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1 // soundmanager.cxx -- Wraps the SimGear OpenAl sound manager class
2 //
3 // Copyright (C) 2001  Curtis L. Olson - http://www.flightgear.org/~curt
4 //
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License as
7 // published by the Free Software Foundation; either version 2 of the
8 // License, or (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful, but
11 // WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 // General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
18 //
19
20 #ifdef HAVE_CONFIG_H
21 #  include <config.h>
22 #endif
23
24 #include <simgear/sound/soundmgr_openal.hxx>
25
26 #include "soundmanager.hxx"
27 #include "Main/globals.hxx"
28 #include "Main/fg_props.hxx"
29
30 #include <vector>
31 #include <string>
32
33 #ifdef ENABLE_AUDIO_SUPPORT
34 /**
35  * Listener class that monitors the sim state.
36  */
37 class Listener : public SGPropertyChangeListener
38 {
39 public:
40     Listener(FGSoundManager *wrapper) : _wrapper(wrapper) {}
41     virtual void valueChanged (SGPropertyNode * node);
42
43 private:
44     FGSoundManager* _wrapper;
45 };
46
47 void Listener::valueChanged(SGPropertyNode * node)
48 {
49     _wrapper->activate(node->getBoolValue());
50 }
51
52 FGSoundManager::FGSoundManager()
53   : _is_initialized(false),
54     _enabled(false),
55     _listener(new Listener(this))
56 {
57 }
58
59 FGSoundManager::~FGSoundManager()
60 {
61 }
62
63 void FGSoundManager::init()
64 {
65     _sound_working = fgGetNode("/sim/sound/working");
66     _sound_enabled = fgGetNode("/sim/sound/enabled");
67     _volume        = fgGetNode("/sim/sound/volume");
68     _device_name   = fgGetNode("/sim/sound/device-name");
69
70     _currentView   = fgGetNode("sim/current-view");
71     _viewPosLon    = fgGetNode("sim/current-view/viewer-lon-deg");
72     _viewPosLat    = fgGetNode("sim/current-view/viewer-lat-deg");
73     _viewPosElev   = fgGetNode("sim/current-view/viewer-elev-ft");
74   
75     _velocityNorthFPS = fgGetNode("velocities/speed-north-fps", true);
76     _velocityEastFPS  = fgGetNode("velocities/speed-east-fps", true);
77     _velocityDownFPS  = fgGetNode("velocities/speed-down-fps", true);
78   
79     _viewXoffset      = _currentView->getNode("x-offset-m", true);
80     _viewYoffset      = _currentView->getNode("y-offset-m", true);
81     _viewZoffset      = _currentView->getNode("z-offset-m", true);
82
83     SGPropertyNode_ptr scenery_loaded = fgGetNode("sim/sceneryloaded", true);
84     scenery_loaded->addChangeListener(_listener.get());
85
86     reinit();
87 }
88
89 void FGSoundManager::shutdown()
90 {
91     SGPropertyNode_ptr scenery_loaded = fgGetNode("sim/sceneryloaded", true);
92     scenery_loaded->removeChangeListener(_listener.get());
93     
94     SGSoundMgr::shutdown();
95 }
96
97 void FGSoundManager::reinit()
98 {
99     _is_initialized = false;
100
101     if (_is_initialized && !_sound_working->getBoolValue())
102     {
103         // shutdown sound support
104         stop();
105         return;
106     }
107
108     if (!_sound_working->getBoolValue())
109     {
110         return;
111     }
112
113     update_device_list();
114
115     select_device(_device_name->getStringValue());
116     SGSoundMgr::reinit();
117     _is_initialized = true;
118
119     activate(fgGetBool("sim/sceneryloaded", true));
120 }
121
122 void FGSoundManager::activate(bool State)
123 {
124     if (_is_initialized)
125     {
126         if (State)
127         {
128             SGSoundMgr::activate();
129         }
130     }
131 }
132
133 void FGSoundManager::update_device_list()
134 {
135     std::vector <const char*>devices = get_available_devices();
136     for (unsigned int i=0; i<devices.size(); i++) {
137         SGPropertyNode *p = fgGetNode("/sim/sound/devices/device", i, true);
138         p->setStringValue(devices[i]);
139     }
140     devices.clear();
141 }
142
143 bool FGSoundManager::stationaryView() const
144 {
145   // this is an ugly hack to decide if the *viewer* is stationary,
146   // since we don't model the viewer velocity directly.
147   return (_viewXoffset->getDoubleValue() == 0.0) &&
148          (_viewYoffset->getDoubleValue() == 0.0) &&
149          (_viewZoffset->getDoubleValue() == 0.0);
150 }
151
152 // Update sound manager and propagate property values,
153 // since the sound manager doesn't read any properties itself.
154 // Actual sound update is triggered by the subsystem manager.
155 void FGSoundManager::update(double dt)
156 {
157     if (_is_initialized && _sound_working->getBoolValue())
158     {
159         bool enabled = _sound_enabled->getBoolValue();
160         if (enabled != _enabled)
161         {
162             if (enabled)
163                 resume();
164             else
165                 suspend();
166             _enabled = enabled;
167         }
168         if (enabled)
169         {
170             SGGeod viewPosGeod(SGGeod::fromDegFt(_viewPosLon->getDoubleValue(),
171                                                  _viewPosLat->getDoubleValue(),
172                                                  _viewPosElev->getDoubleValue()));
173             SGVec3d cartPos = SGVec3d::fromGeod(viewPosGeod);
174
175             set_position(cartPos, viewPosGeod);
176
177             SGQuatd viewOrientation;
178             for (int i=0; i<4; ++i) {
179               viewOrientation[i] = _currentView->getChild("raw-orientation", i, true)->getDoubleValue();
180             }
181
182             set_orientation( viewOrientation );
183
184             SGVec3d velocity(SGVec3d::zeros());
185             if (!stationaryView()) {
186               velocity = SGVec3d(_velocityNorthFPS->getDoubleValue(),
187                                  _velocityEastFPS->getDoubleValue(),
188                                  _velocityDownFPS->getDoubleValue() );
189             }
190
191             set_velocity( velocity );
192
193             set_volume(_volume->getFloatValue());
194             SGSoundMgr::update(dt);
195         }
196     }
197 }
198
199 #endif // ENABLE_AUDIO_SUPPORT