al_helpers.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2022 DS
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
// Copyright (C) 2011 Sebastian 'Bahamada' Rühl
// Copyright (C) 2011 Cyriaque 'Cisoun' Skrapits <cysoun@gmail.com>
// Copyright (C) 2011 Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
 
#pragma once
 
#include "log.h"
#include "util/basic_macros.h"
#include "irr_v3d.h"
 
#if defined(_WIN32)
        #include <al.h>
        #include <alc.h>
        //#include <alext.h>
#elif defined(__APPLE__)
        #define OPENAL_DEPRECATED
        #include <OpenAL/al.h>
        #include <OpenAL/alc.h>
        //#include <OpenAL/alext.h>
#else
        #include <AL/al.h>
        #include <AL/alc.h>
        #include <AL/alext.h>
#endif
 
#include <utility>
 
namespace sound {
 
inline const char *getAlErrorString(ALenum err) noexcept
{
        switch (err) {
        case AL_NO_ERROR:
                return "no error";
        case AL_INVALID_NAME:
                return "invalid name";
        case AL_INVALID_ENUM:
                return "invalid enum";
        case AL_INVALID_VALUE:
                return "invalid value";
        case AL_INVALID_OPERATION:
                return "invalid operation";
        case AL_OUT_OF_MEMORY:
                return "out of memory";
        default:
                return "<unknown OpenAL error>";
        }
}
 
inline ALenum warn_if_al_error(const char *desc)
{
        ALenum err = alGetError();
        if (err == AL_NO_ERROR)
                return err;
        warningstream << "[OpenAL Error] " << desc << ": " << getAlErrorString(err)
                        << std::endl;
        return err;
}
 
inline v3f swap_handedness(v3f v) noexcept
{
        return v3f(-v.X, v.Y, v.Z);
}
 
struct RAIIALSoundBuffer final
{
        RAIIALSoundBuffer() noexcept = default;
        explicit RAIIALSoundBuffer(ALuint buffer) noexcept : m_buffer(buffer) {};
 
        ~RAIIALSoundBuffer() noexcept { reset(0); }
 
        DISABLE_CLASS_COPY(RAIIALSoundBuffer)
 
        RAIIALSoundBuffer(RAIIALSoundBuffer &&other) noexcept : m_buffer(other.release()) {}
        RAIIALSoundBuffer &operator=(RAIIALSoundBuffer &&other) noexcept;
 
        ALuint get() noexcept { return m_buffer; }
 
        ALuint release() noexcept { return std::exchange(m_buffer, 0); }
 
        void reset(ALuint buf) noexcept;
 
        static RAIIALSoundBuffer generate() noexcept;
 
private:
        // According to openal specification:
        // > Deleting buffer name 0 is a legal NOP.
        //
        // and:
        // > [...] the NULL buffer (i.e., 0) which can always be queued.
        ALuint m_buffer = 0;
};
 
} // namespace sound