/*****************************************************************
  gas.cpp
  by Dave Pape
  24 March 2003

*****************************************************************/
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include <stdio.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <dms/dms.h>
#include "gasParticles.h"
#include "fountainParticles.h"

using namespace dms;

void createScene(Object& root);
void drawEverything(void);

void key(unsigned char k, int x, int y);
void specialkey(int k, int x, int y);
void idle(void);


PerspCamera camera;
Light light;
Object root;

Vector3 gasSource(10, 0, 0);
gasParticles particleSystem(2000, gasSource, 1);
Texture2D gasTexture("gas.sgi");
fountainParticles jet(4000, Vector3::Zero, 0.1);

Color skyColor = Color::Black;

bool active = false;


int main(int argc, char *argv[])
    {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize(512,512);
    glutCreateWindow(argv[0]);
    
    glutDisplayFunc(drawEverything);
    glutKeyboardFunc(key);
    glutSpecialFunc(specialkey);
    glutIdleFunc(idle);
    
    camera.setPosition(0, 10, 30);
    camera.setXRotation(-20);
    light.setInfinitePosition(0, 1, 1);
    createScene(root);
    
    glutMainLoop();
    return 0;
    }


void createScene(Object& root)
    {
    QuadricObject * star = new QuadricObject;
    star->makeSphere(0.5);
    star->setMaterial(*(new Material(Color::White)));
    root.attach(*star);
    
    star = new QuadricObject;
    star->makeSphere(4, 32, 16);
    star->setMaterial(*(new Material(Color::Yellow)));
    SimpleTransform * xform = new SimpleTransform;
    xform->setTranslation(-9, 0, -5);
    star->setTransform(*xform);
    root.attach(*star);
    
    particleSystem.initialize();
    jet.initialize();
    jet.setGravity(Vector3::Zero);
    }


void drawEverything(void)
    {
    glClearColor(skyColor[0], skyColor[1], skyColor[2], skyColor[3]);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glEnable(GL_DEPTH_TEST);
    
    camera.apply();
    light.apply();
    root.drawAll();
    gasTexture.apply();
    particleSystem.draw();
    gasTexture.disable();
    jet.draw();
    glPushMatrix();
     glRotatef(180, 1, 0, 0);
     jet.draw();
    glPopMatrix();
    
    glutSwapBuffers();

    checkGLError("end-of-frame");
    }


void key(unsigned char k, int x, int y)
    {
    if (k == 27)
        exit(0);
    else if (k == ' ')
        {
        active = !active;
        if (active)
            {
            particleSystem.initialize();
            jet.initialize();
            }
        }
    }


void specialkey(int k, int x, int y)
    {
    if (k == GLUT_KEY_LEFT)
        camera.turn(3);
    else if (k == GLUT_KEY_RIGHT)
        camera.turn(-3);
    else if (k == GLUT_KEY_UP)
        camera.pitch(2);
    else if (k == GLUT_KEY_DOWN)
        camera.pitch(-2);
    else if (k == GLUT_KEY_HOME)
        camera.moveForward(0.25);
    else if (k == GLUT_KEY_END)
        camera.moveForward(-0.25);
    else if (k == GLUT_KEY_PAGE_UP)
        camera.zoom(-1);
    else if (k == GLUT_KEY_PAGE_DOWN)
        camera.zoom(1);
    }


void idle(void)
    {
    dms::beginFrame();
    root.updateAll();
    if (active)
        {
        particleSystem.update();
        jet.update();
        }
    glutPostRedisplay();
    }