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flightgear/Main/options.cxx
curt 2be63aa0fb Add my own version of gluLookAt() (which is nearly identical to the 
Mesa/glu version.)  But, by calculating the Model View matrix our selves
we can save this matrix without having to read it back in from the video
card.  This hopefully allows us to save a few cpu cycles when rendering
out the fragments because we can just use glLoadMatrixd() with the
precalculated matrix for each tile rather than doing a push(), translate(),
pop() for every fragment.

Panel status defaults to off for now until it gets a bit more developed.

Extract OpenGL driver info on initialization.
1998-07-04 00:52:22 +00:00

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//
// options.cxx -- class to handle command line options
//
// Written by Curtis Olson, started April 1998.
//
// Copyright (C) 1998 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
#include <math.h> // rint()
#include <stdio.h>
#include <stdlib.h> // atof(), atoi()
#include <string.h>
#include <Debug/fg_debug.h>
#include <Include/fg_constants.h>
#include <Include/fg_zlib.h>
#include "options.hxx"
// Defined the shared options class here
fgOPTIONS current_options;
// Constructor
fgOPTIONS::fgOPTIONS( void ) {
// set initial values/defaults
if ( getenv("FG_ROOT") != NULL ) {
// fg_root could be anywhere, so default to environmental
// variable $FG_ROOT if it is set.
strcpy(fg_root, getenv("FG_ROOT"));
} else {
// Otherwise, default to a random compiled in location if
// $FG_ROOT is not set. This can still be overridden from the
// command line or a config file.
#if defined(WIN32)
strcpy(fg_root, "\\FlightGear");
#else
strcpy(fg_root, "/usr/local/lib/FlightGear");
#endif
}
// default airport id
strcpy(airport_id, "");
// Features
hud_status = 1;
panel_status = 0;
// Rendering options
fog = 2; // nicest
fov = 65.0;
fullscreen = 0;
shading = 1;
skyblend = 1;
textures = 1;
wireframe = 0;
// Scenery options
tile_diameter = 7;
// Time options
time_offset = 0;
}
// Parse an int out of a --foo-bar=n type option
static int parse_int(char *arg) {
int result;
// advance past the '='
while ( (arg[0] != '=') && (arg[0] != '\0') ) {
arg++;
}
if ( arg[0] == '=' ) {
arg++;
}
printf("parse_int(): arg = %s\n", arg);
result = atoi(arg);
printf("parse_int(): result = %d\n", result);
return(result);
}
// Parse an int out of a --foo-bar=n type option
static double parse_double(char *arg) {
double result;
// advance past the '='
while ( (arg[0] != '=') && (arg[0] != '\0') ) {
arg++;
}
if ( arg[0] == '=' ) {
arg++;
}
printf("parse_double(): arg = %s\n", arg);
result = atof(arg);
printf("parse_double(): result = %.4f\n", result);
return(result);
}
// parse time string in the form of [+-]hh:mm:ss, returns the value in seconds
static double parse_time(char *time_str) {
char num[256];
double hours, minutes, seconds;
double result = 0.0;
int sign = 1;
int i;
// printf("parse_time(): %s\n", time_str);
// check for sign
if ( strlen(time_str) ) {
if ( time_str[0] == '+' ) {
sign = 1;
time_str++;
} else if ( time_str[0] == '-' ) {
sign = -1;
time_str++;
}
}
// printf("sign = %d\n", sign);
// get hours
if ( strlen(time_str) ) {
i = 0;
while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
num[i] = time_str[0];
time_str++;
i++;
}
if ( time_str[0] == ':' ) {
time_str++;
}
num[i] = '\0';
hours = atof(num);
// printf("hours = %.2lf\n", hours);
result += hours * 3600.0;
}
// get minutes
if ( strlen(time_str) ) {
i = 0;
while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
num[i] = time_str[0];
time_str++;
i++;
}
if ( time_str[0] == ':' ) {
time_str++;
}
num[i] = '\0';
minutes = atof(num);
// printf("minutes = %.2lf\n", minutes);
result += minutes * 60.0;
}
// get seconds
if ( strlen(time_str) ) {
i = 0;
while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
num[i] = time_str[0];
time_str++;
i++;
}
num[i] = '\0';
seconds = atof(num);
// printf("seconds = %.2lf\n", seconds);
result += seconds;
}
return(sign * result);
}
// parse time offset command line option
