1 // stars.cxx -- data structures and routines for managing and rendering stars.
3 // Written by Curtis Olson, started August 1997.
5 // Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 // (Log is kept at end of this file)
23 //*************************************************************************/
44 #include <Aircraft/aircraft.hxx>
45 #include <Debug/logstream.hxx>
46 #include <Include/fg_constants.h>
47 #include <Misc/fgstream.hxx>
48 #include <Main/options.hxx>
49 #include <Main/views.hxx>
50 #include <Misc/stopwatch.hxx>
51 #include <Time/fg_time.hxx>
56 #define EpochStart (631065600)
57 #define DaysSinceEpoch(secs) (((secs)-EpochStart)*(1.0/(24*3600)))
58 #define FG_MAX_STARS 3500
60 // Define four structures, each with varying amounts of stars
61 static GLint stars[FG_STAR_LEVELS];
64 // Initialize the Star Management Subsystem
65 int fgStarsInit( void ) {
66 Point3D starlist[FG_MAX_STARS];
67 // struct CelestialCoord pltPos;
68 double right_ascension, declination, magnitude;
69 double min_magnitude[FG_STAR_LEVELS];
70 // double ra_save, decl_save;
71 // double ra_save1, decl_save1;
72 int i, j, starcount, count;
74 FG_LOG( FG_ASTRO, FG_INFO, "Initializing stars" );
76 if ( FG_STAR_LEVELS < 4 ) {
77 FG_LOG( FG_ASTRO, FG_ALERT, "Big whups in stars.cxx" );
81 // build the full path name to the stars data base file
82 string path = current_options.get_fg_root() + "/Astro/stars" + ".gz";
84 FG_LOG( FG_ASTRO, FG_INFO, " Loading stars from " << path );
86 fg_gzifstream in( path );
88 FG_LOG( FG_ASTRO, FG_ALERT, "Cannot open star file: " << path );
97 // read in each line of the file
98 while ( ! in.eof() && starcount < FG_MAX_STARS )
102 getline( in, name, ',' );
103 in >> starlist[starcount];
108 FG_LOG( FG_ASTRO, FG_INFO,
109 "Loaded " << starcount << " stars in "
110 << timer.elapsedSeconds() << " seconds" );
112 min_magnitude[0] = 4.2;
113 min_magnitude[1] = 3.6;
114 min_magnitude[2] = 3.0;
115 min_magnitude[3] = 2.4;
116 min_magnitude[4] = 1.8;
117 min_magnitude[5] = 1.2;
118 min_magnitude[6] = 0.6;
119 min_magnitude[7] = 0.0;
121 // build the various star display lists
122 for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
124 stars[i] = xglGenLists(1);
125 xglNewList( stars[i], GL_COMPILE );
126 xglBegin( GL_POINTS );
130 for ( j = 0; j < starcount; j++ ) {
131 magnitude = starlist[j].z();
132 // printf("magnitude = %.2f\n", magnitude);
134 if ( magnitude < min_magnitude[i] ) {
135 right_ascension = starlist[j].x();
136 declination = starlist[j].y();
140 // scale magnitudes to (0.0 - 1.0)
141 magnitude = (0.0 - magnitude) / 5.0 + 1.0;
143 // scale magnitudes again so they look ok
144 if ( magnitude > 1.0 ) { magnitude = 1.0; }
145 if ( magnitude < 0.0 ) { magnitude = 0.0; }
147 // magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
149 magnitude = magnitude * 0.9 +
150 (((FG_STAR_LEVELS - 1) - i) * 0.014);
151 // printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
152 // name, right_ascension, declination, magnitude);
154 xglColor3f( magnitude, magnitude, magnitude );
155 //xglColor3f(0,0,0);*/
156 xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
157 50000.0*sin(right_ascension)*cos(declination),
158 50000.0*sin(declination) );
165 xglBegin(GL_LINE_LOOP);
166 xglColor3f(1.0, 0.0, 0.0);
167 xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save-0.2),
