mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-11-11 13:10:45 +00:00
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
/*
|
|
* This file is part of OpenTTD.
|
|
* 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.
|
|
* 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.
|
|
* 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/>.
|
|
*/
|
|
|
|
/** @file allegro_s.cpp Playing sound via Allegro. */
|
|
|
|
#ifdef WITH_ALLEGRO
|
|
|
|
#include "../stdafx.h"
|
|
|
|
#include "../mixer.h"
|
|
#include "../debug.h"
|
|
#include "allegro_s.h"
|
|
#include <allegro.h>
|
|
|
|
#include "../safeguards.h"
|
|
|
|
static FSoundDriver_Allegro iFSoundDriver_Allegro;
|
|
/** The stream we are writing too */
|
|
static AUDIOSTREAM *_stream = nullptr;
|
|
/** The number of samples in the buffer */
|
|
static int _buffer_size;
|
|
|
|
void SoundDriver_Allegro::MainLoop()
|
|
{
|
|
/* We haven't opened a stream yet */
|
|
if (_stream == nullptr) return;
|
|
|
|
void *data = get_audio_stream_buffer(_stream);
|
|
/* We don't have to fill the stream yet */
|
|
if (data == nullptr) return;
|
|
|
|
/* Mix the samples */
|
|
MxMixSamples(data, _buffer_size);
|
|
|
|
/* Allegro sound is always unsigned, so we need to correct that */
|
|
uint16 *snd = (uint16*)data;
|
|
for (int i = 0; i < _buffer_size * 2; i++) snd[i] ^= 0x8000;
|
|
|
|
/* Tell we've filled the stream */
|
|
free_audio_stream_buffer(_stream);
|
|
}
|
|
|
|
/**
|
|
* There are multiple modules that might be using Allegro and
|
|
* Allegro can only be initiated once.
|
|
*/
|
|
extern int _allegro_instance_count;
|
|
|
|
const char *SoundDriver_Allegro::Start(const StringList &parm)
|
|
{
|
|
if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, nullptr)) {
|
|
DEBUG(driver, 0, "allegro: install_allegro failed '%s'", allegro_error);
|
|
return "Failed to set up Allegro";
|
|
}
|
|
_allegro_instance_count++;
|
|
|
|
/* Initialise the sound */
|
|
if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, nullptr) != 0) {
|
|
DEBUG(driver, 0, "allegro: install_sound failed '%s'", allegro_error);
|
|
return "Failed to set up Allegro sound";
|
|
}
|
|
|
|
/* Okay, there's no soundcard */
|
|
if (digi_card == DIGI_NONE) {
|
|
DEBUG(driver, 0, "allegro: no sound card found");
|
|
return "No sound card found";
|
|
}
|
|
|
|
int hz = GetDriverParamInt(parm, "hz", 44100);
|
|
_buffer_size = GetDriverParamInt(parm, "samples", 1024) * hz / 11025;
|
|
_stream = play_audio_stream(_buffer_size, 16, true, hz, 255, 128);
|
|
MxInitialize(hz);
|
|
return nullptr;
|
|
}
|
|
|
|
void SoundDriver_Allegro::Stop()
|
|
{
|
|
if (_stream != nullptr) {
|
|
stop_audio_stream(_stream);
|
|
_stream = nullptr;
|
|
}
|
|
remove_sound();
|
|
|
|
if (--_allegro_instance_count == 0) allegro_exit();
|
|
}
|
|
|
|
#endif /* WITH_ALLEGRO */
|