diff options
Diffstat (limited to 'Alc')
| -rw-r--r-- | Alc/alcReverb.c | 31 |
1 files changed, 14 insertions, 17 deletions
diff --git a/Alc/alcReverb.c b/Alc/alcReverb.c index 1d89e04d..846d3802 100644 --- a/Alc/alcReverb.c +++ b/Alc/alcReverb.c @@ -46,8 +46,8 @@ typedef struct ALverbState { // fragmentation and management code. ALfloat *SampleBuffer; // Master effect low-pass filter (2 chained 1-pole filters). - ALfloat LpCoeff; - ALfloat LpSamples[2]; + FILTER LpFilter; + ALfloat LpHistory[2]; // Initial effect delay and decorrelation. DelayLine Delay; // The tap points for the initial delay. First tap goes to early @@ -318,10 +318,7 @@ static __inline ALvoid ReverbInOut(ALverbState *State, ALfloat in, ALfloat *earl ALfloat taps[4]; // Low-pass filter the incoming sample. - in = in + ((State->LpSamples[0] - in) * State->LpCoeff); - State->LpSamples[0] = in; - in = in + ((State->LpSamples[1] - in) * State->LpCoeff); - State->LpSamples[1] = in; + in = lpFilter2P(&State->LpFilter, 0, in); // Feed the initial delay line. DelayLineIn(&State->Delay, State->Offset, in); @@ -381,9 +378,9 @@ ALvoid VerbUpdate(ALeffectState *effect, ALCcontext *Context, ALeffect *Effect) // Calculate the master low-pass filter (from the master effect HF gain). cw = cos(2.0 * M_PI * Effect->Reverb.HFReference / Context->Frequency); g = __max(Effect->Reverb.GainHF, 0.0001f); - State->LpCoeff = 0.0f; + State->LpFilter.coeff = 0.0f; if(g < 0.9999f) // 1-epsilon - State->LpCoeff = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) / (1 - g); + State->LpFilter.coeff = (1 - g*cw - aluSqrt(2*g*(1-cw) - g*g*(1 - cw*cw))) / (1 - g); // Calculate the initial delay taps. length = Effect->Reverb.ReflectionsDelay; @@ -407,8 +404,8 @@ ALvoid VerbUpdate(ALeffectState *effect, ALCcontext *Context, ALeffect *Effect) State->Tap[1 + index] = (ALuint)(length * Context->Frequency); } - // Calculate the early reflections gain (from the slot gain, master - // effect gain, and reflections gain parameters). + // Calculate the early reflections gain (from the master effect gain, and + // reflections gain parameters). State->Early.Gain = Effect->Reverb.Gain * Effect->Reverb.ReflectionsGain; // Calculate the gain (coefficient) for each early delay line. @@ -420,10 +417,10 @@ ALvoid VerbUpdate(ALeffectState *effect, ALCcontext *Context, ALeffect *Effect) // Calculate the first mixing matrix coefficient (x). mixCoeff = 1.0f - (0.5f * pow(Effect->Reverb.Diffusion, 3.0f)); - // Calculate the late reverb gain (from the slot gain, master effect - // gain, and late reverb gain parameters). Since the output is tapped - // prior to the application of the delay line coefficients, this gain - // needs to be attenuated by the 'x' mix coefficient from above. + // Calculate the late reverb gain (from the master effect gain, and late + // reverb gain parameters). Since the output is tapped prior to the + // application of the delay line coefficients, this gain needs to be + // attenuated by the 'x' mix coefficient from above. State->Late.Gain = Effect->Reverb.Gain * Effect->Reverb.LateReverbGain * mixCoeff; /* To compensate for changes in modal density and decay time of the late @@ -718,9 +715,9 @@ ALeffectState *VerbCreate(ALCcontext *Context) for(index = 0; index < totalLength;index++) State->SampleBuffer[index] = 0.0f; - State->LpCoeff = 0.0f; - State->LpSamples[0] = 0.0f; - State->LpSamples[1] = 0.0f; + State->LpFilter.coeff = 0.0f; + State->LpFilter.history[0] = 0.0f; + State->LpFilter.history[1] = 0.0f; State->Delay.Mask = length[0] - 1; State->Delay.Line = &State->SampleBuffer[0]; totalLength = length[0]; |