1 /**************************************************************************
2 * stars.c -- data structures and routines for managing and rendering stars.
4 * Written by Curtis Olson, started August 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
44 #include <Aircraft/aircraft.h>
45 #include <Debug/fg_debug.h>
46 #include <Include/fg_constants.h>
47 #include <Include/fg_types.h>
48 #include "Misc/fgstream.hxx"
49 #include <Main/options.hxx>
50 #include <Main/views.hxx>
51 #include <Misc/stopwatch.hxx>
52 #include <Time/fg_time.hxx>
55 #include "planets.hxx"
59 #define EpochStart (631065600)
60 #define DaysSinceEpoch(secs) (((secs)-EpochStart)*(1.0/(24*3600)))
61 #define FG_MAX_STARS 3500
63 /* Define four structures, each with varying amounts of stars */
64 static GLint stars[FG_STAR_LEVELS];
67 /* Initialize the Star Management Subsystem */
68 int fgStarsInit( void ) {
69 fgPoint3d starlist[FG_MAX_STARS];
70 /* struct CelestialCoord pltPos; */
71 double right_ascension, declination, magnitude;
72 double min_magnitude[FG_STAR_LEVELS];
73 /* double ra_save, decl_save; */
74 /* double ra_save1, decl_save1; */
75 int i, j, starcount, count;
77 fgPrintf( FG_ASTRO, FG_INFO, "Initializing stars\n");
79 if ( FG_STAR_LEVELS < 4 ) {
80 fgPrintf( FG_ASTRO, FG_EXIT, "Big whups in stars.cxx\n");
83 // build the full path name to the stars data base file
84 string path = current_options.get_fg_root() + "/Astro/stars" + ".gz";
86 fgPrintf( FG_ASTRO, FG_INFO, " Loading stars from %s\n", path.c_str() );
88 fg_gzifstream in( path );
90 fgPrintf( FG_ASTRO, FG_EXIT,
91 "Cannot open star file: '%s'\n", path.c_str() );
98 // read in each line of the file
99 while ( ! in.eof() && starcount < FG_MAX_STARS )
104 getline( in.stream(), name, ',' );
105 in.stream() >> starlist[starcount].x >> c;
106 in.stream() >> starlist[starcount].y >> c;
107 // in.stream() >> starlist[starcount].x; in.get(c);
108 // in.stream() >> starlist[starcount].y; in.get(c);
109 in.stream() >> starlist[starcount].z;
114 cerr << "Loaded " << starcount << " stars in "
115 << timer.elapsedSeconds() << " seconds" << endl;
117 min_magnitude[0] = 4.2;
118 min_magnitude[1] = 3.6;
119 min_magnitude[2] = 3.0;
120 min_magnitude[3] = 2.4;
121 min_magnitude[4] = 1.8;
122 min_magnitude[5] = 1.2;
123 min_magnitude[6] = 0.6;
124 min_magnitude[7] = 0.0;
126 // build the various star display lists
127 for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
129 stars[i] = xglGenLists(1);
130 xglNewList( stars[i], GL_COMPILE );
131 xglBegin( GL_POINTS );
135 for ( j = 0; j < starcount; j++ ) {
136 magnitude = starlist[j].z;
137 // printf("magnitude = %.2f\n", magnitude);
139 if ( magnitude < min_magnitude[i] ) {
140 right_ascension = starlist[j].x;
141 declination = starlist[j].y;
145 /* scale magnitudes to (0.0 - 1.0) */
146 magnitude = (0.0 - magnitude) / 5.0 + 1.0;
148 /* scale magnitudes again so they look ok */
149 if ( magnitude > 1.0 ) { magnitude = 1.0; }
150 if ( magnitude < 0.0 ) { magnitude = 0.0; }
152 magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
154 magnitude = magnitude * 0.9 +
155 (((FG_STAR_LEVELS - 1) - i) * 0.014);
156 /* printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
157 name, right_ascension, declination, magnitude); */
159 xglColor3f( magnitude, magnitude, magnitude );
160 /*xglColor3f(0,0,0);*/
161 xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
162 50000.0*sin(right_ascension)*cos(declination),
163 50000.0*sin(declination) );
170 xglBegin(GL_LINE_LOOP);
171 xglColor3f(1.0, 0.0, 0.0);
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) );
178 xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save+0.2),
179 50000.0 * sin(ra_save+0.2) * cos(decl_save+0.2),
180 50000.0 * sin(decl_save+0.2) );
181 xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save+0.2),
182 50000.0 * sin(ra_save-0.2) * cos(decl_save+0.2),
183 50000.0 * sin(decl_save+0.2) );
188 xglBegin(GL_LINE_LOOP);
189 xglColor3f(0.0, 1.0, 0.0);
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) );
196 xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1+0.2),
197 50000.0 * sin(ra_save1+0.2) * cos(decl_save1+0.2),
198 50000.0 * sin(decl_save1+0.2) );
199 xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1+0.2),
200 50000.0 * sin(ra_save1-0.2) * cos(decl_save1+0.2),
201 50000.0 * sin(decl_save1+0.2) );
207 fgPrintf( FG_ASTRO, FG_INFO,
208 " Loading %d stars brighter than %.2f\n",
209 count, min_magnitude[i]);
212 return 1; // OK, we got here because initialization worked.
