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Location: cpp/openttd-patchpack/source/src/sound/allegro_s.cpp - annotation
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(svn r19502) -Codechange: During NewGRF loading, store rail type labels in temporary data and process after loading has finished. This avoids deactivated rail vehicles being reactivated if the climate property is set after the rail type property.
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/*
* 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>
static FSoundDriver_Allegro iFSoundDriver_Allegro;
/** The stream we are writing too */
static AUDIOSTREAM *_stream = NULL;
/** The number of samples in the buffer */
static int _buffer_size;
void SoundDriver_Allegro::MainLoop()
{
/* We haven't opened a stream yet */
if (_stream == NULL) return;
void *data = get_audio_stream_buffer(_stream);
/* We don't have to fill the stream yet */
if (data == NULL) 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 char * const *parm)
{
if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) {
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, NULL) != 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 NULL;
}
void SoundDriver_Allegro::Stop()
{
if (_stream != NULL) {
stop_audio_stream(_stream);
_stream = NULL;
}
remove_sound();
if (--_allegro_instance_count == 0) allegro_exit();
}
#endif /* WITH_ALLEGRO */
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