static int parse_time_offset(char *time_str) {
int result;
time_str += 14;
// printf("time offset = %s\n", time_str);
#ifdef HAVE_RINT
result = (int)rint(parse_time(time_str));
#else
result = (int)parse_time(time_str);
#endif
printf("parse_time_offset(): %d\n", result);
return( result );
}
// Parse --tile-diameter=n type option
#define FG_RADIUS_MIN 1
#define FG_RADIUS_MAX 4
static int parse_tile_radius(char *arg) {
int radius, tmp;
radius = parse_int(arg);
if ( radius < FG_RADIUS_MIN ) { radius = FG_RADIUS_MIN; }
if ( radius > FG_RADIUS_MAX ) { radius = FG_RADIUS_MAX; }
printf("parse_tile_radius(): radius = %d\n", radius);
return(radius);
}
// Parse --fov=x.xx type option
static double parse_fov(char *arg) {
double fov;
fov = parse_double(arg);
if ( fov < FG_FOV_MIN ) { fov = FG_FOV_MIN; }
if ( fov > FG_FOV_MAX ) { fov = FG_FOV_MAX; }
printf("parse_fov(): result = %.4f\n", fov);
return(fov);
}
// Parse a single option
int fgOPTIONS::parse_option( char *arg ) {
// General Options
if ( (strcmp(arg, "--help") == 0) ||
(strcmp(arg, "-h") == 0) ) {
// help/usage request
return(FG_OPTIONS_HELP);
} else if ( strcmp(arg, "--disable-hud") == 0 ) {
hud_status = 0;
} else if ( strcmp(arg, "--enable-hud") == 0 ) {
hud_status = 1;
} else if ( strncmp(arg, "--airport-id=", 13) == 0 ) {
arg += 13;
strncpy(airport_id, arg, 4);
} else if ( strncmp(arg, "--fg-root=", 10) == 0 ) {
arg += 10;
strcpy(fg_root, arg);
} else if ( strcmp(arg, "--fog-disable") == 0 ) {
fog = 0;
} else if ( strcmp(arg, "--fog-fastest") == 0 ) {
fog = 1;
} else if ( strcmp(arg, "--fog-nicest") == 0 ) {
fog = 2;
} else if ( strncmp(arg, "--fov=", 6) == 0 ) {
fov = parse_fov(arg);
} else if ( strcmp(arg, "--disable-fullscreen") == 0 ) {
fullscreen = 0;
} else if ( strcmp(arg, "--enable-fullscreen") == 0 ) {
fullscreen = 1;
} else if ( strcmp(arg, "--shading-flat") == 0 ) {
shading = 0;
} else if ( strcmp(arg, "--shading-smooth") == 0 ) {
shading = 1;
} else if ( strcmp(arg, "--disable-skyblend") == 0 ) {
skyblend = 0;
} else if ( strcmp(arg, "--enable-skyblend") == 0 ) {
skyblend = 1;
} else if ( strcmp(arg, "--disable-textures") == 0 ) {
textures = 0;
} else if ( strcmp(arg, "--enable-textures") == 0 ) {
textures = 1;
} else if ( strcmp(arg, "--disable-wireframe") == 0 ) {
wireframe = 0;
} else if ( strcmp(arg, "--enable-wireframe") == 0 ) {
wireframe = 1;
} else if ( strncmp(arg, "--tile-radius=", 14) == 0 ) {
tile_radius = parse_tile_radius(arg);
tile_diameter = tile_radius * 2 + 1;
} else if ( strncmp(arg, "--time-offset=", 14) == 0 ) {
time_offset = parse_time_offset(arg);
} else {
return(FG_OPTIONS_ERROR);
}
return(FG_OPTIONS_OK);
}
// Parse the command line options
int fgOPTIONS::parse_command_line( int argc, char **argv ) {
int i = 1;
int result;
fgPrintf(FG_GENERAL, FG_INFO, "Processing command line arguments\n");
while ( i < argc ) {
fgPrintf(FG_GENERAL, FG_INFO, "argv[%d] = %s\n", i, argv[i]);
result = parse_option(argv[i]);
if ( (result == FG_OPTIONS_HELP) || (result == FG_OPTIONS_ERROR) ) {
return(result);
}
i++;
}
return(FG_OPTIONS_OK);
}
// Parse the command line options
int fgOPTIONS::parse_config_file( char *path ) {
char fgpath[256], line[256];
fgFile f;
int len, result;
strcpy(fgpath, path);
strcat(fgpath, ".gz");
// first try "path.gz"
if ( (f = fgopen(fgpath, "rb")) == NULL ) {
// next try "path"
if ( (f = fgopen(path, "rb")) == NULL ) {
return(FG_OPTIONS_ERROR);
}
}
fgPrintf(FG_GENERAL, FG_INFO, "Processing config file: %s\n", path);
while ( fggets(f, line, 250) != NULL ) {
// strip trailing newline if it exists
len = strlen(line);
if ( line[len-1] == '\n' ) {
line[len-1] = '\0';
}
result = parse_option(line);
if ( result == FG_OPTIONS_ERROR ) {
fgPrintf( FG_GENERAL, FG_EXIT,
"Config file parse error: %s '%s'\n", path, line );
}
}
fgclose(f);
return(FG_OPTIONS_OK);
}
// Print usage message
void fgOPTIONS::usage ( void ) {
printf("Usage: fg [ options ... ]\n");
printf("\n");
printf("General Options:\n");
printf("\t--help -h: print usage\n");
printf("\t--fg-root=path: specify the root path for all the data files\n");
printf("\n");
