AdventuresInLestoria/Adventures in Lestoria/Audio.cpp

#pragma region License
/*
License (OLC-3)
~~~~~~~~~~~~~~~

Copyright 2024 Joshua Sigona <sigonasr2@gmail.com>

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

1. Redistributions or derivations of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions or derivative works in binary form must reproduce the above
copyright notice. This list of conditions and the following	disclaimer must be
reproduced in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may
be used to endorse or promote products derived from this software without specific
prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS	"AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL THE COPYRIGHT	HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL,	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.

Portions of this software are copyright © 2023 The FreeType
Project (www.freetype.org). Please see LICENSE_FT.txt for more information.
All rights reserved.
*/
#pragma endregion
#include "Audio.h"
#include "AdventuresInLestoria.h"
#include "DEFINES.h"
#include "util.h"

INCLUDE_game
INCLUDE_DATA

float Audio::defaultFadeTime;

void Audio::Initialize(){
	Engine().SetBackgroundPlay(true);
	Self().events.insert("Default Volume");
	for(auto&[key,data]:DATA["Events"]){
		if(key!="SFX"){ //HACK ALERT! We are specifically excluding the SFX key because it's used to specify the sound effects in-game.
			Self().events.insert(key);
		}
	}
	for(auto&[songFileName,size]:DATA["BGM"]){
		auto&data=DATA["BGM"][songFileName];
		if(songFileName!="Default Fade Time"){
			int channelCounter=0;

			BGM&bgm=Self().bgm[songFileName];

			bgm.SetFileName(songFileName);
			bgm.SetName(data["Track Name"].GetString());

			while(data.HasProperty(std::format("channel[{}]",channelCounter))){
				std::string channelName=data[std::format("channel[{}]",channelCounter)].GetString();
				if(!std::filesystem::exists("bgm_directory"_S+channelName))ERR(std::format("WARNING! Could not load file {} for track {}",channelName,songFileName));
				bgm.AddChannel(channelName);
				channelCounter++;
			}

			if(!data["Events"].HasProperty("Default Volume"))ERR(std::format("WARNING! Track {} does not have a Default Volume parameter!",bgm.GetName()));

			if(data.HasProperty("Fade Time")){
				bgm.SetFadeTime(data["Fade Time"].GetReal());
			}else{
				bgm.SetFadeTime(defaultFadeTime);
			}


			if(data.HasProperty("Events")){
				for(auto&eventName:Self().events){
					auto&eventData=data["Events"][eventName];

					if(eventData.GetValueCount()==0){ //We assume we'll inherit from the default volume instead.
						VolumeList volumes;
						for(int i=0;i<eventData.GetValueCount();i++){
							volumes.push_back(data["Events"]["Default Volume"].GetInt(i)/100.f);
						}
						bgm.AddEventVolumes(eventName,volumes);
					}else{
						if(eventData.GetValueCount()!=bgm.GetChannelCount())ERR(std::format("WARNING! {} parameters do not match channel count. {} != {}",eventName,eventData.GetValueCount(),bgm.GetChannelCount()));
						VolumeList volumes;
						for(int i=0;i<eventData.GetValueCount();i++){
							volumes.push_back(eventData.GetInt(i)/100.f);
						}
						bgm.AddEventVolumes(eventName,volumes);
					}
				}
			}
		}else{
			defaultFadeTime=data.GetReal();
		}
	}

	Self().bgm.SetInitialized();
}

MiniAudio&Audio::Engine(){
	return game->audioEngine.audioEngine;
}
void Audio::Play(const std::string_view sound){
	Engine().Play(std::string(sound));
};
const size_t Audio::LoadAndPlay(const std::string_view sound,const bool loop){
	size_t soundID=Engine().LoadSound(std::string(sound));
	Engine().Play(soundID,loop);
	return soundID;
};
void Audio::PlayBGM(const std::string_view sound,const bool loop){
	BGM&track=Self().bgm[std::string(sound)];
	Self().fullyLoaded=false;
	StopBGM(); //Stop any currently playing track.
	Self().playParams={std::string(sound),loop};
	Self().playBGMWaitTime=0.7f;
};

void Audio::StopBGM(){
	if(Self().BGMIsPlaying()){
		BGM&currentTrack=Self().bgm[Self().currentBGM];
		for(int trackID:currentTrack.GetChannelIDs()){
			Engine().Stop(trackID);
		}
	}
}

const bool Audio::BGMIsPlaying(){
	return Self().currentBGM.length()>0;
}

const Volume&Audio::BGM::GetVolume(const Event&eventName,const ChannelID&id)const{
	return eventVolumes.GetVolumes(eventName).at(id);
}

void Audio::BGM::Load(){
	if(Self().BGMIsPlaying()){
		if(Self().GetTrackName()==songFileName)return; //We are already playing the current track.
