169 lines
3.9 KiB
C
169 lines
3.9 KiB
C
/**************************************************************************
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* sky.c -- model sky with an upside down "bowl"
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*
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* Written by Curtis Olson, started December 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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/*
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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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*/
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#include <GL/glut.h>
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#include "../XGL/xgl.h"
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#include "sky.h"
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#include "../Time/fg_time.h"
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#include "../Include/constants.h"
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#include "../Main/views.h"
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/*
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#include "../Include/general.h"
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#include "../Aircraft/aircraft.h"
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*/
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/* in meters of course */
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#define INNER_RADIUS 50000.0
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#define INNER_ELEV 20000.0
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#define MIDDLE_RADIUS 70000.0
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#define MIDDLE_ELEV 10000.0
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#define OUTER_RADIUS 80000.0
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#define OUTER_ELEV 0.0
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static GLint sky; /* sky display list */
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static float sky_center[12][3];
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static float sky_middle[12][3];
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static float sky_outer[12][3];
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/* (Re)generate the display list */
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void fgSkyInit() {
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struct fgLIGHT *l;
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static int dl_exists = 0;
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float theta;
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int i;
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l = &cur_light_params;
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if ( dl_exists ) {
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xglDeleteLists(sky, 1);
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} else {
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dl_exists = 1;
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/* first time through, calculate sky vertices */
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for ( i = 0; i < 12; i++ ) {
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theta = (i * 30.0) * DEG_TO_RAD;
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sky_center[i][0] = cos(theta) * INNER_RADIUS;
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sky_center[i][1] = sin(theta) * INNER_RADIUS;
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sky_center[i][2] = INNER_ELEV;
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printf(" %.2f %.2f\n", cos(theta) * INNER_RADIUS,
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sin(theta) * INNER_RADIUS);
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sky_middle[i][0] = cos((double)theta) * MIDDLE_RADIUS;
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sky_middle[i][1] = sin((double)theta) * MIDDLE_RADIUS;
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sky_middle[i][2] = MIDDLE_ELEV;
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sky_outer[i][0] = cos((double)theta) * OUTER_RADIUS;
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sky_outer[i][1] = sin((double)theta) * OUTER_RADIUS;
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sky_outer[i][2] = OUTER_ELEV;
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}
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}
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printf("Creating the sky\n");
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sky = xglGenLists(1);
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xglNewList(sky, GL_COMPILE );
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/* xglMaterialfv(GL_FRONT, GL_AMBIENT, l->scene_clear);
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xglMaterialfv(GL_FRONT, GL_DIFFUSE, moon_color); */
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/* Draw inner section */
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xglBegin( GL_TRIANGLE_FAN );
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xglVertex3f(0.0, 0.0, INNER_ELEV);
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for ( i = 0; i < 12; i++ ) {
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xglVertex3fv( sky_center[i] );
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}
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xglEnd();
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xglEndList();
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}
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/* Draw the Sky */
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void fgSkyRender() {
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struct fgVIEW *v;
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/*
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struct fgFLIGHT *f;
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struct fgLIGHT *l;
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struct fgTIME *t;
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int i;
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*/
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v = ¤t_view;
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/*
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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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*/
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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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printf("Rendering the sky.\n");
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xglDisable( GL_LIGHTING );
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xglPushMatrix();
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/* Translate to view position */
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xglTranslatef( v->cur_zero_elev.x, v->cur_zero_elev.y, v->cur_zero_elev.z );
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xglCallList( sky );
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xglPopMatrix();
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xglEnable( GL_LIGHTING );
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}
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/* $Log$
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/* Revision 1.1 1997/12/17 23:14:30 curt
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/* Initial revision.
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/* Begin work on rendering the sky. (Rather than just using a clear screen.)
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/*
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*/
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