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flightgear/Main/GLUTkey.cxx
curt 16d135954c When "Help" is selected from the menu check to see if netscape is running. 
If so, command it to go to the flight gear user guide url.  Otherwise
start a new version of netscape with this url.
1999-03-11 23:09:26 +00:00

737 lines
22 KiB
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// GLUTkey.cxx -- handle GLUT keyboard events
//
// Written by Curtis Olson, started May 1997.
//
// Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
//
// 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 HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <GL/glut.h>
#include <XGL/xgl.h>
#if defined(FX) && defined(XMESA)
#include <GL/xmesa.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <Debug/logstream.hxx>
#include <Aircraft/aircraft.hxx>
#include <Astro/solarsystem.hxx>
#include <Astro/sky.hxx>
#include <Autopilot/autopilot.hxx>
#include <Cockpit/hud.hxx>
#include <GUI/gui.h>
#include <Include/fg_constants.h>
#include <Objects/material.hxx>
#include <PUI/pu.h>
#include <Time/light.hxx>
#include <Weather/weather.hxx>
#include "GLUTkey.hxx"
#include "options.hxx"
#include "views.hxx"
// Force an update of the sky and lighting parameters
static void local_update_sky_and_lighting_params( void ) {
// fgSunInit();
SolarSystem::theSolarSystem->rebuild();
cur_light_params.Update();
fgSkyColorsInit();
}
// Handle keyboard events
void GLUTkey(unsigned char k, int x, int y) {
FGInterface *f;
fgTIME *t;
FGView *v;
FGWeather *w;
float fov, tmp;
static bool winding_ccw = true;
f = current_aircraft.fdm_state;
t = &cur_time_params;
v = &current_view;
w = &current_weather;
FG_LOG( FG_INPUT, FG_DEBUG, "Key hit = " << k );
puKeyboard(k, PU_DOWN );
if ( GLUT_ACTIVE_ALT && glutGetModifiers() ) {
FG_LOG( FG_INPUT, FG_DEBUG, " SHIFTED" );
switch (k) {
case 1: // Ctrl-A key
fgAPToggleAltitude();
return;
case 8: // Ctrl-H key
fgAPToggleHeading();
return;
case 18: // Ctrl-R key
// temporary
winding_ccw = !winding_ccw;
if ( winding_ccw ) {
glFrontFace ( GL_CCW );
} else {
glFrontFace ( GL_CW );
}
return;
case 19: // Ctrl-S key
fgAPToggleAutoThrottle();
return;
case 20: // Ctrl-T key
fgAPToggleTerrainFollow();
return;
case 49: // numeric keypad 1
v->set_goal_view_offset( FG_PI * 0.75 );
return;
case 50: // numeric keypad 2
v->set_goal_view_offset( FG_PI );
return;
case 51: // numeric keypad 3
v->set_goal_view_offset( FG_PI * 1.25 );
return;
case 52: // numeric keypad 4
v->set_goal_view_offset( FG_PI * 0.50 );
return;
case 54: // numeric keypad 6
v->set_goal_view_offset( FG_PI * 1.50 );
return;
case 55: // numeric keypad 7
v->set_goal_view_offset( FG_PI * 0.25 );
return;
case 56: // numeric keypad 8
v->set_goal_view_offset( 0.00 );
return;
case 57: // numeric keypad 9
v->set_goal_view_offset( FG_PI * 1.75 );
return;
case 72: // H key
// status = current_options.get_hud_status();
// current_options.set_hud_status(!status);
HUD_brightkey( true );
return;
case 73: // i key
// Minimal Hud
fgHUDInit2(&current_aircraft);
return;
case 77: // M key
t->warp -= 60;
local_update_sky_and_lighting_params();
return;
case 84: // T key
t->warp_delta -= 30;
local_update_sky_and_lighting_params();
return;
case 87: // W key
#if defined(FX) && !defined(WIN32)
global_fullscreen = ( !global_fullscreen );
# if defined(XMESA_FX_FULLSCREEN) && defined(XMESA_FX_WINDOW)
XMesaSetFXmode( global_fullscreen ?