217 void fgStarsRender( void ) {
224 f = current_aircraft.flight;
225 l = &cur_light_params;
226 t = &cur_time_params;
229 /* FG_PI_2 + 0.1 is about 6 degrees after sundown and before sunrise */
231 /* t->sun_angle = 3.0; */ /* to force stars to be drawn (for testing) */
233 /* render the stars */
234 if ( l->sun_angle > (FG_PI_2 + 5 * DEG_TO_RAD ) ) {
235 /* determine which star structure to draw */
236 if ( l->sun_angle > (FG_PI_2 + 10.0 * DEG_TO_RAD ) ) {
238 } else if ( l->sun_angle > (FG_PI_2 + 8.8 * DEG_TO_RAD ) ) {
240 } else if ( l->sun_angle > (FG_PI_2 + 7.5 * DEG_TO_RAD ) ) {
242 } else if ( l->sun_angle > (FG_PI_2 + 7.0 * DEG_TO_RAD ) ) {
244 } else if ( l->sun_angle > (FG_PI_2 + 6.5 * DEG_TO_RAD ) ) {
246 } else if ( l->sun_angle > (FG_PI_2 + 6.0 * DEG_TO_RAD ) ) {
248 } else if ( l->sun_angle > (FG_PI_2 + 5.5 * DEG_TO_RAD ) ) {
254 /* printf("RENDERING STARS = %d (night)\n", i); */
256 xglCallList(stars[i]);
258 /* printf("not RENDERING STARS (day)\n"); */
264 /* Revision 1.13 1998/09/01 19:03:04 curt
265 /* Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
266 /* - The new classes in libmisc.tgz define a stream interface into zlib.
267 /* I've put these in a new directory, Lib/Misc. Feel free to rename it
268 /* to something more appropriate. However you'll have to change the
269 /* include directives in all the other files. Additionally you'll have
270 /* add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
272 /* The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
273 /* test so I've included the required changes in config.tgz.
275 /* There are a fair few changes to Simulator/Objects as I've moved
276 /* things around. Loading tiles is quicker but thats not where the delay
277 /* is. Tile loading takes a few tenths of a second per file on a P200
278 /* but it seems to be the post-processing that leads to a noticeable
279 /* blip in framerate. I suppose its time to start profiling to see where
282 /* I've included a brief description of each archives contents.
287 /* C++ stream interface into zlib.
288 /* Taken from zlib-1.1.3/contrib/iostream/.
289 /* Minor mods for STL compatibility.
290 /* There's no copyright associated with these so I assume they're
291 /* covered by zlib's.
295 /* FlightGear input stream using gz_ifstream. Tries to open the
296 /* given filename. If that fails then filename is examined and a
297 /* ".gz" suffix is removed or appended and that file is opened.
300 /* A simple timer for benchmarking. Not used in production code.
301 /* Taken from the Blitz++ project. Covered by GPL.
305 /* Some simple string manipulation routines.
307 /* Simulator/Airports/
308 /* Load airports database using fgstream.
309 /* Changed fgAIRPORTS to use set<> instead of map<>.
310 /* Added bool fgAIRPORTS::search() as a neater way doing the lookup.
311 /* Returns true if found.
314 /* Modified fgStarsInit() to load stars database using fgstream.
316 /* Simulator/Objects/
317 /* Modified fgObjLoad() to use fgstream.
318 /* Modified fgMATERIAL_MGR::load_lib() to use fgstream.
319 /* Many changes to fgMATERIAL.
320 /* Some changes to fgFRAGMENT but I forget what!
322 * Revision 1.12 1998/08/27 17:02:01 curt
323 * Contributions from Bernie Bright <bbright@c031.aone.net.au>
324 * - use strings for fg_root and airport_id and added methods to return
326 * - inlined all access methods,
327 * - made the parsing functions private methods,
328 * - deleted some unused functions.
329 * - propogated some of these changes out a bit further.
331 * Revision 1.11 1998/08/25 20:53:29 curt
332 * Shuffled $FG_ROOT file layout.
334 * Revision 1.10 1998/08/10 20:33:09 curt
335 * Rewrote star loading and rendering to:
336 * 1. significantly improve load speed
337 * 2. transition from no stars to stars through eight stages.
339 * Revision 1.9 1998/08/06 12:45:20 curt
340 * Modified to bring in stars in 8 increments based on magnitude, not number
343 * Revision 1.8 1998/07/13 21:00:10 curt
344 * Wrote access functions for current fgOPTIONS.
