AudioSystem.hpp

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#pragma once
 
#include "Engine/SystemManager.hpp"
#include "Types.hpp"
#include "raylib.h"
#include <optional>
#include <unordered_map>


class AudioSystem : public System
{
public:

    void Update(const float deltaT) override;
 
    // --- Sound effects -------------------------------------------------

    void PlaySound(const Sound& sound, float volume = 1);

    void StopSound(const Sound& sound);

    void SetSoundVolume(const Sound& sound, float volume);

    static void SetSoundPitch(const Sound& sound, const float pitch);

    static void SetSoundPan(const Sound& sound, const float pan);
 
    // --- Music ---------------------------------------------------------

    void PlayMusic(const Music& music, float volume = 1, const bool loop = false, const float crossfadeS = 0);

    void StopMusic(const float fadeOutDuration = 0);

    bool IsMusicPlaying();

    void PauseMusic();

    void ResumeMusic();

    std::optional<float> GetMusicLengthS();

    std::optional<float> GetMusicPlayedS();

    void SeekMusic(const float timeS);

    void SetMusicVolume(float volume);

    void SetMusicPitch(const float pitch);

    void SetMusicPan(float pan);

    void SetMusicLoop(const bool loop);
 
    // --- Global volume ------------------------------------------------

    static void SetMasterVolume(float volume);

    void SetSFXVolume(float volume);
 
private:
 
    enum class MusicState : u8
    {
        STOPPED,
        PLAYING,
        PAUSED,
        FADING_IN,
        FADING_OUT,
        QUEUED
    };
 
    struct MusicData
    {
        Music music = {};
        float volume = 1;
        float fadeTargetS = 0;
        bool loop = false;
    };
 
    void UpdateFade(const bool fadingIn);
    void MusicSwap();
    void SetMusicVolumeInternal(float volume);
 
    float m_sfxVolume = 1;
    float m_musicVolume = 1;
 
    MusicState m_musicState = MusicState::STOPPED;
    MusicData m_currentMusic;
    std::optional<MusicData> m_nextMusic;
    float m_fadeTargetS = 0;
 
    bool m_sfxVolumeChange = false;
    std::unordered_map<rAudioBuffer*, std::pair<Sound, float>> m_sounds;
};