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Include the echo's attenuation of the late reverb in the late reverb gain

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This commit is contained in:
Chris Robinson 2015-10-29 02:10:07 -07:00
parent 62f1df77d7
commit 79ad54f0c3
1 changed files with 29 additions and 24 deletions
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53
Alc/effects/reverb.c
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@ -152,8 +152,8 @@ typedef struct ALreverbState {
ALfloat LpCoeff;
ALfloat LpSample;
// Echo mixing coefficients.
ALfloat MixCoeff[2];
// Echo mixing coefficient.
ALfloat MixCoeff;
} Echo;
// The current read offset for all delay lines.
@ -464,11 +464,11 @@ static inline ALvoid EAXEcho(ALreverbState *State, ALuint todo, ALfloat (*restri
State->Echo.Coeff;
// Mix the output into the late reverb channels.
out = State->Echo.MixCoeff[0] * feed;
late[i][0] = (State->Echo.MixCoeff[1] * late[i][0]) + out;
late[i][1] = (State->Echo.MixCoeff[1] * late[i][1]) + out;
late[i][2] = (State->Echo.MixCoeff[1] * late[i][2]) + out;
late[i][3] = (State->Echo.MixCoeff[1] * late[i][3]) + out;
out = State->Echo.MixCoeff * feed;
late[i][0] += out;
late[i][1] += out;
late[i][2] += out;
late[i][3] += out;
// Mix the energy-attenuated input with the output and pass it through
// the echo low-pass filter.
@ -962,7 +962,7 @@ static ALvoid UpdateDecorrelator(ALfloat density, ALuint frequency, ALreverbStat
}
// Update the late reverb gains, line lengths, and line coefficients.
static ALvoid UpdateLateLines(ALfloat reverbGain, ALfloat lateGain, ALfloat xMix, ALfloat density, ALfloat decayTime, ALfloat diffusion, ALfloat hfRatio, ALfloat cw, ALuint frequency, ALreverbState *State)
static ALvoid UpdateLateLines(ALfloat reverbGain, ALfloat lateGain, ALfloat xMix, ALfloat density, ALfloat decayTime, ALfloat diffusion, ALfloat echoDepth, ALfloat hfRatio, ALfloat cw, ALuint frequency, ALreverbState *State)
{
ALfloat length;
ALuint index;
@ -970,9 +970,13 @@ static ALvoid UpdateLateLines(ALfloat reverbGain, ALfloat lateGain, ALfloat xMix
/* 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 next delay line coefficients, this gain needs to be
* attenuated by the 'x' mixing matrix coefficient as well.
* attenuated by the 'x' mixing matrix coefficient as well. Also attenuate
* the late reverb when echo depth is high and diffusion is low, so the
* echo is slightly stronger than the decorrelated echos in the reverb
* tail.
*/
State->Late.Gain = reverbGain * lateGain * xMix;
State->Late.Gain = reverbGain * lateGain * xMix *
(1.0f - (echoDepth*0.5f*(1.0f - diffusion)));
/* To compensate for changes in modal density and decay time of the late
* reverb signal, the input is attenuated based on the maximal energy of
@ -985,8 +989,9 @@ static ALvoid UpdateLateLines(ALfloat reverbGain, ALfloat lateGain, ALfloat xMix
length = (LATE_LINE_LENGTH[0] + LATE_LINE_LENGTH[1] +
LATE_LINE_LENGTH[2] + LATE_LINE_LENGTH[3]) / 4.0f;
length *= 1.0f + (density * LATE_LINE_MULTIPLIER);
State->Late.DensityGain = CalcDensityGain(CalcDecayCoeff(length,
decayTime));
State->Late.DensityGain = CalcDensityGain(
CalcDecayCoeff(length, decayTime)
);
// Calculate the all-pass feed-back and feed-forward coefficient.
State->Late.ApFeedCoeff = 0.5f * powf(diffusion, 2.0f);
@ -994,12 +999,13 @@ static ALvoid UpdateLateLines(ALfloat reverbGain, ALfloat lateGain, ALfloat xMix
for(index = 0;index < 4;index++)
{
// Calculate the gain (coefficient) for each all-pass line.
State->Late.ApCoeff[index] = CalcDecayCoeff(ALLPASS_LINE_LENGTH[index],
decayTime);
State->Late.ApCoeff[index] = CalcDecayCoeff(
ALLPASS_LINE_LENGTH[index], decayTime
);
// Calculate the length (in seconds) of each cyclical delay line.
length = LATE_LINE_LENGTH[index] * (1.0f + (density *
LATE_LINE_MULTIPLIER));
length = LATE_LINE_LENGTH[index] *
(1.0f + (density * LATE_LINE_MULTIPLIER));
// Calculate the delay offset for each cyclical delay line.
State->Late.Offset[index] = fastf2u(length * frequency);
@ -1008,9 +1014,9 @@ static ALvoid UpdateLateLines(ALfloat reverbGain, ALfloat lateGain, ALfloat xMix
State->Late.Coeff[index] = CalcDecayCoeff(length, decayTime);
// Calculate the damping coefficient for each low-pass filter.
State->Late.LpCoeff[index] =
CalcDampingCoeff(hfRatio, length, decayTime,
State->Late.Coeff[index], cw);
State->Late.LpCoeff[index] = CalcDampingCoeff(
hfRatio, length, decayTime, State->Late.Coeff[index], cw
);
// Attenuate the cyclical line coefficients by the mixing coefficient
// (x).
@ -1047,8 +1053,7 @@ static ALvoid UpdateEchoLine(ALfloat reverbGain, ALfloat lateGain, ALfloat echoT
* echo depth is high and diffusion is low, so the echo is slightly
* stronger than the decorrelated echos in the reverb tail.
*/
State->Echo.MixCoeff[0] = reverbGain * lateGain * echoDepth;
State->Echo.MixCoeff[1] = 1.0f - (echoDepth * 0.5f * (1.0f - diffusion));
State->Echo.MixCoeff = reverbGain * lateGain * echoDepth;
}
// Update the early and late 3D panning gains.
@ -1156,7 +1161,8 @@ static ALvoid ALreverbState_update(ALreverbState *State, ALCdevice *Device, cons
// Update the late lines.
UpdateLateLines(props->Reverb.Gain, props->Reverb.LateReverbGain, x,
props->Reverb.Density, props->Reverb.DecayTime,
props->Reverb.Diffusion, hfRatio, cw, frequency, State);
props->Reverb.Diffusion, props->Reverb.EchoDepth,
hfRatio, cw, frequency, State);
// Update the echo line.
UpdateEchoLine(props->Reverb.Gain, props->Reverb.LateReverbGain,
@ -1267,8 +1273,7 @@ static ALeffectState *ALreverbStateFactory_create(ALreverbStateFactory* UNUSED(f
state->Echo.ApOffset = 0;
state->Echo.LpCoeff = 0.0f;
state->Echo.LpSample = 0.0f;
state->Echo.MixCoeff[0] = 0.0f;
state->Echo.MixCoeff[1] = 0.0f;
state->Echo.MixCoeff = 0.0f;
state->Offset = 0;