168 50000.0 * sin(ra_save-0.2) * cos(decl_save-0.2),
169 50000.0 * sin(decl_save-0.2) );
170 xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save-0.2),
171 50000.0 * sin(ra_save+0.2) * cos(decl_save-0.2),
172 50000.0 * sin(decl_save-0.2) );
173 xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save+0.2),
174 50000.0 * sin(ra_save+0.2) * cos(decl_save+0.2),
175 50000.0 * sin(decl_save+0.2) );
176 xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save+0.2),
177 50000.0 * sin(ra_save-0.2) * cos(decl_save+0.2),
178 50000.0 * sin(decl_save+0.2) );
183 xglBegin(GL_LINE_LOOP);
184 xglColor3f(0.0, 1.0, 0.0);
185 xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1-0.2),
186 50000.0 * sin(ra_save1-0.2) * cos(decl_save1-0.2),
187 50000.0 * sin(decl_save1-0.2) );
188 xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1-0.2),
189 50000.0 * sin(ra_save1+0.2) * cos(decl_save1-0.2),
190 50000.0 * sin(decl_save1-0.2) );
191 xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1+0.2),
192 50000.0 * sin(ra_save1+0.2) * cos(decl_save1+0.2),
193 50000.0 * sin(decl_save1+0.2) );
194 xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1+0.2),
195 50000.0 * sin(ra_save1-0.2) * cos(decl_save1+0.2),
196 50000.0 * sin(decl_save1+0.2) );
202 FG_LOG( FG_ASTRO, FG_INFO,
203 " Loading " << count << " stars brighter than "
204 << min_magnitude[i] );
207 return 1; // OK, we got here because initialization worked.
212 void fgStarsRender( void ) {
218 f = current_aircraft.fdm_state;
219 l = &cur_light_params;
220 t = &cur_time_params;
222 // FG_PI_2 + 0.1 is about 6 degrees after sundown and before sunrise
224 // t->sun_angle = 3.0; // to force stars to be drawn (for testing)
227 if ( l->sun_angle > (FG_PI_2 + 5 * DEG_TO_RAD ) ) {
228 // determine which star structure to draw
229 if ( l->sun_angle > (FG_PI_2 + 10.0 * DEG_TO_RAD ) ) {
231 } else if ( l->sun_angle > (FG_PI_2 + 8.8 * DEG_TO_RAD ) ) {
233 } else if ( l->sun_angle > (FG_PI_2 + 7.5 * DEG_TO_RAD ) ) {
235 } else if ( l->sun_angle > (FG_PI_2 + 7.0 * DEG_TO_RAD ) ) {
237 } else if ( l->sun_angle > (FG_PI_2 + 6.5 * DEG_TO_RAD ) ) {
239 } else if ( l->sun_angle > (FG_PI_2 + 6.0 * DEG_TO_RAD ) ) {
241 } else if ( l->sun_angle > (FG_PI_2 + 5.5 * DEG_TO_RAD ) ) {
247 // printf("RENDERING STARS = %d (night)\n", i);
249 xglCallList(stars[i]);
251 // printf("not RENDERING STARS (day)\n");
257 // Revision 1.25 1998/12/09 18:50:15 curt
258 // Converted "class fgVIEW" to "class FGView" and updated to make data
259 // members private and make required accessor functions.
261 // Revision 1.24 1998/12/05 15:54:04 curt
262 // Renamed class fgFLIGHT to class FGState as per request by JSB.
264 // Revision 1.23 1998/11/23 21:48:28 curt
265 // Borland portability tweaks.
267 // Revision 1.22 1998/11/07 19:07:07 curt
268 // Enable release builds using the --without-logging option to the configure
269 // script. Also a couple log message cleanups, plus some C to C++ comment
272 // Revision 1.21 1998/11/06 21:17:42 curt
273 // Converted to new logstream debugging facility. This allows release
274 // builds with no messages at all (and no performance impact) by using
275 // the -DFG_NDEBUG flag.
277 // Revision 1.20 1998/11/06 14:47:02 curt
278 // Changes to track Bernie's updates to fgstream.
280 // Revision 1.19 1998/10/16 23:27:21 curt
283 // Revision 1.18 1998/10/16 00:52:20 curt
284 // Converted to Point3D class.