346 * Revision 1.7 1998/05/29 20:35:42 curt
347 * Added zlib support for reading in compressed data files.
349 * Revision 1.6 1998/05/13 18:25:35 curt
350 * Root path info moved to fgOPTIONS.
352 * Revision 1.5 1998/04/28 01:19:03 curt
353 * Type-ified fgTIME and fgVIEW
355 * Revision 1.4 1998/04/26 05:10:02 curt
356 * "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
358 * Revision 1.3 1998/04/25 22:06:26 curt
359 * Edited cvs log messages in source files ... bad bad bad!
361 * Revision 1.2 1998/04/24 00:45:03 curt
362 * Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
363 * Fixed a bug when generating sky colors.
365 * Revision 1.1 1998/04/22 13:21:34 curt
366 * C++ - ifing the code a bit.
368 * Revision 1.11 1998/04/18 04:13:58 curt
369 * Moved fg_debug.c to it's own library.
371 * Revision 1.10 1998/04/03 21:52:51 curt
372 * Converting to Gnu autoconf system.
374 * Revision 1.9 1998/03/14 00:27:12 curt
375 * Updated fgGENERAL to a "type" of struct.
377 * Revision 1.8 1998/02/12 21:59:38 curt
378 * Incorporated code changes contributed by Charlie Hotchkiss
379 * <chotchkiss@namg.us.anritsu.com>
381 * Revision 1.7 1998/02/09 15:07:48 curt
384 * Revision 1.6 1998/02/02 20:53:23 curt
387 * Revision 1.5 1998/01/27 18:35:53 curt
390 * Revision 1.4 1998/01/27 00:47:49 curt
391 * Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
392 * system and commandline/config file processing code.
394 * Revision 1.3 1998/01/19 19:26:59 curt
395 * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
396 * This should simplify things tremendously.
398 * Revision 1.2 1998/01/19 18:40:18 curt
399 * Tons of little changes to clean up the code and to remove fatal errors
400 * when building with the c++ compiler.
402 * Revision 1.1 1998/01/07 03:16:20 curt
403 * Moved from .../Src/Scenery/ to .../Src/Astro/
405 * Revision 1.24 1997/12/30 22:22:39 curt
406 * Further integration of event manager.
408 * Revision 1.23 1997/12/30 20:47:53 curt
409 * Integrated new event manager with subsystem initializations.
411 * Revision 1.22 1997/12/30 16:36:53 curt
412 * Merged in Durk's changes ...
414 * Revision 1.21 1997/12/19 23:35:00 curt
415 * Lot's of tweaking with sky rendering and lighting.
417 * Revision 1.20 1997/12/15 23:55:03 curt
418 * Add xgl wrappers for debugging.
419 * Generate terrain normals on the fly.
421 * Revision 1.19 1997/12/12 19:53:00 curt
422 * Working on lightling and material properties.
424 * Revision 1.18 1997/12/10 22:37:52 curt
425 * Prepended "fg" on the name of all global structures that didn't have it yet.
426 * i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
428 * Revision 1.17 1997/12/09 04:25:33 curt
429 * Working on adding a global lighting params structure.
431 * Revision 1.16 1997/11/25 19:25:38 curt
432 * Changes to integrate Durk's moon/sun code updates + clean up.
434 * Revision 1.15 1997/10/30 12:38:45 curt
435 * Working on new scenery subsystem.
437 * Revision 1.14 1997/10/28 21:00:22 curt
438 * Changing to new terrain format.
440 * Revision 1.13 1997/10/25 03:18:28 curt
441 * Incorporated sun, moon, and planet position and rendering code contributed
444 * Revision 1.12 1997/09/23 00:29:43 curt
445 * Tweaks to get things to compile with gcc-win32.
447 * Revision 1.11 1997/09/22 14:44:21 curt
448 * Continuing to try to align stars correctly.
450 * Revision 1.10 1997/09/20 03:34:32 curt
451 * Still trying to get those durned stars aligned properly.
453 * Revision 1.9 1997/09/18 16:20:09 curt
454 * At dusk/dawn add/remove stars in stages.
456 * Revision 1.8 1997/09/16 22:14:52 curt
457 * Tweaked time of day lighting equations. Don't draw stars during the day.
459 * Revision 1.7 1997/09/16 15:50:31 curt
460 * Working on star alignment and time issues.
462 * Revision 1.6 1997/09/05 14:17:31 curt
463 * More tweaking with stars.
465 * Revision 1.5 1997/09/05 01:35:59 curt
466 * Working on getting stars right.
468 * Revision 1.4 1997/09/04 02:17:38 curt
471 * Revision 1.3 1997/08/29 17:55:28 curt
472 * Worked on properly aligning the stars.
474 * Revision 1.2 1997/08/27 21:32:30 curt
475 * Restructured view calculation code. Added stars.
477 * Revision 1.1 1997/08/27 03:34:48 curt