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// Generated by CoffeeScript 1.4.0
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/*
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  Particle system wrapper/helper
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  @class bkcore.threejs.Particles
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  @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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*/
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(function() {
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  var Particle, Particles, exports, _base;
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  Particles = (function() {
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    /*
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        Creates a new particle system using given parameters
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        @param {Object{max, spawnRate, spawn, velocity, randomness,
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        force, spawnRadius, life, friction, color, color2, tint,
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        texture, size, blending, depthTest, transparent, opacity}} opts
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    */
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    function Particles(opts) {
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      var _ref, _ref1, _ref10, _ref11, _ref12, _ref13, _ref14, _ref15, _ref16, _ref17, _ref18, _ref19, _ref2, _ref3, _ref4, _ref5, _ref6, _ref7, _ref8, _ref9;
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      this.black = new THREE.Color(0x000000);
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      this.white = new THREE.Color(0xffffff);
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      this.material = new THREE.ParticleBasicMaterial({
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        color: (_ref = opts.tint) != null ? _ref : 0xffffff,
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        map: (_ref1 = opts.texture) != null ? _ref1 : null,
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        size: (_ref2 = opts.size) != null ? _ref2 : 4,
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        blending: (_ref3 = opts.blending) != null ? _ref3 : THREE.AdditiveBlending,
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        depthTest: (_ref4 = opts.depthTest) != null ? _ref4 : false,
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        transparent: (_ref5 = opts.transparent) != null ? _ref5 : true,
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        vertexColors: true,
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        opacity: (_ref6 = opts.opacity) != null ? _ref6 : 1.0,
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        sizeAttenuation: true
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      });
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      this.max = (_ref7 = opts.max) != null ? _ref7 : 1000;
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      this.spawnRate = (_ref8 = opts.spawnRate) != null ? _ref8 : 0;
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      this.spawn = (_ref9 = opts.spawn) != null ? _ref9 : new THREE.Vector3();
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      this.velocity = (_ref10 = opts.velocity) != null ? _ref10 : new THREE.Vector3();
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      this.randomness = (_ref11 = opts.randomness) != null ? _ref11 : new THREE.Vector3();
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      this.force = (_ref12 = opts.force) != null ? _ref12 : new THREE.Vector3();
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      this.spawnRadius = (_ref13 = opts.spawnRadius) != null ? _ref13 : new THREE.Vector3();
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      this.life = (_ref14 = opts.life) != null ? _ref14 : 60;
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      this.ageing = 1 / this.life;
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      this.friction = (_ref15 = opts.friction) != null ? _ref15 : 1.0;
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      this.color = new THREE.Color((_ref16 = opts.color) != null ? _ref16 : 0xffffff);
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      this.color2 = opts.color2 != null ? new THREE.Color(opts.color2) : null;
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      this.position = (_ref17 = opts.position) != null ? _ref17 : new THREE.Vector3();
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      this.rotation = (_ref18 = opts.rotation) != null ? _ref18 : new THREE.Vector3();
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      this.sort = (_ref19 = opts.sort) != null ? _ref19 : false;
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      this.pool = [];
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      this.buffer = [];
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      this.geometry = null;
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      this.system = null;
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      this.build();
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    }
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    /*
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        Emits given number of particles
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        @param  int count
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    */
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    Particles.prototype.emit = function(count) {
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      var emitable, i, p, _i, _results;
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      emitable = Math.min(count, this.pool.length);
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      _results = [];
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      for (i = _i = 0; 0 <= emitable ? _i <= emitable : _i >= emitable; i = 0 <= emitable ? ++_i : --_i) {
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        p = this.pool.pop();
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        p.available = false;
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        p.position.copy(this.spawn).addSelf(this.randomVector().multiplySelf(this.spawnRadius));
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        p.velocity.copy(this.velocity).addSelf(this.randomVector().multiplySelf(this.randomness));
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        p.force.copy(this.force);
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        p.basecolor.copy(this.color);
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        if (this.color2 != null) {
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          p.basecolor.lerpSelf(this.color2, Math.random());
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        }
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        _results.push(p.life = 1.0);
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      }
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      return _results;
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    };
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    /*
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        @private
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    */
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    Particles.prototype.build = function() {
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      var i, p, _i, _ref;
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      this.geometry = new THREE.Geometry();
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      this.geometry.dynamic = true;
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      this.pool = [];
