source/demo.cpp

   1 #include <msp/time/utils.h>
   2 #include "demo.h"
   3
   4 using namespace std;
   5 using namespace Msp;
   6
   7 Demo::Demo(Graphics::Window &window, Graphics::GLContext &gl_ctx, DataFile::Collection &r):
   8         resources(r),
   9         view(window, gl_ctx),
  10         music_source(0),
  11         streamer(0),
  12         music_io(0),
  13         music_decoder(0)
  14 {
  15         sequencer.signal_finished.connect(signal_finished);
  16 }
  17
  18 Demo::~Demo()
  19 {
  20         delete streamer;
  21         delete music_decoder;
  22         delete music_io;
  23         delete music_source;
  24 }
  25
  26 void Demo::set_fixed_framerate(float fps)
  27 {
  28         frame_interval = Time::sec/fps;
  29 }
  30
  31 void Demo::enable_music()
  32 {
  33         if(!music_source)
  34                 music_source = new AL::Source;
  35         if(!streamer)
  36                 streamer = new AL::Streamer(*music_source);
  37 }
  38
  39 void Demo::play_music(const string &fn)
  40 {
  41         if(!streamer)
  42                 return;
  43
  44         streamer->stop();
  45         delete music_decoder;
  46         delete music_io;
  47         music_io = resources.open_raw(fn);
  48         music_decoder = AL::SoundDecoder::open_io(*music_io);
  49         float beat = sequencer.get_current_beat();
  50         if(beat)
  51         {
  52                 float time = beat*60/sequencer.get_beats_per_minute();
  53                 unsigned bytes_per_sec = music_decoder->get_frequency()*get_unit_size(music_decoder->get_format());
  54                 music_decoder->seek(time*bytes_per_sec);
  55         }
  56         streamer->play(*music_decoder);
  57 }
  58
  59 void Demo::tick()
  60 {
  61         Time::TimeStamp t = Time::now();
  62         Time::TimeDelta dt = (last_tick ? frame_interval ? frame_interval : t-last_tick : Time::zero);
  63         last_tick = t;
  64
  65         if(frame_interval)
  66                 next_frame = t+frame_interval;
  67
  68         sequencer.tick(dt);
  69         if(streamer)
  70                 streamer->tick();
  71         view.render();
  72 }
  73
  74 void Demo::seek(const Time::TimeDelta &pos)
  75 {
  76         sequencer.seek(pos*sequencer.get_beats_per_minute()/Time::min);
  77 }