src/music/allegro_m.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file allegro_m.cpp Playing music via allegro. */
  11
  12 #ifdef WITH_ALLEGRO
  13
  14 #include "../stdafx.h"
  15 #include "../debug.h"
  16 #include "allegro_m.h"
  17 #include <allegro.h>
  18
  19 #include "../safeguards.h"
  20
  21 static FMusicDriver_Allegro iFMusicDriver_Allegro;
  22 static MIDI *_midi = NULL;
  23
  24 /**
  25  * There are multiple modules that might be using Allegro and
  26  * Allegro can only be initiated once.
  27  */
  28 extern int _allegro_instance_count;
  29
  30 const char *MusicDriver_Allegro::Start(const char * const *param)
  31 {
  32         if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) {
  33                 DEBUG(driver, 0, "allegro: install_allegro failed '%s'", allegro_error);
  34                 return "Failed to set up Allegro";
  35         }
  36         _allegro_instance_count++;
  37
  38         /* Initialise the sound */
  39         if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) {
  40                 DEBUG(driver, 0, "allegro: install_sound failed '%s'", allegro_error);
  41                 return "Failed to set up Allegro sound";
  42         }
  43
  44         /* Okay, there's no soundcard */
  45         if (midi_card == MIDI_NONE) {
  46                 DEBUG(driver, 0, "allegro: no midi card found");
  47                 return "No sound card found";
  48         }
  49
  50         return NULL;
  51 }
  52
  53 void MusicDriver_Allegro::Stop()
  54 {
  55         if (_midi != NULL) destroy_midi(_midi);
  56         _midi = NULL;
  57
  58         if (--_allegro_instance_count == 0) allegro_exit();
  59 }
  60
  61 void MusicDriver_Allegro::PlaySong(const char *filename)
  62 {
  63         if (_midi != NULL) destroy_midi(_midi);
  64         _midi = load_midi(filename);
  65         play_midi(_midi, false);
  66 }
  67
  68 void MusicDriver_Allegro::StopSong()
  69 {
  70         stop_midi();
  71 }
  72
  73 bool MusicDriver_Allegro::IsSongPlaying()
  74 {
  75         return midi_pos >= 0;
  76 }
  77
  78 void MusicDriver_Allegro::SetVolume(byte vol)
  79 {
  80         set_volume(-1, vol);
  81 }
  82
  83 #endif /* WITH_ALLEGRO */