286 // Revision 1.17 1998/09/24 15:36:19 curt
287 // Converted to c++ style comments.
289 // Revision 1.16 1998/09/24 15:25:24 curt
290 // Miscellaneous tweaks.
293 // Revision 1.15 1998/09/17 18:25:12 curt
294 // Fixed output message.
296 // Revision 1.14 1998/09/15 04:26:22 curt
297 // New textured moon and rewritten/restructured Astro code contributed by Durk
300 // Revision 1.13 1998/09/01 19:03:04 curt
301 // Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
302 // - The new classes in libmisc.tgz define a stream interface into zlib.
303 // I've put these in a new directory, Lib/Misc. Feel free to rename it
304 // to something more appropriate. However you'll have to change the
305 // include directives in all the other files. Additionally you'll have
306 // add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
308 // The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
309 // test so I've included the required changes in config.tgz.
311 // There are a fair few changes to Simulator/Objects as I've moved
312 // things around. Loading tiles is quicker but thats not where the delay
313 // is. Tile loading takes a few tenths of a second per file on a P200
314 // but it seems to be the post-processing that leads to a noticeable
315 // blip in framerate. I suppose its time to start profiling to see where
318 // I've included a brief description of each archives contents.
323 // C++ stream interface into zlib.
324 // Taken from zlib-1.1.3/contrib/iostream/.
325 // Minor mods for STL compatibility.
326 // There's no copyright associated with these so I assume they're
327 // covered by zlib's.
331 // FlightGear input stream using gz_ifstream. Tries to open the
332 // given filename. If that fails then filename is examined and a
333 // ".gz" suffix is removed or appended and that file is opened.
336 // A simple timer for benchmarking. Not used in production code.
337 // Taken from the Blitz++ project. Covered by GPL.
341 // Some simple string manipulation routines.
343 // Simulator/Airports/
344 // Load airports database using fgstream.
345 // Changed fgAIRPORTS to use set<> instead of map<>.
346 // Added bool fgAIRPORTS::search() as a neater way doing the lookup.
347 // Returns true if found.
350 // Modified fgStarsInit() to load stars database using fgstream.
352 // Simulator/Objects/
353 // Modified fgObjLoad() to use fgstream.
354 // Modified fgMATERIAL_MGR::load_lib() to use fgstream.
355 // Many changes to fgMATERIAL.
356 // Some changes to fgFRAGMENT but I forget what!
358 // Revision 1.12 1998/08/27 17:02:01 curt
359 // Contributions from Bernie Bright <bbright@c031.aone.net.au>
360 // - use strings for fg_root and airport_id and added methods to return
362 // - inlined all access methods,
363 // - made the parsing functions private methods,
364 // - deleted some unused functions.
365 // - propogated some of these changes out a bit further.
367 // Revision 1.11 1998/08/25 20:53:29 curt
368 // Shuffled $FG_ROOT file layout.
370 // Revision 1.10 1998/08/10 20:33:09 curt
371 // Rewrote star loading and rendering to:
372 // 1. significantly improve load speed
373 // 2. transition from no stars to stars through eight stages.
375 // Revision 1.9 1998/08/06 12:45:20 curt
376 // Modified to bring in stars in 8 increments based on magnitude, not number
379 // Revision 1.8 1998/07/13 21:00:10 curt
380 // Wrote access functions for current fgOPTIONS.
382 // Revision 1.7 1998/05/29 20:35:42 curt
383 // Added zlib support for reading in compressed data files.
385 // Revision 1.6 1998/05/13 18:25:35 curt
386 // Root path info moved to fgOPTIONS.
388 // Revision 1.5 1998/04/28 01:19:03 curt
389 // Type-ified fgTIME and fgVIEW
391 // Revision 1.4 1998/04/26 05:10:02 curt
392 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
394 // Revision 1.3 1998/04/25 22:06:26 curt
395 // Edited cvs log messages in source files ... bad bad bad!
397 // Revision 1.2 1998/04/24 00:45:03 curt
398 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
399 // Fixed a bug when generating sky colors.
401 // Revision 1.1 1998/04/22 13:21:34 curt
402 // C++ - ifing the code a bit.