XMESA_FX_FULLSCREEN : XMESA_FX_WINDOW );
# endif
#endif
return;
case 88: // X key
fov = current_options.get_fov();
fov *= 1.05;
if ( fov > FG_FOV_MAX ) {
fov = FG_FOV_MAX;
}
current_options.set_fov(fov);
v->force_update_fov_math();
return;
case 90: // Z key
tmp = w->get_visibility(); // in meters
tmp /= 1.10;
w->set_visibility( tmp );
return;
}
} else {
FG_LOG( FG_INPUT, FG_DEBUG, "" );
switch (k) {
case 50: // numeric keypad 2
if( fgAPAltitudeEnabled() ) {
fgAPAltitudeAdjust( 100 );
} else {
controls.move_elevator(-0.05);
}
return;
case 56: // numeric keypad 8
if( fgAPAltitudeEnabled() ) {
fgAPAltitudeAdjust( -100 );
} else {
controls.move_elevator(0.05);
}
return;
case 49: // numeric keypad 1
controls.move_elevator_trim(-0.001);
return;
case 55: // numeric keypad 7
controls.move_elevator_trim(0.001);
return;
case 52: // numeric keypad 4
controls.move_aileron(-0.05);
return;
case 54: // numeric keypad 6
controls.move_aileron(0.05);
return;
case 48: // numeric keypad Ins
if( fgAPHeadingEnabled() ) {
fgAPHeadingAdjust( -1 );
} else {
controls.move_rudder(-0.05);
}
return;
case 13: // numeric keypad Enter
if( fgAPHeadingEnabled() ) {
fgAPHeadingAdjust( 1 );
} else {
controls.move_rudder(0.05);
}
return;
case 53: // numeric keypad 5
controls.set_aileron(0.0);
controls.set_elevator(0.0);
controls.set_rudder(0.0);
return;
case 57: // numeric keypad 9 (Pg Up)
if( fgAPAutoThrottleEnabled() ) {
fgAPAutoThrottleAdjust( 5 );
} else {
controls.move_throttle( FGControls::ALL_ENGINES, 0.01 );
}
return;
case 51: // numeric keypad 3 (Pg Dn)
if( fgAPAutoThrottleEnabled() ) {
fgAPAutoThrottleAdjust( -5 );
} else {
controls.move_throttle( FGControls::ALL_ENGINES, -0.01 );
}
return;
case 98: // b key
int b_ret;
double b_set;
b_ret = int( controls.get_brake( 0 ) );
b_set = double(!b_ret);
controls.set_brake( FGControls::ALL_WHEELS, b_set);
return;
case 104: // h key
HUD_brightkey( false );
return;
case 105: // i key
fgHUDInit(&current_aircraft); // normal HUD
return;
case 109: // m key
t->warp += 60;
local_update_sky_and_lighting_params();
return;
case 112: // p key
t->pause = !t->pause;
// printf position and attitude information
FG_LOG( FG_INPUT, FG_INFO,
"Lon = " << f->get_Longitude() * RAD_TO_DEG
<< " Lat = " << f->get_Latitude() * RAD_TO_DEG
<< " Altitude = " << f->get_Altitude() * FEET_TO_METER );
FG_LOG( FG_INPUT, FG_INFO,
"Heading = " << f->get_Psi() * RAD_TO_DEG
<< " Roll = " << f->get_Phi() * RAD_TO_DEG
<< " Pitch = " << f->get_Theta() * RAD_TO_DEG );
return;
case 116: // t key
t->warp_delta += 30;
local_update_sky_and_lighting_params();
return;
case 120: // X key
fov = current_options.get_fov();
fov /= 1.05;
if ( fov < FG_FOV_MIN ) {
fov = FG_FOV_MIN;
}
current_options.set_fov(fov);
v->force_update_fov_math();
return;
case 122: // z key
tmp = w->get_visibility(); // in meters
tmp *= 1.10;
w->set_visibility( tmp );
return;
case 27: // ESC
// if( fg_DebugOutput ) {
// fclose( fg_DebugOutput );
// }
FG_LOG( FG_INPUT, FG_ALERT,
"Program exiting normally at user request." );
exit(-1);
}
}
}
// Handle "special" keyboard events
void GLUTspecialkey(int k, int x, int y) {
FGView *v;
v = &current_view;
FG_LOG( FG_INPUT, FG_DEBUG, "Special key hit = " << k );
puKeyboard(k + PU_KEY_GLUT_SPECIAL_OFFSET, PU_DOWN);
if ( GLUT_ACTIVE_SHIFT && glutGetModifiers() ) {
