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simgear/Astro/stars.cxx

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// stars.cxx -- data structures and routines for managing and rendering stars.
//
// Written by Curtis Olson, started August 1997.
//
// Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program 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
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$
// (Log is kept at end of this file)
//*************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include "Include/compiler.h"
#ifdef FG_HAVE_STD_INCLUDES
# include <cmath>
# include <cstdio>
# include <cstring>
# include <ctime>
#else
# include <math.h>
# include <stdio.h>
# include <string.h>
# include <time.h>
#endif
#include <string>
#include <GL/glut.h>
#include <XGL/xgl.h>
#include <Aircraft/aircraft.hxx>
#include <Debug/logstream.hxx>
#include <Include/fg_constants.h>
#include <Misc/fgstream.hxx>
#include <Main/options.hxx>
#include <Main/views.hxx>
#include <Misc/stopwatch.hxx>
#include <Time/fg_time.hxx>
#include "Misc/stopwatch.hxx"
#include "stars.hxx"
FG_USING_STD(getline);
#define EpochStart (631065600)
#define DaysSinceEpoch(secs) (((secs)-EpochStart)*(1.0/(24*3600)))
#define FG_MAX_STARS 3500
// Define four structures, each with varying amounts of stars
static GLint stars[FG_STAR_LEVELS];
// Initialize the Star Management Subsystem
int fgStarsInit( void ) {
Point3D starlist[FG_MAX_STARS];
// struct CelestialCoord pltPos;
double right_ascension, declination, magnitude;
double min_magnitude[FG_STAR_LEVELS];
// double ra_save, decl_save;
// double ra_save1, decl_save1;
int i, j, starcount, count;
FG_LOG( FG_ASTRO, FG_INFO, "Initializing stars" );
if ( FG_STAR_LEVELS < 4 ) {
FG_LOG( FG_ASTRO, FG_ALERT, "Big whups in stars.cxx" );
exit(-1);
}
// build the full path name to the stars data base file
string path = current_options.get_fg_root() + "/Astro/stars" + ".gz";
FG_LOG( FG_ASTRO, FG_INFO, " Loading stars from " << path );
fg_gzifstream in( path );
if ( ! in ) {
FG_LOG( FG_ASTRO, FG_ALERT, "Cannot open star file: " << path );
exit(-1);
}
starcount = 0;
StopWatch timer;
timer.start();
// read in each line of the file
while ( ! in.eof() && starcount < FG_MAX_STARS )
{
in >> skipcomment;
string name;
getline( in, name, ',' );
in >> starlist[starcount];
++starcount;
}
timer.stop();
FG_LOG( FG_ASTRO, FG_INFO,
"Loaded " << starcount << " stars in "
<< timer.elapsedSeconds() << " seconds" );
min_magnitude[0] = 4.2;
min_magnitude[1] = 3.6;
min_magnitude[2] = 3.0;
min_magnitude[3] = 2.4;
min_magnitude[4] = 1.8;
min_magnitude[5] = 1.2;
min_magnitude[6] = 0.6;
min_magnitude[7] = 0.0;
// build the various star display lists
for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
stars[i] = xglGenLists(1);
xglNewList( stars[i], GL_COMPILE );
xglBegin( GL_POINTS );
count = 0;
for ( j = 0; j < starcount; j++ ) {
magnitude = starlist[j].z();
// printf("magnitude = %.2f\n", magnitude);
if ( magnitude < min_magnitude[i] ) {
right_ascension = starlist[j].x();
declination = starlist[j].y();
count++;
// scale magnitudes to (0.0 - 1.0)
magnitude = (0.0 - magnitude) / 5.0 + 1.0;
// scale magnitudes again so they look ok
if ( magnitude > 1.0 ) { magnitude = 1.0; }
if ( magnitude < 0.0 ) { magnitude = 0.0; }
// magnitude =
// magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
magnitude = magnitude * 0.9 +
(((FG_STAR_LEVELS - 1) - i) * 0.014);
// printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
// name, right_ascension, declination, magnitude);
xglColor3f( magnitude, magnitude, magnitude );
//xglColor3f(0,0,0);*/
xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
50000.0*sin(right_ascension)*cos(declination),
