/*****************************************************************
  rearview.cpp
  by Dave Pape
  20 April 2003

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

using namespace dms;

void createScene(Object& root);
void drawEverything(void);
void bounceBall(dms::Object&,void *);

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


PerspCamera camera;
PerspCamera rearviewCamera;
Light light;
Object root;


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, 5, 18);
    rearviewCamera.setAspect(-256.0/100.0);
    light.setInfinitePosition(1, 1, 2);
    createScene(root);
    
    glutMainLoop();
    return 0;
    }


void createScene(Object& root)
    {
    QuadricObject * quadric;
    Square * square;
    Material * material;
    SimpleTransform * transform;
    
    quadric = new QuadricObject;
    quadric->makeSphere(2.5, 24, 12);
    material = new Material(Color::Yellow);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(-6, 0, -3);
    quadric->setTransform(*transform);
    quadric->setUpdateCallback(bounceBall);
    root.attach(*quadric);
    
    quadric = new QuadricObject;
    quadric->makeCone(3.0, 8.0, 24, 1, DMS_Y);
    material = new Material(Color::Blue);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(2, 0, 0);
    quadric->setTransform(*transform);
    root.attach(*quadric);
    
    quadric = new QuadricObject;
    quadric->makeCone(3.0, 8.0, 24, 1, DMS_Y);
    material = new Material(Color::Grey50);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(-5, 0, 10);
    quadric->setTransform(*transform);
    root.attach(*quadric);
    
    quadric = new QuadricObject;
    quadric->makeCone(5.0, 5.0, 24, 1, DMS_Y);
    material = new Material(Color::Blue);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(20, 0, -28);
    quadric->setTransform(*transform);
    root.attach(*quadric);
    
    quadric = new QuadricObject;
    quadric->makeCone(1.0, 10.0, 24, 1, DMS_Y);
    material = new Material(Color::Cyan);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(-5, 0, -10);
    quadric->setTransform(*transform);
    root.attach(*quadric);
    
    quadric = new QuadricObject;
    quadric->makeCone(1.0, 10.0, 24, 1, DMS_Y);
    material = new Material(Color::Red);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(8, 0, 10);
    quadric->setTransform(*transform);
    root.attach(*quadric);
    
    square = new Square(-50, -50, 50, 50, DMS_Y);
    material = new Material(Color::Green);
    square->setMaterial(*material);
    root.attach(*square);
    }


void drawEverything(void)
    {
    glViewport(0, 0, glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT));
    glScissor(0, 0, glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT));
    glClearColor(0.5, 0.7, 1.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_SCISSOR_TEST);
    
    camera.apply();
    light.apply();
    root.drawAll();

    glViewport(128, 400, 256, 100);
    glScissor(128, 400, 256, 100);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    rearviewCamera.setPosition(camera.position());
    rearviewCamera.setXRotation(camera.xRotation());
    rearviewCamera.setYRotation(camera.yRotation() - 180);
    rearviewCamera.apply();
    light.apply();
    root.drawAll();

    glutSwapBuffers();

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


void bounceBall(dms::Object& object,void *)
    {
    dms::SimpleTransform& xform = (dms::SimpleTransform&)object.transform();
    float y = fabs(sin(dms::currentTime()) * 10);
    xform.setTranslation(-6, y, -3);
    }


void key(unsigned char k, int x, int y)
    {
    if (k == 27)
        exit(0);
    }


void specialkey(int k, int x, int y)
    {
    if (k == GLUT_KEY_LEFT)
        camera.turn(1);
    else if (k == GLUT_KEY_RIGHT)
        camera.turn(-1);
    else if (k == GLUT_KEY_UP)
        camera.pitch(1);
    else if (k == GLUT_KEY_DOWN)
        camera.pitch(-1);
    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)
    {
    root.updateAll();
    glutPostRedisplay();
    }