🛠️🐜 Antkeeper superbuild with dependencies included
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283 lines
9.5 KiB
283 lines
9.5 KiB
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2009 by Chris Robinson.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <cmath>
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#include <cstdlib>
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#include <cmath>
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#include <algorithm>
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#include "alMain.h"
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#include "alcontext.h"
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#include "alAuxEffectSlot.h"
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#include "alError.h"
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#include "alu.h"
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#include "filters/biquad.h"
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#include "vecmat.h"
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namespace {
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#define MAX_UPDATE_SAMPLES 128
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#define WAVEFORM_FRACBITS 24
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#define WAVEFORM_FRACONE (1<<WAVEFORM_FRACBITS)
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#define WAVEFORM_FRACMASK (WAVEFORM_FRACONE-1)
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inline ALfloat Sin(ALsizei index)
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{
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return std::sin(static_cast<ALfloat>(index) *
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(al::MathDefs<float>::Tau() / ALfloat{WAVEFORM_FRACONE}));
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}
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inline ALfloat Saw(ALsizei index)
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{
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return static_cast<ALfloat>(index)*(2.0f/WAVEFORM_FRACONE) - 1.0f;
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}
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inline ALfloat Square(ALsizei index)
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{
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return static_cast<ALfloat>(((index>>(WAVEFORM_FRACBITS-2))&2) - 1);
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}
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inline ALfloat One(ALsizei UNUSED(index))
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{
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return 1.0f;
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}
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template<ALfloat func(ALsizei)>
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void Modulate(ALfloat *RESTRICT dst, ALsizei index, const ALsizei step, ALsizei todo)
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{
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ALsizei i;
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for(i = 0;i < todo;i++)
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{
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index += step;
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index &= WAVEFORM_FRACMASK;
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dst[i] = func(index);
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}
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}
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struct ModulatorState final : public EffectState {
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void (*mGetSamples)(ALfloat*RESTRICT, ALsizei, const ALsizei, ALsizei){};
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ALsizei mIndex{0};
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ALsizei mStep{1};
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struct {
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BiquadFilter Filter;
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ALfloat CurrentGains[MAX_OUTPUT_CHANNELS]{};
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ALfloat TargetGains[MAX_OUTPUT_CHANNELS]{};
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} mChans[MAX_AMBI_CHANNELS];
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ALboolean deviceUpdate(const ALCdevice *device) override;
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void update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) override;
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void process(ALsizei samplesToDo, const ALfloat (*RESTRICT samplesIn)[BUFFERSIZE], const ALsizei numInput, ALfloat (*RESTRICT samplesOut)[BUFFERSIZE], const ALsizei numOutput) override;
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DEF_NEWDEL(ModulatorState)
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};
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ALboolean ModulatorState::deviceUpdate(const ALCdevice *UNUSED(device))
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{
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for(auto &e : mChans)
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{
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e.Filter.clear();
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std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
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}
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return AL_TRUE;
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}
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void ModulatorState::update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target)
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{
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const ALCdevice *device{context->Device};
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const float step{props->Modulator.Frequency / static_cast<ALfloat>(device->Frequency)};
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mStep = fastf2i(clampf(step*WAVEFORM_FRACONE, 0.0f, ALfloat{WAVEFORM_FRACONE-1}));
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if(mStep == 0)
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mGetSamples = Modulate<One>;
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else if(props->Modulator.Waveform == AL_RING_MODULATOR_SINUSOID)
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mGetSamples = Modulate<Sin>;
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else if(props->Modulator.Waveform == AL_RING_MODULATOR_SAWTOOTH)
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mGetSamples = Modulate<Saw>;
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else /*if(Slot->Params.EffectProps.Modulator.Waveform == AL_RING_MODULATOR_SQUARE)*/
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mGetSamples = Modulate<Square>;
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ALfloat f0norm{props->Modulator.HighPassCutoff / static_cast<ALfloat>(device->Frequency)};
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f0norm = clampf(f0norm, 1.0f/512.0f, 0.49f);
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/* Bandwidth value is constant in octaves. */
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mChans[0].Filter.setParams(BiquadType::HighPass, 1.0f, f0norm,
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calc_rcpQ_from_bandwidth(f0norm, 0.75f));
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for(ALsizei i{1};i < slot->Wet.NumChannels;++i)
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mChans[i].Filter.copyParamsFrom(mChans[0].Filter);
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mOutBuffer = target.Main->Buffer;
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mOutChannels = target.Main->NumChannels;
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for(ALsizei i{0};i < slot->Wet.NumChannels;++i)
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{
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auto coeffs = GetAmbiIdentityRow(i);
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ComputePanGains(target.Main, coeffs.data(), slot->Params.Gain, mChans[i].TargetGains);
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}
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}
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void ModulatorState::process(ALsizei samplesToDo, const ALfloat (*RESTRICT samplesIn)[BUFFERSIZE], const ALsizei numInput, ALfloat (*RESTRICT samplesOut)[BUFFERSIZE], const ALsizei numOutput)
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{
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const ALsizei step = mStep;
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ALsizei base;
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for(base = 0;base < samplesToDo;)
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{
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alignas(16) ALfloat modsamples[MAX_UPDATE_SAMPLES];
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ALsizei td = mini(MAX_UPDATE_SAMPLES, samplesToDo-base);
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ALsizei c, i;
