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 //*************************************************************************/
34 #include "Include/compiler.h"
35 #ifdef FG_HAVE_STD_INCLUDES
52 #include <Aircraft/aircraft.hxx>
53 #include <Debug/logstream.hxx>
54 #include <Include/fg_constants.h>
55 #include <Misc/fgstream.hxx>
56 #include <Main/options.hxx>
57 #include <Main/views.hxx>
58 #include <Misc/stopwatch.hxx>
59 #include <Time/fg_time.hxx>
60 #include "Misc/stopwatch.hxx"
64 FG_USING_STD(getline);
66 #define EpochStart (631065600)
67 #define DaysSinceEpoch(secs) (((secs)-EpochStart)*(1.0/(24*3600)))
68 #define FG_MAX_STARS 3500
70 // Define four structures, each with varying amounts of stars
71 static GLint stars[FG_STAR_LEVELS];
74 // Initialize the Star Management Subsystem
75 int fgStarsInit( void ) {
76 Point3D starlist[FG_MAX_STARS];
77 // struct CelestialCoord pltPos;
78 double right_ascension, declination, magnitude;
79 double min_magnitude[FG_STAR_LEVELS];
80 // double ra_save, decl_save;
81 // double ra_save1, decl_save1;
82 int i, j, starcount, count;
84 FG_LOG( FG_ASTRO, FG_INFO, "Initializing stars" );
86 if ( FG_STAR_LEVELS < 4 ) {
87 FG_LOG( FG_ASTRO, FG_ALERT, "Big whups in stars.cxx" );
91 // build the full path name to the stars data base file
92 string path = current_options.get_fg_root() + "/Astro/stars" + ".gz";
94 FG_LOG( FG_ASTRO, FG_INFO, " Loading stars from " << path );
96 fg_gzifstream in( path );
98 FG_LOG( FG_ASTRO, FG_ALERT, "Cannot open star file: " << path );
107 // read in each line of the file
108 while ( ! in.eof() && starcount < FG_MAX_STARS )
112 getline( in, name, ',' );
113 in >> starlist[starcount];
118 FG_LOG( FG_ASTRO, FG_INFO,
119 "Loaded " << starcount << " stars in "
120 << timer.elapsedSeconds() << " seconds" );
122 min_magnitude[0] = 4.2;
123 min_magnitude[1] = 3.6;
124 min_magnitude[2] = 3.0;
125 min_magnitude[3] = 2.4;
126 min_magnitude[4] = 1.8;
127 min_magnitude[5] = 1.2;
128 min_magnitude[6] = 0.6;
129 min_magnitude[7] = 0.0;
131 // build the various star display lists
132 for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
134 stars[i] = xglGenLists(1);
135 xglNewList( stars[i], GL_COMPILE );
136 xglBegin( GL_POINTS );
140 for ( j = 0; j < starcount; j++ ) {
141 magnitude = starlist[j].z();
142 // printf("magnitude = %.2f\n", magnitude);
144 if ( magnitude < min_magnitude[i] ) {
145 right_ascension = starlist[j].x();
146 declination = starlist[j].y();
150 // scale magnitudes to (0.0 - 1.0)
151 magnitude = (0.0 - magnitude) / 5.0 + 1.0;
153 // scale magnitudes again so they look ok
154 if ( magnitude > 1.0 ) { magnitude = 1.0; }
155 if ( magnitude < 0.0 ) { magnitude = 0.0; }
157 // magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
159 magnitude = magnitude * 0.9 +
160 (((FG_STAR_LEVELS - 1) - i) * 0.014);
161 // printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
162 // name, right_ascension, declination, magnitude);
164 xglColor3f( magnitude, magnitude, magnitude );
165 //xglColor3f(0,0,0);*/
166 xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
167 50000.0*sin(right_ascension)*cos(declination),
168 50000.0*sin(declination) );
175 xglBegin(GL_LINE_LOOP);
176 xglColor3f(1.0, 0.0, 0.0);
177 xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save-0.2),
178 50000.0 * sin(ra_save-0.2) * cos(decl_save-0.2),
179 50000.0 * sin(decl_save-0.2) );
180 xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save-0.2),
181 50000.0 * sin(ra_save+0.2) * cos(decl_save-0.2),
182 50000.0 * sin(decl_save-0.2) );
183 xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save+0.2),
184 50000.0 * sin(ra_save+0.2) * cos(decl_save+0.2),
185 50000.0 * sin(decl_save+0.2) );
186 xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save+0.2),
187 50000.0 * sin(ra_save-0.2) * cos(decl_save+0.2),
188 50000.0 * sin(decl_save+0.2) );
193 xglBegin(GL_LINE_LOOP);
194 xglColor3f(0.0, 1.0, 0.0);
195 xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1-0.2),
196 50000.0 * sin(ra_save1-0.2) * cos(decl_save1-0.2),
197 50000.0 * sin(decl_save1-0.2) );
198 xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1-0.2),
199 50000.0 * sin(ra_save1+0.2) * cos(decl_save1-0.2),
200 50000.0 * sin(decl_save1-0.2) );
201 xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1+0.2),
202 50000.0 * sin(ra_save1+0.2) * cos(decl_save1+0.2),
203 50000.0 * sin(decl_save1+0.2) );
204 xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1+0.2),
205 50000.0 * sin(ra_save1-0.2) * cos(decl_save1+0.2),
206 50000.0 * sin(decl_save1+0.2) );
212 FG_LOG( FG_ASTRO, FG_INFO,
213 " Loading " << count << " stars brighter than "
214 << min_magnitude[i] );
217 return 1; // OK, we got here because initialization worked.