FG_LOG( FG_INPUT, FG_DEBUG, " SHIFTED" );
switch (k) {
case GLUT_KEY_END: // numeric keypad 1
v->set_goal_view_offset( FG_PI * 0.75 );
return;
case GLUT_KEY_DOWN: // numeric keypad 2
v->set_goal_view_offset( FG_PI );
return;
case GLUT_KEY_PAGE_DOWN: // numeric keypad 3
v->set_goal_view_offset( FG_PI * 1.25 );
return;
case GLUT_KEY_LEFT: // numeric keypad 4
v->set_goal_view_offset( FG_PI * 0.50 );
return;
case GLUT_KEY_RIGHT: // numeric keypad 6
v->set_goal_view_offset( FG_PI * 1.50 );
return;
case GLUT_KEY_HOME: // numeric keypad 7
v->set_goal_view_offset( FG_PI * 0.25 );
return;
case GLUT_KEY_UP: // numeric keypad 8
v->set_goal_view_offset( 0.00 );
return;
case GLUT_KEY_PAGE_UP: // numeric keypad 9
v->set_goal_view_offset( FG_PI * 1.75 );
return;
}
} else {
FG_LOG( FG_INPUT, FG_DEBUG, "" );
switch (k) {
case GLUT_KEY_F8: // F8 toggles fog ... off fastest nicest...
current_options.cycle_fog();
if ( current_options.get_fog() == fgOPTIONS::FG_FOG_DISABLED ) {
FG_LOG( FG_INPUT, FG_INFO, "Fog disabled" );
} else if ( current_options.get_fog() ==
fgOPTIONS::FG_FOG_FASTEST )
{
FG_LOG( FG_INPUT, FG_INFO,
"Fog enabled, hint set to fastest" );
} else if ( current_options.get_fog() ==
fgOPTIONS::FG_FOG_NICEST )
{
FG_LOG( FG_INPUT, FG_INFO,
"Fog enabled, hint set to nicest" );
}
return;
case GLUT_KEY_F9: // F9 toggles textures on and off...
if ( material_mgr.get_textures_loaded() ) {
current_options.get_textures() ?
current_options.set_textures(false) :
current_options.set_textures(true);
FG_LOG( FG_INPUT, FG_INFO, "Toggling texture" );
} else {
FG_LOG( FG_INPUT, FG_INFO,
"No textures loaded, cannot toggle" );
}
return;
case GLUT_KEY_F10: // F10 toggles menu on and off...
FG_LOG(FG_INPUT, FG_INFO, "Invoking call back function");
hideMenuButton ->
setValue ((int) !(hideMenuButton -> getValue() ) );
hideMenuButton -> invokeCallback();
//exit(1);
return;
case GLUT_KEY_UP:
if( fgAPAltitudeEnabled() ) {
fgAPAltitudeAdjust( -100 );
} else {
controls.move_elevator(0.05);
}
return;
case GLUT_KEY_DOWN:
if( fgAPAltitudeEnabled() ) {
fgAPAltitudeAdjust( 100 );
} else {
controls.move_elevator(-0.05);
}
return;
case GLUT_KEY_LEFT:
controls.move_aileron(-0.05);
return;
case GLUT_KEY_RIGHT:
controls.move_aileron(0.05);
return;
case GLUT_KEY_HOME: // numeric keypad 1
controls.move_elevator_trim(0.001);
return;
case GLUT_KEY_END: // numeric keypad 7
controls.move_elevator_trim(-0.001);
return;
case GLUT_KEY_INSERT: // numeric keypad Ins
if( fgAPHeadingEnabled() ) {
fgAPHeadingAdjust( -1 );
} else {
controls.move_rudder(-0.05);
}
return;
case 13: // numeric keypad Enter
if( fgAPHeadingEnabled() ) {
fgAPHeadingAdjust( 1 );
} else {
controls.move_rudder(0.05);
}
return;
case 53: // numeric keypad 5
controls.set_aileron(0.0);
controls.set_elevator(0.0);
controls.set_rudder(0.0);
return;
case GLUT_KEY_PAGE_UP: // numeric keypad 9 (Pg Up)
if( fgAPAutoThrottleEnabled() ) {
fgAPAutoThrottleAdjust( 5 );
} else {
controls.move_throttle( FGControls::ALL_ENGINES, 0.01 );
}
return;
case GLUT_KEY_PAGE_DOWN: // numeric keypad 3 (Pg Dn)
if( fgAPAutoThrottleEnabled() ) {
fgAPAutoThrottleAdjust( -5 );
} else {
controls.move_throttle( FGControls::ALL_ENGINES, -0.01 );
}
return;
}
}
}
// $Log$
// Revision 1.43 1999/03/11 23:09:46 curt
// When "Help" is selected from the menu check to see if netscape is running.
