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_MERGE2(a,b) a##b
  12 #define MERGE2(a,b) REAL_MERGE2(a,b)
  13
  14 #define MixDirect_Hrtf MERGE2(MixDirect_Hrtf_,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 MixDirect_Hrtf(DirectParams *params, const ALfloat *restrict data, ALuint srcchan,
  29   ALuint OutPos, ALuint BufferSize)
  30 {
  31     ALfloat (*restrict DryBuffer)[BUFFERSIZE] = params->OutBuffer;
  32     const ALuint IrSize = params->Mix.Hrtf.IrSize;
  33     const HrtfParams *hrtfparams = &params->Mix.Hrtf.Params[srcchan];
  34     HrtfState *hrtfstate = &params->Mix.Hrtf.State[srcchan];
  35     ALuint Counter = maxu(params->Counter, OutPos) - OutPos;
  36     ALuint Offset = params->Offset + OutPos;
  37     alignas(16) ALfloat Coeffs[HRIR_LENGTH][2];
  38     ALuint Delay[2];
  39     ALfloat left, right;
  40     ALuint pos;
  41     ALuint c;
  42
  43     pos = 0;
  44     for(c = 0;c < IrSize;c++)
  45     {
  46         Coeffs[c][0] = hrtfparams->Coeffs[c][0] - (hrtfparams->CoeffStep[c][0]*Counter);
  47         Coeffs[c][1] = hrtfparams->Coeffs[c][1] - (hrtfparams->CoeffStep[c][1]*Counter);
  48     }
  49     Delay[0] = hrtfparams->Delay[0] - (hrtfparams->DelayStep[0]*Counter);
  50     Delay[1] = hrtfparams->Delay[1] - (hrtfparams->DelayStep[1]*Counter);
  51
  52     for(pos = 0;pos < BufferSize && pos < Counter;pos++)
  53     {
  54         hrtfstate->History[Offset&SRC_HISTORY_MASK] = data[pos];
  55         left  = lerp(hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS))&SRC_HISTORY_MASK],
  56                      hrtfstate->History[(Offset-(Delay[0]>>HRTFDELAY_BITS)-1)&SRC_HISTORY_MASK],
  57                      (Delay[0]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  58         right = lerp(hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS))&SRC_HISTORY_MASK],
  59                      hrtfstate->History[(Offset-(Delay[1]>>HRTFDELAY_BITS)-1)&SRC_HISTORY_MASK],
  60                      (Delay[1]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  61
  62         Delay[0] += hrtfparams->DelayStep[0];
  63         Delay[1] += hrtfparams->DelayStep[1];
  64
  65         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  66         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  67         Offset++;
  68
  69         ApplyCoeffsStep(Offset, hrtfstate->Values, IrSize, Coeffs, hrtfparams->CoeffStep, left, right);
  70         DryBuffer[FrontLeft][OutPos]  += hrtfstate->Values[Offset&HRIR_MASK][0];
  71         DryBuffer[FrontRight][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][1];
  72         OutPos++;
  73     }
  74
  75     Delay[0] >>= HRTFDELAY_BITS;
  76     Delay[1] >>= HRTFDELAY_BITS;
  77     for(;pos < BufferSize;pos++)
  78     {
  79         hrtfstate->History[Offset&SRC_HISTORY_MASK] = data[pos];
  80         left = hrtfstate->History[(Offset-Delay[0])&SRC_HISTORY_MASK];
  81         right = hrtfstate->History[(Offset-Delay[1])&SRC_HISTORY_MASK];
  82
  83         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  84         hrtfstate->Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  85         Offset++;
  86
  87         ApplyCoeffs(Offset, hrtfstate->Values, IrSize, Coeffs, left, right);
  88         DryBuffer[FrontLeft][OutPos]  += hrtfstate->Values[Offset&HRIR_MASK][0];
  89         DryBuffer[FrontRight][OutPos] += hrtfstate->Values[Offset&HRIR_MASK][1];
  90
  91         OutPos++;
  92     }
  93 }
  94
  95
  96 #undef MixDirect_Hrtf
  97
  98 #undef MERGE2
  99 #undef REAL_MERGE2
 100
 101 #undef UNLIKELY
 102 #undef LIKELY