mirror of https://github.com/OpenTTD/OpenTTD.git
89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file allegro_m.cpp Playing music via allegro. */
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#ifdef WITH_ALLEGRO
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#include "../stdafx.h"
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#include "../debug.h"
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#include "allegro_m.h"
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#include "midifile.hpp"
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#include <allegro.h>
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#include "../safeguards.h"
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static FMusicDriver_Allegro iFMusicDriver_Allegro;
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static MIDI *_midi = nullptr;
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/**
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* There are multiple modules that might be using Allegro and
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* Allegro can only be initiated once.
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*/
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extern int _allegro_instance_count;
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std::optional<std::string_view> MusicDriver_Allegro::Start(const StringList &)
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{
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if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, nullptr)) {
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Debug(driver, 0, "allegro: install_allegro failed '{}'", allegro_error);
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return "Failed to set up Allegro";
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}
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_allegro_instance_count++;
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/* Initialise the sound */
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if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, nullptr) != 0) {
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Debug(driver, 0, "allegro: install_sound failed '{}'", allegro_error);
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return "Failed to set up Allegro sound";
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}
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/* Okay, there's no soundcard */
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if (midi_card == MIDI_NONE) {
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Debug(driver, 0, "allegro: no midi card found");
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return "No sound card found";
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}
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return std::nullopt;
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}
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void MusicDriver_Allegro::Stop()
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{
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if (_midi != nullptr) destroy_midi(_midi);
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_midi = nullptr;
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if (--_allegro_instance_count == 0) allegro_exit();
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}
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void MusicDriver_Allegro::PlaySong(const MusicSongInfo &song)
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{
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std::string filename = MidiFile::GetSMFFile(song);
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if (_midi != nullptr) destroy_midi(_midi);
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if (!filename.empty()) {
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_midi = load_midi(filename.c_str());
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play_midi(_midi, false);
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} else {
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_midi = nullptr;
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}
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}
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void MusicDriver_Allegro::StopSong()
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{
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stop_midi();
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}
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bool MusicDriver_Allegro::IsSongPlaying()
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{
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return midi_pos >= 0;
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}
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void MusicDriver_Allegro::SetVolume(uint8_t vol)
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{
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set_volume(-1, vol);
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}
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#endif /* WITH_ALLEGRO */
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