text: #include "config.h"
  
  #include "alMain.h"
  #include "alSource.h"
  
  #include "hrtf.h"
  #include "mixer_defs.h"
  #include "align.h"
  
  
  static inline void SetupCoeffs(ALfloat (*restrict OutCoeffs)[2],
                                 const HrtfParams *hrtfparams,
                                 ALuint IrSize, ALuint Counter);
  static inline void ApplyCoeffsStep(ALuint Offset, ALfloat (*restrict Values)[2],
                                     const ALuint irSize,
                                     ALfloat (*restrict Coeffs)[2],
                                     const ALfloat (*restrict CoeffStep)[2],
                                     ALfloat left, ALfloat right);
  static inline void ApplyCoeffs(ALuint Offset, ALfloat (*restrict Values)[2],
                                 const ALuint irSize,
                                 ALfloat (*restrict Coeffs)[2],
                                 ALfloat left, ALfloat right);
  
  
  void MixHrtf(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
               ALuint Counter, ALuint Offset, ALuint OutPos, const ALuint IrSize,
               const HrtfParams *hrtfparams, HrtfState *hrtfstate, ALuint BufferSize)
  {
      alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
      ALuint Delay[2];
      ALfloat left, right;
      ALuint pos;
  
      SetupCoeffs(Coeffs, hrtfparams, IrSize, Counter);
      Delay[0] = hrtfparams->Delay[0] - (hrtfparams->DelayStep[0]*Counter);
      Delay[1] = hrtfparams->Delay[1] - (hrtfparams->DelayStep[1]*Counter);
  
      pos = 0;
      for(;pos < BufferSize && pos < Counter;pos++)
      {
          hrtfstate->History[Offset&HRTF_HISTORY_MASK] = data[pos];
          left  = lerp(hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS))&HRTF_HISTORY_MASK],
                       hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS)-1)&HRTF_HISTORY_MASK],
                       (Delay[0]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
          right = lerp(hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS))&HRTF_HISTORY_MASK],
                       hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS)-1)&HRTF_HISTORY_MASK],
                       (Delay[1]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  
          Delay[0] += hrtfparams->DelayStep[0];
          Delay[1] += hrtfparams->DelayStep[1];
  
          hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
          hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
          Offset++;
  
          ApplyCoeffsStep(Offset, hrtfstate->Values, IrSize, Coeffs, hrtfparams->CoeffStep, left, right);
          OutBuffer[0][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][0];
          OutBuffer[1][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][1];
          OutPos++;
      }
  
      Delay[0] >>= HRTFDELAY_BITS;
      Delay[1] >>= HRTFDELAY_BITS;
      for(;pos < BufferSize;pos++)
      {
          hrtfstate->History[Offset&HRTF_HISTORY_MASK] = data[pos];
          left = hrtfstate->History[(Offset-Delay[0])&HRTF_HISTORY_MASK];
          right = hrtfstate->History[(Offset-Delay[1])&HRTF_HISTORY_MASK];
  
          hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
          hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
          Offset++;
  
          ApplyCoeffs(Offset, hrtfstate->Values, IrSize, Coeffs, left, right);
          OutBuffer[0][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][0];
          OutBuffer[1][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][1];
          OutPos++;
      }
  }
  