1 /**************************************************************************
2 * GLUTmain.c -- top level sim routines
4 * Written by Curtis Olson for OpenGL, started May 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
32 #include "../XGL/xgl.h"
39 #include "../Include/constants.h"
40 #include "../Include/general.h"
42 #include "../Aircraft/aircraft.h"
43 #include "../Cockpit/cockpit.h"
44 #include "../Joystick/joystick.h"
45 #include "../Math/fg_geodesy.h"
46 #include "../Math/mat3.h"
47 #include "../Math/polar.h"
48 #include "../Scenery/mesh.h"
49 #include "../Scenery/scenery.h"
50 #include "../Scenery/sky.h"
51 #include "../Time/fg_time.h"
52 #include "../Time/fg_timer.h"
53 #include "../Time/sunpos.h"
54 #include "../Weather/weather.h"
57 /* This is a record containing global housekeeping information */
58 struct fgGENERAL general;
61 static GLfloat win_ratio = 1.0;
64 static GLfloat fgFogColor[4] = {0.65, 0.65, 0.85, 1.0};
67 /* pointer to scenery structure */
68 /* static GLint scenery, runway; */
75 /* Yet another hack. This one used by the HUD code. Michele */
79 /**************************************************************************
80 * fgInitVisuals() -- Initialize various GL/view parameters
81 **************************************************************************/
83 static void fgInitVisuals() {
88 l = &cur_light_params;
92 xglEnable( GL_DEPTH_TEST );
93 /* xglFrontFace(GL_CW); */
94 xglEnable( GL_CULL_FACE );
96 /* xglDisable( GL_DITHER ); */
98 /* If enabled, normal vectors specified with glNormal are scaled
99 to unit length after transformation. See glNormal. */
100 xglEnable( GL_NORMALIZE );
102 xglEnable( GL_LIGHTING );
103 xglEnable( GL_LIGHT0 );
104 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
106 xglShadeModel( GL_FLAT ); /* xglShadeModel( GL_SMOOTH ); */
109 xglFogi (GL_FOG_MODE, GL_LINEAR);
110 /* xglFogf (GL_FOG_START, 1.0); */
111 xglFogf (GL_FOG_END, w->visibility);
112 xglFogfv (GL_FOG_COLOR, fgFogColor);
113 /* xglFogf (GL_FOG_DENSITY, w->visibility); */
114 /* xglHint (GL_FOG_HINT, GL_FASTEST); */
116 /* initial screen color */
117 xglClearColor(0.0, 0.0, 0.0, 1.0);
121 /**************************************************************************
122 * Update the view volume, position, and orientation
123 **************************************************************************/
125 static void fgUpdateViewParams() {
131 double x_2, x_4, x_8, x_10;
132 double light, ambient, diffuse, sky_brightness;
133 /* if the 4th field is 0.0, this specifies a direction ... */
134 /* clear color (sky) */
135 GLfloat sky_color[4] = {0.60, 0.60, 0.90, 1.0};
136 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
138 f = ¤t_aircraft.flight;
139 l = &cur_light_params;
140 t = &cur_time_params;
145 /* Tell GL we are about to modify the projection parameters */
146 xglMatrixMode(GL_PROJECTION);
148 gluPerspective(55.0, 1.0/win_ratio, 1.0, 200000.0);
150 xglMatrixMode(GL_MODELVIEW);
153 /* set up our view volume */
154 gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
155 v->view_pos.x + v->view_forward[0],
156 v->view_pos.y + v->view_forward[1],
157 v->view_pos.z + v->view_forward[2],
158 v->view_up[0], v->view_up[1], v->view_up[2]);
160 /* set the sun position */
161 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
163 /* calculate lighting parameters based on sun's relative angle to
165 /* ya kind'a have to plot this to see the magic */
167 /* x = t->sun_angle^8 */
168 x_2 = l->sun_angle * l->sun_angle;
173 light = pow(1.1, -x_10 / 30.0);
174 ambient = 0.3 * light;
175 diffuse = 0.9 * light;
177 sky_brightness = 0.85 * pow(1.2, -x_8 / 20.0) + 0.15;
179 /* sky_brightness = 0.15; */ /* to force a dark sky (for testing) */
181 if ( ambient < 0.1 ) { ambient = 0.1; }
182 if ( diffuse < 0.0 ) { diffuse = 0.0; }
