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 //*************************************************************************/
43 #include <Aircraft/aircraft.hxx>
44 #include <Debug/logstream.hxx>
45 #include <Include/fg_constants.h>
46 #include <Misc/fgstream.hxx>
47 #include <Main/options.hxx>
48 #include <Main/views.hxx>
49 #include <Misc/stopwatch.hxx>
50 #include <Time/fg_time.hxx>
55 #define EpochStart (631065600)
56 #define DaysSinceEpoch(secs) (((secs)-EpochStart)*(1.0/(24*3600)))
57 #define FG_MAX_STARS 3500
59 // Define four structures, each with varying amounts of stars
60 static GLint stars[FG_STAR_LEVELS];
63 // Initialize the Star Management Subsystem
64 int fgStarsInit( void ) {
65 Point3D starlist[FG_MAX_STARS];
66 // struct CelestialCoord pltPos;
67 double right_ascension, declination, magnitude;
68 double min_magnitude[FG_STAR_LEVELS];
69 // double ra_save, decl_save;
70 // double ra_save1, decl_save1;
71 int i, j, starcount, count;
73 FG_LOG( FG_ASTRO, FG_INFO, "Initializing stars" );
75 if ( FG_STAR_LEVELS < 4 ) {
76 FG_LOG( FG_ASTRO, FG_ALERT, "Big whups in stars.cxx" );
80 // build the full path name to the stars data base file
81 string path = current_options.get_fg_root() + "/Astro/stars" + ".gz";
83 FG_LOG( FG_ASTRO, FG_INFO, " Loading stars from " << path );
85 fg_gzifstream in( path );
87 FG_LOG( FG_ASTRO, FG_ALERT, "Cannot open star file: " << path );
96 // read in each line of the file
97 while ( ! in.eof() && starcount < FG_MAX_STARS )
101 getline( in, name, ',' );
102 in >> starlist[starcount];
107 FG_LOG( FG_ASTRO, FG_INFO,
108 "Loaded " << starcount << " stars in "
109 << timer.elapsedSeconds() << " seconds" );
111 min_magnitude[0] = 4.2;
112 min_magnitude[1] = 3.6;
113 min_magnitude[2] = 3.0;
114 min_magnitude[3] = 2.4;
115 min_magnitude[4] = 1.8;
116 min_magnitude[5] = 1.2;
117 min_magnitude[6] = 0.6;
118 min_magnitude[7] = 0.0;
120 // build the various star display lists
121 for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
123 stars[i] = xglGenLists(1);
124 xglNewList( stars[i], GL_COMPILE );
125 xglBegin( GL_POINTS );
129 for ( j = 0; j < starcount; j++ ) {
130 magnitude = starlist[j].z();
131 // printf("magnitude = %.2f\n", magnitude);
133 if ( magnitude < min_magnitude[i] ) {
134 right_ascension = starlist[j].x();
135 declination = starlist[j].y();
139 // scale magnitudes to (0.0 - 1.0)
140 magnitude = (0.0 - magnitude) / 5.0 + 1.0;
142 // scale magnitudes again so they look ok
143 if ( magnitude > 1.0 ) { magnitude = 1.0; }
144 if ( magnitude < 0.0 ) { magnitude = 0.0; }
146 // magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
148 magnitude = magnitude * 0.9 +
149 (((FG_STAR_LEVELS - 1) - i) * 0.014);
150 // printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
151 // name, right_ascension, declination, magnitude);
153 xglColor3f( magnitude, magnitude, magnitude );
154 //xglColor3f(0,0,0);*/
155 xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
156 50000.0*sin(right_ascension)*cos(declination),
157 50000.0*sin(declination) );
164 xglBegin(GL_LINE_LOOP);
165 xglColor3f(1.0, 0.0, 0.0);
166 xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save-0.2),
167 50000.0 * sin(ra_save-0.2) * cos(decl_save-0.2),