50000.0*sin(declination) );
}
} // while
xglEnd();
/*
xglBegin(GL_LINE_LOOP);
xglColor3f(1.0, 0.0, 0.0);
xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save-0.2),
50000.0 * sin(ra_save-0.2) * cos(decl_save-0.2),
50000.0 * sin(decl_save-0.2) );
xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save-0.2),
50000.0 * sin(ra_save+0.2) * cos(decl_save-0.2),
50000.0 * sin(decl_save-0.2) );
xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save+0.2),
50000.0 * sin(ra_save+0.2) * cos(decl_save+0.2),
50000.0 * sin(decl_save+0.2) );
xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save+0.2),
50000.0 * sin(ra_save-0.2) * cos(decl_save+0.2),
50000.0 * sin(decl_save+0.2) );
xglEnd();
*/
/*
xglBegin(GL_LINE_LOOP);
xglColor3f(0.0, 1.0, 0.0);
xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1-0.2),
50000.0 * sin(ra_save1-0.2) * cos(decl_save1-0.2),
50000.0 * sin(decl_save1-0.2) );
xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1-0.2),
50000.0 * sin(ra_save1+0.2) * cos(decl_save1-0.2),
50000.0 * sin(decl_save1-0.2) );
xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1+0.2),
50000.0 * sin(ra_save1+0.2) * cos(decl_save1+0.2),
50000.0 * sin(decl_save1+0.2) );
xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1+0.2),
50000.0 * sin(ra_save1-0.2) * cos(decl_save1+0.2),
50000.0 * sin(decl_save1+0.2) );
xglEnd();
*/
xglEndList();
FG_LOG( FG_ASTRO, FG_INFO,
" Loading " << count << " stars brighter than "
<< min_magnitude[i] );
}
return 1; // OK, we got here because initialization worked.
}
// Draw the Stars
void fgStarsRender( void ) {
FGInterface *f;
fgLIGHT *l;
fgTIME *t;
int i;
f = current_aircraft.fdm_state;
l = &cur_light_params;
t = &cur_time_params;
// FG_PI_2 + 0.1 is about 6 degrees after sundown and before sunrise
// t->sun_angle = 3.0; // to force stars to be drawn (for testing)
// render the stars
if ( l->sun_angle > (FG_PI_2 + 5 * DEG_TO_RAD ) ) {
// determine which star structure to draw
if ( l->sun_angle > (FG_PI_2 + 10.0 * DEG_TO_RAD ) ) {
i = 0;
} else if ( l->sun_angle > (FG_PI_2 + 8.8 * DEG_TO_RAD ) ) {
i = 1;
} else if ( l->sun_angle > (FG_PI_2 + 7.5 * DEG_TO_RAD ) ) {
i = 2;
} else if ( l->sun_angle > (FG_PI_2 + 7.0 * DEG_TO_RAD ) ) {
i = 3;
} else if ( l->sun_angle > (FG_PI_2 + 6.5 * DEG_TO_RAD ) ) {
i = 4;
} else if ( l->sun_angle > (FG_PI_2 + 6.0 * DEG_TO_RAD ) ) {
i = 5;
} else if ( l->sun_angle > (FG_PI_2 + 5.5 * DEG_TO_RAD ) ) {
i = 6;
} else {
i = 7;
}
// printf("RENDERING STARS = %d (night)\n", i);
xglCallList(stars[i]);
} else {
// printf("not RENDERING STARS (day)\n");
}
}
// $Log$
// Revision 1.27 1999/02/05 21:28:52 curt
// Modifications to incorporate Jon S. Berndts flight model code.
//
// Revision 1.26 1999/02/02 20:13:30 curt
// MSVC++ portability changes by Bernie Bright:
//
// Lib/Serial/serial.[ch]xx: Initial Windows support - incomplete.
// Simulator/Astro/stars.cxx: typo? included <stdio> instead of <cstdio>
// Simulator/Cockpit/hud.cxx: Added Standard headers
// Simulator/Cockpit/panel.cxx: Redefinition of default parameter
// Simulator/Flight/flight.cxx: Replaced cout with FG_LOG. Deleted <stdio.h>
// Simulator/Main/fg_init.cxx:
// Simulator/Main/GLUTmain.cxx:
// Simulator/Main/options.hxx: Shuffled <fg_serial.hxx> dependency
// Simulator/Objects/material.hxx:
// Simulator/Time/timestamp.hxx: VC++ friend kludge
// Simulator/Scenery/tile.[ch]xx: Fixed using std::X declarations
// Simulator/Main/views.hxx: Added a constant
//
// Revision 1.25 1998/12/09 18:50:15 curt
// Converted "class fgVIEW" to "class FGView" and updated to make data
// members private and make required accessor functions.
//
// Revision 1.24 1998/12/05 15:54:04 curt
// Renamed class fgFLIGHT to class FGState as per request by JSB.