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mGetSamples(modsamples, mIndex, step, td);
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mIndex += (step*td) & WAVEFORM_FRACMASK;
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mIndex &= WAVEFORM_FRACMASK;
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ASSUME(numInput > 0);
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for(c = 0;c < numInput;c++)
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{
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alignas(16) ALfloat temps[MAX_UPDATE_SAMPLES];
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mChans[c].Filter.process(temps, &samplesIn[c][base], td);
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for(i = 0;i < td;i++)
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temps[i] *= modsamples[i];
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MixSamples(temps, numOutput, samplesOut, mChans[c].CurrentGains,
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mChans[c].TargetGains, samplesToDo-base, base, td);
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}
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base += td;
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}
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}
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void Modulator_setParamf(EffectProps *props, ALCcontext *context, ALenum param, ALfloat val)
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{
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switch(param)
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{
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case AL_RING_MODULATOR_FREQUENCY:
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if(!(val >= AL_RING_MODULATOR_MIN_FREQUENCY && val <= AL_RING_MODULATOR_MAX_FREQUENCY))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Modulator frequency out of range");
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props->Modulator.Frequency = val;
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break;
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case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
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if(!(val >= AL_RING_MODULATOR_MIN_HIGHPASS_CUTOFF && val <= AL_RING_MODULATOR_MAX_HIGHPASS_CUTOFF))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Modulator high-pass cutoff out of range");
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props->Modulator.HighPassCutoff = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid modulator float property 0x%04x", param);
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}
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}
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void Modulator_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals)
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{ Modulator_setParamf(props, context, param, vals[0]); }
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void Modulator_setParami(EffectProps *props, ALCcontext *context, ALenum param, ALint val)
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{
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switch(param)
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{
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case AL_RING_MODULATOR_FREQUENCY:
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case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
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Modulator_setParamf(props, context, param, static_cast<ALfloat>(val));
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break;
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case AL_RING_MODULATOR_WAVEFORM:
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if(!(val >= AL_RING_MODULATOR_MIN_WAVEFORM && val <= AL_RING_MODULATOR_MAX_WAVEFORM))
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SETERR_RETURN(context, AL_INVALID_VALUE,, "Invalid modulator waveform");
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props->Modulator.Waveform = val;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid modulator integer property 0x%04x", param);
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}
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}
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void Modulator_setParamiv(EffectProps *props, ALCcontext *context, ALenum param, const ALint *vals)
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{ Modulator_setParami(props, context, param, vals[0]); }
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void Modulator_getParami(const EffectProps *props, ALCcontext *context, ALenum param, ALint *val)
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{
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switch(param)
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{
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case AL_RING_MODULATOR_FREQUENCY:
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*val = static_cast<ALint>(props->Modulator.Frequency);
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break;
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case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
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*val = static_cast<ALint>(props->Modulator.HighPassCutoff);
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break;
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case AL_RING_MODULATOR_WAVEFORM:
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*val = props->Modulator.Waveform;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid modulator integer property 0x%04x", param);
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}
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}
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void Modulator_getParamiv(const EffectProps *props, ALCcontext *context, ALenum param, ALint *vals)
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{ Modulator_getParami(props, context, param, vals); }
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void Modulator_getParamf(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *val)
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{
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switch(param)
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{
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case AL_RING_MODULATOR_FREQUENCY:
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*val = props->Modulator.Frequency;
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break;
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case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
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*val = props->Modulator.HighPassCutoff;
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break;
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default:
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alSetError(context, AL_INVALID_ENUM, "Invalid modulator float property 0x%04x", param);
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}
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}
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void Modulator_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals)
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{ Modulator_getParamf(props, context, param, vals); }
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DEFINE_ALEFFECT_VTABLE(Modulator);
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struct ModulatorStateFactory final : public EffectStateFactory {
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EffectState *create() override { return new ModulatorState{}; }
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EffectProps getDefaultProps() const noexcept override;
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const EffectVtable *getEffectVtable() const noexcept override { return &Modulator_vtable; }
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};
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EffectProps ModulatorStateFactory::getDefaultProps() const noexcept
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{
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EffectProps props{};
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props.Modulator.Frequency = AL_RING_MODULATOR_DEFAULT_FREQUENCY;
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props.Modulator.HighPassCutoff = AL_RING_MODULATOR_DEFAULT_HIGHPASS_CUTOFF;
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props.Modulator.Waveform = AL_RING_MODULATOR_DEFAULT_WAVEFORM;
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return props;
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}
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} // namespace
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EffectStateFactory *ModulatorStateFactory_getFactory()
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{
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static ModulatorStateFactory ModulatorFactory{};
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return &ModulatorFactory;
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}
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