168 50000.0 * sin(decl_save-0.2) );
169 xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save-0.2),
170 50000.0 * sin(ra_save+0.2) * cos(decl_save-0.2),
171 50000.0 * sin(decl_save-0.2) );
172 xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save+0.2),
173 50000.0 * sin(ra_save+0.2) * cos(decl_save+0.2),
174 50000.0 * sin(decl_save+0.2) );
175 xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save+0.2),
176 50000.0 * sin(ra_save-0.2) * cos(decl_save+0.2),
177 50000.0 * sin(decl_save+0.2) );
182 xglBegin(GL_LINE_LOOP);
183 xglColor3f(0.0, 1.0, 0.0);
184 xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1-0.2),
185 50000.0 * sin(ra_save1-0.2) * cos(decl_save1-0.2),
186 50000.0 * sin(decl_save1-0.2) );
187 xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1-0.2),
188 50000.0 * sin(ra_save1+0.2) * cos(decl_save1-0.2),
189 50000.0 * sin(decl_save1-0.2) );
190 xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1+0.2),
191 50000.0 * sin(ra_save1+0.2) * cos(decl_save1+0.2),
192 50000.0 * sin(decl_save1+0.2) );
193 xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1+0.2),
194 50000.0 * sin(ra_save1-0.2) * cos(decl_save1+0.2),
195 50000.0 * sin(decl_save1+0.2) );
201 FG_LOG( FG_ASTRO, FG_INFO,
202 " Loading " << count << " stars brighter than "
203 << min_magnitude[i] );
206 return 1; // OK, we got here because initialization worked.
211 void fgStarsRender( void ) {
218 f = current_aircraft.flight;
219 l = &cur_light_params;
220 t = &cur_time_params;
223 // FG_PI_2 + 0.1 is about 6 degrees after sundown and before sunrise
225 // t->sun_angle = 3.0; // to force stars to be drawn (for testing)
228 if ( l->sun_angle > (FG_PI_2 + 5 * DEG_TO_RAD ) ) {
229 // determine which star structure to draw
230 if ( l->sun_angle > (FG_PI_2 + 10.0 * DEG_TO_RAD ) ) {
232 } else if ( l->sun_angle > (FG_PI_2 + 8.8 * DEG_TO_RAD ) ) {
234 } else if ( l->sun_angle > (FG_PI_2 + 7.5 * DEG_TO_RAD ) ) {
236 } else if ( l->sun_angle > (FG_PI_2 + 7.0 * DEG_TO_RAD ) ) {
238 } else if ( l->sun_angle > (FG_PI_2 + 6.5 * DEG_TO_RAD ) ) {
240 } else if ( l->sun_angle > (FG_PI_2 + 6.0 * DEG_TO_RAD ) ) {
242 } else if ( l->sun_angle > (FG_PI_2 + 5.5 * DEG_TO_RAD ) ) {
248 // printf("RENDERING STARS = %d (night)\n", i);
250 xglCallList(stars[i]);
252 // printf("not RENDERING STARS (day)\n");
258 // Revision 1.22 1998/11/07 19:07:07 curt
259 // Enable release builds using the --without-logging option to the configure
260 // script. Also a couple log message cleanups, plus some C to C++ comment
263 // Revision 1.21 1998/11/06 21:17:42 curt
264 // Converted to new logstream debugging facility. This allows release
265 // builds with no messages at all (and no performance impact) by using
266 // the -DFG_NDEBUG flag.
268 // Revision 1.20 1998/11/06 14:47:02 curt
269 // Changes to track Bernie's updates to fgstream.
271 // Revision 1.19 1998/10/16 23:27:21 curt
274 // Revision 1.18 1998/10/16 00:52:20 curt
275 // Converted to Point3D class.
277 // Revision 1.17 1998/09/24 15:36:19 curt
278 // Converted to c++ style comments.
280 // Revision 1.16 1998/09/24 15:25:24 curt
281 // Miscellaneous tweaks.
284 // Revision 1.15 1998/09/17 18:25:12 curt
285 // Fixed output message.
