Alc/mixer_inc.c

   1 #include "config.h"
   2
   3 #include "alMain.h"
   4 #include "alSource.h"
   5 #include "hrtf.h"
   6 #include "mixer_defs.h"
   7
   8
   9 #define REAL_MERGE2(a,b) a##b
  10 #define MERGE2(a,b) REAL_MERGE2(a,b)
  11
  12 #define MixDirect_Hrtf MERGE2(MixDirect_Hrtf_,SUFFIX)
  13
  14
  15 static inline void ApplyCoeffsStep(ALuint Offset, ALfloat (*restrict Values)[2],
  16                                    const ALuint irSize,
  17                                    ALfloat (*restrict Coeffs)[2],
  18                                    const ALfloat (*restrict CoeffStep)[2],
  19                                    ALfloat left, ALfloat right);
  20 static inline void ApplyCoeffs(ALuint Offset, ALfloat (*restrict Values)[2],
  21                                const ALuint irSize,
  22                                ALfloat (*restrict Coeffs)[2],
  23                                ALfloat left, ALfloat right);
  24
  25
  26 void MixDirect_Hrtf(DirectParams *params, const ALfloat *restrict data, ALuint srcchan,
  27   ALuint OutPos, ALuint UNUSED(SamplesToDo), ALuint BufferSize)
  28 {
  29     ALfloat (*restrict DryBuffer)[BUFFERSIZE] = params->OutBuffer;
  30     const ALuint IrSize = params->Mix.Hrtf.Params.IrSize;
  31     const ALint *restrict DelayStep = params->Mix.Hrtf.Params.DelayStep;
  32     const ALfloat (*restrict CoeffStep)[2] = params->Mix.Hrtf.Params.CoeffStep;
  33     const ALfloat (*restrict TargetCoeffs)[2] = params->Mix.Hrtf.Params.Coeffs[srcchan];
  34     const ALuint *restrict TargetDelay = params->Mix.Hrtf.Params.Delay[srcchan];
  35     ALfloat *restrict History = params->Mix.Hrtf.State.History[srcchan];
  36     ALfloat (*restrict Values)[2] = params->Mix.Hrtf.State.Values[srcchan];
  37     ALuint Counter = maxu(params->Counter, OutPos) - OutPos;
  38     ALuint Offset = params->Offset + OutPos;
  39     ALIGN(16) ALfloat Coeffs[HRIR_LENGTH][2];
  40     ALuint Delay[2];
  41     ALfloat left, right;
  42     ALuint pos;
  43     ALuint c;
  44
  45     pos = 0;
  46     for(c = 0;c < IrSize;c++)
  47     {
  48         Coeffs[c][0] = TargetCoeffs[c][0] - (CoeffStep[c][0]*Counter);
  49         Coeffs[c][1] = TargetCoeffs[c][1] - (CoeffStep[c][1]*Counter);
  50     }
  51
  52     Delay[0] = TargetDelay[0] - (DelayStep[0]*Counter);
  53     Delay[1] = TargetDelay[1] - (DelayStep[1]*Counter);
  54
  55     for(pos = 0;pos < BufferSize && pos < Counter;pos++)
  56     {
  57         History[Offset&SRC_HISTORY_MASK] = data[pos];
  58         left  = lerp(History[(Offset-(Delay[0]>>HRTFDELAY_BITS))&SRC_HISTORY_MASK],
  59                      History[(Offset-(Delay[0]>>HRTFDELAY_BITS)-1)&SRC_HISTORY_MASK],
  60                      (Delay[0]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  61         right = lerp(History[(Offset-(Delay[1]>>HRTFDELAY_BITS))&SRC_HISTORY_MASK],
  62                      History[(Offset-(Delay[1]>>HRTFDELAY_BITS)-1)&SRC_HISTORY_MASK],
  63                      (Delay[1]&HRTFDELAY_MASK)*(1.0f/HRTFDELAY_FRACONE));
  64
  65         Delay[0] += DelayStep[0];
  66         Delay[1] += DelayStep[1];
  67
  68         Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  69         Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  70         Offset++;
  71
  72         ApplyCoeffsStep(Offset, Values, IrSize, Coeffs, CoeffStep, left, right);
  73         DryBuffer[FrontLeft][OutPos]  += Values[Offset&HRIR_MASK][0];
  74         DryBuffer[FrontRight][OutPos] += Values[Offset&HRIR_MASK][1];
  75         OutPos++;
  76     }
  77
  78     Delay[0] >>= HRTFDELAY_BITS;
  79     Delay[1] >>= HRTFDELAY_BITS;
  80     for(;pos < BufferSize;pos++)
  81     {
  82         History[Offset&SRC_HISTORY_MASK] = data[pos];
  83         left = History[(Offset-Delay[0])&SRC_HISTORY_MASK];
  84         right = History[(Offset-Delay[1])&SRC_HISTORY_MASK];
  85
  86         Values[(Offset+IrSize)&HRIR_MASK][0] = 0.0f;
  87         Values[(Offset+IrSize)&HRIR_MASK][1] = 0.0f;
  88         Offset++;
  89
  90         ApplyCoeffs(Offset, Values, IrSize, Coeffs, left, right);
  91         DryBuffer[FrontLeft][OutPos]  += Values[Offset&HRIR_MASK][0];
  92         DryBuffer[FrontRight][OutPos] += Values[Offset&HRIR_MASK][1];
  93
  94         OutPos++;
  95     }
  96 }
  97
  98
  99 #undef MixDirect_Hrtf
 100
 101 #undef MERGE2
 102 #undef REAL_MERGE2
 103
 104 #undef UNLIKELY
 105 #undef LIKELY