From 57ae31aa504074961e21e9a3e9c30b1717750f95 Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Tue, 25 Nov 1997 23:20:22 +0000
Subject: [PATCH] Initial revision.

---
 Scenery/astro.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++
 Scenery/astro.h |  55 +++++++++++++++++++++
 2 files changed, 180 insertions(+)
 create mode 100644 Scenery/astro.c
 create mode 100644 Scenery/astro.h

diff --git a/Scenery/astro.c b/Scenery/astro.c
new file mode 100644
index 000000000..a95346963
--- /dev/null
+++ b/Scenery/astro.c
@@ -0,0 +1,125 @@
+/**************************************************************************
+ * astro.c
+ *
+ * Written by Durk Talsma. Started November 1997, for use with the flight
+ * gear project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id$
+ * (Log is kept at end of this file)
+ **************************************************************************/
+
+
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+#include <GL/glut.h>
+
+#include "astro.h"
+#include "moon.h"
+#include "orbits.h"
+#include "planets.h"
+#include "stars.h"
+#include "sun.h"
+
+#include "../constants.h"
+#include "../general.h"
+
+#include "../Main/views.h"
+#include "../Aircraft/aircraft.h"
+#include "../Time/fg_time.h"
+
+static double prevUpdate = 0;
+
+
+/* Initialize Astronomical Objects */
+void fgAstroInit() {
+    struct fgTIME *t;
+    t = &cur_time_params;
+
+    /* Initialize the orbital elements of sun, moon and mayor planets */
+    fgSolarSystemInit(*t);
+
+    /* Intialize the moon's position */
+    fgMoonInit(); 
+
+    /* Initialize the sun's position */
+    fgSunInit();       
+
+    /* Initialize the Stars subsystem  */
+    fgStarsInit();             
+}
+
+
+/* Render Astronomical Objects */
+void fgAstroRender() {
+    struct FLIGHT *f;
+    struct VIEW *v;
+    struct fgTIME *t;
+    double angle;
+
+    f = &current_aircraft.flight;
+    t = &cur_time_params;
+    v = &current_view;
+
+    /* a hack: Force sun and moon position to be updated on an hourly basis */
+    if (((t->gst - prevUpdate) > 1) || (t->gst < prevUpdate)) {
+	prevUpdate = t->gst;
+	fgSunInit();
+	fgMoonInit();
+    }
+
+    /* Disable fog effects */
+    glDisable( GL_FOG );
+
+    /* reverse light direction so the moon is displayed properly */
+    glLightfv( GL_LIGHT0, GL_POSITION, t->sun_vec_inv );
+
+    glPushMatrix();
+
+    /* Translate to view position */
+    glTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
+
+    /* Rotate based on gst (side real time) */
+    angle = t->gst * 15.041085; /* should be 15.041085, Curt thought it was 15*/
+#ifdef DEBUG
+    printf("Rotating astro objects by %.2f degrees\n",angle);
+#endif
+    glRotatef( angle, 0.0, 0.0, -1.0 );
+
+    /* render the stars */
+    fgStarsRender();
+
+    /* render the moon */
+    fgMoonRender();
+
+    /* render the sun */
+    fgSunRender();
+
+    glPopMatrix();
+
+    /* reenable fog effects */
+    glEnable( GL_FOG );
+}
+
+
+/* $Log$
+/* Revision 1.1  1997/11/25 23:20:22  curt
+/* Initial revision.
+/*
+ */
diff --git a/Scenery/astro.h b/Scenery/astro.h
new file mode 100644
index 000000000..c273d1a84
--- /dev/null
+++ b/Scenery/astro.h
@@ -0,0 +1,55 @@
+/**************************************************************************
+ * astro.h
+ *
+ * Written by Durk Talsma. Started November 1997, for use with the flight
+ * gear project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id$
+ * (Log is kept at end of this file)
+ **************************************************************************/
+
+
+#ifndef _ASTRO_H_
+#define _ASTRO_H_
+
+#include <GL/glut.h>
+#include "stars.h"
+
+extern struct CelestialCoord
+    moonPos;
+
+extern float xMoon, yMoon, zMoon, xSun, ySun, zSun;
+extern GLint moon, sun;
+extern GLint stars[FG_STAR_LEVELS];
+extern GLfloat fgClearColor[4];
+
+
+/* Initialize Astronomical Objects */
+void fgAstroInit();
+
+/* Render Astronomical objects */
+void fgAstroRender();
+
+
+#endif /* _ASTRO_H_ */
+
+
+/* $Log$
+/* Revision 1.1  1997/11/25 23:20:23  curt
+/* Initial revision.
+/*
+ */