// If so, command it to go to the flight gear user guide url. Otherwise
// start a new version of netscape with this url.
//
// Revision 1.42 1999/02/26 22:09:46 curt
// Added initial support for native SGI compilers.
//
// Revision 1.41 1999/02/12 23:22:43 curt
// Allow auto-throttle adjustment while active.
//
// Revision 1.40 1999/02/12 22:17:59 curt
// Changes to allow adjustment of the autopilot settings while it is activated.
//
// Revision 1.39 1999/02/05 21:29:07 curt
// Modifications to incorporate Jon S. Berndts flight model code.
//
// Revision 1.38 1998/12/11 20:26:25 curt
// Fixed view frustum culling accuracy bug so we can look out the sides and
// back without tri-stripes dropping out.
//
// Revision 1.37 1998/12/09 18:50:22 curt
// Converted "class fgVIEW" to "class FGView" and updated to make data
// members private and make required accessor functions.
//
// Revision 1.36 1998/12/06 13:51:20 curt
// Turned "struct fgWEATHER" into "class FGWeather".
//
// Revision 1.35 1998/12/05 16:13:17 curt
// Renamed class fgCONTROLS to class FGControls.
//
// Revision 1.34 1998/12/05 15:54:17 curt
// Renamed class fgFLIGHT to class FGState as per request by JSB.
//
// Revision 1.33 1998/12/03 01:17:12 curt
// Converted fgFLIGHT to a class.
//
// Revision 1.32 1998/11/06 21:18:06 curt
// Converted to new logstream debugging facility. This allows release
// builds with no messages at all (and no performance impact) by using
// the -DFG_NDEBUG flag.
//
// Revision 1.31 1998/11/02 18:25:37 curt
// Check for __CYGWIN__ (b20) as well as __CYGWIN32__ (pre b20 compilers)
// Other misc. tweaks.
//
// Revision 1.30 1998/10/25 14:08:46 curt
// Turned "struct fgCONTROLS" into a class, with inlined accessor functions.
//
// Revision 1.29 1998/10/20 14:58:57 curt
// Ctrl-R now reverses default polygon winding so I can see if a hole in the
// terrain is a result of improper winding, or if it is just an empty hole.
//
// Revision 1.28 1998/10/17 01:34:20 curt
// C++ ifying ...
//
// Revision 1.27 1998/10/02 12:46:46 curt
// Added an "auto throttle"
//
// Revision 1.26 1998/10/01 00:38:04 curt
// More altitude hold tweaks.
//
// Revision 1.25 1998/09/29 02:03:36 curt
// Autopilot mods.
//
// Revision 1.24 1998/09/26 13:16:44 curt
// C++-ified the comments.
//
// Revision 1.23 1998/09/17 18:35:30 curt
// Added F8 to toggle fog and F9 to toggle texturing.
//
// Revision 1.22 1998/09/15 04:27:27 curt
// Changes for new Astro code.
//
// Revision 1.21 1998/08/29 13:09:25 curt
// Changes to event manager from Bernie Bright.
//
// Revision 1.20 1998/08/24 20:11:12 curt
// Added i/I to toggle full vs. minimal HUD.
