cpp/openttd-patchpack/source Files · src/sound/allegro_s.cpp

Files @ r24498:e9114d9ab04a

Branch filter:

Location: cpp/openttd-patchpack/source/src/sound/allegro_s.cpp

r24498:e9114d9ab04a 2.7 KiB text/x-c Show Annotation Show as Raw Download as Raw

Patric Stout

Fix #6468: don't store version of AIs-started-via-console in name

You can do: "startai myai.3", which starts version 3 of "myai".
This is very useful for testing save/load code between different
versions of your AI.

However, when using this syntax, the AI got saved as "myai.3" as
name of the AI, instead of "myai". This caused several problems,
like indicating to the user the AI could not be found, but still
load the AI. But in all cases, the AI never got the chance to
load the saved data, making the whole reason this exists pointless.

By splitting the name and version already in the console command,
the code becomes simpler and AIs started this way now follow the
normal flow after initialization.

/*
 * 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 */