/*
 * GLUT Shapes Demo
 *
 * Written by Nigel Stewart November 2003
 *
 * This program is test harness for the sphere, cone
 * and torus shapes in GLUT.
 *
 * Spinning wireframe and smooth shaded shapes are
 * displayed until the ESC or q key is pressed.  The
 * number of geometry stacks and slices can be adjusted
 * using the + and - keys.
 */
#include <windows.h>
#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

#include <stdlib.h>

static int slices = 16;
static int stacks = 16;
const GLfloat *swiatlo;
/* GLUT callback Handlers */

static void resize(int width, int height)
{
    const float ar = (float) width / (float) height;

    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity() ;
}

static void display(void)
{
    const double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
    const double a = t*90.0;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glColor3d(1,0,0);

    //glLightfv (GL_LIGHT0, GL_POSITION, swiatlo); // ustawienie światła pod podłogą
    glPushMatrix ();
    glFrontFace (GL_CW); // zmiana domyślnego nawinięcia
    glScalef (1.0f, -1.0f, 1.0f); // przeskalowanie położenia wszystkich aktorów

    glPushMatrix();
        glTranslated(0,1,-6);
        glRotated(300,1,0,0);
        glRotated(a,1,1,0);
        glutSolidCube(1);
    glPopMatrix();

    glFrontFace (GL_CCW); // przywrócenie domyślnego nawinięcia
    glPopMatrix ();
    glDisable (GL_LIGHTING); // wyłączenie oświetlenia
    glEnable (GL_BLEND); // włączenie mieszania kolorów
    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // równanie mieszania kolorów

    glPushMatrix();
    glTranslated(0,0,-7);
    glRotated(10,1,0,0);
    double dx = 0.5;
    double dy = 0.5;

    glBegin(GL_QUADS);
    for(double x=-2; x<2; x+=dx)
        for(double y=-20; y<20;y+=dy)
    {
        if(static_cast<int> ((x+y)/dx)%2==0)
            glColor4f(0,0,1,0.5);
        else
            glColor4f(0,1,0,0.5);
            glVertex3f(x, 0, y);
            glVertex3f(x, 0, y+dy);
            glVertex3f(x+dx, 0, y +dy);
            glVertex3f(x+dx, 0 ,y);
    }
    glEnd();
    glPopMatrix();

    glDisable (GL_BLEND); // wyłączenie mieszania
    glEnable (GL_LIGHTING); // włączenie oświetlenia
    //glLightfv (GL_LIGHT0, GL_POSITION, swiatlo); // ustawienie światła nad podłogą

    glPushMatrix();
        glTranslated(0,1,-6);
        glRotated(60,0,1,1);
        glRotated(-a,0,0,1);
        glutSolidCube(1);
    glPopMatrix();

    // ustalenie koloru mgły
    GLfloat Kolor_mgly[] = {0.5, 0.5, 0.5, 1.0};
    // ustawienia parametrów mgły
    glFogfv(GL_FOG_COLOR, Kolor_mgly); // ustawienie koloru mgły
    glFogf(GL_FOG_START, 10.0f); // początek mgły
    glFogf(GL_FOG_END, 100.0f); // koniec mgły
    glFogf(GL_FOG_DENSITY, 0.2f); // gęstość mgły
    glFogf(GL_FOG_MODE, GL_EXP); // rozkład mgły
    glEnable(GL_FOG); // włączeni emgły

    glutSwapBuffers();
}


static void key(unsigned char key, int x, int y)
{
    switch (key)
    {
        case 27 :
        case 'q':
            exit(0);
            break;

        case '+':
            slices++;
            stacks++;
            break;

        case '-':
            if (slices>3 && stacks>3)
            {
                slices--;
                stacks--;
            }
            break;
    }

    glutPostRedisplay();
}

static void idle(void)
{
    glutPostRedisplay();
}

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };

/* Program entry point */

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitWindowSize(640,480);
    glutInitWindowPosition(10,10);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutReshapeFunc(resize);
    glutDisplayFunc(display);
    glutKeyboardFunc(key);
    glutIdleFunc(idle);

    glClearColor(1,1,1,1);
    glEnable(GL_CULL_FACE);
    glCullFace(GL_BACK);

    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();

    glColor4f (1.0f, 0.0f, 0.0f, 0.4f);
    glDisable (GL_LIGHTING);
    glEnable (GL_BLEND);
    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glutSolidCube (0.3f);
    glDisable (GL_BLEND);
    glEnable (GL_LIGHTING);

    return EXIT_SUCCESS;
}