#ifndef _AL_BUFFER_H_
#define _AL_BUFFER_H_

#include "AL/alc.h"
#include "AL/al.h"
#include "AL/alext.h"

#include "inprogext.h"
#include "atomic.h"


/* User formats */
enum UserFmtType {
    UserFmtUByte,
    UserFmtShort,
    UserFmtFloat,
    UserFmtDouble,
    UserFmtMulaw,
    UserFmtAlaw,
    UserFmtIMA4,
    UserFmtMSADPCM,
};
enum UserFmtChannels {
    UserFmtMono,
    UserFmtStereo,
    UserFmtRear,
    UserFmtQuad,
    UserFmtX51, /* (WFX order) */
    UserFmtX61, /* (WFX order) */
    UserFmtX71, /* (WFX order) */
    UserFmtBFormat2D, /* WXY */
    UserFmtBFormat3D, /* WXYZ */
};

ALsizei BytesFromUserFmt(enum UserFmtType type);
ALsizei ChannelsFromUserFmt(enum UserFmtChannels chans);
inline ALsizei FrameSizeFromUserFmt(enum UserFmtChannels chans, enum UserFmtType type)
{
    return ChannelsFromUserFmt(chans) * BytesFromUserFmt(type);
}


/* Storable formats */
enum FmtType {
    FmtUByte  = UserFmtUByte,
    FmtShort  = UserFmtShort,
    FmtFloat  = UserFmtFloat,
    FmtDouble = UserFmtDouble,
    FmtMulaw  = UserFmtMulaw,
    FmtAlaw   = UserFmtAlaw,
};
enum FmtChannels {
    FmtMono   = UserFmtMono,
    FmtStereo = UserFmtStereo,
    FmtRear   = UserFmtRear,
    FmtQuad   = UserFmtQuad,
    FmtX51    = UserFmtX51,
    FmtX61    = UserFmtX61,
    FmtX71    = UserFmtX71,
    FmtBFormat2D = UserFmtBFormat2D,
    FmtBFormat3D = UserFmtBFormat3D,
};
#define MAX_INPUT_CHANNELS  (8)

/* DevFmtType traits, providing the type, etc given a DevFmtType. */
template<FmtType T>
struct FmtTypeTraits { };

template<>
struct FmtTypeTraits<FmtUByte> { using Type = ALubyte; };
template<>
struct FmtTypeTraits<FmtShort> { using Type = ALshort; };
template<>
struct FmtTypeTraits<FmtFloat> { using Type = ALfloat; };
template<>
struct FmtTypeTraits<FmtDouble> { using Type = ALdouble; };
template<>
struct FmtTypeTraits<FmtMulaw> { using Type = ALubyte; };
template<>
struct FmtTypeTraits<FmtAlaw> { using Type = ALubyte; };


ALsizei BytesFromFmt(enum FmtType type);
ALsizei ChannelsFromFmt(enum FmtChannels chans);
inline ALsizei FrameSizeFromFmt(enum FmtChannels chans, enum FmtType type)
{
    return ChannelsFromFmt(chans) * BytesFromFmt(type);
}


typedef struct ALbuffer {
    ALvoid  *data;

    ALsizei Frequency;
    ALbitfieldSOFT Access;
    ALsizei SampleLen;

    enum FmtChannels FmtChannels;
    enum FmtType     FmtType;
    ALsizei BytesAlloc;

    enum UserFmtType OriginalType;
    ALsizei OriginalSize;
    ALsizei OriginalAlign;

    ALsizei LoopStart;
    ALsizei LoopEnd;

    ATOMIC(ALsizei) UnpackAlign;
    ATOMIC(ALsizei) PackAlign;

    ALbitfieldSOFT MappedAccess;
    ALsizei MappedOffset;
    ALsizei MappedSize;

    /* Number of times buffer was attached to a source (deletion can only occur when 0) */
    RefCount ref;

    /* Self ID */
    ALuint id;
} ALbuffer;

ALvoid ReleaseALBuffers(ALCdevice *device);

#endif