Remove broken autowah effect code

It's been disabled forever, and I have no idea how to make it work properly.
Better to just redo it when making something that works.

2 files changed, 0 insertions, 278 deletions

diff --git a/Alc/ALc.c b/Alc/ALc.c
index bc6304d7..9d3553c8 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -666,13 +666,6 @@ static const ALCenums enumeration[] = {
     DECL(AL_RING_MODULATOR_HIGHPASS_CUTOFF),
     DECL(AL_RING_MODULATOR_WAVEFORM),
 
-#if 0
-    DECL(AL_AUTOWAH_ATTACK_TIME),
-    DECL(AL_AUTOWAH_PEAK_GAIN),
-    DECL(AL_AUTOWAH_RELEASE_TIME),
-    DECL(AL_AUTOWAH_RESONANCE),
-#endif
-
     DECL(AL_COMPRESSOR_ONOFF),
 
     DECL(AL_EQUALIZER_LOW_GAIN),
diff --git a/Alc/effects/autowah.c b/Alc/effects/autowah.c
deleted file mode 100644
index c8b70595..00000000
--- a/Alc/effects/autowah.c
+++ /dev/null
@@ -1,271 +0,0 @@
-/**
- * OpenAL cross platform audio library
- * Copyright (C) 2013 by Anis A. Hireche, Nasca Octavian Paul
- * This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Library General Public
- *  License as published by the Free Software Foundation; either
- *  version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- *  License along with this library; if not, write to the
- *  Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- * Or go to http://www.gnu.org/copyleft/lgpl.html
- */
-
-#include <stdlib.h>
-
-#include "config.h"
-#include "alu.h"
-#include "alFilter.h"
-#include "alError.h"
-#include "alMain.h"
-#include "alAuxEffectSlot.h"
-
-
-/* Auto-wah is simply a low-pass filter with a cutoff frequency that shifts up
- * or down depending on the input signal, and a resonant peak at the cutoff.
- *
- * Currently, we assume a cutoff frequency range of 20hz (no amplitude) to
- * 20khz (peak gain). Peak gain is assumed to be in normalized scale.
- */
-
-typedef struct ALautowahState {
-    DERIVE_FROM_TYPE(ALeffectState);
-
-    /* Effect gains for each channel */
-    ALfloat Gain[MAX_OUTPUT_CHANNELS];
-
-    /* Effect parameters */
-    ALfloat AttackRate;
-    ALfloat ReleaseRate;
-    ALfloat Resonance;
-    ALfloat PeakGain;
-    ALfloat GainCtrl;
-    ALfloat Frequency;
-
-    /* Samples processing */
-    ALfilterState LowPass;
-} ALautowahState;
-
-static ALvoid ALautowahState_Destruct(ALautowahState *state)
-{
-    ALeffectState_Destruct(STATIC_CAST(ALeffectState,state));
-}
-
-static ALboolean ALautowahState_deviceUpdate(ALautowahState *state, ALCdevice *device)
-{
-    state->Frequency = (ALfloat)device->Frequency;
-    return AL_TRUE;
-}
-
-static ALvoid ALautowahState_update(ALautowahState *state, const ALCdevice *device, const ALeffectslot *slot, const ALeffectProps *props)
-{
-    ALfloat attackTime, releaseTime;
-
-    attackTime = props->Autowah.AttackTime * state->Frequency;
-    releaseTime = props->Autowah.ReleaseTime * state->Frequency;
-
-    state->AttackRate = powf(1.0f/GAIN_SILENCE_THRESHOLD, 1.0f/attackTime);
-    state->ReleaseRate = powf(GAIN_SILENCE_THRESHOLD/1.0f, 1.0f/releaseTime);
-    state->PeakGain = props->Autowah.PeakGain;
-    state->Resonance = props->Autowah.Resonance;
-
-    ComputeAmbientGains(device->Dry, slot->Params.Gain, state->Gain);
-}
-
-static ALvoid ALautowahState_process(ALautowahState *state, ALuint SamplesToDo, const ALfloat (*restrict SamplesIn)[BUFFERSIZE], ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALuint NumChannels)
-{
-    ALuint it, kt;
-    ALuint base;
-
-    for(base = 0;base < SamplesToDo;)
-    {
-        ALfloat temps[256];
-        ALuint td = minu(256, SamplesToDo-base);
-        ALfloat gain = state->GainCtrl;
-
-        for(it = 0;it < td;it++)
-        {
-            ALfloat smp = SamplesIn[0][it+base];
-            ALfloat a[3], b[3];
-            ALfloat alpha, w0;
-            ALfloat amplitude;
-            ALfloat cutoff;
-
-            /* Similar to compressor, we get the current amplitude of the
-             * incoming signal, and attack or release to reach it. */
-            amplitude = fabsf(smp);
-            if(amplitude > gain)
-                gain = minf(gain*state->AttackRate, amplitude);
-            else if(amplitude < gain)
-                gain = maxf(gain*state->ReleaseRate, amplitude);
-            gain = maxf(gain, GAIN_SILENCE_THRESHOLD);
-
-            /* FIXME: What range does the filter cover? */
-            cutoff = lerp(20.0f, 20000.0f, minf(gain/state->PeakGain, 1.0f));
-
-            /* The code below is like calling ALfilterState_setParams with
-             * ALfilterType_LowPass. However, instead of passing a bandwidth,
-             * we use the resonance property for Q. This also inlines the call.
-             */
-            w0 = F_TAU * cutoff / state->Frequency;
-
-            /* FIXME: Resonance controls the resonant peak, or Q. How? Not sure
-             * that Q = resonance*0.1. */
-            alpha = sinf(w0) / (2.0f * state->Resonance*0.1f);
