315 lines
9 KiB
C
315 lines
9 KiB
C
/**************************************************************************
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* stars.c -- 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@infoplane.com
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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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* (Log is kept at end of this file)
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**************************************************************************/
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#ifdef WIN32
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# include <windows.h>
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#endif
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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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#include <GL/glut.h>
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#include "orbits.h"
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#include "planets.h"
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#include "stars.h"
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#include "../constants.h"
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#include "../general.h"
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#include "../Aircraft/aircraft.h"
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#include "../Main/views.h"
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#include "../Time/fg_time.h"
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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 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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void fgStarsInit() {
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FILE *fd;
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struct fgGENERAL *g;
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struct CelestialCoord pltPos;
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char path[1024];
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char line[256], name[256];
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char *front, *end;
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double right_ascension, declination, magnitude;
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double ra_save, decl_save;
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double ra_save1, decl_save1;
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int count, i, j, max_stars;
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g = &general;
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/* build the full path name to the stars data base file */
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path[0] = '\0';
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strcat(path, g->root_dir);
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strcat(path, "/Scenery/");
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strcat(path, "Stars.dat");
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max_stars = FG_MAX_STARS;
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for ( i = 0; i < FG_STAR_LEVELS; i++ ) {
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printf("Loading %d Stars: %s\n", max_stars, path);
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if ( (fd = fopen(path, "r")) == NULL ) {
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printf("Cannot open star file: '%s'\n", path);
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return;
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}
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stars[i] = glGenLists(1);
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glNewList( stars[i], GL_COMPILE );
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glBegin( GL_POINTS );
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/* read in each line of the file */
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count = 0;
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while ( (fgets(line, 256, fd) != NULL) && (count < max_stars) ) {
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front = line;
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/* printf("Read line = %s", front); */
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/* advance to first non-whitespace character */
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while ( (front[0] == ' ') || (front[0] == '\t') ) {
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front++;
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}
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/* printf("Line length (after trimming) = %d\n", strlen(front)); */
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if ( front[0] == '#' ) {
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/* comment */
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} else if ( strlen(front) <= 1 ) {
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/* blank line */
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} else {
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/* star data line */
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/* get name */
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end = front;
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while ( end[0] != ',' ) {
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end++;
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}
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end[0] = '\0';
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strcpy(name, front);
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front = end;
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front++;
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sscanf(front, "%lf,%lf,%lf\n",
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&right_ascension, &declination, &magnitude);
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if ( strcmp(name, "Betelgeuse") == 0 ) {
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printf(" *** Marking %s\n", name);
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ra_save = right_ascension;
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decl_save = declination;
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}
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if ( strcmp(name, "Alnilam") == 0 ) {
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printf(" *** Marking %s\n", name);
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ra_save1 = right_ascension;
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decl_save1 = declination;
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}
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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) * 0.1);
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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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glColor3f( magnitude, magnitude, magnitude );
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/*glColor3f(0,0,0);*/
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glVertex3f( 190000.0 * cos(right_ascension) * cos(declination),
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190000.0 * sin(right_ascension) * cos(declination),
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190000.0 * sin(declination) );
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count++;
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} /* if valid line */
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} /* while */
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fclose(fd);
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/* Add the planets to all four display lists */
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for ( j = 2; j < 9; j++ ) {
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pltPos = fgCalculatePlanet(pltOrbElements[j],
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pltOrbElements[0], cur_time_params);
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printf("Planet found at %f (ra), %f (dec)\n",
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pltPos.RightAscension, pltPos.Declination);
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/* give the planets a temporary color, for testing purposes */
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glColor3f( 1.0, 0.0, 0.0);
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glVertex3f( 190000.0 * cos(pltPos.RightAscension) *
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cos(pltPos.Declination),
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190000.0 * sin(pltPos.RightAscension) *
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cos(pltPos.Declination),
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190000.0 * sin(pltPos.Declination) );
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}
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glEnd();
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glBegin(GL_LINE_LOOP);
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glColor3f(1.0, 0.0, 0.0);
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glVertex3f( 190000.0 * cos(ra_save-0.2) * cos(decl_save-0.2),
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190000.0 * sin(ra_save-0.2) * cos(decl_save-0.2),
