/*****************************************************************
  overlay.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 createOverlay(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;
OrthoCamera overlayCamera(0, 1, 0, 1);
Light light;
Object root;
Object overlayRoot;


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, 0, 18);
    light.setInfinitePosition(1, 1, 2);
    createScene(root);
    createOverlay(overlayRoot);
    
    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(-4, -5, -3);
    quadric->setTransform(*transform);
    quadric->setUpdateCallback(bounceBall);
    root.attach(*quadric);
    
    quadric = new QuadricObject;
    quadric->makeCone(4.0, 14.0, 24, 1, DMS_Y);
    material = new Material(Color::White);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(2, -10, 0);
    quadric->setTransform(*transform);
    root.attach(*quadric);
    
    square = new Square(-10, -10, 10, 10, DMS_Y);
    material = new Material(Color::Green);
    square->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(0, -10, 0);
    square->setTransform(*transform);
    root.attach(*square);
    }


void createOverlay(Object& root)
    {
    Square * square;
    Texture2D * texture;
    
    square = new Square(0, 0, 1, 1, DMS_Z);
    texture = new Texture2D("goldfrm.sgi");
    square->setTexture(*texture);
    square->setTransparency(Transparency::AlphaTestZero);
    root.attach(*square);
    }


void drawEverything(void)
    {
    glClearColor(0.5, 0.7, 1.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glEnable(GL_DEPTH_TEST);
    
    camera.apply();
    light.apply();
    root.drawAll();
    light.disable();

    glDisable(GL_DEPTH_TEST);
    overlayCamera.apply();
    glColor4f(1, 1, 1, 1);
    overlayRoot.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) - 10;
    xform.setTranslation(-4, 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();
    }