		BGM&bgm=Self().bgm[Self().GetTrackName()];
		if(Self().BGMIsPlaying()){
			bgm.Unload();
		}
	}
	Self().currentBGM=songFileName;
	BGM&newBgm=Self().bgm[songFileName];
	if(newBgm.channels.size()>0)ERR(std::format("WARNING! The size of the channels list is greater than zero! Size: {}",newBgm.channels.size()));
	for(const ChannelName&channel:newBgm.GetChannels()){
		ChannelID soundID=Engine().LoadSound("bgm_directory"_S+channel);
		newBgm.channels.push_back(soundID);
	}
}

void Audio::BGM::Unload(){
	BGM&bgm=Self().bgm[Self().currentBGM];
	for(const ChannelID&id:channels){
		Engine().UnloadSound(id);
	}
	channels.clear();
	Self().currentBGM="";
}

const ChannelID&Audio::BGM::GetChannelID(const int index){
	return channels[index];
}

const ChannelIDList&Audio::BGM::GetChannelIDs()const{
	return channels;
}

const std::vector<ChannelName>&Audio::BGM::GetChannels()const{
	return channelNames;
}

void Audio::BGM::SetFadeTime(const float fadeTime){
	this->fadeTime=fadeTime;
}

void Audio::BGM::AddEventVolumes(const Event&eventName,const VolumeList&volumes){
	eventVolumes.AddEventInfo(eventName,volumes);
}

const size_t Audio::BGM::GetChannelCount()const{
	return channelNames.size();
}

const SongName&Audio::BGM::GetName()const{
	return songName;
}

void Audio::BGM::SetName(std::string_view name){
	songName=name;
}

void Audio::BGM::SetFileName(std::string_view name){
	songFileName=name;
}

void Audio::BGM::AddChannel(const ChannelName&name){
	channelNames.push_back(name);
}

const VolumeList&Audio::EventData::GetVolumes(const Event&event)const{
	if(eventInfo.find(event)!=eventInfo.end())return eventInfo.at(event);
	return eventInfo.at("Default Volume");
}

void Audio::EventData::AddEventInfo(const Event&eventName,const VolumeList&volumes){
	eventInfo[eventName]=volumes;
}

Audio&Audio::Self(){
	return game->audioEngine;
}

const Event&Audio::GetAudioEvent(){
	return Self().currentAudioEvent;
}
void Audio::SetAudioEvent(const Event&eventName){
	if(Self().events.find(eventName)==Self().events.end())ERR(std::format("WARNING! cannot find event {}",eventName));

	Self().currentAudioEvent=eventName;
	
	if(Audio::BGMIsPlaying()){
		BGM&currentBgm=Self().bgm[Self().currentBGM];

		Self().targetVolumes.clear();

		Self().fadeToTargetVolumeTime=currentBgm.GetFadeTime();
		for(int currentTrackIndex=0;int trackID:currentBgm.GetChannelIDs()){
			//Engine().SetVolume(trackID,currentBgm.GetVolume(eventName,currentTrackIndex));
			Self().targetVolumes.push_back(currentBgm.GetVolume(eventName,currentTrackIndex)); //Set the target volumes so that the engine can gradually move the volumes over to the new settings.
			currentTrackIndex++;
		}
	}
}

std::string operator""_SFX(const char*key,size_t length){
	return "sfx_directory"_S+std::string(key,length);
}

const SongName&Audio::GetTrackName(){
	return Self().currentBGM;
}

void Audio::Update(){
	if(Self().playBGMWaitTime>0.f){
		Self().playBGMWaitTime=std::max(Self().playBGMWaitTime-game->GetElapsedTime(),0.f);
		if(Self().playBGMWaitTime==0.f){
			BGM&track=Self().bgm[Self().playParams.sound];
			track.Load();
			Self().prevVolumes.clear();
			Self().targetVolumes.clear();
			Self().fadeToTargetVolumeTime=0.f;
			for(int channelListIndex=0;int trackID:track.GetChannelIDs()){
				float channelVol=track.GetVolume(Self().currentAudioEvent,channelListIndex);
				Self().prevVolumes.push_back(channelVol);
				Self().targetVolumes.push_back(channelVol);
				Engine().SetVolume(trackID,channelVol);
				Engine().Play(trackID,Self().playParams.loop);
				channelListIndex++;
			}
			Self().fullyLoaded=true;
		}
	}

	if(Self().fadeToTargetVolumeTime>0.f){
		Self().fadeToTargetVolumeTime=std::max(0.f,Self().fadeToTargetVolumeTime-game->GetElapsedTime());
		for(int counter=0;float&vol:Self().prevVolumes){
			const BGM&currentBgm=Self().bgm[Self().currentBGM];
			Engine().SetVolume(currentBgm.GetChannelIDs()[counter],util::lerp(vol,Self().targetVolumes[counter],1-(Self().fadeToTargetVolumeTime/currentBgm.GetFadeTime())));
			counter++;
		}
	}
}

const bool Audio::BGMFullyLoaded(){
	return Self().fullyLoaded;
}

const float&Audio::BGM::GetFadeTime()const{
	return fadeTime;
}