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      this.buffer = [];
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      for (i = _i = 0, _ref = this.max; 0 <= _ref ? _i <= _ref : _i >= _ref; i = 0 <= _ref ? ++_i : --_i) {
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        p = new bkcore.threejs.Particle();
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        this.pool.push(p);
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        this.buffer.push(p);
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        this.geometry.vertices.push(p.position);
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        this.geometry.colors.push(p.color);
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      }
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      this.system = new THREE.ParticleSystem(this.geometry, this.material);
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      this.system.position = this.position;
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      this.system.rotation = this.rotation;
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      return this.system.sort = this.sort;
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    };
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    /*
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        @private
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    */
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    Particles.prototype.randomVector = function() {
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      return new THREE.Vector3(Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1);
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    };
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    /*
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        Updates particles (should be call in a RAF loop)
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        @param  float dt time delta ~1.0
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    */
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    Particles.prototype.update = function(dt) {
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      var df, dv, i, l, p, _i, _ref;
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      df = new THREE.Vector3();
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      dv = new THREE.Vector3();
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      for (i = _i = 0, _ref = this.buffer.length; 0 <= _ref ? _i <= _ref : _i >= _ref; i = 0 <= _ref ? ++_i : --_i) {
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        p = this.buffer[i];
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        if (p.available) {
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          continue;
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        }
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        p.life -= this.ageing;
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        if (p.life <= 0) {
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          p.reset();
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          this.pool.push(p);
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          continue;
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        }
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        l = p.life > 0.5 ? 1.0 : p.life + 0.5;
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        p.color.setRGB(l * p.basecolor.r, l * p.basecolor.g, l * p.basecolor.b);
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        if (this.friction !== 1.0) {
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          p.velocity.multiplyScalar(this.friction);
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        }
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        df.copy(p.force).multiplyScalar(dt);
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        p.velocity.addSelf(df);
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        dv.copy(p.velocity).multiplyScalar(dt);
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        p.position.addSelf(dv);
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      }
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      if (this.spawnRate > 0) {
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        this.emit(this.spawnRate);
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      }
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      this.geometry.verticesNeedUpdate = true;
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      return this.geometry.colorsNeedUpdate = true;
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    };
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    return Particles;
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  })();
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  /*
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    Particle sub class
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    @class bkcore.threejs.Particle
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    @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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  */
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  Particle = (function() {
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    function Particle() {
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      this.position = new THREE.Vector3(-10000, -10000, -10000);
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      this.velocity = new THREE.Vector3();
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      this.force = new THREE.Vector3();
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      this.color = new THREE.Color(0x000000);
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      this.basecolor = new THREE.Color(0x000000);
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      this.life = 0.0;
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      this.available = true;
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    }
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    Particle.prototype.reset = function() {
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      this.position.set(0, -100000, 0);
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      this.velocity.set(0, 0, 0);
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      this.force.set(0, 0, 0);
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      this.color.setRGB(0, 0, 0);
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      this.basecolor.setRGB(0, 0, 0);
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      this.life = 0.0;
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      return this.available = true;
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    };
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    return Particle;
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  })();
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  /*
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    Exports
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    @package bkcore.threejs
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  */
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  exports = exports != null ? exports : this;
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  exports.bkcore || (exports.bkcore = {});
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  (_base = exports.bkcore).threejs || (_base.threejs = {});
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  exports.bkcore.threejs.Particle = Particle;
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  exports.bkcore.threejs.Particles = Particles;
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}).call(this);
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