267 lines
7.4 KiB
C++
267 lines
7.4 KiB
C++
// stars.cxx -- data structures and routines for managing and rendering stars.
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//
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// Written by Curtis Olson, started August 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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//*************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include "Include/compiler.h"
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#ifdef FG_HAVE_STD_INCLUDES
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# include <cmath>
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# include <cstdio>
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# include <cstring>
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# include <ctime>
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#else
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# include <math.h>
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# include <stdio.h>
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# include <string.h>
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# include <time.h>
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#endif
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#include <string>
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#include <GL/glut.h>
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#include <XGL/xgl.h>
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#include <Aircraft/aircraft.hxx>
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#include <Debug/logstream.hxx>
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#include <Include/fg_constants.h>
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#include <Misc/fgpath.hxx>
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#include <Misc/fgstream.hxx>
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#include <Misc/stopwatch.hxx>
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#include <Main/options.hxx>
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#include <Main/views.hxx>
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#include <Time/fg_time.hxx>
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#include "Misc/stopwatch.hxx"
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#include "stars.hxx"
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FG_USING_STD(getline);
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#define EpochStart (631065600)
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#define DaysSinceEpoch(secs) (((secs)-EpochStart)*(1.0/(24*3600)))
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#define FG_MAX_STARS 3500
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// Define four structures, each with varying amounts of stars
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static GLint stars[FG_STAR_LEVELS];
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// Initialize the Star Management Subsystem
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int fgStarsInit( void ) {
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// -dw- avoid local data > 32k error by dynamic allocation of the
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// array, problem for some compilers
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Point3D *starlist = new Point3D[FG_MAX_STARS];
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// struct CelestialCoord pltPos;
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double right_ascension, declination, magnitude;
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double min_magnitude[FG_STAR_LEVELS];
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// double ra_save, decl_save;
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// double ra_save1, decl_save1;
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int i, j, starcount, count;
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FG_LOG( FG_ASTRO, FG_INFO, "Initializing stars" );
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if ( FG_STAR_LEVELS < 4 ) {
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FG_LOG( FG_ASTRO, FG_ALERT, "Big whups in stars.cxx" );
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exit(-1);
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}
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// build the full path name to the stars data base file
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FGPath path ( current_options.get_fg_root() );
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path.append( "Astro/stars" );
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FG_LOG( FG_ASTRO, FG_INFO, " Loading stars from " << path.str() );
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fg_gzifstream in( path.str() );
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if ( ! in ) {
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FG_LOG( FG_ASTRO, FG_ALERT, "Cannot open star file: " << path.str() );
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exit(-1);
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}
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starcount = 0;
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StopWatch timer;
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timer.start();
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// read in each line of the file
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while ( ! in.eof() && starcount < FG_MAX_STARS )
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{
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in >> skipcomment;
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string name;
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getline( in, name, ',' );
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in >> starlist[starcount];
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++starcount;
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}
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timer.stop();
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FG_LOG( FG_ASTRO, FG_INFO,
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"Loaded " << starcount << " stars in "
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<< timer.elapsedSeconds() << " seconds" );
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min_magnitude[0] = 4.2;
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min_magnitude[1] = 3.6;
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min_magnitude[2] = 3.0;
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min_magnitude[3] = 2.4;
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min_magnitude[4] = 1.8;
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min_magnitude[5] = 1.2;
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min_magnitude[6] = 0.6;
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min_magnitude[7] = 0.0;
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// build the various star display lists
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for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
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stars[i] = xglGenLists(1);
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xglNewList( stars[i], GL_COMPILE );
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xglBegin( GL_POINTS );
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count = 0;
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for ( j = 0; j < starcount; j++ ) {
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magnitude = starlist[j].z();
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// printf("magnitude = %.2f\n", magnitude);
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if ( magnitude < min_magnitude[i] ) {
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right_ascension = starlist[j].x();
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declination = starlist[j].y();
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count++;
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// scale magnitudes to (0.0 - 1.0)
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magnitude = (0.0 - magnitude) / 5.0 + 1.0;
