Alc/mixer_inc.c

   1 #include "config.h"
   2
   3 #include "alMain.h"
   4 #include "alSource.h"
   5
   6 #include "hrtf.h"
   7 #include "mixer_defs.h"
   8 #include "align.h"
   9
  10
  11 #define REAL_MERGE(a,b) a##b
  12 #define MERGE(a,b) REAL_MERGE(a,b)
  13
  14 #define MixHrtf MERGE(MixHrtf_,SUFFIX)
  15
  16
  17 static inline void SetupCoeffs(ALfloat (*restrict OutCoeffs)[2],
  18                                const HrtfParams *hrtfparams,
  19                                ALuint IrSize, ALuint Counter);
  20 static inline void ApplyCoeffsStep(ALuint Offset, ALfloat (*restrict Values)[2],
  21                                    const ALuint irSize,
  22                                    ALfloat (*restrict Coeffs)[2],
  23                                    const ALfloat (*restrict CoeffStep)[2],
  24                                    ALfloat left, ALfloat right);
  25 static inline void ApplyCoeffs(ALuint Offset, ALfloat (*restrict Values)[2],
  26                                const ALuint irSize,
  27                                ALfloat (*restrict Coeffs)[2],
  28                                ALfloat left, ALfloat right);
  29
  30
  31 void MixHrtf(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
  32              ALuint Counter, ALuint Offset, ALuint OutPos, const ALuint IrSize,
  33              const HrtfParams *hrtfparams, HrtfState *hrtfstate, ALuint BufferSize)
  34 {
  35     alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
  36     ALuint Delay[2];
  37     ALfloat left, right;
  38     ALuint pos;
  39
  40     SetupCoeffs(Coeffs, hrtfparams, IrSize, Counter);
  41     Delay[0] = hrtfparams->Delay[0] - (hrtfparams->DelayStep[0]*Counter);
  42     Delay[1] = hrtfparams->Delay[1] - (hrtfparams->DelayStep[1]*Counter);
  43
  44     pos = 0;
  45     for(;pos < BufferSize && pos < Counter;pos++)
  46     {
  47         hrtfstate->History[Offset&HRTF_HISTORY_MASK] = data[pos];
  48         left  = lerp(hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS))&HRTF_HISTORY_MASK],
  49                      hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS)-1)&HRTF_HISTORY_MASK],
  50                      (Delay[0]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  51         right = lerp(hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS))&HRTF_HISTORY_MASK],
  52                      hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS)-1)&HRTF_HISTORY_MASK],
  53                      (Delay[1]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  54
  55         Delay[0] += hrtfparams->DelayStep[0];
  56         Delay[1] += hrtfparams->DelayStep[1];
  57
  58         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  59         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  60         Offset++;
  61
  62         ApplyCoeffsStep(Offset, hrtfstate->Values, IrSize, Coeffs, hrtfparams->CoeffStep, left, right);
  63         OutBuffer[0][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][0];
  64         OutBuffer[1][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][1];
  65         OutPos++;
  66     }
  67
  68     Delay[0] >>= HRTFDELAY_BITS;
  69     Delay[1] >>= HRTFDELAY_BITS;
  70     for(;pos < BufferSize;pos++)
  71     {
  72         hrtfstate->History[Offset&HRTF_HISTORY_MASK] = data[pos];
  73         left = hrtfstate->History[(Offset-Delay[0])&HRTF_HISTORY_MASK];
  74         right = hrtfstate->History[(Offset-Delay[1])&HRTF_HISTORY_MASK];
  75
  76         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  77         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  78         Offset++;
  79
  80         ApplyCoeffs(Offset, hrtfstate->Values, IrSize, Coeffs, left, right);
  81         OutBuffer[0][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][0];
  82         OutBuffer[1][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][1];
  83         OutPos++;
  84     }
  85 }
  86
  87
  88 #undef MixHrtf
  89
  90 #undef MERGE
  91 #undef REAL_MERGE