184 if ( sky_brightness < 0.0 ) { sky_brightness = 0.0; }
186 l->scene_ambient[0] = white[0] * ambient;
187 l->scene_ambient[1] = white[1] * ambient;
188 l->scene_ambient[2] = white[2] * ambient;
190 l->scene_diffuse[0] = white[0] * diffuse;
191 l->scene_diffuse[1] = white[1] * diffuse;
192 l->scene_diffuse[2] = white[2] * diffuse;
194 /* set lighting parameters */
195 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
196 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
199 l->scene_fog[0] = fgFogColor[0] * (ambient + diffuse);
200 l->scene_fog[1] = fgFogColor[1] * (ambient + diffuse);
201 l->scene_fog[2] = fgFogColor[2] * (ambient + diffuse);
202 l->scene_fog[3] = fgFogColor[3];
203 xglFogfv (GL_FOG_COLOR, l->scene_fog);
206 l->scene_clear[0] = sky_color[0] * sky_brightness;
207 l->scene_clear[1] = sky_color[1] * sky_brightness;
208 l->scene_clear[2] = sky_color[2] * sky_brightness;
209 l->scene_clear[3] = sky_color[3];
211 xglClearColor(l->scene_clear[0], l->scene_clear[1],
212 l->scene_clear[2], l->scene_clear[3]);
216 /**************************************************************************
217 * Update all Visuals (redraws anything graphics related)
218 **************************************************************************/
220 static void fgUpdateVisuals( void ) {
221 /* update view volume parameters */
222 fgUpdateViewParams();
224 xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
226 /* Tell GL we are switching to model view parameters */
227 xglMatrixMode(GL_MODELVIEW);
228 /* xglLoadIdentity(); */
236 /* draw astronomical objects */
249 /**************************************************************************
250 * Update internal time dependent calculations (i.e. flight model)
251 **************************************************************************/
253 void fgUpdateTimeDepCalcs(int multi_loop) {
259 f = ¤t_aircraft.flight;
260 t = &cur_time_params;
263 /* update the flight model */
264 if ( multi_loop < 0 ) {
265 multi_loop = DEFAULT_MULTILOOP;
268 /* printf("updating flight model x %d\n", multi_loop); */
269 fgFlightModelUpdate(FG_LARCSIM, f, multi_loop);
271 /* refresh shared sun position and sun_vec */
272 fgUpdateSunPos(scenery.center);
274 /* update the view angle */
275 for ( i = 0; i < multi_loop; i++ ) {
276 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
277 v->view_offset = v->goal_view_offset;
280 /* move v->view_offset towards v->goal_view_offset */
281 if ( v->goal_view_offset > v->view_offset ) {
282 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
283 v->view_offset += 0.01;
285 v->view_offset -= 0.01;
288 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
289 v->view_offset -= 0.01;
291 v->view_offset += 0.01;
294 if ( v->view_offset > FG_2PI ) {
295 v->view_offset -= FG_2PI;
296 } else if ( v->view_offset < 0 ) {
297 v->view_offset += FG_2PI;
304 void fgInitTimeDepCalcs() {
305 /* initialize timer */
308 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
314 /**************************************************************************
315 * Scenery management routines
316 **************************************************************************/
318 /* static void fgSceneryInit_OLD() { */
320 /* scenery = fgSceneryCompile_OLD();
321 runway = fgRunwayHack_OLD(0.69, 53.07);
325 /* create the scenery */
326 /* GLint fgSceneryCompile_OLD() {
329 scenery = mesh2GL(mesh_ptr_OLD);
335 /* hack in a runway */
336 /* GLint fgRunwayHack_OLD(double width, double length) {
337 static GLfloat concrete[4] = { 0.5, 0.5, 0.5, 1.0 };
338 static GLfloat line[4] = { 0.9, 0.9, 0.9, 1.0 };
341 float line_len, line_width_2, cur_pos;
343 runway = xglGenLists(1);
344 xglNewList(runway, GL_COMPILE);
347 /* xglBegin(GL_POLYGON);
348 xglMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, concrete );
349 xglNormal3f(0.0, 0.0, 1.0);
