]> git.mxchange.org Git - flightgear.git/blob - src/Network/native_ctrls.cxx
Moved some of the low level scene graph construction code over to simgear.
[flightgear.git] / src / Network / native_ctrls.cxx
1 // native_ctrls.cxx -- FGFS "Native" controls I/O class
2 //
3 // Written by Curtis Olson, started July 2001.
4 //
5 // Copyright (C) 2001  Curtis L. Olson - curt@flightgear.org
6 //
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
11 //
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 // General Public License for more details.
16 //
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 //
21 // $Id$
22
23
24 #ifdef HAVE_CONFIG_H
25 #  include <config.h>
26 #endif
27
28 #include <simgear/debug/logstream.hxx>
29 #include <simgear/io/iochannel.hxx>
30 #include <simgear/io/lowlevel.hxx> // endian tests
31
32 #include <FDM/flight.hxx>
33 #include <Main/fg_props.hxx>
34 #include <Scenery/scenery.hxx>  // ground elevation
35
36 #include "native_ctrls.hxx"
37
38 // FreeBSD works better with this included last ... (?)
39 #if defined(WIN32) && !defined(__CYGWIN__)
40 #  include <windows.h>
41 #else
42 #  include <netinet/in.h>       // htonl() ntohl()
43 #endif
44
45
46 FGNativeCtrls::FGNativeCtrls() {
47 }
48
49 FGNativeCtrls::~FGNativeCtrls() {
50 }
51
52
53 // open hailing frequencies
54 bool FGNativeCtrls::open() {
55     if ( is_enabled() ) {
56         SG_LOG( SG_IO, SG_ALERT, "This shouldn't happen, but the channel " 
57                 << "is already in use, ignoring" );
58         return false;
59     }
60
61     SGIOChannel *io = get_io_channel();
62
63     if ( ! io->open( get_direction() ) ) {
64         SG_LOG( SG_IO, SG_ALERT, "Error opening channel communication layer." );
65         return false;
66     }
67
68     set_enabled( true );
69
70     return true;
71 }
72
73
74 // The function htond is defined this way due to the way some
75 // processors and OSes treat floating point values.  Some will raise
76 // an exception whenever a "bad" floating point value is loaded into a
77 // floating point register.  Solaris is notorious for this, but then
78 // so is LynxOS on the PowerPC.  By translating the data in place,
79 // there is no need to load a FP register with the "corruped" floating
80 // point value.  By doing the BIG_ENDIAN test, I can optimize the
81 // routine for big-endian processors so it can be as efficient as
82 // possible
83 static void htond (double &x)   
84 {
85     if ( sgIsLittleEndian() ) {
86         int    *Double_Overlay;
87         int     Holding_Buffer;
88     
89         Double_Overlay = (int *) &x;
90         Holding_Buffer = Double_Overlay [0];
91     
92         Double_Overlay [0] = htonl (Double_Overlay [1]);
93         Double_Overlay [1] = htonl (Holding_Buffer);
94     } else {
95         return;
96     }
97 }
98
99
100 // Populate the FGNetCtrls structure from the property tree.
101 void FGProps2NetCtrls( FGNetCtrls *net, bool net_byte_order ) {
102     int i;
103     SGPropertyNode * node;
104     SGPropertyNode * tempnode;
105
106     // fill in values
107     node  = fgGetNode("/controls/flight", true);
108     net->version = FG_NET_CTRLS_VERSION;
109     net->aileron = node->getDoubleValue( "aileron" );
110     net->elevator = node->getDoubleValue( "elevator" );
111     net->elevator_trim = node->getDoubleValue( "elevator-trim" );
112     net->rudder = node->getDoubleValue( "rudder" );
113     net->flaps = node->getDoubleValue( "flaps" );
114     node = fgGetNode("/controls", true); 
115     net->flaps_power
116             = node->getDoubleValue( "/systems/electrical/outputs/flaps",
117                                     1.0 ) >= 1.0;
118     net->num_engines = FGNetCtrls::FG_MAX_ENGINES;
119     for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
120         node = fgGetNode("/controls/engines/engine", i );
121         net->throttle[i] = node->getDoubleValue( "throttle", 0.0 );
122         net->mixture[i] = node->getDoubleValue( "mixture", 0.0 );
123         net->prop_advance[i] = node->getDoubleValue( "propeller-pitch", 0.0 );
124         net->magnetos[i] = node->getIntValue( "magnetos", 0 );
125         if ( i == 0 ) {
126           // cout << "Magnetos -> " << node->getIntValue( "magnetos", 0 );
127         }
128         if ( i == 0 ) {
129           // cout << "Starter -> " << node->getIntValue( "starter", false )
130           //      << endl;
131         }
132         node = fgGetNode("/controls", true);
133         net->fuel_pump_power[i]
134             = node->getDoubleValue( "/systems/electrical/outputs/fuel-pump",
135                                     1.0 ) >= 1.0;
136
137         net->starter_power[i]
138             = node->getDoubleValue( "/systems/electrical/outputs/starter",
139                                     1.0 ) >= 1.0;
140     }
141     net->num_tanks = FGNetCtrls::FG_MAX_TANKS;
142     for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
143         node = fgGetNode("/controls/fuel/tank", i);
144         if ( node->getChild("fuel-selector") != 0 ) {
145             net->fuel_selector[i]
146                 = node->getChild("fuel-selector")->getBoolValue();
147         } else {
148             net->fuel_selector[i] = false;
149         }
150     }
151     net->num_wheels = FGNetCtrls::FG_MAX_WHEELS;
152     tempnode = fgGetNode("/controls/gear", true);
153     for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
154         node = fgGetNode("/controls/gear/wheel", i);
155         if ( node->getChild("brake") != 0 ) {
156             if ( tempnode->getChild("parking-brake")->getDoubleValue() > 0.0 ) {
157                 net->brake[i] = 1.0;
158            } else {
159                 net->brake[i]
160                     = node->getChild("brake")->getDoubleValue();
161             }
162         } else {
163             net->brake[i] = 0.0;
164         }
165     }
166
167     node = fgGetNode("/controls/switches", true);
168     net->master_bat = node->getChild("master-bat")->getBoolValue();
169     net->master_alt = node->getChild("master-alt")->getBoolValue();
170     net->master_avionics = node->getChild("master-avionics")->getBoolValue();
171
172     net->wind_speed_kt = fgGetDouble("/environment/wind-speed-kt");
173     net->wind_dir_deg = fgGetDouble("/environment/wind-from-heading-deg");
174
175     // cur_fdm_state->get_ground_elev_ft() is what we want ... this
176     // reports the altitude of the aircraft.
