#ifndef _AL_SOURCE_H_
#define _AL_SOURCE_H_

#define MAX_SENDS                 4

#include "alFilter.h"
#include "alu.h"
#include "AL/al.h"

#ifdef __cplusplus
extern "C" {
#endif

#define SRC_HISTORY_BITS   (6)
#define SRC_HISTORY_LENGTH (1<<SRC_HISTORY_BITS)
#define SRC_HISTORY_MASK   (SRC_HISTORY_LENGTH-1)

extern enum Resampler DefaultResampler;

extern const ALsizei ResamplerPadding[ResamplerMax];
extern const ALsizei ResamplerPrePadding[ResamplerMax];


typedef struct ALbufferlistitem
{
    struct ALbuffer         *buffer;
    struct ALbufferlistitem *next;
    struct ALbufferlistitem *prev;
} ALbufferlistitem;

typedef struct ALsource
{
    volatile ALfloat   flPitch;
    volatile ALfloat   flGain;
    volatile ALfloat   flOuterGain;
    volatile ALfloat   flMinGain;
    volatile ALfloat   flMaxGain;
    volatile ALfloat   flInnerAngle;
    volatile ALfloat   flOuterAngle;
    volatile ALfloat   flRefDistance;
    volatile ALfloat   flMaxDistance;
    volatile ALfloat   flRollOffFactor;
    volatile ALfloat   vPosition[3];
    volatile ALfloat   vVelocity[3];
    volatile ALfloat   vOrientation[3];
    volatile ALboolean bHeadRelative;
    volatile ALboolean bLooping;
    volatile enum DistanceModel DistanceModel;
    volatile ALboolean DirectChannels;

    enum Resampler Resampler;

    volatile ALenum state;
    ALenum new_state;
    ALuint position;
    ALuint position_fraction;

    ALbufferlistitem *queue; // Linked list of buffers in queue
    ALuint BuffersInQueue;   // Number of buffers in queue
    ALuint BuffersPlayed;    // Number of buffers played on this loop

    ALfloat DirectGain;
    ALfloat DirectGainHF;

    struct {
        struct ALeffectslot *Slot;
        ALfloat WetGain;
        ALfloat WetGainHF;
    } Send[MAX_SENDS];

    volatile ALboolean DryGainHFAuto;
    volatile ALboolean WetGainAuto;
    volatile ALboolean WetGainHFAuto;
    volatile ALfloat   OuterGainHF;

    volatile ALfloat AirAbsorptionFactor;
    volatile ALfloat RoomRolloffFactor;
    volatile ALfloat DopplerFactor;

    ALint lOffset;
    ALint lOffsetType;

    // Source Type (Static, Streaming, or Undetermined)
    volatile ALint lSourceType;

    ALuint NumChannels;
    ALuint SampleSize;

    /* HRTF info */
    ALboolean HrtfMoving;
    ALuint HrtfCounter;
    ALfloat HrtfHistory[MAXCHANNELS][SRC_HISTORY_LENGTH];
    ALfloat HrtfValues[MAXCHANNELS][HRIR_LENGTH][2];
    ALuint HrtfOffset;

    /* Current target parameters used for mixing */
    struct {
        MixerFunc DoMix;

        ALint Step;

        ALfloat HrtfGain;
        ALfloat HrtfDir[3];
        ALfloat HrtfCoeffs[MAXCHANNELS][HRIR_LENGTH][2];
        ALuint HrtfDelay[MAXCHANNELS][2];
        ALfloat HrtfCoeffStep[HRIR_LENGTH][2];
        ALint HrtfDelayStep[2];

        /* A mixing matrix. First subscript is the channel number of the input
         * data (regardless of channel configuration) and the second is the
         * channel target (eg. FRONT_LEFT) */
        ALfloat DryGains[MAXCHANNELS][MAXCHANNELS];

        FILTER iirFilter;
        ALfloat history[MAXCHANNELS*2];

        struct {
            struct ALeffectslot *Slot;
            ALfloat WetGain;
            FILTER iirFilter;
            ALfloat history[MAXCHANNELS];
        } Send[MAX_SENDS];
    } Params;
    volatile ALenum NeedsUpdate;

    ALvoid (*Update)(struct ALsource *self, const ALCcontext *context);

    // Index to itself
    ALuint source;
} ALsource;
#define ALsource_Update(s,a)                 ((s)->Update(s,a))

ALvoid SetSourceState(ALsource *Source, ALCcontext *Context, ALenum state);
ALboolean ApplyOffset(ALsource *Source);

ALvoid ReleaseALSources(ALCcontext *Context);

#ifdef __cplusplus
}
#endif

#endif