2 // options.cxx -- class to handle command line options
4 // Written by Curtis Olson, started April 1998.
6 // Copyright (C) 1998 Curtis L. Olson - curt@me.umn.edu
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)
30 #include <math.h> // rint()
32 #include <stdlib.h> // atof(), atoi()
35 #include <Debug/fg_debug.h>
36 #include <Include/fg_constants.h>
37 #include <Include/fg_zlib.h>
39 #include "options.hxx"
42 // Defined the shared options class here
43 fgOPTIONS current_options;
47 fgOPTIONS::fgOPTIONS( void ) {
48 // set initial values/defaults
50 if ( getenv("FG_ROOT") != NULL ) {
51 // fg_root could be anywhere, so default to environmental
52 // variable $FG_ROOT if it is set.
54 strcpy(fg_root, getenv("FG_ROOT"));
56 // Otherwise, default to a random compiled in location if
57 // $FG_ROOT is not set. This can still be overridden from the
58 // command line or a config file.
61 strcpy(fg_root, "\\FlightGear");
63 strcpy(fg_root, "/usr/local/lib/FlightGear");
68 strcpy(airport_id, "");
91 // Parse an int out of a --foo-bar=n type option
92 static int parse_int(char *arg) {
95 // advance past the '='
96 while ( (arg[0] != '=') && (arg[0] != '\0') ) {
100 if ( arg[0] == '=' ) {
104 printf("parse_int(): arg = %s\n", arg);
108 printf("parse_int(): result = %d\n", result);
114 // Parse an int out of a --foo-bar=n type option
115 static double parse_double(char *arg) {
118 // advance past the '='
119 while ( (arg[0] != '=') && (arg[0] != '\0') ) {
123 if ( arg[0] == '=' ) {
127 printf("parse_double(): arg = %s\n", arg);
131 printf("parse_double(): result = %.4f\n", result);
137 // parse time string in the form of [+-]hh:mm:ss, returns the value in seconds
138 static double parse_time(char *time_str) {
140 double hours, minutes, seconds;
145 // printf("parse_time(): %s\n", time_str);
148 if ( strlen(time_str) ) {
149 if ( time_str[0] == '+' ) {
152 } else if ( time_str[0] == '-' ) {
157 // printf("sign = %d\n", sign);
160 if ( strlen(time_str) ) {
162 while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
163 num[i] = time_str[0];
167 if ( time_str[0] == ':' ) {
172 // printf("hours = %.2lf\n", hours);
174 result += hours * 3600.0;
178 if ( strlen(time_str) ) {
180 while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
181 num[i] = time_str[0];
185 if ( time_str[0] == ':' ) {
190 // printf("minutes = %.2lf\n", minutes);
192 result += minutes * 60.0;
196 if ( strlen(time_str) ) {
198 while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
199 num[i] = time_str[0];
205 // printf("seconds = %.2lf\n", seconds);
210 return(sign * result);
214 // parse time offset command line option
215 static int parse_time_offset(char *time_str) {
220 // printf("time offset = %s\n", time_str);
223 result = (int)rint(parse_time(time_str));
225 result = (int)parse_time(time_str);
228 printf("parse_time_offset(): %d\n", result);
234 // Parse --tile-diameter=n type option
236 #define FG_RADIUS_MIN 1
237 #define FG_RADIUS_MAX 4
239 static int parse_tile_radius(char *arg) {
242 radius = parse_int(arg);
244 if ( radius < FG_RADIUS_MIN ) { radius = FG_RADIUS_MIN; }
245 if ( radius > FG_RADIUS_MAX ) { radius = FG_RADIUS_MAX; }
247 printf("parse_tile_radius(): radius = %d\n", radius);
253 // Parse --fov=x.xx type option
254 static double parse_fov(char *arg) {
257 fov = parse_double(arg);
259 if ( fov < FG_FOV_MIN ) { fov = FG_FOV_MIN; }
260 if ( fov > FG_FOV_MAX ) { fov = FG_FOV_MAX; }
262 printf("parse_fov(): result = %.4f\n", fov);
268 // Parse a single option
269 int fgOPTIONS::parse_option( char *arg ) {
271 if ( (strcmp(arg, "--help") == 0) ||
272 (strcmp(arg, "-h") == 0) ) {
273 // help/usage request