351 xglVertex3d( 0.0, -width/2.0, 0.0);
352 xglVertex3d( 0.0, width/2.0, 0.0);
353 xglVertex3d(length, width/2.0, 0.0);
354 xglVertex3d(length, -width/2.0, 0.0);
357 /* draw center line */
358 /* xglMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, line );
359 line_len = length / ( 2 * num_lines + 1);
360 printf("line_len = %.3f\n", line_len);
363 for ( i = 0; i < num_lines; i++ ) {
364 xglBegin(GL_POLYGON);
365 xglVertex3d( cur_pos, -line_width_2, 0.005);
366 xglVertex3d( cur_pos, line_width_2, 0.005);
368 xglVertex3d( cur_pos, line_width_2, 0.005);
369 xglVertex3d( cur_pos, -line_width_2, 0.005);
380 /* draw the scenery */
381 /*static void fgSceneryDraw_OLD() {
382 static float z = 32.35;
386 xglCallList(scenery);
388 printf("*** Drawing runway at %.2f\n", z);
390 xglTranslatef( -398391.28, 120070.41, 32.35);
391 xglRotatef(170.0, 0.0, 0.0, 1.0);
398 /* What should we do when we have nothing else to do? How about get
399 * ready for the next move and update the display? */
400 static void fgMainLoop( void ) {
401 static int remainder = 0;
402 int elapsed, multi_loop;
406 struct fgAIRCRAFT *a;
410 a = ¤t_aircraft;
412 t = &cur_time_params;
418 /* fgJoystickRead( &joy_x, &joy_y, &joy_b1, &joy_b2 );
419 printf( "Joystick X %f Y %f B1 %d B2 %d\n",
420 joy_x, joy_y, joy_b1, joy_b2 );
422 fgAileronSet( joy_x ); */
424 /* update the weather for our current position */
425 fgWeatherUpdate(FG_Longitude * RAD_TO_ARCSEC,
426 FG_Latitude * RAD_TO_ARCSEC,
427 FG_Altitude * FEET_TO_METER);
429 /* Calculate model iterations needed */
430 elapsed = fgGetTimeInterval();
431 printf("Time interval is = %d, previous remainder is = %d\n", elapsed,
433 printf("--> Frame rate is = %.2f\n", 1000.0 / (float)elapsed);
434 elapsed += remainder;
436 multi_loop = ((float)elapsed * 0.001) * DEFAULT_MODEL_HZ;
437 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
438 printf("Model iterations needed = %d, new remainder = %d\n", multi_loop,
441 if ( ! use_signals ) {
443 fgUpdateTimeDepCalcs(multi_loop);
446 /* I'm just sticking this here for now, it should probably move
448 cur_elev = mesh_altitude(FG_Longitude * RAD_TO_ARCSEC,
449 FG_Latitude * RAD_TO_ARCSEC);
450 printf("Ground elevation is %.2f meters here.\n", cur_elev);
451 /* FG_Runway_altitude = cur_elev * METER_TO_FEET; */
453 if ( FG_Altitude * FEET_TO_METER < cur_elev + 3.758099) {
454 /* set this here, otherwise if we set runway height above our
455 current height we get a really nasty bounce. */
456 FG_Runway_altitude = FG_Altitude - 3.758099;
458 /* now set aircraft altitude above ground */
459 FG_Altitude = cur_elev * METER_TO_FEET + 3.758099;
460 printf("<*> resetting altitude to %.0f meters\n",
461 FG_Altitude * FEET_TO_METER);
464 fgAircraftOutputCurrent(a);
471 /**************************************************************************
472 * Handle new window size or exposure
473 **************************************************************************/
475 static void fgReshape( int width, int height ) {
476 /* Do this so we can call fgReshape(0,0) ourselves without having to know
477 * what the values of width & height are. */
478 if ( (height > 0) && (width > 0) ) {
479 win_ratio = (GLfloat) height / (GLfloat) width;
482 /* Inform gl of our view window size */
483 xglViewport(0, 0, (GLint)width, (GLint)height);
485 fgUpdateViewParams();
487 xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
491 /**************************************************************************
493 **************************************************************************/
495 int main( int argc, char *argv[] ) {
498 f = ¤t_aircraft.flight;
500 printf("Flight Gear: prototype version %s\n\n", VERSION);
502 /**********************************************************************
503 * Initialize the Window/Graphics environment.
