/*****************************************************************
  motionblur.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;
Light light;
Object root;


int main(int argc, char *argv[])
    {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_ACCUM);
    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);
    
    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, 0, -3);
    quadric->setTransform(*transform);
    quadric->setUpdateCallback(bounceBall);
    root.attach(*quadric);
    
    quadric = new QuadricObject;
    quadric->makeCone(1.0, 14.0, 24, 1, DMS_Y);
    material = new Material(Color::White);
    quadric->setMaterial(*material);
    transform = new SimpleTransform;
    transform->setTranslation(0, -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);
    }


float dt=0, curTime=0;

void drawEverything(void)
    {
    dms::beginFrame();
    curTime = dms::currentTime();
    glClear(GL_ACCUM_BUFFER_BIT);
    glEnable(GL_DEPTH_TEST);
    
    for (int i=0; i < 20; i++)
        {
        glClearColor(0.5, 0.7, 1.0, 0.0);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        camera.apply();
        light.apply();
        root.drawAll();
        glAccum(GL_ACCUM, 0.05);
        root.updateAll();
        curTime += (dms::deltaTime()*3)/20.0;
        }
    
    glAccum(GL_RETURN, 1.0);
    
    glutSwapBuffers();
    checkGLError("end-of-frame");
    }


void bounceBall(dms::Object& object,void *)
    {
    dms::SimpleTransform& xform = (dms::SimpleTransform&)object.transform();
    float y = fabs(sin(curTime*4+1) * 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();
    }