287 // Revision 1.14 1998/09/15 04:26:22 curt
288 // New textured moon and rewritten/restructured Astro code contributed by Durk
291 // Revision 1.13 1998/09/01 19:03:04 curt
292 // Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
293 // - The new classes in libmisc.tgz define a stream interface into zlib.
294 // I've put these in a new directory, Lib/Misc. Feel free to rename it
295 // to something more appropriate. However you'll have to change the
296 // include directives in all the other files. Additionally you'll have
297 // add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
299 // The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
300 // test so I've included the required changes in config.tgz.
302 // There are a fair few changes to Simulator/Objects as I've moved
303 // things around. Loading tiles is quicker but thats not where the delay
304 // is. Tile loading takes a few tenths of a second per file on a P200
305 // but it seems to be the post-processing that leads to a noticeable
306 // blip in framerate. I suppose its time to start profiling to see where
309 // I've included a brief description of each archives contents.
314 // C++ stream interface into zlib.
315 // Taken from zlib-1.1.3/contrib/iostream/.
316 // Minor mods for STL compatibility.
317 // There's no copyright associated with these so I assume they're
318 // covered by zlib's.
322 // FlightGear input stream using gz_ifstream. Tries to open the
323 // given filename. If that fails then filename is examined and a
324 // ".gz" suffix is removed or appended and that file is opened.
327 // A simple timer for benchmarking. Not used in production code.
328 // Taken from the Blitz++ project. Covered by GPL.
332 // Some simple string manipulation routines.
334 // Simulator/Airports/
335 // Load airports database using fgstream.
336 // Changed fgAIRPORTS to use set<> instead of map<>.
337 // Added bool fgAIRPORTS::search() as a neater way doing the lookup.
338 // Returns true if found.
341 // Modified fgStarsInit() to load stars database using fgstream.
343 // Simulator/Objects/
344 // Modified fgObjLoad() to use fgstream.
345 // Modified fgMATERIAL_MGR::load_lib() to use fgstream.
346 // Many changes to fgMATERIAL.
347 // Some changes to fgFRAGMENT but I forget what!
349 // Revision 1.12 1998/08/27 17:02:01 curt
350 // Contributions from Bernie Bright <bbright@c031.aone.net.au>
351 // - use strings for fg_root and airport_id and added methods to return
353 // - inlined all access methods,
354 // - made the parsing functions private methods,
355 // - deleted some unused functions.
356 // - propogated some of these changes out a bit further.
358 // Revision 1.11 1998/08/25 20:53:29 curt
359 // Shuffled $FG_ROOT file layout.
361 // Revision 1.10 1998/08/10 20:33:09 curt
362 // Rewrote star loading and rendering to:
363 // 1. significantly improve load speed
364 // 2. transition from no stars to stars through eight stages.
366 // Revision 1.9 1998/08/06 12:45:20 curt
367 // Modified to bring in stars in 8 increments based on magnitude, not number
370 // Revision 1.8 1998/07/13 21:00:10 curt
371 // Wrote access functions for current fgOPTIONS.
373 // Revision 1.7 1998/05/29 20:35:42 curt
374 // Added zlib support for reading in compressed data files.
376 // Revision 1.6 1998/05/13 18:25:35 curt
377 // Root path info moved to fgOPTIONS.
379 // Revision 1.5 1998/04/28 01:19:03 curt
380 // Type-ified fgTIME and fgVIEW
382 // Revision 1.4 1998/04/26 05:10:02 curt
383 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
385 // Revision 1.3 1998/04/25 22:06:26 curt
386 // Edited cvs log messages in source files ... bad bad bad!
388 // Revision 1.2 1998/04/24 00:45:03 curt
389 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
390 // Fixed a bug when generating sky colors.
392 // Revision 1.1 1998/04/22 13:21:34 curt
393 // C++ - ifing the code a bit.
395 // Revision 1.11 1998/04/18 04:13:58 curt
396 // Moved fg_debug.c to it's own library.