504 **********************************************************************/
507 /* initialize GLUT */
508 xglutInit(&argc, argv);
510 /* Define Display Parameters */
511 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
513 /* Define initial window size */
514 xglutInitWindowSize(640, 480);
516 /* Initialize windows */
517 xglutCreateWindow("Flight Gear");
520 /* This is the general house keeping init routine */
523 /* This is the top level init routine which calls all the other
524 * subsystem initialization routines. If you are adding a
525 * subsystem to flight gear, its initialization call should
526 * located in this routine.*/
529 /* setup view parameters, only makes GL calls */
533 /* init timer routines, signals, etc. Arrange for an alarm
534 signal to be generated, etc. */
535 fgInitTimeDepCalcs();
538 /**********************************************************************
539 * Initialize the Event Handlers.
540 **********************************************************************/
543 /* call fgReshape() on window resizes */
544 xglutReshapeFunc( fgReshape );
546 /* call key() on keyboard event */
547 xglutKeyboardFunc( GLUTkey );
548 glutSpecialFunc( GLUTspecialkey );
550 /* call fgMainLoop() whenever there is nothing else to do */
551 xglutIdleFunc( fgMainLoop );
554 xglutDisplayFunc( fgUpdateVisuals );
556 /* pass control off to the GLUT event handler */
566 int printf (const char *format, ...) {
572 /* Revision 1.34 1997/12/17 23:13:34 curt
573 /* Began working on rendering a sky.
575 * Revision 1.33 1997/12/15 23:54:45 curt
576 * Add xgl wrappers for debugging.
577 * Generate terrain normals on the fly.
579 * Revision 1.32 1997/12/15 20:59:08 curt
582 * Revision 1.31 1997/12/12 21:41:25 curt
583 * More light/material property tweaking ... still a ways off.
585 * Revision 1.30 1997/12/12 19:52:47 curt
586 * Working on lightling and material properties.
588 * Revision 1.29 1997/12/11 04:43:54 curt
589 * Fixed sun vector and lighting problems. I thing the moon is now lit
592 * Revision 1.28 1997/12/10 22:37:45 curt
593 * Prepended "fg" on the name of all global structures that didn't have it yet.
594 * i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
596 * Revision 1.27 1997/12/09 05:11:54 curt
597 * Working on tweaking lighting.
599 * Revision 1.26 1997/12/09 04:25:29 curt
600 * Working on adding a global lighting params structure.
602 * Revision 1.25 1997/12/08 22:54:09 curt
603 * Enabled GL_CULL_FACE.
605 * Revision 1.24 1997/11/25 19:25:32 curt
606 * Changes to integrate Durk's moon/sun code updates + clean up.
608 * Revision 1.23 1997/11/15 18:16:34 curt
611 * Revision 1.22 1997/10/30 12:38:41 curt
612 * Working on new scenery subsystem.
614 * Revision 1.21 1997/09/23 00:29:38 curt
615 * Tweaks to get things to compile with gcc-win32.
617 * Revision 1.20 1997/09/22 14:44:19 curt
618 * Continuing to try to align stars correctly.