274 return(FG_OPTIONS_HELP);
275 } else if ( strcmp(arg, "--disable-hud") == 0 ) {
277 } else if ( strcmp(arg, "--enable-hud") == 0 ) {
279 } else if ( strncmp(arg, "--airport-id=", 13) == 0 ) {
281 strncpy(airport_id, arg, 4);
282 } else if ( strncmp(arg, "--fg-root=", 10) == 0 ) {
284 strcpy(fg_root, arg);
285 } else if ( strcmp(arg, "--fog-disable") == 0 ) {
287 } else if ( strcmp(arg, "--fog-fastest") == 0 ) {
289 } else if ( strcmp(arg, "--fog-nicest") == 0 ) {
291 } else if ( strncmp(arg, "--fov=", 6) == 0 ) {
292 fov = parse_fov(arg);
293 } else if ( strcmp(arg, "--disable-fullscreen") == 0 ) {
295 } else if ( strcmp(arg, "--enable-fullscreen") == 0 ) {
297 } else if ( strcmp(arg, "--shading-flat") == 0 ) {
299 } else if ( strcmp(arg, "--shading-smooth") == 0 ) {
301 } else if ( strcmp(arg, "--disable-skyblend") == 0 ) {
303 } else if ( strcmp(arg, "--enable-skyblend") == 0 ) {
305 } else if ( strcmp(arg, "--disable-textures") == 0 ) {
307 } else if ( strcmp(arg, "--enable-textures") == 0 ) {
309 } else if ( strcmp(arg, "--disable-wireframe") == 0 ) {
311 } else if ( strcmp(arg, "--enable-wireframe") == 0 ) {
313 } else if ( strncmp(arg, "--tile-radius=", 14) == 0 ) {
314 tile_radius = parse_tile_radius(arg);
315 tile_diameter = tile_radius * 2 + 1;
316 } else if ( strncmp(arg, "--time-offset=", 14) == 0 ) {
317 time_offset = parse_time_offset(arg);
319 return(FG_OPTIONS_ERROR);
322 return(FG_OPTIONS_OK);
326 // Parse the command line options
327 int fgOPTIONS::parse_command_line( int argc, char **argv ) {
331 fgPrintf(FG_GENERAL, FG_INFO, "Processing command line arguments\n");
334 fgPrintf(FG_GENERAL, FG_INFO, "argv[%d] = %s\n", i, argv[i]);
336 result = parse_option(argv[i]);
337 if ( (result == FG_OPTIONS_HELP) || (result == FG_OPTIONS_ERROR) ) {
344 return(FG_OPTIONS_OK);
348 // Parse the command line options
349 int fgOPTIONS::parse_config_file( char *path ) {
350 char fgpath[256], line[256];
354 strcpy(fgpath, path);
355 strcat(fgpath, ".gz");
357 // first try "path.gz"
358 if ( (f = fgopen(fgpath, "rb")) == NULL ) {
360 if ( (f = fgopen(path, "rb")) == NULL ) {
361 return(FG_OPTIONS_ERROR);
365 fgPrintf(FG_GENERAL, FG_INFO, "Processing config file: %s\n", path);
367 while ( fggets(f, line, 250) != NULL ) {
368 // strip trailing newline if it exists
370 if ( line[len-1] == '\n' ) {
374 result = parse_option(line);
375 if ( result == FG_OPTIONS_ERROR ) {
376 fgPrintf( FG_GENERAL, FG_EXIT,
377 "Config file parse error: %s '%s'\n", path, line );
382 return(FG_OPTIONS_OK);
386 // Print usage message
387 void fgOPTIONS::usage ( void ) {
388 printf("Usage: fg [ options ... ]\n");
391 printf("General Options:\n");
392 printf("\t--help -h: print usage\n");
393 printf("\t--fg-root=path: specify the root path for all the data files\n");
396 printf("Features:\n");
397 printf("\t--disable-hud: disable heads up display\n");
398 printf("\t--enable-hud: enable heads up display\n");
401 printf("Initial Position:\n");
402 printf("\t--airport-id=ABCD: specify starting postion by airport id\n");
405 printf("Rendering Options:\n");
406 printf("\t--fog-disable: disable fog/haze\n");
407 printf("\t--fog-fastest: enable fastest fog/haze\n");
408 printf("\t--fog-nicest: enable nicest fog/haze\n");
409 printf("\t--fov=xx.x: specify initial field of view angle in degrees\n");
410 printf("\t--disable-fullscreen: disable fullscreen mode\n");
411 printf("\t--enable-fullscreen: enable fullscreen mode\n");
412 printf("\t--shading-flat: enable flat shading\n");
413 printf("\t--shading-smooth: enable smooth shading\n");
414 printf("\t--disable-skyblend: disable sky blending\n");
415 printf("\t--enable-skyblend: enable sky blending\n");