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190000.0 * sin(decl_save-0.2) );
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glVertex3f( 190000.0 * cos(ra_save+0.2) * cos(decl_save-0.2),
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190000.0 * sin(ra_save+0.2) * cos(decl_save-0.2),
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190000.0 * sin(decl_save-0.2) );
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glVertex3f( 190000.0 * cos(ra_save+0.2) * cos(decl_save+0.2),
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190000.0 * sin(ra_save+0.2) * cos(decl_save+0.2),
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190000.0 * sin(decl_save+0.2) );
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glVertex3f( 190000.0 * cos(ra_save-0.2) * cos(decl_save+0.2),
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190000.0 * sin(ra_save-0.2) * cos(decl_save+0.2),
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190000.0 * sin(decl_save+0.2) );
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glEnd();
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glBegin(GL_LINE_LOOP);
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glColor3f(0.0, 1.0, 0.0);
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glVertex3f( 190000.0 * cos(ra_save1-0.2) * cos(decl_save1-0.2),
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190000.0 * sin(ra_save1-0.2) * cos(decl_save1-0.2),
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190000.0 * sin(decl_save1-0.2) );
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glVertex3f( 190000.0 * cos(ra_save1+0.2) * cos(decl_save1-0.2),
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190000.0 * sin(ra_save1+0.2) * cos(decl_save1-0.2),
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190000.0 * sin(decl_save1-0.2) );
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glVertex3f( 190000.0 * cos(ra_save1+0.2) * cos(decl_save1+0.2),
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190000.0 * sin(ra_save1+0.2) * cos(decl_save1+0.2),
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190000.0 * sin(decl_save1+0.2) );
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glVertex3f( 190000.0 * cos(ra_save1-0.2) * cos(decl_save1+0.2),
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190000.0 * sin(ra_save1-0.2) * cos(decl_save1+0.2),
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190000.0 * sin(decl_save1+0.2) );
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glEnd();
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glEndList();
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max_stars /= 2;
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}
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}
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/* Draw the Stars */
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void fgStarsRender() {
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struct fgFLIGHT *f;
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struct fgVIEW *v;
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struct fgLIGHT *l;
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struct fgTIME *t;
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int i;
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f = ¤t_aircraft.flight;
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l = &cur_light_params;
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t = &cur_time_params;
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v = ¤t_view;
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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 + 7.25 * DEG_TO_RAD ) ) {
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i = 0;
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} else if ( l->sun_angle > (FG_PI_2 + 6.50 * DEG_TO_RAD ) ) {
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i = 1;
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} else if ( l->sun_angle > (FG_PI_2 + 5.75 * DEG_TO_RAD ) ) {
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i = 2;
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} else {
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i = 3;
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}
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printf("RENDERING STARS = %d (night)\n", i);
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glDisable( GL_LIGHTING );
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glCallList(stars[i]);
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glEnable( GL_LIGHTING );
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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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/* $Log$
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/* Revision 1.18 1997/12/10 22:37:52 curt
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/* Prepended "fg" on the name of all global structures that didn't have it yet.
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/* i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
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/*
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* Revision 1.17 1997/12/09 04:25:33 curt
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* Working on adding a global lighting params structure.
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*
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* Revision 1.16 1997/11/25 19:25:38 curt
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* Changes to integrate Durk's moon/sun code updates + clean up.
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*
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* Revision 1.15 1997/10/30 12:38:45 curt
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* Working on new scenery subsystem.
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*
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* Revision 1.14 1997/10/28 21:00:22 curt
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* Changing to new terrain format.
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*
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* Revision 1.13 1997/10/25 03:18:28 curt
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* Incorporated sun, moon, and planet position and rendering code contributed
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* by Durk Talsma.
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*
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* Revision 1.12 1997/09/23 00:29:43 curt
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* Tweaks to get things to compile with gcc-win32.
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*
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* Revision 1.11 1997/09/22 14:44:21 curt
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* Continuing to try to align stars correctly.
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*
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* Revision 1.10 1997/09/20 03:34:32 curt
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* Still trying to get those durned stars aligned properly.
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*
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* Revision 1.9 1997/09/18 16:20:09 curt
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* At dusk/dawn add/remove stars in stages.
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*
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* Revision 1.8 1997/09/16 22:14:52 curt
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* Tweaked time of day lighting equations. Don't draw stars during the day.
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*
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* Revision 1.7 1997/09/16 15:50:31 curt
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* Working on star alignment and time issues.
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*
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* Revision 1.6 1997/09/05 14:17:31 curt
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* More tweaking with stars.
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*
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* Revision 1.5 1997/09/05 01:35:59 curt
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* Working on getting stars right.
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*
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* Revision 1.4 1997/09/04 02:17:38 curt
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* Shufflin' stuff.
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*
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* Revision 1.3 1997/08/29 17:55:28 curt
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* Worked on properly aligning the stars.
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*
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* Revision 1.2 1997/08/27 21:32:30 curt
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* Restructured view calculation code. Added stars.
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*
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* Revision 1.1 1997/08/27 03:34:48 curt
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* Initial revision.
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*
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*/
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