620 * Revision 1.19 1997/09/18 16:20:08 curt
621 * At dusk/dawn add/remove stars in stages.
623 * Revision 1.18 1997/09/16 22:14:51 curt
624 * Tweaked time of day lighting equations. Don't draw stars during the day.
626 * Revision 1.17 1997/09/16 15:50:29 curt
627 * Working on star alignment and time issues.
629 * Revision 1.16 1997/09/13 02:00:06 curt
630 * Mostly working on stars and generating sidereal time for accurate star
633 * Revision 1.15 1997/09/05 14:17:27 curt
634 * More tweaking with stars.
636 * Revision 1.14 1997/09/05 01:35:53 curt
637 * Working on getting stars right.
639 * Revision 1.13 1997/09/04 02:17:34 curt
642 * Revision 1.12 1997/08/27 21:32:24 curt
643 * Restructured view calculation code. Added stars.
645 * Revision 1.11 1997/08/27 03:30:16 curt
646 * Changed naming scheme of basic shared structures.
648 * Revision 1.10 1997/08/25 20:27:22 curt
649 * Merged in initial HUD and Joystick code.
651 * Revision 1.9 1997/08/22 21:34:39 curt
652 * Doing a bit of reorganizing and house cleaning.
654 * Revision 1.8 1997/08/19 23:55:03 curt
655 * Worked on better simulating real lighting.
657 * Revision 1.7 1997/08/16 12:22:38 curt
658 * Working on improving the lighting/shading.
660 * Revision 1.6 1997/08/13 20:24:56 curt
661 * Changes due to changing sunpos interface.
663 * Revision 1.5 1997/08/06 21:08:32 curt
664 * Sun position now *really* works (I think) ... I still have sun time warping
665 * code in place, probably should remove it soon.
667 * Revision 1.4 1997/08/06 15:41:26 curt
668 * Working on correct sun position.
670 * Revision 1.3 1997/08/06 00:24:22 curt
671 * Working on correct real time sun lighting.
673 * Revision 1.2 1997/08/04 20:25:15 curt
674 * Organizational tweaking.
676 * Revision 1.1 1997/08/02 18:45:00 curt
677 * Renamed GLmain.c GLUTmain.c
679 * Revision 1.43 1997/08/02 16:23:47 curt
682 * Revision 1.42 1997/08/01 19:43:33 curt
683 * Making progress with coordinate system overhaul.
685 * Revision 1.41 1997/07/31 22:52:37 curt
686 * Working on redoing internal coordinate systems & scenery transformations.
688 * Revision 1.40 1997/07/30 16:12:42 curt
689 * Moved fg_random routines from Util/ to Math/
691 * Revision 1.39 1997/07/21 14:45:01 curt
694 * Revision 1.38 1997/07/19 23:04:47 curt
695 * Added an initial weather section.
697 * Revision 1.37 1997/07/19 22:34:02 curt
698 * Moved PI definitions to ../constants.h
699 * Moved random() stuff to ../Utils/ and renamed fg_random()
701 * Revision 1.36 1997/07/18 23:41:25 curt
702 * Tweaks for building with Cygnus Win32 compiler.
704 * Revision 1.35 1997/07/18 14:28:34 curt
705 * Hacked in some support for wind/turbulence.
707 * Revision 1.34 1997/07/16 20:04:48 curt
708 * Minor tweaks to aid Win32 port.
710 * Revision 1.33 1997/07/12 03:50:20 curt
711 * Added an #include <Windows32/Base.h> to help compiling for Win32
713 * Revision 1.32 1997/07/11 03:23:18 curt
714 * Solved some scenery display/orientation problems. Still have a positioning
715 * (or transformation?) problem.
717 * Revision 1.31 1997/07/11 01:29:58 curt
718 * More tweaking of terrian floor.
720 * Revision 1.30 1997/07/10 04:26:37 curt
721 * We now can interpolated ground elevation for any position in the grid. We
722 * can use this to enforce a "hard" ground. We still need to enforce some
723 * bounds checking so that we don't try to lookup data points outside the
726 * Revision 1.29 1997/07/09 21:31:12 curt
727 * Working on making the ground "hard."
