Initial revision.

Begin work on rendering the sky. (Rather than just using a clear screen.)

Scenery/sky.c

@@ -0,0 +1,168 @@
+/**************************************************************************
+ * sky.c -- model sky with an upside down "bowl"
+ *
+ * Written by Curtis Olson, started December 1997.
+ *
+ * Copyright (C) 1997  Curtis L. Olson  - curt@infoplane.com
+ *
+ * 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)
+ **************************************************************************/
+
+
+#ifdef WIN32
+#  include <windows.h>
+#endif
+
+#include <math.h>
+/*
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+*/
+
+#include <GL/glut.h>
+#include "../XGL/xgl.h"
+
+#include "sky.h"
+
+#include "../Time/fg_time.h"
+
+#include "../Include/constants.h"
+#include "../Main/views.h"
+/*
+#include "../Include/general.h"
+#include "../Aircraft/aircraft.h"
+*/
+
+/* in meters of course */
+#define INNER_RADIUS  50000.0
+#define INNER_ELEV    20000.0
+#define MIDDLE_RADIUS 70000.0
+#define MIDDLE_ELEV   10000.0
+#define OUTER_RADIUS  80000.0
+#define OUTER_ELEV        0.0
+
+
+static GLint sky;  /* sky display list */
+static float sky_center[12][3];
+static float sky_middle[12][3];
+static float sky_outer[12][3];
+
+/* (Re)generate the display list */
+void fgSkyInit() {
+    struct fgLIGHT *l;
+    static int dl_exists = 0;
+    float theta;
+    int i;
+
+    l = &cur_light_params;
+
+    if ( dl_exists ) {
+	xglDeleteLists(sky, 1);
+    } else {
+	dl_exists = 1;
+
+	/* first time through, calculate sky vertices */
+	for ( i = 0; i < 12; i++ ) {
+	    theta = (i * 30.0) * DEG_TO_RAD;
+
+	    sky_center[i][0] = cos(theta) * INNER_RADIUS;
+	    sky_center[i][1] = sin(theta) * INNER_RADIUS;
+	    sky_center[i][2] = INNER_ELEV;
+	    
+	    printf(" %.2f %.2f\n", cos(theta) * INNER_RADIUS, 
+		   sin(theta) * INNER_RADIUS);
+
+	    sky_middle[i][0] = cos((double)theta) * MIDDLE_RADIUS;
+	    sky_middle[i][1] = sin((double)theta) * MIDDLE_RADIUS;
+	    sky_middle[i][2] = MIDDLE_ELEV;
+	    
+	    sky_outer[i][0] = cos((double)theta) * OUTER_RADIUS;
+	    sky_outer[i][1] = sin((double)theta) * OUTER_RADIUS;
+	    sky_outer[i][2] = OUTER_ELEV;
+	    
+	}
+    }
+
+    printf("Creating the sky\n");
+
+    sky = xglGenLists(1);
+    xglNewList(sky, GL_COMPILE );
+
+    /* xglMaterialfv(GL_FRONT, GL_AMBIENT, l->scene_clear);
+       xglMaterialfv(GL_FRONT, GL_DIFFUSE, moon_color); */
+
+    /* Draw inner section */
+    xglBegin( GL_TRIANGLE_FAN );
+
+    xglVertex3f(0.0, 0.0, INNER_ELEV);
+
+    for ( i = 0; i < 12; i++ ) {
+	xglVertex3fv( sky_center[i] );
+    }
+
+    xglEnd();
+
+    xglEndList();
+}
+
+
+/* Draw the Sky */
+void fgSkyRender() {
+    struct fgVIEW *v;
+    /*
+    struct fgFLIGHT *f;
+    struct fgLIGHT *l;
+    struct fgTIME *t;
+    int i;
+    */
+
+    v = &current_view;
+    /*
+    f = &current_aircraft.flight;
+    l = &cur_light_params;
+    t = &cur_time_params;
+    */
+
+    /* FG_PI_2 + 0.1 is about 6 degrees after sundown and before sunrise */
+
+    /* t->sun_angle = 3.0; */ /* to force stars to be drawn (for testing) */
+
+    printf("Rendering the sky.\n");
+
+    xglDisable( GL_LIGHTING );
+
+    xglPushMatrix();
+
+    /* Translate to view position */
+    xglTranslatef( v->cur_zero_elev.x, v->cur_zero_elev.y, v->cur_zero_elev.z );
+
+    xglCallList( sky );
+
+    xglPopMatrix();
+
+    xglEnable( GL_LIGHTING );
+}
+
+
+/* $Log$
+/* Revision 1.1  1997/12/17 23:14:30  curt
+/* Initial revision.
+/* Begin work on rendering the sky. (Rather than just using a clear screen.)
+/*
+ */

Scenery/sky.h

@@ -0,0 +1,39 @@
+/**************************************************************************
+ * sky.h -- model sky with an upside down "bowl"
+ *
+ * Written by Curtis Olson, started December 1997.
+ *
+ * Copyright (C) 1997  Curtis L. Olson  - curt@infoplane.com
+ *
+ * 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)
+ **************************************************************************/
+
+
+/* (Re)generate the display list */
+void fgSkyInit();
+
+/* Draw the Sky */
+void fgSkyRender();
+
+
+/* $Log$
+/* Revision 1.1  1997/12/17 23:14:31  curt
+/* Initial revision.
+/* Begin work on rendering the sky. (Rather than just using a clear screen.)
+/*
+ */