163 lines
4.1 KiB
C
163 lines
4.1 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 "stars.h"
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#include "../constants.h"
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#include "../general.h"
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#include "../GLUT/views.h"
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#include "../Aircraft/aircraft.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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static GLint stars;
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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 GENERAL *g;
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char path[1024];
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char line[256], name[256];
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char *tmp_ptr;
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double right_ascension, declination, magnitude;
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GLfloat mag[4] = {0.0, 0.0, 0.0, 1.0};
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int count;
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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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printf("Loading Stars: %s\n", 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 = glGenLists(1);
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glNewList( stars, 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 < FG_MAX_STARS) ) {
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tmp_ptr = line;
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/* advance to first non-whitespace character */
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while ( (tmp_ptr[0] == ' ') || (tmp_ptr[0] == '\t') ) {
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tmp_ptr++;
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}
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if ( tmp_ptr[0] == '#' ) {
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/* comment */
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} else if ( strlen(tmp_ptr) == 0 ) {
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/* blank line */
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} else {
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/* star data line */
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fscanf(fd, "%s %lf %lf %lf\n",
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name, &right_ascension, &declination, &magnitude);
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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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count++;
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magnitude = magnitude * 0.8 + 0.2;
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mag[0] = mag[1] = mag[2] = magnitude;
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glColor3f( mag[0], mag[1], mag[2] );
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glVertex3f( 190000.0 * sin(right_ascension) * cos(declination),
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190000.0 * cos(right_ascension) * cos(declination),
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190000.0 * sin(declination) );
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} /* if valid line */
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} /* while */
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glEnd();
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glEndList();
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}
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/* Draw the Stars */
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void fgStarsRender() {
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struct FLIGHT *f;
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struct VIEW *v;
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double angle;
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f = ¤t_aircraft.flight;
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v = ¤t_view;
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printf("RENDERING STARS\n");
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glDisable( GL_FOG );
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glDisable( GL_LIGHTING );
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glPushMatrix();
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glTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
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angle = FG_2PI * fmod(DaysSinceEpoch(time(NULL)), 1.0);
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glRotatef( -angle * RAD_TO_DEG, 0.0, 0.0, 1.0 );
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printf("Rotating stars by %.2f\n", -angle * RAD_TO_DEG);
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glCallList(stars);
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glPopMatrix();
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glEnable( GL_LIGHTING );
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glEnable( GL_FOG );
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}
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/* $Log$
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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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