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/**
* @file audio.cpp
* Handles audio loading and playback
*
* Copyright (C) 2019 Clyne Sullivan
*
* This program 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, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "audio.hpp"
#include "components/Player.hpp"
#include <AL/alut.h>
#include <iostream>
AudioSystem::AudioSystem(void) :
device(nullptr, [](ALCdevice *d) { alcCloseDevice(d); }),
context(nullptr, [](ALCcontext *c) { alcDestroyContext(c); }) {}
AudioSystem::~AudioSystem(void)
{
alutExit();
// Delete context before device
alcMakeContextCurrent(nullptr);
context.reset();
device.reset();
}
void AudioSystem::configure([[maybe_unused]] entityx::EntityManager& entities,
entityx::EventManager& events)
{
events.subscribe<entityx::ComponentAddedEvent<Audio>>(*this);
events.subscribe<entityx::ComponentRemovedEvent<Audio>>(*this);
// Access device
device.reset(alcOpenDevice(nullptr));
if (!device)
return; // TODO Uh oh
// Create context
context.reset(alcCreateContext(device.get(), nullptr));
if (!alcMakeContextCurrent(context.get()))
return; // TODO Another uh oh
if (alutInitWithoutContext(nullptr, nullptr) != AL_TRUE)
return; // TODO Third uh oh
// Set up listener
ALfloat listenerOri[] = { 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f };
alListener3f(AL_POSITION, 0, 0, 0.0f);
alListener3f(AL_VELOCITY, 0, 0, 0);
alListenerfv(AL_ORIENTATION, listenerOri);
alDistanceModel(AL_LINEAR_DISTANCE);
}
void AudioSystem::update(entityx::EntityManager& entities,
[[maybe_unused]] entityx::EventManager& events,
[[maybe_unused]] entityx::TimeDelta dt)
{
entities.each<Player, Position>(
[]([[maybe_unused]] entityx::Entity e,
[[maybe_unused]] Player& p,
Position &pos)
{
alListener3f(AL_POSITION, pos.x, pos.y, 0.0f);
});
}
void AudioSystem::receive(const entityx::ComponentAddedEvent<Audio>& cae)
{
alGenSources(1, const_cast<ALuint*>(&cae.component->source));
//alGenBuffers(1, const_cast<ALuint*>(&cae.component->buffer));
if (auto buf = alutCreateBufferFromFile(cae.component->fileName.c_str());
buf != AL_NONE) {
const_cast<Audio*>(cae.component.get())->buffer = buf;
alSourcei(cae.component->source, AL_BUFFER, buf);
// TODO Do these values need to be scaled to the world or window?
alSourcef(cae.component->source, AL_MAX_DISTANCE, 25);
alSourcef(cae.component->source, AL_REFERENCE_DISTANCE, 2);
std::cout << "Loaded audio: " << cae.component->fileName << std::endl;
}
}
void AudioSystem::receive(const entityx::ComponentRemovedEvent<Audio>& cae)
{
alDeleteBuffers(1, &cae.component->buffer);
alDeleteSources(1, &cae.component->source);
}
void AudioSystem::playSound(const Position& pos, const Audio& audio)
{
alSource3f(audio.source, AL_POSITION, pos.x, pos.y, 0);
alSourcePlay(audio.source);
}
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