diff options
Diffstat (limited to 'Alc/ALu.c')
| -rw-r--r-- | Alc/ALu.c | 106 |
1 files changed, 104 insertions, 2 deletions
@@ -527,6 +527,39 @@ ALvoid CalcNonAttnSourceParams(ALvoice *voice, const ALsource *ALSource, const A voice->IsHrtf = AL_FALSE; } + else if(Device->Hrtf) + { + voice->Direct.OutBuffer = &voice->Direct.OutBuffer[voice->Direct.OutChannels]; + voice->Direct.OutChannels = 2; + for(c = 0;c < num_channels;c++) + { + if(chans[c].channel == LFE) + { + /* Skip LFE */ + voice->Direct.Hrtf.Params[c].Delay[0] = 0; + voice->Direct.Hrtf.Params[c].Delay[1] = 0; + for(i = 0;i < HRIR_LENGTH;i++) + { + voice->Direct.Hrtf.Params[c].Coeffs[i][0] = 0.0f; + voice->Direct.Hrtf.Params[c].Coeffs[i][1] = 0.0f; + } + } + else + { + /* Get the static HRIR coefficients and delays for this + * channel. */ + GetLerpedHrtfCoeffs(Device->Hrtf, + chans[c].elevation, chans[c].angle, 1.0f, DryGain, + voice->Direct.Hrtf.Params[c].Coeffs, + voice->Direct.Hrtf.Params[c].Delay); + } + } + voice->Direct.Counter = 0; + voice->Direct.Moving = AL_TRUE; + voice->Direct.Hrtf.IrSize = GetHrtfIrSize(Device->Hrtf); + + voice->IsHrtf = AL_TRUE; + } else { for(c = 0;c < num_channels;c++) @@ -934,6 +967,73 @@ ALvoid CalcSourceParams(ALvoice *voice, const ALsource *ALSource, const ALCconte BufferListItem = BufferListItem->next; } + if(Device->Hrtf) + { + /* Use a binaural HRTF algorithm for stereo headphone playback */ + ALfloat delta, ev = 0.0f, az = 0.0f; + ALfloat radius = ALSource->Radius; + ALfloat dirfact = 1.0f; + + voice->Direct.OutBuffer = &voice->Direct.OutBuffer[voice->Direct.OutChannels]; + voice->Direct.OutChannels = 2; + + if(Distance > FLT_EPSILON) + { + ALfloat invlen = 1.0f/Distance; + Position[0] *= invlen; + Position[1] *= invlen; + Position[2] *= invlen; + + /* Calculate elevation and azimuth only when the source is not at + * the listener. This prevents +0 and -0 Z from producing + * inconsistent panning. Also, clamp Y in case FP precision errors + * cause it to land outside of -1..+1. */ + ev = asinf(clampf(Position[1], -1.0f, 1.0f)); + az = atan2f(Position[0], -Position[2]*ZScale); + } + if(radius > Distance) + dirfact *= Distance / radius; + + /* Check to see if the HRIR is already moving. */ + if(voice->Direct.Moving) + { + /* Calculate the normalized HRTF transition factor (delta). */ + delta = CalcHrtfDelta(voice->Direct.Hrtf.Gain, DryGain, + voice->Direct.Hrtf.Dir, Position); + /* If the delta is large enough, get the moving HRIR target + * coefficients, target delays, steppping values, and counter. */ + if(delta > 0.001f) + { + ALuint counter = GetMovingHrtfCoeffs(Device->Hrtf, + ev, az, dirfact, DryGain, delta, voice->Direct.Counter, + voice->Direct.Hrtf.Params[0].Coeffs, voice->Direct.Hrtf.Params[0].Delay, + voice->Direct.Hrtf.Params[0].CoeffStep, voice->Direct.Hrtf.Params[0].DelayStep + ); + voice->Direct.Counter = counter; + voice->Direct.Hrtf.Gain = DryGain; + voice->Direct.Hrtf.Dir[0] = Position[0]; + voice->Direct.Hrtf.Dir[1] = Position[1]; + voice->Direct.Hrtf.Dir[2] = Position[2]; + } + } + else + { + /* Get the initial (static) HRIR coefficients and delays. */ + GetLerpedHrtfCoeffs(Device->Hrtf, ev, az, dirfact, DryGain, + voice->Direct.Hrtf.Params[0].Coeffs, + voice->Direct.Hrtf.Params[0].Delay); + voice->Direct.Counter = 0; + voice->Direct.Moving = AL_TRUE; + voice->Direct.Hrtf.Gain = DryGain; + voice->Direct.Hrtf.Dir[0] = Position[0]; + voice->Direct.Hrtf.Dir[1] = Position[1]; + voice->Direct.Hrtf.Dir[2] = Position[2]; + } + voice->Direct.Hrtf.IrSize = GetHrtfIrSize(Device->Hrtf); + + voice->IsHrtf = AL_TRUE; + } + else { MixGains *gains = voice->Direct.Gains[0]; ALfloat radius = ALSource->Radius; @@ -1168,8 +1268,10 @@ ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size) HrtfMixerFunc HrtfMix = SelectHrtfMixer(); ALuint irsize = GetHrtfIrSize(device->Hrtf); for(c = 0;c < device->NumChannels;c++) - HrtfMix(&device->DryBuffer[outchanoffset], device->DryBuffer[c], device->Hrtf_Offset, irsize, - &device->Hrtf_Params[c], &device->Hrtf_State[c], SamplesToDo); + HrtfMix(&device->DryBuffer[outchanoffset], device->DryBuffer[c], 0.0f, + device->Hrtf_Offset, 0.0f, irsize, &device->Hrtf_Params[c], + &device->Hrtf_State[c], SamplesToDo + ); device->Hrtf_Offset += SamplesToDo; } else if(device->Bs2b) |