// Added a --hud-tris vs --hud-culled option.
// Moved options accessor funtions to options.hxx.
//
// Revision 1.19 1998/08/05 00:19:33 curt
// Added a local routine to update lighting params every frame when time is
// accelerated.
//
// Revision 1.18 1998/07/30 23:48:24 curt
// Output position & orientation when pausing.
// Eliminated libtool use.
// Added options to specify initial position and orientation.
// Changed default fov to 55 degrees.
// Added command line option to start in paused or unpaused state.
//
// Revision 1.17 1998/07/27 18:41:23 curt
// Added a pause command "p"
// Fixed some initialization order problems between pui and glut.
// Added an --enable/disable-sound option.
//
// Revision 1.16 1998/07/16 17:33:34 curt
// "H" / "h" now control hud brightness as well with off being one of the
// states.
// Better checking for xmesa/fx 3dfx fullscreen/window support for deciding
// whether or not to build in the feature.
// Translucent menu support.
// HAVE_AUDIO_SUPPORT -> ENABLE_AUDIO_SUPPORT
// Use fork() / wait() for playing mp3 init music in background under unix.
// Changed default tile diameter to 5.
//
// Revision 1.15 1998/07/13 21:01:34 curt
// Wrote access functions for current fgOPTIONS.
//
// Revision 1.14 1998/07/06 02:42:02 curt
// Added support for switching between fullscreen and window mode for
// Mesa/3dfx/glide.
//
// Added a basic splash screen. Restructured the main loop and top level
// initialization routines to do this.
//
// Hacked in some support for playing a startup mp3 sound file while rest
// of sim initializes. Currently only works in Unix using the mpg123 player.
// Waits for the mpg123 player to finish before initializing internal
// sound drivers.
//
// Revision 1.13 1998/06/27 16:54:32 curt
// Replaced "extern displayInstruments" with a entry in fgOPTIONS.
// Don't change the view port when displaying the panel.
//
// Revision 1.12 1998/06/12 14:27:26 curt
// Pui -> PUI, Gui -> GUI.
//
// Revision 1.11 1998/06/12 00:57:38 curt
// Added support for Pui/Gui.
// Converted fog to GL_FOG_EXP2.
// Link to static simulator parts.
// Update runfg.bat to try to be a little smarter.
//
// Revision 1.10 1998/05/27 02:24:05 curt
// View optimizations by Norman Vine.
//
// Revision 1.9 1998/05/16 13:05:21 curt
// Added limits to fov.
//
// Revision 1.8 1998/05/13 18:29:56 curt
// Added a keyboard binding to dynamically adjust field of view.
// Added a command line option to specify fov.
// Adjusted terrain color.
// Root path info moved to fgOPTIONS.
// Added ability to parse options out of a config file.
//
// Revision 1.7 1998/05/07 23:14:14 curt
// Added "D" key binding to set autopilot heading.
// Made frame rate calculation average out over last 10 frames.
// Borland C++ floating point exception workaround.
// Added a --tile-radius=n option.
//
// Revision 1.6 1998/04/28 01:20:20 curt
// Type-ified fgTIME and fgVIEW.
// Added a command line option to disable textures.
//
// Revision 1.5 1998/04/25 22:06:29 curt
// Edited cvs log messages in source files ... bad bad bad!
//
// Revision 1.4 1998/04/25 20:24:00 curt
// Cleaned up initialization sequence to eliminate interdependencies
// between sun position, lighting, and view position. This creates a
// valid single pass initialization path.
//
// Revision 1.3 1998/04/24 14:19:29 curt
// Fog tweaks.
//
// Revision 1.2 1998/04/24 00:49:17 curt
// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
// Trying out some different option parsing code.
// Some code reorganization.
//
// Revision 1.1 1998/04/22 13:25:40 curt
// C++ - ifing the code.
// Starting a bit of reorganization of lighting code.
//
// Revision 1.33 1998/04/18 04:11:25 curt
// Moved fg_debug to it's own library, added zlib support.
//
// Revision 1.32 1998/04/14 02:21:01 curt
// Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
// <jgoeke@voyager.net>
//
// Revision 1.31 1998/04/08 23:34:05 curt
// Patch from Durk to fix trim reversal with numlock key active.