printf("Features:\n");
printf("\t--disable-hud: disable heads up display\n");
printf("\t--enable-hud: enable heads up display\n");
printf("\n");
printf("Initial Position:\n");
printf("\t--airport-id=ABCD: specify starting postion by airport id\n");
printf("\n");
printf("Rendering Options:\n");
printf("\t--fog-disable: disable fog/haze\n");
printf("\t--fog-fastest: enable fastest fog/haze\n");
printf("\t--fog-nicest: enable nicest fog/haze\n");
printf("\t--fov=xx.x: specify initial field of view angle in degrees\n");
printf("\t--disable-fullscreen: disable fullscreen mode\n");
printf("\t--enable-fullscreen: enable fullscreen mode\n");
printf("\t--shading-flat: enable flat shading\n");
printf("\t--shading-smooth: enable smooth shading\n");
printf("\t--disable-skyblend: disable sky blending\n");
printf("\t--enable-skyblend: enable sky blending\n");
printf("\t--disable-textures: disable textures\n");
printf("\t--enable-textures: enable textures\n");
printf("\t--disable-wireframe: disable wireframe drawing mode\n");
printf("\t--enable-wireframe: enable wireframe drawing mode\n");
printf("\n");
printf("Scenery Options:\n");
printf("\t--tile-radius=n: specify tile radius, must be 1 - 4\n");
printf("\n");
printf("Time Options:\n");
printf("\t--time-offset=[+-]hh:mm:ss: offset local time by this amount\n");
}
// Destructor
fgOPTIONS::~fgOPTIONS( void ) {
}
// $Log$
// Revision 1.14 1998/07/04 00:52:26 curt
// Add my own version of gluLookAt() (which is nearly identical to the
// Mesa/glu version.) But, by calculating the Model View matrix our selves
// we can save this matrix without having to read it back in from the video
// card. This hopefully allows us to save a few cpu cycles when rendering
// out the fragments because we can just use glLoadMatrixd() with the
// precalculated matrix for each tile rather than doing a push(), translate(),
// pop() for every fragment.
//
// Panel status defaults to off for now until it gets a bit more developed.
//
// Extract OpenGL driver info on initialization.
//
// Revision 1.13 1998/06/27 16:54:34 curt
// Replaced "extern displayInstruments" with a entry in fgOPTIONS.
// Don't change the view port when displaying the panel.
//
// Revision 1.12 1998/06/17 21:35:13 curt
// Refined conditional audio support compilation.
// Moved texture parameter setup calls to ../Scenery/materials.cxx
// #include <string.h> before various STL includes.
// Make HUD default state be enabled.
//
// Revision 1.11 1998/06/13 00:40:33 curt
// Tweaked fog command line options.
//
// Revision 1.10 1998/05/16 13:08:36 curt
// C++ - ified views.[ch]xx
// Shuffled some additional view parameters into the fgVIEW class.
// Changed tile-radius to tile-diameter because it is a much better
// name.
// Added a WORLD_TO_EYE transformation to views.cxx. This allows us
// to transform world space to eye space for view frustum culling.
//
// Revision 1.9 1998/05/13 18:29:59 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 1.8 1998/05/07 23:14:16 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 1.7 1998/05/06 03:16:25 curt
// Added an averaged global frame rate counter.
// Added an option to control tile radius.
//
// Revision 1.6 1998/05/03 00:47:32 curt
// Added an option to enable/disable full-screen mode.
//
// Revision 1.5 1998/04/30 12:34:19 curt
// Added command line rendering options:
// enable/disable fog/haze
// specify smooth/flat shading
// disable sky blending and just use a solid color
// enable wireframe drawing mode
//
// Revision 1.4 1998/04/28 01:20:22 curt
// Type-ified fgTIME and fgVIEW.
// Added a command line option to disable textures.
//
// Revision 1.3 1998/04/26 05:01:19 curt
// Added an rint() / HAVE_RINT check.
//
// Revision 1.2 1998/04/25 15:11:12 curt
// Added an command line option to set starting position based on airport ID.
//
// Revision 1.1 1998/04/24 00:49:21 curt
// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
// Trying out some different option parsing code.
// Some code reorganization.
//
//
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