# allegro_m.cpp

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    00001 /* $Id: allegro_m.cpp 17787 2009-10-17 14:39:43Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * 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.
    00006  * 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.
    00007  * 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/>.
    00008  */
    00009
    00012 #ifdef WITH_ALLEGRO
    00013
    00014 #include "../stdafx.h"
    00015 #include "../debug.h"
    00016 #include "allegro_m.h"
    00017 #include <allegro.h>
    00018
    00019 static FMusicDriver_Allegro iFMusicDriver_Allegro;
    00020 static MIDI *_midi = NULL;
    00021
    00024 extern int _allegro_instance_count;
    00025
    00026 const char *MusicDriver_Allegro::Start(const char * const *param)
    00027 {
    00028   if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) {
    00029     DEBUG(driver, 0, "allegro: install_allegro failed '%s'", allegro_error);
    00030     return "Failed to set up Allegro";
    00031   }
    00032   _allegro_instance_count++;
    00033
    00034   /* Initialise the sound */
    00035   if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) {
    00036     DEBUG(driver, 0, "allegro: install_sound failed '%s'", allegro_error);
    00037     return "Failed to set up Allegro sound";
    00038   }
    00039
    00040   /* Okay, there's no soundcard */
    00041   if (midi_card == MIDI_NONE) {
    00042     DEBUG(driver, 0, "allegro: no midi card found");
    00043     return "No sound card found";
    00044   }
    00045
    00046   return NULL;
    00047 }
    00048
    00049 void MusicDriver_Allegro::Stop()
    00050 {
    00051   if (_midi != NULL) destroy_midi(_midi);
    00052   _midi = NULL;
    00053
    00054   if (--_allegro_instance_count == 0) allegro_exit();
    00055 }
    00056
    00057 void MusicDriver_Allegro::PlaySong(const char *filename)
    00058 {
    00059   if (_midi != NULL) destroy_midi(_midi);
    00060   _midi = load_midi(filename);
    00061   play_midi(_midi, false);
    00062 }
    00063
    00064 void MusicDriver_Allegro::StopSong()
    00065 {
    00066   stop_midi();
    00067 }
    00068
    00069 bool MusicDriver_Allegro::IsSongPlaying()
    00070 {
    00071   return midi_pos >= 0;
    00072 }
    00073
    00074 void MusicDriver_Allegro::SetVolume(byte vol)
    00075 {
    00076   set_volume(-1, vol);
    00077 }
    00078
    00079 #endif /* WITH_ALLEGRO */