static GLfloat BA[] = {(GLfloat) 0,
                                 (GLfloat) 0,
                                 (GLfloat) 1,
                                 (GLfloat) 1};
    static GLfloat BS[] = {(GLfloat) 0,
                                 (GLfloat) 0,
                                 (GLfloat) 1,
                                 (GLfloat) 1};
    static GLfloat BD[] = {(GLfloat) 0,
                                 (GLfloat) 0,
                                 (GLfloat) 1,
                                 (GLfloat) 1};
    static GLfloat Y = 0;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    gluLookAt(0, 0, 5, 
              0, 0, 0,
              0, 1, 0); 


    glBegin(GL_QUADS);
    glNormal3d(0, 0, 1);
    glMaterialfv(GL_FRONT, GL_AMBIENT, RA);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, RD);
    glMaterialfv(GL_FRONT, GL_SPECULAR, RS);
    glMaterialf(GL_FRONT, GL_SHININESS, Y);
    glVertex3d(0, 0, 0);
    glVertex3d(1, 0, 0);
    glVertex3d(1, 1, 0);
    glVertex3d(0, 1, 0);
    glEnd();

    glBegin(GL_TRIANGLES);
    glNormal3d(0, 0, 1);
    glMaterialfv(GL_FRONT, GL_AMBIENT, GA);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, GD);
    glMaterialfv(GL_FRONT, GL_SPECULAR, GS);
    glMaterialf(GL_FRONT, GL_SHININESS, Y);
    glVertex3d(1, 0, 0);
    glVertex3d(2, 0, 0);
    glVertex3d(2, 1, 0);
    glEnd();

    glBegin(GL_TRIANGLES);
    glNormal3d(0, 0, 1);
    glMaterialfv(GL_FRONT, GL_AMBIENT, BA);
    glMaterialfv(GL_FRONT, GL_DIFFUSE, BD);
    glMaterialfv(GL_FRONT, GL_SPECULAR, BS);
    glMaterialf(GL_FRONT, GL_SHININESS, Y);
    glVertex3d(0, 0, 0);
    glVertex3d(-1, 1, 0);
    glVertex3d(-1, 0, 0);
    glEnd();

    glutSwapBuffers();
}

int main(int argc, char **argv) {
    int window = 0;

    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
    glutInitWindowSize(640, 480);
    glutInitWindowPosition(0, 0);
    window = glutCreateWindow(TITLE);
    assert(window);
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    init();
    glutMainLoop();

    glutDestroyWindow(window);
    return 0;
}