//// Stars.cpp// interface//// Created by Tobias Schwinger on 3/22/13.// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.// #include "InterfaceConfig.h"#include "Stars.h"  #include "starfield/Controller.h" Stars::Stars() :     _controller(0l), _starsLoaded(false) {    _controller = new starfield::Controller;} Stars::~Stars() {     delete _controller; } bool Stars::generate(unsigned numStars, unsigned seed) {    _starsLoaded = _controller->computeStars(numStars, seed);    return _starsLoaded;} bool Stars::setResolution(unsigned k) {     return _controller->setResolution(k); } void Stars::render(float fovY, float aspect, float nearZ, float alpha) {     // determine length of screen diagonal from quadrant height and aspect ratio    float quadrantHeight = nearZ * tan(angleConvert<Degrees,Radians>(fovY) * 0.5f);    float halfDiagonal = sqrt(quadrantHeight * quadrantHeight * (1.0f + aspect * aspect));     // determine fov angle in respect to the diagonal    float fovDiagonal = atan(halfDiagonal / nearZ) * 2.0f;     // pull the modelview matrix off the GL stack    glm::mat4 view; glGetFloatv(GL_MODELVIEW_MATRIX, glm::value_ptr(view));      _controller->render(fovDiagonal, aspect, glm::affineInverse(view), alpha);}