#ifndef _AL_SOURCE_H_
#define _AL_SOURCE_H_

#define MAX_SENDS                 4

#include "alMain.h"
#include "alu.h"
#include "hrtf.h"

#ifdef __cplusplus
extern "C" {
#endif

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 ALactivesource {
    struct ALsource *Source;

    /** Method to update mixing parameters. */
    ALvoid (*Update)(struct ALactivesource *self, const ALCcontext *context);

    /** Current target parameters used for mixing. */
    ResamplerFunc Resample;
    union {
        MixerFunc Mix;
        HrtfMixerFunc HrtfMix;
    } Dry;
    MixerFunc WetMix;

    ALboolean IsHrtf;
    ALint Step;

    ALuint Offset; /* Number of output samples mixed since starting. */

    DirectParams Direct;
    SendParams Send[MAX_SENDS];
} ALactivesource;


typedef struct ALsource {
    /** Source properties. */
    volatile ALfloat   Pitch;
    volatile ALfloat   Gain;
    volatile ALfloat   OuterGain;
    volatile ALfloat   MinGain;
    volatile ALfloat   MaxGain;
    volatile ALfloat   InnerAngle;
    volatile ALfloat   OuterAngle;
    volatile ALfloat   RefDistance;
    volatile ALfloat   MaxDistance;
    volatile ALfloat   RollOffFactor;
    volatile ALfloat   Position[3];
    volatile ALfloat   Velocity[3];
    volatile ALfloat   Orientation[3];
    volatile ALboolean HeadRelative;
    volatile ALboolean Looping;
    volatile enum DistanceModel DistanceModel;
    volatile ALboolean DirectChannels;

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

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

    enum Resampler Resampler;

    /**
     * Last user-specified offset, and the offset type (bytes, samples, or
     * seconds).
     */
    ALdouble Offset;
    ALenum   OffsetType;

    /** Source type (static, streaming, or undetermined) */
    volatile ALint SourceType;

    /** Source state (initial, playing, paused, or stopped) */
    volatile ALenum state;
    ALenum new_state;

    /**
     * Source offset in samples, relative to the currently playing buffer, NOT
     * the whole queue, and the fractional (fixed-point) offset to the next
     * sample.
     */
    ALuint position;
    ALuint position_fraction;

    /** Source Buffer Queue info. */
    ALbufferlistitem *volatile queue;
    ALbufferlistitem *volatile current_buffer;
    RWLock queue_lock;

    /** Current buffer sample info. */
    ALuint NumChannels;
    ALuint SampleSize;

    /** Direct filter and auxiliary send info. */
    struct {
        ALfloat Gain;
        ALfloat GainHF;
        ALfloat HFReference;
        ALfloat GainLF;
        ALfloat LFReference;
    } Direct;
    struct {
        struct ALeffectslot *Slot;
        ALfloat Gain;
        ALfloat GainHF;
        ALfloat HFReference;
        ALfloat GainLF;
        ALfloat LFReference;
    } Send[MAX_SENDS];

    /** Source needs to update its mixing parameters. */
    volatile ALenum NeedsUpdate;

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

inline struct ALsource *LookupSource(ALCcontext *context, ALuint id)
{ return (struct ALsource*)LookupUIntMapKey(&context->SourceMap, id); }
inline struct ALsource *RemoveSource(ALCcontext *context, ALuint id)
{ return (struct ALsource*)RemoveUIntMapKey(&context->SourceMap, id); }

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

ALvoid ReleaseALSources(ALCcontext *Context);

#ifdef __cplusplus
}
#endif

#endif