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Use the biquad high-pass in the ring modulator

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This commit is contained in:
Chris Robinson
2018-05-31 22:21:00 -07:00
parent f765099503
commit 7865ebb6d5
1 changed files with 6 additions and 10 deletions
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Alc/effects/modulator.c
+6 -10
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@@ -125,7 +125,7 @@ static ALboolean ALmodulatorState_deviceUpdate(ALmodulatorState *state, ALCdevic
static ALvoid ALmodulatorState_update(ALmodulatorState *state, const ALCcontext *context, const ALeffectslot *slot, const ALeffectProps *props)
{
const ALCdevice *device = context->Device;
ALfloat cw, a;
ALfloat f0norm;
ALsizei i;
if(props->Modulator.Waveform == AL_RING_MODULATOR_SINUSOID)
@@ -139,15 +139,11 @@ static ALvoid ALmodulatorState_update(ALmodulatorState *state, const ALCcontext
WAVEFORM_FRACONE);
state->step = clampi(state->step, 1, WAVEFORM_FRACONE-1);
/* Custom filter coeffs, which match the old version instead of a low-shelf. */
cw = cosf(F_TAU * props->Modulator.HighPassCutoff / device->Frequency);
a = (2.0f-cw) - sqrtf(powf(2.0f-cw, 2.0f) - 1.0f);
state->Chans[0].Filter.b0 = a;
state->Chans[0].Filter.b1 = -a;
state->Chans[0].Filter.b2 = 0.0f;
state->Chans[0].Filter.a1 = -a;
state->Chans[0].Filter.a2 = 0.0f;
f0norm = props->Modulator.HighPassCutoff / (ALfloat)device->Frequency;
f0norm = maxf(f0norm, FLT_EPSILON);
/* Bandwidth value is constant in octaves. */
BiquadFilter_setParams(&state->Chans[0].Filter, BiquadType_HighPass, 1.0f,
f0norm, calc_rcpQ_from_bandwidth(f0norm, 0.75f));
for(i = 1;i < MAX_EFFECT_CHANNELS;i++)
BiquadFilter_copyParams(&state->Chans[i].Filter, &state->Chans[0].Filter);