222 void fgStarsRender( void ) {
228 f = current_aircraft.fdm_state;
229 l = &cur_light_params;
230 t = &cur_time_params;
232 // FG_PI_2 + 0.1 is about 6 degrees after sundown and before sunrise
234 // t->sun_angle = 3.0; // to force stars to be drawn (for testing)
237 if ( l->sun_angle > (FG_PI_2 + 5 * DEG_TO_RAD ) ) {
238 // determine which star structure to draw
239 if ( l->sun_angle > (FG_PI_2 + 10.0 * DEG_TO_RAD ) ) {
241 } else if ( l->sun_angle > (FG_PI_2 + 8.8 * DEG_TO_RAD ) ) {
243 } else if ( l->sun_angle > (FG_PI_2 + 7.5 * DEG_TO_RAD ) ) {
245 } else if ( l->sun_angle > (FG_PI_2 + 7.0 * DEG_TO_RAD ) ) {
247 } else if ( l->sun_angle > (FG_PI_2 + 6.5 * DEG_TO_RAD ) ) {
249 } else if ( l->sun_angle > (FG_PI_2 + 6.0 * DEG_TO_RAD ) ) {
251 } else if ( l->sun_angle > (FG_PI_2 + 5.5 * DEG_TO_RAD ) ) {
257 // printf("RENDERING STARS = %d (night)\n", i);
259 xglCallList(stars[i]);
261 // printf("not RENDERING STARS (day)\n");
267 // Revision 1.1 1999/04/05 21:32:48 curt
270 // Revision 1.27 1999/02/05 21:28:52 curt
271 // Modifications to incorporate Jon S. Berndts flight model code.
273 // Revision 1.26 1999/02/02 20:13:30 curt
274 // MSVC++ portability changes by Bernie Bright:
276 // Lib/Serial/serial.[ch]xx: Initial Windows support - incomplete.
277 // Simulator/Astro/stars.cxx: typo? included <stdio> instead of <cstdio>
278 // Simulator/Cockpit/hud.cxx: Added Standard headers
279 // Simulator/Cockpit/panel.cxx: Redefinition of default parameter
280 // Simulator/Flight/flight.cxx: Replaced cout with FG_LOG. Deleted <stdio.h>
281 // Simulator/Main/fg_init.cxx:
282 // Simulator/Main/GLUTmain.cxx:
283 // Simulator/Main/options.hxx: Shuffled <fg_serial.hxx> dependency
284 // Simulator/Objects/material.hxx:
285 // Simulator/Time/timestamp.hxx: VC++ friend kludge
286 // Simulator/Scenery/tile.[ch]xx: Fixed using std::X declarations
287 // Simulator/Main/views.hxx: Added a constant
289 // Revision 1.25 1998/12/09 18:50:15 curt
290 // Converted "class fgVIEW" to "class FGView" and updated to make data
291 // members private and make required accessor functions.
293 // Revision 1.24 1998/12/05 15:54:04 curt
294 // Renamed class fgFLIGHT to class FGState as per request by JSB.
296 // Revision 1.23 1998/11/23 21:48:28 curt
297 // Borland portability tweaks.
