diff options
Diffstat (limited to 'Alc/ALu.c')
| -rw-r--r-- | Alc/ALu.c | 68 |
1 files changed, 32 insertions, 36 deletions
@@ -210,20 +210,9 @@ static __inline ALvoid aluMatrixVector(ALfloat *vector,ALfloat matrix[3][3]) memcpy(vector, result, sizeof(result)); } -static __inline ALfloat aluComputeSample(ALfloat GainHF, ALfloat sample, ALfloat LastSample) +static __inline ALfloat aluComputeSample(ALfloat GainHF, ALfloat sample, ALfloat LowSample) { - if(GainHF < 1.0f) - { - if(GainHF > 0.0f) - { - sample *= GainHF; - sample += LastSample * (1.0f-GainHF); - } - else - sample = 0.0f; - } - - return sample; + return LowSample + ((sample - LowSample) * GainHF); } static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource, @@ -603,11 +592,13 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma ALuint BlockAlign,BufferSize; ALuint DataSize=0,DataPosInt=0,DataPosFrac=0; ALuint Channels,Frequency,ulExtraSamples; - ALfloat DrySample, WetSample; ALboolean doReverb; ALfloat Pitch; - ALint Looping,increment,State; - ALuint Buffer,fraction; + ALint Looping,State; + ALint fraction,increment; + ALint LowFrac; + ALuint LowStep; + ALuint Buffer; ALuint SamplesToDo; ALsource *ALSource; ALbuffer *ALBuffer; @@ -676,8 +667,6 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma //Get source info DataPosInt = ALSource->position; DataPosFrac = ALSource->position_fraction; - DrySample = ALSource->LastDrySample; - WetSample = ALSource->LastWetSample; //Compute 18.14 fixed point step increment = (ALint)(Pitch*(ALfloat)(1L<<FRACTIONBITS)); @@ -722,36 +711,45 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma BufferSize = min(BufferSize, (SamplesToDo-j)); //Actual sample mixing loop + LowStep = Frequency/5000; + if(LowStep < 1) LowStep = 1; + if(LowStep > 8) LowStep = 8; Data += DataPosInt*Channels; while(BufferSize--) { k = DataPosFrac>>FRACTIONBITS; fraction = DataPosFrac&FRACTIONMASK; + LowFrac = ((DataPosFrac+(DataPosInt<<FRACTIONBITS))/LowStep)&FRACTIONMASK; if(Channels==1) { + ALfloat sample, lowsamp, outsamp; //First order interpolator - ALfloat sample = (ALfloat)((ALshort)(((Data[k]*((1L<<FRACTIONBITS)-fraction))+(Data[k+1]*(fraction)))>>FRACTIONBITS)); + sample = (Data[k]*((1<<FRACTIONBITS)-fraction) + + Data[k+1]*fraction) >> FRACTIONBITS; + lowsamp = (Data[((k+DataPosInt)/LowStep )*LowStep - DataPosInt]*((1<<FRACTIONBITS)-LowFrac) + + Data[((k+DataPosInt)/LowStep + 1)*LowStep - DataPosInt]*LowFrac) >> + FRACTIONBITS; //Direct path final mix buffer and panning - DrySample = aluComputeSample(DryGainHF, sample, DrySample); - DryBuffer[j][FRONT_LEFT] += DrySample*DrySend[FRONT_LEFT]; - DryBuffer[j][FRONT_RIGHT] += DrySample*DrySend[FRONT_RIGHT]; - DryBuffer[j][SIDE_LEFT] += DrySample*DrySend[SIDE_LEFT]; - DryBuffer[j][SIDE_RIGHT] += DrySample*DrySend[SIDE_RIGHT]; - DryBuffer[j][BACK_LEFT] += DrySample*DrySend[BACK_LEFT]; - DryBuffer[j][BACK_RIGHT] += DrySample*DrySend[BACK_RIGHT]; + outsamp = aluComputeSample(DryGainHF, sample, lowsamp); + DryBuffer[j][FRONT_LEFT] += outsamp*DrySend[FRONT_LEFT]; + DryBuffer[j][FRONT_RIGHT] += outsamp*DrySend[FRONT_RIGHT]; + DryBuffer[j][SIDE_LEFT] += outsamp*DrySend[SIDE_LEFT]; + DryBuffer[j][SIDE_RIGHT] += outsamp*DrySend[SIDE_RIGHT]; + DryBuffer[j][BACK_LEFT] += outsamp*DrySend[BACK_LEFT]; + DryBuffer[j][BACK_RIGHT] += outsamp*DrySend[BACK_RIGHT]; //Room path final mix buffer and panning - WetSample = aluComputeSample(WetGainHF, sample, WetSample); + outsamp = aluComputeSample(WetGainHF, sample, lowsamp); if(doReverb) - ReverbBuffer[j] += WetSample; + ReverbBuffer[j] += outsamp; else { - WetBuffer[j][FRONT_LEFT] += WetSample*WetSend[FRONT_LEFT]; - WetBuffer[j][FRONT_RIGHT] += WetSample*WetSend[FRONT_RIGHT]; - WetBuffer[j][SIDE_LEFT] += WetSample*WetSend[SIDE_LEFT]; - WetBuffer[j][SIDE_RIGHT] += WetSample*WetSend[SIDE_RIGHT]; - WetBuffer[j][BACK_LEFT] += WetSample*WetSend[BACK_LEFT]; - WetBuffer[j][BACK_RIGHT] += WetSample*WetSend[BACK_RIGHT]; + WetBuffer[j][FRONT_LEFT] += outsamp*WetSend[FRONT_LEFT]; + WetBuffer[j][FRONT_RIGHT] += outsamp*WetSend[FRONT_RIGHT]; + WetBuffer[j][SIDE_LEFT] += outsamp*WetSend[SIDE_LEFT]; + WetBuffer[j][SIDE_RIGHT] += outsamp*WetSend[SIDE_RIGHT]; + WetBuffer[j][BACK_LEFT] += outsamp*WetSend[BACK_LEFT]; + WetBuffer[j][BACK_RIGHT] += outsamp*WetSend[BACK_RIGHT]; } } else @@ -826,8 +824,6 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma //Update source info ALSource->position = DataPosInt; ALSource->position_fraction = DataPosFrac; - ALSource->LastDrySample = DrySample; - ALSource->LastWetSample = WetSample; } //Handle looping sources |