//
// Revision 1.30 1998/04/03 22:09:02 curt
// Converting to Gnu autoconf system.
//
// Revision 1.29 1998/02/07 15:29:40 curt
// Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
// <chotchkiss@namg.us.anritsu.com>
//
// Revision 1.28 1998/02/03 23:20:23 curt
// Lots of little tweaks to fix various consistency problems discovered by
// Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
// passed arguments along to the real printf(). Also incorporated HUD changes
// by Michele America.
//
// Revision 1.27 1998/01/27 00:47:55 curt
// Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
// system and commandline/config file processing code.
//
// Revision 1.26 1998/01/19 19:27:07 curt
// Merged in make system changes from Bob Kuehne <rpk@sgi.com>
// This should simplify things tremendously.
//
// Revision 1.25 1998/01/05 18:44:34 curt
// Add an option to advance/decrease time from keyboard.
//
// Revision 1.24 1997/12/30 16:36:46 curt
// Merged in Durk's changes ...
//
// Revision 1.23 1997/12/15 23:54:44 curt
// Add xgl wrappers for debugging.
// Generate terrain normals on the fly.
//
// Revision 1.22 1997/12/10 22:37:45 curt
// Prepended "fg" on the name of all global structures that didn't have it yet.
// i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
//
// Revision 1.21 1997/08/27 21:32:23 curt
// Restructured view calculation code. Added stars.
//
// Revision 1.20 1997/08/27 03:30:13 curt
// Changed naming scheme of basic shared structures.
//
// Revision 1.19 1997/08/25 20:27:21 curt
// Merged in initial HUD and Joystick code.
//
// Revision 1.18 1997/08/22 21:34:38 curt
// Doing a bit of reorganizing and house cleaning.
//
// Revision 1.17 1997/07/19 22:34:02 curt
// Moved PI definitions to ../constants.h
// Moved random() stuff to ../Utils/ and renamed fg_random()
//
// Revision 1.16 1997/07/18 23:41:24 curt
// Tweaks for building with Cygnus Win32 compiler.
//
// Revision 1.15 1997/07/16 20:04:47 curt
// Minor tweaks to aid Win32 port.
//
// Revision 1.14 1997/07/12 03:50:20 curt
// Added an #include <Windows32/Base.h> to help compiling for Win32
//
// Revision 1.13 1997/06/25 15:39:46 curt
// Minor changes to compile with rsxnt/win32.
//
// Revision 1.12 1997/06/21 17:12:52 curt
// Capitalized subdirectory names.
//
// Revision 1.11 1997/06/18 04:10:31 curt
// A couple more runway tweaks ...
//
// Revision 1.10 1997/06/18 02:21:23 curt
// Hacked in a runway
//
// Revision 1.9 1997/06/02 03:40:06 curt
// A tiny bit more view tweaking.
//
// Revision 1.8 1997/06/02 03:01:38 curt
// Working on views (side, front, back, transitions, etc.)
//
// Revision 1.7 1997/05/31 19:16:25 curt
// Elevator trim added.
//
// Revision 1.6 1997/05/31 04:13:52 curt
// WE CAN NOW FLY!!!
//
// Continuing work on the LaRCsim flight model integration.
// Added some MSFS-like keyboard input handling.
//
// Revision 1.5 1997/05/30 23:26:19 curt
// Added elevator/aileron controls.
//
// Revision 1.4 1997/05/27 17:44:31 curt
// Renamed & rearranged variables and routines. Added some initial simple
// timer/alarm routines so the flight model can be updated on a regular
// interval.
//
// Revision 1.3 1997/05/23 15:40:25 curt
// Added GNU copyright headers.
// Fog now works!
//
// Revision 1.2 1997/05/23 00:35:12 curt
// Trying to get fog to work ...
//
// Revision 1.1 1997/05/21 15:57:50 curt
// Renamed due to added GLUT support.
//
// Revision 1.2 1997/05/19 18:22:41 curt
// Parameter tweaking ... starting to stub in fog support.
//
// Revision 1.1 1997/05/16 16:05:51 curt
// Initial revision.
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