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