152 lines
4 KiB
C
152 lines
4 KiB
C
/**************************************************************************
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* astro.c
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*
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* Written by Durk Talsma. Started November 1997, for use with the flight
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* gear project.
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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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#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 "../XGL/xgl.h"
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#include "astro.h"
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#include "moon.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 "sun.h"
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#include "../Include/constants.h"
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#include "../Include/general.h"
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#include "../Main/views.h"
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#include "../Aircraft/aircraft.h"
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#include "../Time/fg_time.h"
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static double prevUpdate = 0;
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/* Initialize Astronomical Objects */
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void fgAstroInit() {
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struct fgTIME *t;
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t = &cur_time_params;
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/* Initialize the orbital elements of sun, moon and mayor planets */
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fgSolarSystemInit(*t);
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/* Initialize the Stars subsystem */
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fgStarsInit();
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/* Initialize the sun's position */
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fgSunInit();
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/* Intialize the moon's position */
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fgMoonInit();
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}
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/* Render Astronomical Objects */
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void fgAstroRender() {
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struct fgFLIGHT *f;
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struct fgLIGHT *l;
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struct fgVIEW *v;
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struct fgTIME *t;
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double angle;
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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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/* a hack: Force sun and moon position to be updated on an hourly basis */
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if (((t->gst - prevUpdate) > 1) || (t->gst < prevUpdate)) {
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prevUpdate = t->gst;
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fgSunInit();
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fgMoonInit();
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}
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/* set the sun position */
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/* xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec_inv ); */
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xglPushMatrix();
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/* Translate to view position */
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xglTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
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/* Rotate based on gst (side real time) */
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angle = t->gst * 15.041085; /* should be 15.041085, Curt thought it was 15*/
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#ifdef DEBUG
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printf("Rotating astro objects by %.2f degrees\n",angle);
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#endif
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xglRotatef( angle, 0.0, 0.0, -1.0 );
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/* render the moon */
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fgMoonRender();
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/* render the stars */
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fgStarsRender();
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/* render the sun */
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fgSunRender();
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xglPopMatrix();
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}
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/* $Log$
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/* Revision 1.10 1997/12/19 16:45:01 curt
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/* Working on scene rendering order and options.
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/*
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* Revision 1.9 1997/12/18 23:32:35 curt
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* First stab at sky dome actually starting to look reasonable. :-)
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*
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* Revision 1.8 1997/12/15 23:54:57 curt
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* Add xgl wrappers for debugging.
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* Generate terrain normals on the fly.
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*
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* Revision 1.7 1997/12/15 20:59:09 curt
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* Misc. tweaks.
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*
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* Revision 1.6 1997/12/12 21:41:27 curt
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* More light/material property tweaking ... still a ways off.
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*
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* Revision 1.5 1997/12/12 19:52:54 curt
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* Working on lightling and material properties.
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*
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* Revision 1.4 1997/12/11 04:43:56 curt
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* Fixed sun vector and lighting problems. I thing the moon is now lit
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* correctly.
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*
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* Revision 1.3 1997/12/10 22:37:49 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 1.2 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 1.1 1997/11/25 23:20:22 curt
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* Initial revision.
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*
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*/
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