Example GpuParticles

class GpuParticles extends SampleApp {

  var parts : h3d.parts.GpuParticles;
  var group : h3d.parts.GpuParticles.GpuPartGroup;
  var box : h3d.scene.Box;
  var tf : h2d.Text;
  var moving = false;
  var time = 0.;

  override function init() {
    super.init();
    parts = new h3d.parts.GpuParticles(s3d);

    var g = new h3d.parts.GpuParticles.GpuPartGroup(parts);

    g.emitMode = Cone;
    g.emitAngle = 0.5;
    g.emitDist = 0;

    g.fadeIn = 0.8;
    g.fadeOut = 0.8;
    g.fadePower = 10;
    g.gravity = 1;
    g.size = 0.1;
    g.sizeRand = 0.5;

    g.rotSpeed = 10;

    g.speed = 2;
    g.speedRand = 0.5;

    g.life = 2;
    g.lifeRand = 0.5;
    g.nparts = 10000;

    addSlider("Amount", function() return parts.amount, function(v) parts.amount = v);
    addSlider("Speed", function() return g.speed, function(v) g.speed = v, 0, 10);
    addSlider("Gravity", function() return g.gravity, function(v) g.gravity = v, 0, 5);
    addCheck("Sort", function() return g.sortMode == Dynamic, function(v) g.sortMode = v ? Dynamic : None);
    addCheck("Loop", function() return g.emitLoop, function(v) { g.emitLoop = v; if( !v ) parts.currentTime = 0; });
    addCheck("Move", function() return moving, function(v) moving = v);
    addCheck("Relative", function() return g.isRelative, function(v) g.isRelative = v);

    parts.onEnd = function() {
      engine.backgroundColor = 0xFF000080;
      parts.currentTime = 0;
    };
    parts.addGroup(g);
    group = g;

    new h3d.scene.CameraController(20, s3d);
    box = new h3d.scene.Box(0x80404050, parts.bounds, parts);

    tf = addText();
  }



  override function update(dt:Float) {

    if( moving ) {
      time += dt * 0.6;
      parts.x = Math.cos(time) * 5;
      parts.y = Math.sin(time) * 5;
    }

    if( engine.backgroundColor&0xFFFFFF > 0 )
      engine.backgroundColor -= 8;

    var cur = @:privateAccess group.currentParts;
    tf.text = ("cur=" + Std.int(cur * 100 / group.nparts) + "%");
    if( parts.uploadedCount > 0 )
      tf.text += " U="+parts.uploadedCount;
  }

  static function main() {
    new GpuParticles();
  }

}

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