177     // "/environment/ground-elevation-m" reports the ground elevation
178     // of the current view point which could change substantially if
179     // the user is switching views.
180     net->hground = cur_fdm_state->get_ground_elev_ft() * SG_FEET_TO_METER;
181     net->magvar = fgGetDouble("/environment/magnetic-variation-deg");
182     net->speedup = fgGetInt("/sim/speed-up");
183     net->freeze = 0;
184     if ( fgGetBool("/sim/freeze/master") ) {
185         net->freeze |= 0x01;
186     }
187     if ( fgGetBool("/sim/freeze/position") ) {
188         net->freeze |= 0x02;
189     }
190     if ( fgGetBool("/sim/freeze/fuel") ) {
191         net->freeze |= 0x04;
192     }
193
194     if ( net_byte_order ) {
195         // convert to network byte order
196         net->version = htonl(net->version);
197         htond(net->aileron);
198         htond(net->elevator);
199         htond(net->elevator_trim);
200         htond(net->rudder);
201         htond(net->flaps);
202         net->flaps_power = htonl(net->flaps_power);
203         for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
204             htond(net->throttle[i]);
205             htond(net->mixture[i]);
206             net->fuel_pump_power[i] = htonl(net->fuel_pump_power[i]);
207             htond(net->prop_advance[i]);
208             net->magnetos[i] = htonl(net->magnetos[i]);
209             net->starter_power[i] = htonl(net->starter_power[i]);
210         }
211         net->num_engines = htonl(net->num_engines);
212         for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
213             net->fuel_selector[i] = htonl(net->fuel_selector[i]);
214         }
215         net->num_tanks = htonl(net->num_tanks);
216         for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
217             htond(net->brake[i]);
218         }
219         net->num_wheels = htonl(net->num_wheels);
220         net->gear_handle = htonl(net->gear_handle);
221         net->master_bat = htonl(net->master_bat);
222         net->master_alt = htonl(net->master_alt);
223         net->master_avionics = htonl(net->master_avionics);
224         htond(net->wind_speed_kt);
225         htond(net->wind_dir_deg);
226         htond(net->hground);
227         htond(net->magvar);
228         net->speedup = htonl(net->speedup);
229         net->freeze = htonl(net->freeze);
230     }
231 }
232
233
234 // Update the property tree from the FGNetCtrls structure.