299 // Revision 1.22 1998/11/07 19:07:07 curt
300 // Enable release builds using the --without-logging option to the configure
301 // script. Also a couple log message cleanups, plus some C to C++ comment
304 // Revision 1.21 1998/11/06 21:17:42 curt
305 // Converted to new logstream debugging facility. This allows release
306 // builds with no messages at all (and no performance impact) by using
307 // the -DFG_NDEBUG flag.
309 // Revision 1.20 1998/11/06 14:47:02 curt
310 // Changes to track Bernie's updates to fgstream.
312 // Revision 1.19 1998/10/16 23:27:21 curt
315 // Revision 1.18 1998/10/16 00:52:20 curt
316 // Converted to Point3D class.
318 // Revision 1.17 1998/09/24 15:36:19 curt
319 // Converted to c++ style comments.
321 // Revision 1.16 1998/09/24 15:25:24 curt
322 // Miscellaneous tweaks.
325 // Revision 1.15 1998/09/17 18:25:12 curt
326 // Fixed output message.
328 // Revision 1.14 1998/09/15 04:26:22 curt
329 // New textured moon and rewritten/restructured Astro code contributed by Durk
332 // Revision 1.13 1998/09/01 19:03:04 curt
333 // Changes contributed by Bernie Bright <bbright@c031.aone.net.au>
334 // - The new classes in libmisc.tgz define a stream interface into zlib.
335 // I've put these in a new directory, Lib/Misc. Feel free to rename it
336 // to something more appropriate. However you'll have to change the
337 // include directives in all the other files. Additionally you'll have
338 // add the library to Lib/Makefile.am and Simulator/Main/Makefile.am.
340 // The StopWatch class in Lib/Misc requires a HAVE_GETRUSAGE autoconf
341 // test so I've included the required changes in config.tgz.
343 // There are a fair few changes to Simulator/Objects as I've moved
344 // things around. Loading tiles is quicker but thats not where the delay
345 // is. Tile loading takes a few tenths of a second per file on a P200
346 // but it seems to be the post-processing that leads to a noticeable
347 // blip in framerate. I suppose its time to start profiling to see where
350 // I've included a brief description of each archives contents.
355 // C++ stream interface into zlib.
356 // Taken from zlib-1.1.3/contrib/iostream/.
357 // Minor mods for STL compatibility.
358 // There's no copyright associated with these so I assume they're
359 // covered by zlib's.
363 // FlightGear input stream using gz_ifstream. Tries to open the
364 // given filename. If that fails then filename is examined and a
365 // ".gz" suffix is removed or appended and that file is opened.
368 // A simple timer for benchmarking. Not used in production code.
369 // Taken from the Blitz++ project. Covered by GPL.
373 // Some simple string manipulation routines.
375 // Simulator/Airports/
376 // Load airports database using fgstream.
377 // Changed fgAIRPORTS to use set<> instead of map<>.
378 // Added bool fgAIRPORTS::search() as a neater way doing the lookup.
379 // Returns true if found.
382 // Modified fgStarsInit() to load stars database using fgstream.
384 // Simulator/Objects/
385 // Modified fgObjLoad() to use fgstream.
386 // Modified fgMATERIAL_MGR::load_lib() to use fgstream.
387 // Many changes to fgMATERIAL.
388 // Some changes to fgFRAGMENT but I forget what!
390 // Revision 1.12 1998/08/27 17:02:01 curt
391 // Contributions from Bernie Bright <bbright@c031.aone.net.au>
392 // - use strings for fg_root and airport_id and added methods to return
394 // - inlined all access methods,
395 // - made the parsing functions private methods,
396 // - deleted some unused functions.
397 // - propogated some of these changes out a bit further.
399 // Revision 1.11 1998/08/25 20:53:29 curt
400 // Shuffled $FG_ROOT file layout.
402 // Revision 1.10 1998/08/10 20:33:09 curt
403 // Rewrote star loading and rendering to:
404 // 1. significantly improve load speed
405 // 2. transition from no stars to stars through eight stages.
407 // Revision 1.9 1998/08/06 12:45:20 curt
408 // Modified to bring in stars in 8 increments based on magnitude, not number
411 // Revision 1.8 1998/07/13 21:00:10 curt
412 // Wrote access functions for current fgOPTIONS.
414 // Revision 1.7 1998/05/29 20:35:42 curt
415 // Added zlib support for reading in compressed data files.
417 // Revision 1.6 1998/05/13 18:25:35 curt
418 // Root path info moved to fgOPTIONS.