//
// Revision 1.23 1998/11/23 21:48:28 curt
// Borland portability tweaks.
//
// Revision 1.22 1998/11/07 19:07:07 curt
// Enable release builds using the --without-logging option to the configure
// script. Also a couple log message cleanups, plus some C to C++ comment
// conversion.
//
// Revision 1.21 1998/11/06 21:17:42 curt
// Converted to new logstream debugging facility. This allows release
// builds with no messages at all (and no performance impact) by using
// the -DFG_NDEBUG flag.
//
// Revision 1.20 1998/11/06 14:47:02 curt
// Changes to track Bernie's updates to fgstream.
//
// Revision 1.19 1998/10/16 23:27:21 curt
// C++-ifying.
//
// Revision 1.18 1998/10/16 00:52:20 curt
// Converted to Point3D class.
//
// Revision 1.17 1998/09/24 15:36:19 curt
// Converted to c++ style comments.
//
// Revision 1.16 1998/09/24 15:25:24 curt
// Miscellaneous tweaks.
//
//
// Revision 1.15 1998/09/17 18:25:12 curt
// Fixed output message.
//
// Revision 1.14 1998/09/15 04:26:22 curt
// New textured moon and rewritten/restructured Astro code contributed by Durk
// Talsma.
//
// Revision 1.13 1998/09/01 19:03:04 curt
// Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
// - The new classes in libmisc.tgz define a stream interface into zlib.
// I've put these in a new directory, Lib/Misc. Feel free to rename it
// to something more appropriate. However you'll have to change the
// include directives in all the other files. Additionally you'll have
// add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
//
// The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
// test so I've included the required changes in config.tgz.
//
// There are a fair few changes to Simulator/Objects as I've moved
// things around. Loading tiles is quicker but thats not where the delay
// is. Tile loading takes a few tenths of a second per file on a P200
// but it seems to be the post-processing that leads to a noticeable
// blip in framerate. I suppose its time to start profiling to see where
// the delays are.
//
// I've included a brief description of each archives contents.
//
// Lib/Misc/
// zfstream.cxx
// zfstream.hxx
// C++ stream interface into zlib.
// Taken from zlib-1.1.3/contrib/iostream/.
// Minor mods for STL compatibility.
// There's no copyright associated with these so I assume they're
// covered by zlib's.
//
// fgstream.cxx
// fgstream.hxx
// FlightGear input stream using gz_ifstream. Tries to open the
// given filename. If that fails then filename is examined and a
// ".gz" suffix is removed or appended and that file is opened.
//
// stopwatch.hxx
// A simple timer for benchmarking. Not used in production code.
// Taken from the Blitz++ project. Covered by GPL.
//
// strutils.cxx
// strutils.hxx
// Some simple string manipulation routines.
//
// Simulator/Airports/
// Load airports database using fgstream.
// Changed fgAIRPORTS to use set<> instead of map<>.
// Added bool fgAIRPORTS::search() as a neater way doing the lookup.
// Returns true if found.
//
// Simulator/Astro/
// Modified fgStarsInit() to load stars database using fgstream.
//
// Simulator/Objects/
// Modified fgObjLoad() to use fgstream.
// Modified fgMATERIAL_MGR::load_lib() to use fgstream.
// Many changes to fgMATERIAL.
// Some changes to fgFRAGMENT but I forget what!
//
// Revision 1.12 1998/08/27 17:02:01 curt
// Contributions from Bernie Bright <bbright@c031.aone.net.au>
// - use strings for fg_root and airport_id and added methods to return
// them as strings,
// - inlined all access methods,
// - made the parsing functions private methods,
// - deleted some unused functions.
// - propogated some of these changes out a bit further.
//
// Revision 1.11 1998/08/25 20:53:29 curt
// Shuffled $FG_ROOT file layout.
//
// Revision 1.10 1998/08/10 20:33:09 curt
// Rewrote star loading and rendering to:
// 1. significantly improve load speed
// 2. transition from no stars to stars through eight stages.
//
// Revision 1.9 1998/08/06 12:45:20 curt
// Modified to bring in stars in 8 increments based on magnitude, not number
// of stars.
//
// Revision 1.8 1998/07/13 21:00:10 curt
// Wrote access functions for current fgOPTIONS.
//
// Revision 1.7 1998/05/29 20:35:42 curt
// Added zlib support for reading in compressed data files.
//
// Revision 1.6 1998/05/13 18:25:35 curt
// Root path info moved to fgOPTIONS.