-            b[0] = (1.0f - cosf(w0)) / 2.0f;
-            b[1] =  1.0f - cosf(w0);
-            b[2] = (1.0f - cosf(w0)) / 2.0f;
-            a[0] =  1.0f + alpha;
-            a[1] = -2.0f * cosf(w0);
-            a[2] =  1.0f - alpha;
-
-            state->LowPass.a1 = a[1] / a[0];
-            state->LowPass.a2 = a[2] / a[0];
-            state->LowPass.b0 = b[0] / a[0];
-            state->LowPass.b1 = b[1] / a[0];
-            state->LowPass.b2 = b[2] / a[0];
-
-            temps[it] = ALfilterState_processSingle(&state->LowPass, smp);
-        }
-        state->GainCtrl = gain;
-
-        for(kt = 0;kt < NumChannels;kt++)
-        {
-            ALfloat gain = state->Gain[kt];
-            if(!(fabsf(gain) > GAIN_SILENCE_THRESHOLD))
-                continue;
-
-            for(it = 0;it < td;it++)
-                SamplesOut[kt][base+it] += gain * temps[it];
-        }
-
-        base += td;
-    }
-}
-
-DECLARE_DEFAULT_ALLOCATORS(ALautowahState)
-
-DEFINE_ALEFFECTSTATE_VTABLE(ALautowahState);
-
-
-typedef struct ALautowahStateFactory {
-    DERIVE_FROM_TYPE(ALeffectStateFactory);
-} ALautowahStateFactory;
-
-static ALeffectState *ALautowahStateFactory_create(ALautowahStateFactory *UNUSED(factory))
-{
-    ALautowahState *state;
-
-    state = ALautowahState_New(sizeof(*state));
-    if(!state) return NULL;
-    SET_VTABLE2(ALautowahState, ALeffectState, state);
-
-    state->AttackRate = 1.0f;
-    state->ReleaseRate = 1.0f;
-    state->Resonance = 2.0f;
-    state->PeakGain = 1.0f;
-    state->GainCtrl = 1.0f;
-
-    ALfilterState_clear(&state->LowPass);
-
-    return STATIC_CAST(ALeffectState, state);
-}
-
-DEFINE_ALEFFECTSTATEFACTORY_VTABLE(ALautowahStateFactory);
-
-ALeffectStateFactory *ALautowahStateFactory_getFactory(void)
-{
-    static ALautowahStateFactory AutowahFactory = { { GET_VTABLE2(ALautowahStateFactory, ALeffectStateFactory) } };
-
-    return STATIC_CAST(ALeffectStateFactory, &AutowahFactory);
-}
-
-
-void ALautowah_setParami(ALeffect *UNUSED(effect), ALCcontext *context, ALenum UNUSED(param), ALint UNUSED(val))
-{ SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); }
-void ALautowah_setParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals)
-{
-    ALautowah_setParami(effect, context, param, vals[0]);
-}
-void ALautowah_setParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val)
-{
-    ALeffectProps *props = &effect->Props;
-    switch(param)
-    {
-        case AL_AUTOWAH_ATTACK_TIME:
-            if(!(val >= AL_AUTOWAH_MIN_ATTACK_TIME && val <= AL_AUTOWAH_MAX_ATTACK_TIME))
-                SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
-            props->Autowah.AttackTime = val;
-            break;
-
-        case AL_AUTOWAH_RELEASE_TIME:
-            if(!(val >= AL_AUTOWAH_MIN_RELEASE_TIME && val <= AL_AUTOWAH_MAX_RELEASE_TIME))
-                SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
-            props->Autowah.ReleaseTime = val;
-            break;
-
-        case AL_AUTOWAH_RESONANCE:
-            if(!(val >= AL_AUTOWAH_MIN_RESONANCE && val <= AL_AUTOWAH_MAX_RESONANCE))
-                SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
-            props->Autowah.Resonance = val;
-            break;
-
-        case AL_AUTOWAH_PEAK_GAIN:
-            if(!(val >= AL_AUTOWAH_MIN_PEAK_GAIN && val <= AL_AUTOWAH_MAX_PEAK_GAIN))
-                SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
-            props->Autowah.PeakGain = val;
-            break;
-
-        default:
-            SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
-    }
-}
-void ALautowah_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
-{
-    ALautowah_setParamf(effect, context, param, vals[0]);
-}
-
-void ALautowah_getParami(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum UNUSED(param), ALint *UNUSED(val))
-{ SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); }
-void ALautowah_getParamiv(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals)
-{
-    ALautowah_getParami(effect, context, param, vals);
-}
-void ALautowah_getParamf(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val)
-{
-    const ALeffectProps *props = &effect->Props;
-    switch(param)
-    {
-        case AL_AUTOWAH_ATTACK_TIME:
-            *val = props->Autowah.AttackTime;
-            break;
-
-        case AL_AUTOWAH_RELEASE_TIME:
-            *val = props->Autowah.ReleaseTime;
-            break;
-
-        case AL_AUTOWAH_RESONANCE:
-            *val = props->Autowah.Resonance;
-            break;
-
-        case AL_AUTOWAH_PEAK_GAIN:
-            *val = props->Autowah.PeakGain;
-            break;
-
-        default:
-            SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
-    }
-}
-void ALautowah_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
-{
-    ALautowah_getParamf(effect, context, param, vals);
-}
-
-DEFINE_ALEFFECT_VTABLE(ALautowah);