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         things["window"] = static_cast<GL::View *>(&view);
  16
  17         sequencer.signal_finished.connect(signal_finished);
  18 }
  19
  20 Demo::~Demo()
  21 {
  22         delete streamer;
  23         delete music_decoder;
  24         delete music_io;
  25         delete music_source;
  26 }
  27
  28 void Demo::set_fixed_framerate(float fps)
  29 {
  30         frame_interval = Time::sec/fps;
  31 }
  32
  33 void Demo::enable_music()
  34 {
  35         if(!music_source)
  36                 music_source = new AL::Source;
  37         if(!streamer)
  38                 streamer = new AL::Streamer(*music_source);
  39 }
  40
  41 void Demo::play_music(const string &fn)
  42 {
  43         if(!streamer)
  44                 return;
  45
  46         streamer->stop();
  47         delete music_decoder;
  48         delete music_io;
  49         music_io = resources.open_raw(fn);
  50         music_decoder = AL::SoundDecoder::open_io(*music_io);
  51         float beat = sequencer.get_current_beat();
  52         if(beat)
  53         {
  54                 float time = beat*60/sequencer.get_beats_per_minute();
  55                 unsigned bytes_per_sec = music_decoder->get_frequency()*get_unit_size(music_decoder->get_format());
  56                 music_decoder->seek(time*bytes_per_sec);
  57         }
  58         streamer->play(*music_decoder);
  59 }
  60
  61 void Demo::tick()
  62 {
  63         Time::TimeStamp t = Time::now();
  64         Time::TimeDelta dt = (last_tick ? frame_interval ? frame_interval : t-last_tick : Time::zero);
  65         last_tick = t;
  66
  67         if(frame_interval)
  68                 next_frame = t+frame_interval;
  69
  70         sequencer.tick(dt);
  71         if(streamer)
  72                 streamer->tick();
  73         view.render();
  74 }
  75
  76 void Demo::seek(const Time::TimeDelta &pos)
  77 {
  78         sequencer.seek(pos*sequencer.get_beats_per_minute()/Time::min);
  79 }