729 * Revision 1.28 1997/07/08 18:20:12 curt
730 * Working on establishing a hard ground.
732 * Revision 1.27 1997/07/07 20:59:49 curt
733 * Working on scenery transformations to enable us to fly fluidly over the
734 * poles with no discontinuity/distortion in scenery.
736 * Revision 1.26 1997/07/05 20:43:34 curt
737 * renamed mat3 directory to Math so we could add other math related routines.
739 * Revision 1.25 1997/06/29 21:19:17 curt
740 * Working on scenery management system.
742 * Revision 1.24 1997/06/26 22:14:53 curt
743 * Beginning work on a scenery management system.
745 * Revision 1.23 1997/06/26 19:08:33 curt
746 * Restructuring make, adding automatic "make dep" support.
748 * Revision 1.22 1997/06/25 15:39:47 curt
749 * Minor changes to compile with rsxnt/win32.
751 * Revision 1.21 1997/06/22 21:44:41 curt
752 * Working on intergrating the VRML (subset) parser.
754 * Revision 1.20 1997/06/21 17:12:53 curt
755 * Capitalized subdirectory names.
757 * Revision 1.19 1997/06/18 04:10:31 curt
758 * A couple more runway tweaks ...
760 * Revision 1.18 1997/06/18 02:21:24 curt
763 * Revision 1.17 1997/06/17 16:51:58 curt
764 * Timer interval stuff now uses gettimeofday() instead of ftime()
766 * Revision 1.16 1997/06/17 04:19:16 curt
767 * More timer related tweaks with respect to view direction changes.
769 * Revision 1.15 1997/06/17 03:41:10 curt
770 * Nonsignal based interval timing is now working.
771 * This would be a good time to look at cleaning up the code structure a bit.
773 * Revision 1.14 1997/06/16 19:32:51 curt
774 * Starting to add general timer support.
776 * Revision 1.13 1997/06/02 03:40:06 curt
777 * A tiny bit more view tweaking.
779 * Revision 1.12 1997/06/02 03:01:38 curt
780 * Working on views (side, front, back, transitions, etc.)
782 * Revision 1.11 1997/05/31 19:16:25 curt
783 * Elevator trim added.
785 * Revision 1.10 1997/05/31 04:13:52 curt
788 * Continuing work on the LaRCsim flight model integration.
789 * Added some MSFS-like keyboard input handling.
791 * Revision 1.9 1997/05/30 19:27:01 curt
792 * The LaRCsim flight model is starting to look like it is working.
794 * Revision 1.8 1997/05/30 03:54:10 curt
795 * Made a bit more progress towards integrating the LaRCsim flight model.
797 * Revision 1.7 1997/05/29 22:39:49 curt
798 * Working on incorporating the LaRCsim flight model.
800 * Revision 1.6 1997/05/29 12:31:39 curt
801 * Minor tweaks, moving towards general flight model integration.
803 * Revision 1.5 1997/05/29 02:33:23 curt
804 * Updated to reflect changing interfaces in other "modules."
806 * Revision 1.4 1997/05/27 17:44:31 curt
807 * Renamed & rearranged variables and routines. Added some initial simple
808 * timer/alarm routines so the flight model can be updated on a regular
811 * Revision 1.3 1997/05/23 15:40:25 curt
812 * Added GNU copyright headers.
815 * Revision 1.2 1997/05/23 00:35:12 curt
816 * Trying to get fog to work ...
818 * Revision 1.1 1997/05/21 15:57:51 curt
819 * Renamed due to added GLUT support.
821 * Revision 1.3 1997/05/19 18:22:42 curt
822 * Parameter tweaking ... starting to stub in fog support.
824 * Revision 1.2 1997/05/17 00:17:34 curt
825 * Trying to stub in support for standard OpenGL.
827 * Revision 1.1 1997/05/16 16:05:52 curt