404 // Revision 1.11 1998/04/18 04:13:58 curt
405 // Moved fg_debug.c to it's own library.
407 // Revision 1.10 1998/04/03 21:52:51 curt
408 // Converting to Gnu autoconf system.
410 // Revision 1.9 1998/03/14 00:27:12 curt
411 // Updated fgGENERAL to a "type" of struct.
413 // Revision 1.8 1998/02/12 21:59:38 curt
414 // Incorporated code changes contributed by Charlie Hotchkiss
415 // <chotchkiss@namg.us.anritsu.com>
417 // Revision 1.7 1998/02/09 15:07:48 curt
420 // Revision 1.6 1998/02/02 20:53:23 curt
423 // Revision 1.5 1998/01/27 18:35:53 curt
426 // Revision 1.4 1998/01/27 00:47:49 curt
427 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
428 // system and commandline/config file processing code.
430 // Revision 1.3 1998/01/19 19:26:59 curt
431 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
432 // This should simplify things tremendously.
434 // Revision 1.2 1998/01/19 18:40:18 curt
435 // Tons of little changes to clean up the code and to remove fatal errors
436 // when building with the c++ compiler.
438 // Revision 1.1 1998/01/07 03:16:20 curt
439 // Moved from .../Src/Scenery/ to .../Src/Astro/
441 // Revision 1.24 1997/12/30 22:22:39 curt
442 // Further integration of event manager.
444 // Revision 1.23 1997/12/30 20:47:53 curt
445 // Integrated new event manager with subsystem initializations.
447 // Revision 1.22 1997/12/30 16:36:53 curt
448 // Merged in Durk's changes ...
450 // Revision 1.21 1997/12/19 23:35:00 curt
451 // Lot's of tweaking with sky rendering and lighting.
453 // Revision 1.20 1997/12/15 23:55:03 curt
454 // Add xgl wrappers for debugging.
455 // Generate terrain normals on the fly.
457 // Revision 1.19 1997/12/12 19:53:00 curt
458 // Working on lightling and material properties.
460 // Revision 1.18 1997/12/10 22:37:52 curt
461 // Prepended "fg" on the name of all global structures that didn't have it yet.
462 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
464 // Revision 1.17 1997/12/09 04:25:33 curt
465 // Working on adding a global lighting params structure.
467 // Revision 1.16 1997/11/25 19:25:38 curt
468 // Changes to integrate Durk's moon/sun code updates + clean up.
470 // Revision 1.15 1997/10/30 12:38:45 curt
471 // Working on new scenery subsystem.
473 // Revision 1.14 1997/10/28 21:00:22 curt
474 // Changing to new terrain format.
476 // Revision 1.13 1997/10/25 03:18:28 curt
477 // Incorporated sun, moon, and planet position and rendering code contributed
480 // Revision 1.12 1997/09/23 00:29:43 curt
481 // Tweaks to get things to compile with gcc-win32.
483 // Revision 1.11 1997/09/22 14:44:21 curt
484 // Continuing to try to align stars correctly.
486 // Revision 1.10 1997/09/20 03:34:32 curt
487 // Still trying to get those durned stars aligned properly.
489 // Revision 1.9 1997/09/18 16:20:09 curt
490 // At dusk/dawn add/remove stars in stages.
492 // Revision 1.8 1997/09/16 22:14:52 curt
493 // Tweaked time of day lighting equations. Don't draw stars during the day.
495 // Revision 1.7 1997/09/16 15:50:31 curt
496 // Working on star alignment and time issues.
498 // Revision 1.6 1997/09/05 14:17:31 curt
499 // More tweaking with stars.
501 // Revision 1.5 1997/09/05 01:35:59 curt
502 // Working on getting stars right.
504 // Revision 1.4 1997/09/04 02:17:38 curt
507 // Revision 1.3 1997/08/29 17:55:28 curt
508 // Worked on properly aligning the stars.
510 // Revision 1.2 1997/08/27 21:32:30 curt
511 // Restructured view calculation code. Added stars.
513 // Revision 1.1 1997/08/27 03:34:48 curt