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// scale magnitudes again so they look ok
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if ( magnitude > 1.0 ) { magnitude = 1.0; }
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if ( magnitude < 0.0 ) { magnitude = 0.0; }
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// magnitude =
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// magnitude * 0.7 + (((FG_STAR_LEVELS - 1) - i) * 0.042);
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magnitude = magnitude * 0.9 +
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(((FG_STAR_LEVELS - 1) - i) * 0.014);
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// printf(" Found star: %d %s, %.3f %.3f %.3f\n", count,
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// name, right_ascension, declination, magnitude);
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xglColor3f( magnitude, magnitude, magnitude );
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//xglColor3f(0,0,0);*/
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xglVertex3f( 50000.0*cos(right_ascension)*cos(declination),
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50000.0*sin(right_ascension)*cos(declination),
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50000.0*sin(declination) );
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}
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} // while
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xglEnd();
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/*
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xglBegin(GL_LINE_LOOP);
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xglColor3f(1.0, 0.0, 0.0);
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xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save-0.2),
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50000.0 * sin(ra_save-0.2) * cos(decl_save-0.2),
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50000.0 * sin(decl_save-0.2) );
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xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save-0.2),
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50000.0 * sin(ra_save+0.2) * cos(decl_save-0.2),
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50000.0 * sin(decl_save-0.2) );
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xglVertex3f( 50000.0 * cos(ra_save+0.2) * cos(decl_save+0.2),
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50000.0 * sin(ra_save+0.2) * cos(decl_save+0.2),
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50000.0 * sin(decl_save+0.2) );
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xglVertex3f( 50000.0 * cos(ra_save-0.2) * cos(decl_save+0.2),
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50000.0 * sin(ra_save-0.2) * cos(decl_save+0.2),
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50000.0 * sin(decl_save+0.2) );
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xglEnd();
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*/
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/*
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xglBegin(GL_LINE_LOOP);
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xglColor3f(0.0, 1.0, 0.0);
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xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1-0.2),
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50000.0 * sin(ra_save1-0.2) * cos(decl_save1-0.2),
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50000.0 * sin(decl_save1-0.2) );
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xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1-0.2),
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50000.0 * sin(ra_save1+0.2) * cos(decl_save1-0.2),
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50000.0 * sin(decl_save1-0.2) );
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xglVertex3f( 50000.0 * cos(ra_save1+0.2) * cos(decl_save1+0.2),
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50000.0 * sin(ra_save1+0.2) * cos(decl_save1+0.2),
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50000.0 * sin(decl_save1+0.2) );
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xglVertex3f( 50000.0 * cos(ra_save1-0.2) * cos(decl_save1+0.2),
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50000.0 * sin(ra_save1-0.2) * cos(decl_save1+0.2),
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50000.0 * sin(decl_save1+0.2) );
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xglEnd();
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*/
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xglEndList();
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FG_LOG( FG_ASTRO, FG_INFO,
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" Loading " << count << " stars brighter than "
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<< min_magnitude[i] );
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}
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return 1; // OK, we got here because initialization worked.
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}
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// Draw the Stars
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void fgStarsRender( void ) {
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FGInterface *f;
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fgLIGHT *l;
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FGTime *t;
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int i;
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f = current_aircraft.fdm_state;
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l = &cur_light_params;
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t = FGTime::cur_time_params;
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// FG_PI_2 + 0.1 is about 6 degrees after sundown and before sunrise
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// t->sun_angle = 3.0; // to force stars to be drawn (for testing)
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// render the stars
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if ( l->sun_angle > (FG_PI_2 + 5 * DEG_TO_RAD ) ) {
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// determine which star structure to draw
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if ( l->sun_angle > (FG_PI_2 + 10.0 * DEG_TO_RAD ) ) {
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i = 0;
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} else if ( l->sun_angle > (FG_PI_2 + 8.8 * DEG_TO_RAD ) ) {
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i = 1;
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} else if ( l->sun_angle > (FG_PI_2 + 7.5 * DEG_TO_RAD ) ) {
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i = 2;
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} else if ( l->sun_angle > (FG_PI_2 + 7.0 * DEG_TO_RAD ) ) {
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i = 3;
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} else if ( l->sun_angle > (FG_PI_2 + 6.5 * DEG_TO_RAD ) ) {
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i = 4;
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} else if ( l->sun_angle > (FG_PI_2 + 6.0 * DEG_TO_RAD ) ) {
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i = 5;
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} else if ( l->sun_angle > (FG_PI_2 + 5.5 * DEG_TO_RAD ) ) {
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i = 6;
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} else {
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i = 7;
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}
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// printf("RENDERING STARS = %d (night)\n", i);
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xglCallList(stars[i]);
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} else {
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// printf("not RENDERING STARS (day)\n");
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}
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}
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