420 // Revision 1.5 1998/04/28 01:19:03 curt
421 // Type-ified fgTIME and fgVIEW
423 // Revision 1.4 1998/04/26 05:10:02 curt
424 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
426 // Revision 1.3 1998/04/25 22:06:26 curt
427 // Edited cvs log messages in source files ... bad bad bad!
429 // Revision 1.2 1998/04/24 00:45:03 curt
430 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
431 // Fixed a bug when generating sky colors.
433 // Revision 1.1 1998/04/22 13:21:34 curt
434 // C++ - ifing the code a bit.
436 // Revision 1.11 1998/04/18 04:13:58 curt
437 // Moved fg_debug.c to it's own library.
439 // Revision 1.10 1998/04/03 21:52:51 curt
440 // Converting to Gnu autoconf system.
442 // Revision 1.9 1998/03/14 00:27:12 curt
443 // Updated fgGENERAL to a "type" of struct.
445 // Revision 1.8 1998/02/12 21:59:38 curt
446 // Incorporated code changes contributed by Charlie Hotchkiss
447 // <chotchkiss@namg.us.anritsu.com>
449 // Revision 1.7 1998/02/09 15:07:48 curt
452 // Revision 1.6 1998/02/02 20:53:23 curt
455 // Revision 1.5 1998/01/27 18:35:53 curt
458 // Revision 1.4 1998/01/27 00:47:49 curt
459 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
460 // system and commandline/config file processing code.
462 // Revision 1.3 1998/01/19 19:26:59 curt
463 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
464 // This should simplify things tremendously.
466 // Revision 1.2 1998/01/19 18:40:18 curt
467 // Tons of little changes to clean up the code and to remove fatal errors
468 // when building with the c++ compiler.
470 // Revision 1.1 1998/01/07 03:16:20 curt
471 // Moved from .../Src/Scenery/ to .../Src/Astro/
473 // Revision 1.24 1997/12/30 22:22:39 curt
474 // Further integration of event manager.
476 // Revision 1.23 1997/12/30 20:47:53 curt
477 // Integrated new event manager with subsystem initializations.
479 // Revision 1.22 1997/12/30 16:36:53 curt
480 // Merged in Durk's changes ...
482 // Revision 1.21 1997/12/19 23:35:00 curt
483 // Lot's of tweaking with sky rendering and lighting.
485 // Revision 1.20 1997/12/15 23:55:03 curt
486 // Add xgl wrappers for debugging.
487 // Generate terrain normals on the fly.
489 // Revision 1.19 1997/12/12 19:53:00 curt
490 // Working on lightling and material properties.
492 // Revision 1.18 1997/12/10 22:37:52 curt
493 // Prepended "fg" on the name of all global structures that didn't have it yet.
494 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
496 // Revision 1.17 1997/12/09 04:25:33 curt
497 // Working on adding a global lighting params structure.
499 // Revision 1.16 1997/11/25 19:25:38 curt
500 // Changes to integrate Durk's moon/sun code updates + clean up.
502 // Revision 1.15 1997/10/30 12:38:45 curt
503 // Working on new scenery subsystem.
505 // Revision 1.14 1997/10/28 21:00:22 curt
506 // Changing to new terrain format.
508 // Revision 1.13 1997/10/25 03:18:28 curt
509 // Incorporated sun, moon, and planet position and rendering code contributed
512 // Revision 1.12 1997/09/23 00:29:43 curt
513 // Tweaks to get things to compile with gcc-win32.
515 // Revision 1.11 1997/09/22 14:44:21 curt
516 // Continuing to try to align stars correctly.
518 // Revision 1.10 1997/09/20 03:34:32 curt
519 // Still trying to get those durned stars aligned properly.
521 // Revision 1.9 1997/09/18 16:20:09 curt
522 // At dusk/dawn add/remove stars in stages.
524 // Revision 1.8 1997/09/16 22:14:52 curt
525 // Tweaked time of day lighting equations. Don't draw stars during the day.
527 // Revision 1.7 1997/09/16 15:50:31 curt
528 // Working on star alignment and time issues.
530 // Revision 1.6 1997/09/05 14:17:31 curt
531 // More tweaking with stars.
533 // Revision 1.5 1997/09/05 01:35:59 curt
534 // Working on getting stars right.
536 // Revision 1.4 1997/09/04 02:17:38 curt
539 // Revision 1.3 1997/08/29 17:55:28 curt
540 // Worked on properly aligning the stars.
542 // Revision 1.2 1997/08/27 21:32:30 curt
543 // Restructured view calculation code. Added stars.
545 // Revision 1.1 1997/08/27 03:34:48 curt