416 printf("\t--disable-textures: disable textures\n");
417 printf("\t--enable-textures: enable textures\n");
418 printf("\t--disable-wireframe: disable wireframe drawing mode\n");
419 printf("\t--enable-wireframe: enable wireframe drawing mode\n");
422 printf("Scenery Options:\n");
423 printf("\t--tile-radius=n: specify tile radius, must be 1 - 4\n");
426 printf("Time Options:\n");
427 printf("\t--time-offset=[+-]hh:mm:ss: offset local time by this amount\n");
432 fgOPTIONS::~fgOPTIONS( void ) {
437 // Revision 1.14 1998/07/04 00:52:26 curt
438 // Add my own version of gluLookAt() (which is nearly identical to the
439 // Mesa/glu version.) But, by calculating the Model View matrix our selves
440 // we can save this matrix without having to read it back in from the video
441 // card. This hopefully allows us to save a few cpu cycles when rendering
442 // out the fragments because we can just use glLoadMatrixd() with the
443 // precalculated matrix for each tile rather than doing a push(), translate(),
444 // pop() for every fragment.
446 // Panel status defaults to off for now until it gets a bit more developed.
448 // Extract OpenGL driver info on initialization.
450 // Revision 1.13 1998/06/27 16:54:34 curt
451 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
452 // Don't change the view port when displaying the panel.
454 // Revision 1.12 1998/06/17 21:35:13 curt
455 // Refined conditional audio support compilation.
456 // Moved texture parameter setup calls to ../Scenery/materials.cxx
457 // #include <string.h> before various STL includes.
458 // Make HUD default state be enabled.
460 // Revision 1.11 1998/06/13 00:40:33 curt
461 // Tweaked fog command line options.
463 // Revision 1.10 1998/05/16 13:08:36 curt
464 // C++ - ified views.[ch]xx
465 // Shuffled some additional view parameters into the fgVIEW class.
466 // Changed tile-radius to tile-diameter because it is a much better
468 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
469 // to transform world space to eye space for view frustum culling.
471 // Revision 1.9 1998/05/13 18:29:59 curt
472 // Added a keyboard binding to dynamically adjust field of view.
473 // Added a command line option to specify fov.
474 // Adjusted terrain color.
475 // Root path info moved to fgOPTIONS.
476 // Added ability to parse options out of a config file.
478 // Revision 1.8 1998/05/07 23:14:16 curt
479 // Added "D" key binding to set autopilot heading.
480 // Made frame rate calculation average out over last 10 frames.
481 // Borland C++ floating point exception workaround.
482 // Added a --tile-radius=n option.
484 // Revision 1.7 1998/05/06 03:16:25 curt
485 // Added an averaged global frame rate counter.
486 // Added an option to control tile radius.
488 // Revision 1.6 1998/05/03 00:47:32 curt
489 // Added an option to enable/disable full-screen mode.
491 // Revision 1.5 1998/04/30 12:34:19 curt
492 // Added command line rendering options:
493 // enable/disable fog/haze
494 // specify smooth/flat shading
495 // disable sky blending and just use a solid color
496 // enable wireframe drawing mode
498 // Revision 1.4 1998/04/28 01:20:22 curt
499 // Type-ified fgTIME and fgVIEW.
500 // Added a command line option to disable textures.
502 // Revision 1.3 1998/04/26 05:01:19 curt
503 // Added an rint() / HAVE_RINT check.
505 // Revision 1.2 1998/04/25 15:11:12 curt
506 // Added an command line option to set starting position based on airport ID.
508 // Revision 1.1 1998/04/24 00:49:21 curt
509 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
510 // Trying out some different option parsing code.
511 // Some code reorganization.