diff options
Diffstat (limited to 'Alc/ALu.c')
| -rw-r--r-- | Alc/ALu.c | 144 |
1 files changed, 144 insertions, 0 deletions
@@ -157,6 +157,150 @@ ALvoid CalcNonAttnSourceParams(ALsource *ALSource, const ALCcontext *ALContext) } } +ALvoid CalcNonAttnStereoSourceParams(ALsource *ALSource, const ALCcontext *ALContext) +{ + ALfloat SourceVolume,ListenerGain,MinVolume,MaxVolume; + ALfloat DryGain, DryGainHF; + ALfloat WetGain[MAX_SENDS]; + ALfloat WetGainHF[MAX_SENDS]; + ALint NumSends, Frequency; + ALboolean DupStereo; + ALenum Format; + ALfloat cw; + ALint i; + + //Get context properties + Format = ALContext->Device->Format; + DupStereo = ALContext->Device->DuplicateStereo; + NumSends = ALContext->Device->NumAuxSends; + Frequency = ALContext->Device->Frequency; + + //Get listener properties + ListenerGain = ALContext->Listener.Gain; + + //Get source properties + SourceVolume = ALSource->flGain; + MinVolume = ALSource->flMinGain; + MaxVolume = ALSource->flMaxGain; + + //1. Multi-channel buffers always play "normal" + ALSource->Params.Pitch = ALSource->flPitch; + + DryGain = SourceVolume; + DryGain = __min(DryGain,MaxVolume); + DryGain = __max(DryGain,MinVolume); + DryGainHF = 1.0f; + + switch(ALSource->DirectFilter.type) + { + case AL_FILTER_LOWPASS: + DryGain *= ALSource->DirectFilter.Gain; + DryGainHF *= ALSource->DirectFilter.GainHF; + break; + } + + for(i = 0;i < OUTPUTCHANNELS;i++) + ALSource->Params.DryGains[i] = 0.0f; + + if(DupStereo == AL_FALSE) + { + ALSource->Params.DryGains[FRONT_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[FRONT_RIGHT] = DryGain * ListenerGain; + } + else + { + switch(Format) + { + case AL_FORMAT_MONO8: + case AL_FORMAT_MONO16: + case AL_FORMAT_MONO_FLOAT32: + case AL_FORMAT_STEREO8: + case AL_FORMAT_STEREO16: + case AL_FORMAT_STEREO_FLOAT32: + ALSource->Params.DryGains[FRONT_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[FRONT_RIGHT] = DryGain * ListenerGain; + break; + + case AL_FORMAT_QUAD8: + case AL_FORMAT_QUAD16: + case AL_FORMAT_QUAD32: + case AL_FORMAT_51CHN8: + case AL_FORMAT_51CHN16: + case AL_FORMAT_51CHN32: + DryGain *= aluSqrt(2.0f/4.0f); + ALSource->Params.DryGains[FRONT_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[FRONT_RIGHT] = DryGain * ListenerGain; + ALSource->Params.DryGains[BACK_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[BACK_RIGHT] = DryGain * ListenerGain; + break; + + case AL_FORMAT_61CHN8: + case AL_FORMAT_61CHN16: + case AL_FORMAT_61CHN32: + DryGain *= aluSqrt(2.0f/4.0f); + ALSource->Params.DryGains[FRONT_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[FRONT_RIGHT] = DryGain * ListenerGain; + ALSource->Params.DryGains[SIDE_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[SIDE_RIGHT] = DryGain * ListenerGain; + break; + + case AL_FORMAT_71CHN8: + case AL_FORMAT_71CHN16: + case AL_FORMAT_71CHN32: + DryGain *= aluSqrt(2.0f/6.0f); + ALSource->Params.DryGains[FRONT_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[FRONT_RIGHT] = DryGain * ListenerGain; + ALSource->Params.DryGains[BACK_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[BACK_RIGHT] = DryGain * ListenerGain; + ALSource->Params.DryGains[SIDE_LEFT] = DryGain * ListenerGain; + ALSource->Params.DryGains[SIDE_RIGHT] = DryGain * ListenerGain; + break; + + default: + break; + } + } + + for(i = 0;i < NumSends;i++) + { + WetGain[i] = SourceVolume; + WetGain[i] = __min(WetGain[i],MaxVolume); + WetGain[i] = __max(WetGain[i],MinVolume); + WetGainHF[i] = 1.0f; + + switch(ALSource->Send[i].WetFilter.type) + { + case AL_FILTER_LOWPASS: + WetGain[i] *= ALSource->Send[i].WetFilter.Gain; + WetGainHF[i] *= ALSource->Send[i].WetFilter.GainHF; + break; + } + + ALSource->Params.WetGains[i] = WetGain[i] * ListenerGain; + } + for(i = NumSends;i < MAX_SENDS;i++) + { + ALSource->Params.WetGains[i] = 0.0f; + WetGainHF[i] = 1.0f; + } + + /* Update filter coefficients. Calculations based on the I3DL2 + * spec. */ + cw = cos(2.0*M_PI * LOWPASSFREQCUTOFF / Frequency); + + /* We use two chained one-pole filters, so we need to take the + * square root of the squared gain, which is the same as the base + * gain. */ + ALSource->Params.iirFilter.coeff = lpCoeffCalc(DryGainHF, cw); + + for(i = 0;i < NumSends;i++) + { + /* We use a one-pole filter, so we need to take the squared gain */ + ALfloat a = lpCoeffCalc(WetGainHF[i]*WetGainHF[i], cw); + ALSource->Params.Send[i].iirFilter.coeff = a; + } +} + ALvoid CalcSourceParams(ALsource *ALSource, const ALCcontext *ALContext) { const ALCdevice *Device = ALContext->Device; |