4 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
6 // This program is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU General Public License
8 // as published by the Free Software Foundation; either version 2
9 // of the License, or (at your option) any later version.
11 // This program is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this program; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 #include "ambient_sound.hpp"
27 #include "object_factory.hpp"
28 #include "lisp/lisp.hpp"
30 #include "audio/sound_manager.hpp"
31 #include "audio/sound_source.hpp"
34 AmbientSound::AmbientSound(const lisp::Lisp& lisp)
47 if (!(lisp.get("x", position.x)&&lisp.get("y", position.y))) {
48 log_warning << "No Position in ambient_sound" << std::endl;
51 lisp.get("width" , dimension.x);
52 lisp.get("height", dimension.y);
54 lisp.get("distance_factor",distance_factor);
55 lisp.get("distance_bias" ,distance_bias );
56 lisp.get("sample" ,sample );
57 lisp.get("volume" ,maximumvolume );
59 // set dimension to zero if smaller than 64, which is default size in flexlay
61 if ((dimension.x <= 64) || (dimension.y <= 64)) {
66 // square all distances (saves us a sqrt later)
68 distance_bias*=distance_bias;
69 distance_factor*=distance_factor;
71 // set default silence_distance
73 if (distance_factor == 0)
74 silence_distance = 10e99;
76 silence_distance = 1/distance_factor;
78 lisp.get("silence_distance",silence_distance);
80 sound_source = 0; // not playing at the beginning
84 AmbientSound::AmbientSound(Vector pos, float factor, float bias, float vol, std::string file)
92 distance_factor=factor*factor;
93 distance_bias=bias*bias;
97 // set default silence_distance
99 if (distance_factor == 0)
100 silence_distance = 10e99;
102 silence_distance = 1/distance_factor;
104 sound_source = 0; // not playing at the beginning
108 AmbientSound::~AmbientSound() {
113 AmbientSound::hit(Player& )
118 AmbientSound::stop_playing() {
124 AmbientSound::start_playing()
127 sound_source = sound_manager->create_sound_source(sample);
129 throw std::runtime_error("file not found");
131 sound_source->set_gain(0);
132 sound_source->set_looping(true);
133 currentvolume=targetvolume=1e-20;
134 sound_source->play();
135 } catch(std::exception& e) {
136 log_warning << "Couldn't play '" << sample << "': " << e.what() << "" << std::endl;
143 AmbientSound::update(float deltat)
152 px=Sector::current()->player->get_pos().x;
153 py=Sector::current()->player->get_pos().y;
155 // Relate to which point in the area
157 rx=px<position.x?position.x:
158 (px<position.x+dimension.x?px:position.x+dimension.x);
159 ry=py<position.y?position.y:
160 (py<position.y+dimension.y?py:position.y+dimension.y);
162 // calculate square of distance
164 float sqrdistance=(px-rx)*(px-rx)+(py-ry)*(py-ry);
166 sqrdistance-=distance_bias;
168 // inside the bias: full volume (distance 0)
173 // calculate target volume - will never become 0
175 targetvolume=1/(1+sqrdistance*distance_factor);
177 float rise=targetvolume/currentvolume;
179 // rise/fall half life?
181 currentvolume*=pow(rise,deltat*10);
182 currentvolume += 1e-6; // volume is at least 1e-6 (0 would never rise)
184 if (sound_source != 0) {
187 sound_source->set_gain(currentvolume*maximumvolume);
189 if (sqrdistance>=silence_distance && currentvolume<1e-3)
193 if (sqrdistance<silence_distance) {
197 else // set a reasonable latency
198 latency=(int)(0.001/distance_factor);
199 //(int)(10*((sqrdistance-silence_distance)/silence_distance));
203 // heuristically measured "good" latency maximum
205 // if (latency>0.001/distance_factor)
210 AmbientSound::draw(DrawingContext &)
214 IMPLEMENT_FACTORY(AmbientSound, "ambient_sound");