235 void FGNetCtrls2Props( FGNetCtrls *net, bool net_byte_order ) {
236     int i;
237
238     SGPropertyNode * node;
239
240     if ( net_byte_order ) {
241         // convert from network byte order
242         net->version = htonl(net->version);
243         htond(net->aileron);
244         htond(net->elevator);
245         htond(net->elevator_trim);
246         htond(net->rudder);
247         htond(net->flaps);
248         net->flaps_power = htonl(net->flaps_power);
249         net->num_engines = htonl(net->num_engines);
250         for ( i = 0; i < net->num_engines; ++i ) {
251             net->magnetos[i] = htonl(net->magnetos[i]);
252             net->starter_power[i] = htonl(net->starter_power[i]);
253             htond(net->throttle[i]);
254             htond(net->mixture[i]);
255             net->fuel_pump_power[i] = htonl(net->fuel_pump_power[i]);
256             htond(net->prop_advance[i]);
257         }
258         net->num_tanks = htonl(net->num_tanks);
259         for ( i = 0; i < net->num_tanks; ++i ) {
260             net->fuel_selector[i] = htonl(net->fuel_selector[i]);
261         }
262         net->num_wheels = htonl(net->num_wheels);
263         for ( i = 0; i < net->num_wheels; ++i ) {
264             htond(net->brake[i]);
265         }
266         net->gear_handle = htonl(net->gear_handle);
267         net->master_bat = htonl(net->master_bat);
268         net->master_alt = htonl(net->master_alt);
269         net->master_avionics = htonl(net->master_avionics);
270         htond(net->wind_speed_kt);
271         htond(net->wind_dir_deg);
272         htond(net->hground);
273         htond(net->magvar);
274         net->speedup = htonl(net->speedup);
275         net->freeze = htonl(net->freeze);
276     }
277
278     if ( net->version != FG_NET_CTRLS_VERSION ) {
279         SG_LOG( SG_IO, SG_ALERT,
280                 "Version mismatch with raw controls packet format." );
281         SG_LOG( SG_IO, SG_ALERT,
282                 "FlightGear needs version = " << FG_NET_CTRLS_VERSION
283                 << " but is receiving version = "  << net->version );
284     }
285     node = fgGetNode("/controls/flight", true);
286     node->setDoubleValue( "aileron", net->aileron );
287     node->setDoubleValue( "elevator", net->elevator );
288     node->setDoubleValue( "elevator-trim", net->elevator_trim );
289     node->setDoubleValue( "rudder", net->rudder );
290     node->setDoubleValue( "flaps", net->flaps );
291
292     fgSetBool( "/systems/electrical/outputs/flaps", net->flaps_power );
293
294     for ( i = 0; i < FGNetCtrls::FG_MAX_ENGINES; ++i ) {
295         node = fgGetNode("/controls/engines/engine", i);
296         node->getChild( "throttle" )->setDoubleValue( net->throttle[i] );
297         node->getChild( "mixture" )->setDoubleValue( net->mixture[i] );
298         node->getChild( "propeller-pitch" )
299             ->setDoubleValue( net->prop_advance[i] );
300         node->getChild( "magnetos" )->setDoubleValue( net->magnetos[i] );
301     }
302
303     fgSetBool( "/systems/electrical/outputs/fuel-pump",
304                net->fuel_pump_power[0] );
305     fgSetBool( "/systems/electrical/outputs/starter",
306                net->starter_power[0] );
307
308     for ( i = 0; i < FGNetCtrls::FG_MAX_TANKS; ++i ) {
309         node = fgGetNode( "/controls/fuel/tank", i );
310         node->getChild( "fuel-selector" )
311             ->setBoolValue( net->fuel_selector[i] );
312     }
313     for ( i = 0; i < FGNetCtrls::FG_MAX_WHEELS; ++i ) {
314         node = fgGetNode( "/controls/gear/wheel", i );
315         node->getChild( "brake" )->setDoubleValue( net->brake[i] );
316     }
317
318     node = fgGetNode( "/controls/gear", true );
319     node->setBoolValue( "gear-down", net->gear_handle );
320
321     node = fgGetNode( "/controls/switches", true );
322     node->setBoolValue( "master-bat", net->master_bat );
323     node->setBoolValue( "master-alt", net->master_alt );
324     node->setBoolValue( "master-avionics", net->master_avionics );
325     
326     node = fgGetNode( "/environment", true );
327     node->setBoolValue( "wind-speed-kt", net->wind_speed_kt );
328     node->setBoolValue( "wind-from-heading-deg", net->wind_dir_deg );
329     node->setBoolValue( "magnetic-variation-deg", net->magvar );
330
331     // ground elevation ???
332
333     fgSetInt( "/sim/speed-up", net->speedup );
334
335     node = fgGetNode( "/sim/freeze", true );
336     node->setBoolValue( "master", net->freeze & 0x01 );
337     node->setBoolValue( "position", net->freeze & 0x02 );
338     node->setBoolValue( "fuel", net->freeze & 0x04 );
339 }
340
341
342 // process work for this port
343 bool FGNativeCtrls::process() {
344     SGIOChannel *io = get_io_channel();
345     int length = sizeof(FGNetCtrls);
346
347     if ( get_direction() == SG_IO_OUT ) {
348         // cout << "size of cur_fdm_state = " << length << endl;
349
350         FGProps2NetCtrls( &net_ctrls );
351
352         if ( ! io->write( (char *)(& net_ctrls), length ) ) {
353             SG_LOG( SG_IO, SG_ALERT, "Error writing data." );
354             return false;
355         }
356     } else if ( get_direction() == SG_IO_IN ) {
357         if ( io->get_type() == sgFileType ) {
358             if ( io->read( (char *)(& net_ctrls), length ) == length ) {
359                 SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
360                 FGNetCtrls2Props( &net_ctrls );
361             }
362         } else {
363             while ( io->read( (char *)(& net_ctrls), length ) == length ) {
364                 SG_LOG( SG_IO, SG_DEBUG, "Success reading data." );
365                 FGNetCtrls2Props( &net_ctrls );
366             }
367         }
368     }
369
370     return true;
371 }
372
373
374 // close the channel
375 bool FGNativeCtrls::close() {
376     SGIOChannel *io = get_io_channel();
377
378     set_enabled( false );
379
380     if ( ! io->close() ) {
381         return false;
382     }
383
384     return true;
385 }