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
  23 #include "ambient_sound.h"
  24 #include "object_factory.h"
  25 #include "lisp/lisp.h"
  26 #include "sector.h"
  27
  28 AmbientSound::AmbientSound(const lisp::Lisp& lisp)
  29 {
  30
  31   position.x=0;
  32   position.y=0;
  33   distance_factor=0;
  34   distance_bias=0;
  35   maximumvolume=1;
  36   sample="";
  37
  38   if (!(lisp.get("x", position.x)&&lisp.get("y", position.y))) {
  39     std::cerr << "No Position in ambient_sound"  << std::endl;
  40   }
  41   lisp.get("distance_factor",distance_factor);
  42   lisp.get("distance_bias"  ,distance_bias  );
  43   lisp.get("sample"         ,sample         );
  44   lisp.get("volume"         ,maximumvolume  );
  45
  46   distance_bias*=distance_bias;
  47   distance_factor*=distance_factor;
  48
  49   if (distance_factor == 0)
  50     silence_distance = 10e99;
  51   else
  52     silence_distance = 1/distance_factor;
  53
  54   lisp.get("silence_distance",silence_distance);
  55
  56   playing=-1; // not playing at the beginning
  57   latency=0;
  58
  59 }
  60
  61 AmbientSound::~AmbientSound() {
  62   stop_playing();
  63 }
  64
  65 void
  66 AmbientSound::hit(Player& )
  67 {
  68 }
  69
  70 void
  71 AmbientSound::stop_playing() {
  72   if (playing>=0) {
  73     Mix_HaltChannel(playing);
  74     playing=-1;
  75   }
  76 }
  77
  78 void
  79 AmbientSound::start_playing()
  80 {
  81   playing=sound_manager->play_sound(sample,-1);
  82   Mix_Volume(playing,0);
  83   currentvolume=targetvolume=1e-20;
  84 }
  85
  86 void
  87 AmbientSound::update(float deltat)
  88 {
  89   if (latency--<=0) {
  90
  91     float dx=Sector::current()->player->get_pos().x-position.x;
  92     float dy=Sector::current()->player->get_pos().y-position.y;
  93     float sqrdistance=dx*dx+dy*dy;
  94
  95     sqrdistance-=distance_bias;
  96
  97     if (sqrdistance<0)
  98       sqrdistance=0;
  99
 100     targetvolume=1/(1+sqrdistance*distance_factor);
 101     float rise=targetvolume/currentvolume;
 102     currentvolume*=pow(rise,deltat*10);
 103     currentvolume += 1e-30;
 104
 105     if (playing>=0) {
 106       Mix_Volume(playing,(int)(currentvolume*maximumvolume*MIX_MAX_VOLUME));
 107       if (sqrdistance>=silence_distance && currentvolume<0.05)
 108         stop_playing();
 109       latency=0;
 110     } else {
 111       if (sqrdistance<silence_distance) {
 112         start_playing();
 113         latency=0;
 114       }
 115       else
 116         latency=(int)(10*((sqrdistance-silence_distance)/silence_distance));
 117     }
 118
 119   }
 120   if (latency>0.001/distance_factor)
 121     latency=(int)(0.001/distance_factor);
 122 }
 123
 124 void
 125 AmbientSound::draw(DrawingContext &)
 126 {
 127 }
 128
 129 IMPLEMENT_FACTORY(AmbientSound, "ambient_sound");