//// 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" #define __interface__Starfield_impl__#include "starfield/Controller.h"#undef __interface__Starfield_impl__ Stars::Stars() :     _ptrController(0l) {     _ptrController = new starfield::Controller; } Stars::~Stars() {     delete _ptrController; } bool Stars::readInput(const char* url, const char* cacheFile, unsigned limit) {    return _ptrController->readInput(url, cacheFile, limit); } bool Stars::setResolution(unsigned k) {     return _ptrController->setResolution(k); } float Stars::changeLOD(float fraction, float overalloc, float realloc) {     return float(_ptrController->changeLOD(fraction, overalloc, realloc));}  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));      _ptrController->render(fovDiagonal, aspect, glm::affineInverse(view), alpha); }