// 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 <math.h> #include <stdio.h> #include <string.h> #include <string> #include <time.h> #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 "stars.hxx" #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 ) { fgFLIGHT *f; fgVIEW *v; fgLIGHT *l; fgTIME *t; int i; f = current_aircraft.flight; l = &cur_light_params; t = &cur_time_params; v = ¤t_view; // 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 1.22 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.