/usr/include/simgear/scene/sky/stars.hxx is in libsimgear-dev 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | // stars.hxx -- model the stars
//
// Written by Durk Talsma. Originally started October 1997, for distribution
// with the FlightGear project. Version 2 was written in August and
// September 1998. This code is based upon algorithms and data kindly
// provided by Mr. Paul Schlyter. (pausch@saaf.se).
//
// Separated out rendering pieces and converted to ssg by Curt Olson,
// March 2000
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifndef _SG_STARS_HXX_
#define _SG_STARS_HXX_
#include <osg/Array>
#include <simgear/math/SGMath.hxx>
#include <simgear/structure/SGReferenced.hxx>
class SGStars : public SGReferenced {
osg::ref_ptr<osg::Vec4Array> cl;
int old_phase; // data for optimization
public:
// Constructor
SGStars( void );
// Destructor
~SGStars( void );
// initialize the stars structure
osg::Node* build( int num, const SGVec3d star_data[], double star_dist );
// repaint the planet magnitudes based on current value of
// sun_angle in degrees relative to verticle (so we can make them
// relatively dimmer during dawn and dusk
// 0 degrees = high noon
// 90 degrees = sun rise/set
// 180 degrees = darkest midnight
bool repaint( double sun_angle, int num, const SGVec3d star_data[] );
};
#endif // _SG_STARS_HXX_
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