398 // Revision 1.10 1998/04/03 21:52:51 curt
399 // Converting to Gnu autoconf system.
401 // Revision 1.9 1998/03/14 00:27:12 curt
402 // Updated fgGENERAL to a "type" of struct.
404 // Revision 1.8 1998/02/12 21:59:38 curt
405 // Incorporated code changes contributed by Charlie Hotchkiss
406 // <chotchkiss@namg.us.anritsu.com>
408 // Revision 1.7 1998/02/09 15:07:48 curt
411 // Revision 1.6 1998/02/02 20:53:23 curt
414 // Revision 1.5 1998/01/27 18:35:53 curt
417 // Revision 1.4 1998/01/27 00:47:49 curt
418 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
419 // system and commandline/config file processing code.
421 // Revision 1.3 1998/01/19 19:26:59 curt
422 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
423 // This should simplify things tremendously.
425 // Revision 1.2 1998/01/19 18:40:18 curt
426 // Tons of little changes to clean up the code and to remove fatal errors
427 // when building with the c++ compiler.
429 // Revision 1.1 1998/01/07 03:16:20 curt
430 // Moved from .../Src/Scenery/ to .../Src/Astro/
432 // Revision 1.24 1997/12/30 22:22:39 curt
433 // Further integration of event manager.
435 // Revision 1.23 1997/12/30 20:47:53 curt
436 // Integrated new event manager with subsystem initializations.
438 // Revision 1.22 1997/12/30 16:36:53 curt
439 // Merged in Durk's changes ...
441 // Revision 1.21 1997/12/19 23:35:00 curt
442 // Lot's of tweaking with sky rendering and lighting.
444 // Revision 1.20 1997/12/15 23:55:03 curt
445 // Add xgl wrappers for debugging.
446 // Generate terrain normals on the fly.
448 // Revision 1.19 1997/12/12 19:53:00 curt
449 // Working on lightling and material properties.
451 // Revision 1.18 1997/12/10 22:37:52 curt
452 // Prepended "fg" on the name of all global structures that didn't have it yet.
453 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
455 // Revision 1.17 1997/12/09 04:25:33 curt
456 // Working on adding a global lighting params structure.
458 // Revision 1.16 1997/11/25 19:25:38 curt
459 // Changes to integrate Durk's moon/sun code updates + clean up.
461 // Revision 1.15 1997/10/30 12:38:45 curt
462 // Working on new scenery subsystem.
464 // Revision 1.14 1997/10/28 21:00:22 curt
465 // Changing to new terrain format.
467 // Revision 1.13 1997/10/25 03:18:28 curt
468 // Incorporated sun, moon, and planet position and rendering code contributed
471 // Revision 1.12 1997/09/23 00:29:43 curt
472 // Tweaks to get things to compile with gcc-win32.
474 // Revision 1.11 1997/09/22 14:44:21 curt
475 // Continuing to try to align stars correctly.
477 // Revision 1.10 1997/09/20 03:34:32 curt
478 // Still trying to get those durned stars aligned properly.
480 // Revision 1.9 1997/09/18 16:20:09 curt
481 // At dusk/dawn add/remove stars in stages.
483 // Revision 1.8 1997/09/16 22:14:52 curt
484 // Tweaked time of day lighting equations. Don't draw stars during the day.
486 // Revision 1.7 1997/09/16 15:50:31 curt
487 // Working on star alignment and time issues.
489 // Revision 1.6 1997/09/05 14:17:31 curt
490 // More tweaking with stars.
492 // Revision 1.5 1997/09/05 01:35:59 curt
493 // Working on getting stars right.
495 // Revision 1.4 1997/09/04 02:17:38 curt
498 // Revision 1.3 1997/08/29 17:55:28 curt
499 // Worked on properly aligning the stars.
501 // Revision 1.2 1997/08/27 21:32:30 curt
502 // Restructured view calculation code. Added stars.
504 // Revision 1.1 1997/08/27 03:34:48 curt