//
// Revision 1.5 1998/04/28 01:19:03 curt
// Type-ified fgTIME and fgVIEW
//
// Revision 1.4 1998/04/26 05:10:02 curt
// "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
//
// Revision 1.3 1998/04/25 22:06:26 curt
// Edited cvs log messages in source files ... bad bad bad!
//
// Revision 1.2 1998/04/24 00:45:03 curt
// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
// Fixed a bug when generating sky colors.
//
// Revision 1.1 1998/04/22 13:21:34 curt
// C++ - ifing the code a bit.
//
// Revision 1.11 1998/04/18 04:13:58 curt
// Moved fg_debug.c to it's own library.
//
// Revision 1.10 1998/04/03 21:52:51 curt
// Converting to Gnu autoconf system.
//
// Revision 1.9 1998/03/14 00:27:12 curt
// Updated fgGENERAL to a "type" of struct.
//
// Revision 1.8 1998/02/12 21:59:38 curt
// Incorporated code changes contributed by Charlie Hotchkiss
// <chotchkiss@namg.us.anritsu.com>
//
// Revision 1.7 1998/02/09 15:07:48 curt
// Minor tweaks.
//
// Revision 1.6 1998/02/02 20:53:23 curt
// To version 0.29
//
// Revision 1.5 1998/01/27 18:35:53 curt
// Minor tweaks.
//
// Revision 1.4 1998/01/27 00:47:49 curt
// Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
// system and commandline/config file processing code.
//
// Revision 1.3 1998/01/19 19:26:59 curt
// Merged in make system changes from Bob Kuehne <rpk@sgi.com>
// This should simplify things tremendously.
//
// Revision 1.2 1998/01/19 18:40:18 curt
// Tons of little changes to clean up the code and to remove fatal errors
// when building with the c++ compiler.
//
// Revision 1.1 1998/01/07 03:16:20 curt
// Moved from .../Src/Scenery/ to .../Src/Astro/
//
// Revision 1.24 1997/12/30 22:22:39 curt
// Further integration of event manager.
//
// Revision 1.23 1997/12/30 20:47:53 curt
// Integrated new event manager with subsystem initializations.
//
// Revision 1.22 1997/12/30 16:36:53 curt
// Merged in Durk's changes ...
//
// Revision 1.21 1997/12/19 23:35:00 curt
// Lot's of tweaking with sky rendering and lighting.
//
// Revision 1.20 1997/12/15 23:55:03 curt
// Add xgl wrappers for debugging.
// Generate terrain normals on the fly.
//
// Revision 1.19 1997/12/12 19:53:00 curt
// Working on lightling and material properties.
//
// Revision 1.18 1997/12/10 22:37:52 curt
// Prepended "fg" on the name of all global structures that didn't have it yet.
// i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
//
// Revision 1.17 1997/12/09 04:25:33 curt
// Working on adding a global lighting params structure.
//
// Revision 1.16 1997/11/25 19:25:38 curt
// Changes to integrate Durk's moon/sun code updates + clean up.
//
// Revision 1.15 1997/10/30 12:38:45 curt
// Working on new scenery subsystem.
//
// Revision 1.14 1997/10/28 21:00:22 curt
// Changing to new terrain format.
//
// Revision 1.13 1997/10/25 03:18:28 curt
// Incorporated sun, moon, and planet position and rendering code contributed
// by Durk Talsma.
//
// Revision 1.12 1997/09/23 00:29:43 curt
// Tweaks to get things to compile with gcc-win32.
//
// Revision 1.11 1997/09/22 14:44:21 curt
// Continuing to try to align stars correctly.
//
// Revision 1.10 1997/09/20 03:34:32 curt
// Still trying to get those durned stars aligned properly.
//
// Revision 1.9 1997/09/18 16:20:09 curt
// At dusk/dawn add/remove stars in stages.
//
// Revision 1.8 1997/09/16 22:14:52 curt
// Tweaked time of day lighting equations. Don't draw stars during the day.
//
// Revision 1.7 1997/09/16 15:50:31 curt
// Working on star alignment and time issues.
//
// Revision 1.6 1997/09/05 14:17:31 curt
// More tweaking with stars.
//
// Revision 1.5 1997/09/05 01:35:59 curt
// Working on getting stars right.
//
// Revision 1.4 1997/09/04 02:17:38 curt
// Shufflin' stuff.
//
// Revision 1.3 1997/08/29 17:55:28 curt
// Worked on properly aligning the stars.
//
// Revision 1.2 1997/08/27 21:32:30 curt
// Restructured view calculation code. Added stars.
//
// Revision 1.1 1997/08/27 03:34:48 curt
// Initial revision.
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