src/object/ambient_sound.cpp

   1 // ambient_sound.cpp   basti_
   2 //
   3 //  SuperTux
   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
   7 //  as published by the Free Software Foundation; either version 2
   8 //  of the License, or (at your option) any later version.
   9 //
  10 //  This program is distributed in the hope that it will be useful,
  11 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 //  GNU 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., 59 Temple Place - Suite 330, Boston, MA
  18 //  02111-1307, USA.
  19 #include <config.h>
  20
  21 #include <math.h>
  22 #include <stdexcept>
  23 #include <iostream>
  24
  25 #include "ambient_sound.hpp"
  26 #include "object_factory.hpp"
  27 #include "lisp/lisp.hpp"
  28 #include "sector.hpp"
  29 #include "audio/sound_manager.hpp"
  30 #include "audio/sound_source.hpp"
  31
  32 AmbientSound::AmbientSound(const lisp::Lisp& lisp)
  33 {
  34   position.x=0;
  35   position.y=0;
  36
  37   dimension.x=0;
  38   dimension.y=0;
  39
  40   distance_factor=0;
  41   distance_bias=0;
  42   maximumvolume=1;
  43   sample="";
  44
  45   if (!(lisp.get("x", position.x)&&lisp.get("y", position.y))) {
  46     std::cerr << "No Position in ambient_sound"  << std::endl;
  47   }
  48
  49   lisp.get("width" , dimension.x);
  50   lisp.get("height", dimension.y);
  51
  52   lisp.get("distance_factor",distance_factor);
  53   lisp.get("distance_bias"  ,distance_bias  );
  54   lisp.get("sample"         ,sample         );
  55   lisp.get("volume"         ,maximumvolume  );
  56
  57   // set dimension to zero if smaller than 64, which is default size in flexlay
  58
  59   if ((dimension.x <= 64) || (dimension.y <= 64)) {
  60     dimension.x = 0;
  61     dimension.y = 0;
  62   }
  63
  64   // square all distances (saves us a sqrt later)
  65
  66   distance_bias*=distance_bias;
  67   distance_factor*=distance_factor;
  68
  69   // set default silence_distance
  70
  71   if (distance_factor == 0)
  72     silence_distance = 10e99;
  73   else
  74     silence_distance = 1/distance_factor;
  75
  76   lisp.get("silence_distance",silence_distance);
  77
  78   sound_source = 0; // not playing at the beginning
  79   latency=0;
  80 }
  81
  82 AmbientSound::AmbientSound(Vector pos, float factor, float bias, float vol, std::string file)
  83 {
  84   position.x=pos.x;
  85   position.y=pos.y;
  86
  87   dimension.x=0;
  88   dimension.y=0;
  89
  90   distance_factor=factor*factor;
  91   distance_bias=bias*bias;
  92   maximumvolume=vol;
  93   sample=file;
  94
  95   // set default silence_distance
  96
  97   if (distance_factor == 0)
  98     silence_distance = 10e99;
  99   else
 100     silence_distance = 1/distance_factor;
 101
 102   sound_source = 0; // not playing at the beginning
 103   latency=0;
 104 }
 105
 106 AmbientSound::~AmbientSound() {
 107   stop_playing();
 108 }
 109
 110 void
 111 AmbientSound::hit(Player& )
 112 {
 113 }
 114
 115 void
 116 AmbientSound::stop_playing() {
 117   delete sound_source;
 118   sound_source = 0;
 119 }
 120
 121 void
 122 AmbientSound::start_playing()
 123 {
 124   try {
 125     std::string filename = "sounds/";
 126     filename += sample;
 127     filename += ".wav";
 128     sound_source = sound_manager->create_sound_source(filename);
 129     if(!sound_source)
 130       throw std::runtime_error("file not found");
 131
 132     sound_source->set_gain(0);
 133     sound_source->set_looping(true);
 134     currentvolume=targetvolume=1e-20;
 135     sound_source->play();
 136   } catch(std::exception& e) {
 137     std::cerr << "Couldn't play '" << sample << "': " << e.what() << "\n";
 138     delete sound_source;
 139     sound_source = 0;
 140   }
 141 }
 142
 143 void
 144 AmbientSound::update(float deltat)
 145 {
 146   if (latency--<=0) {
 147
 148     float px,py;
 149     float rx,ry;
 150
 151     // Player position
 152
 153     px=Sector::current()->player->get_pos().x;
 154     py=Sector::current()->player->get_pos().y;
 155
 156     // Relate to which point in the area
 157
 158     rx=px<position.x?position.x:
 159       (px<position.x+dimension.x?px:position.x+dimension.x);
 160     ry=py<position.y?position.y:
 161       (py<position.y+dimension.y?py:position.y+dimension.y);
 162
 163     // calculate square of distance
 164
 165     float sqrdistance=(px-rx)*(px-rx)+(py-ry)*(py-ry);
 166
 167     sqrdistance-=distance_bias;
 168
 169     // inside the bias: full volume (distance 0)
 170
 171     if (sqrdistance<0)
 172       sqrdistance=0;
 173
 174     // calculate target volume - will never become 0
 175
 176     targetvolume=1/(1+sqrdistance*distance_factor);
 177
 178     float rise=targetvolume/currentvolume;
 179
 180     // rise/fall half life?
 181
 182     currentvolume*=pow(rise,deltat*10);
 183     currentvolume += 1e-6; // volume is at least 1e-6 (0 would never rise)
 184
 185     if (sound_source != 0) {
 186
 187       // set the volume
 188       sound_source->set_gain(currentvolume*maximumvolume);
 189
 190       if (sqrdistance>=silence_distance && currentvolume<1e-3)
 191         stop_playing();
 192       latency=0;
 193     } else {
 194       if (sqrdistance<silence_distance) {
 195         start_playing();
 196         latency=0;
 197       }
 198       else // set a reasonable latency
 199         latency=(int)(0.001/distance_factor);
 200       //(int)(10*((sqrdistance-silence_distance)/silence_distance));
 201     }
 202   }
 203
 204   // heuristically measured "good" latency maximum
 205
 206   //  if (latency>0.001/distance_factor)
 207   // latency=
 208 }
 209
 210 void
 211 AmbientSound::draw(DrawingContext &)
 212 {
 213 }
 214
 215 IMPLEMENT_FACTORY(AmbientSound, "ambient_sound");