ac0f49a929
NasalSys.cxx more robust instead. The reason for the crash was that during
fgfs shutdown destroyed subsystems (GENERAL group) still need Nasal access
(for AI Model destruction listeners), but at that point globals->get_subsystem()
can't even deliver the "nasal" subsystem (INIT group). One way to solve that
problem would have been to replace globals->get_subsystem("nasal") by
globals->get_subsystem_mgr()->get_group(SGSubsystemMgr::INIT)->get_subsystem("nasal"),
but Andy decided to store a pointer to the active "nasal" subsysten in
NasalSys.cxx instead, as the "nasal" subsystem needs to be accessed in
every single Nasal extension function, and multiple "nasal" subsystems are
out of the question, anyway.
147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
// util.cxx - general-purpose utility functions.
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// Copyright (C) 2002 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#include <simgear/compiler.h>
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#include <math.h>
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#include <vector>
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SG_USING_STD(vector);
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#include <simgear/debug/logstream.hxx>
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#include "fg_io.hxx"
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#include "fg_props.hxx"
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#include "globals.hxx"
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#include "util.hxx"
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#ifdef OSG_LIBRARY_STATIC
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#include "osgDB/Registry"
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#endif
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void
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fgDefaultWeatherValue (const char * propname, double value)
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{
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unsigned int i;
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SGPropertyNode * branch = fgGetNode("/environment/config/boundary", true);
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vector<SGPropertyNode_ptr> entries = branch->getChildren("entry");
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for (i = 0; i < entries.size(); i++) {
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entries[i]->setDoubleValue(propname, value);
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}
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branch = fgGetNode("/environment/config/aloft", true);
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entries = branch->getChildren("entry");
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for (i = 0; i < entries.size(); i++) {
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entries[i]->setDoubleValue(propname, value);
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}
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}
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void
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fgSetupWind (double min_hdg, double max_hdg, double speed, double gust)
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{
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// Initialize to a reasonable state
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fgDefaultWeatherValue("wind-from-heading-deg", min_hdg);
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fgDefaultWeatherValue("wind-speed-kt", speed);
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SG_LOG(SG_GENERAL, SG_INFO, "WIND: " << min_hdg << '@' <<
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speed << " knots" << endl);
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// Now, add some variety to the layers
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min_hdg += 10;
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if (min_hdg > 360)
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min_hdg -= 360;
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speed *= 1.1;
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fgSetDouble("/environment/config/boundary/entry[1]/wind-from-heading-deg",
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min_hdg);
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fgSetDouble("/environment/config/boundary/entry[1]/wind-speed-kt",
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speed);
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min_hdg += 20;
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if (min_hdg > 360)
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min_hdg -= 360;
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speed *= 1.1;
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fgSetDouble("/environment/config/aloft/entry[0]/wind-from-heading-deg",
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min_hdg);
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fgSetDouble("/environment/config/aloft/entry[0]/wind-speed-kt",
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speed);
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min_hdg += 10;
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if (min_hdg > 360)
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min_hdg -= 360;
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speed *= 1.1;
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fgSetDouble("/environment/config/aloft/entry[1]/wind-from-heading-deg",
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min_hdg);
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fgSetDouble("/environment/config/aloft/entry[1]/wind-speed-kt",
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speed);
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min_hdg += 10;
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if (min_hdg > 360)
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min_hdg -= 360;
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speed *= 1.1;
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fgSetDouble("/environment/config/aloft/entry[2]/wind-from-heading-deg",
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min_hdg);
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fgSetDouble("/environment/config/aloft/entry[2]/wind-speed-kt",
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speed);
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}
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void
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fgExit (int status)
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{
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#ifdef OSG_LIBRARY_STATIC
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osgDB::Registry::instance( true);
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#endif
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SG_LOG(SG_GENERAL, SG_INFO, "Exiting FlightGear with status " << status);
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exit(status);
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}
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// Originally written by Alex Perry.
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double
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fgGetLowPass (double current, double target, double timeratio)
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{
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if ( timeratio < 0.0 ) {
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if ( timeratio < -1.0 ) {
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// time went backwards; kill the filter
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current = target;
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} else {
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// ignore mildly negative time
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}
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} else if ( timeratio < 0.2 ) {
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// Normal mode of operation; fast
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// approximation to exp(-timeratio)
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current = current * (1.0 - timeratio) + target * timeratio;
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} else if ( timeratio > 5.0 ) {
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// Huge time step; assume filter has settled
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current = target;
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} else {
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// Moderate time step; non linear response
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double keep = exp(-timeratio);
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current = current * keep + target * (1.0 - keep);
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}
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return current;
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}
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// end of util.cxx
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