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https://github.com/love2d/megasource.git
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Added OpenAL-Soft 1.16.0.
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rude
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/**
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 <math.h>
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#include <stdlib.h>
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#include "alMain.h"
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#include "alFilter.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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typedef struct ALmodulatorState {
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DERIVE_FROM_TYPE(ALeffectState);
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enum {
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SINUSOID,
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SAWTOOTH,
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SQUARE
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} Waveform;
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ALuint index;
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ALuint step;
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ALfloat Gain[MaxChannels];
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ALfilterState Filter;
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} ALmodulatorState;
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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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static inline ALfloat Sin(ALuint index)
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{
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return sinf(index*(F_2PI/WAVEFORM_FRACONE) - F_PI)*0.5f + 0.5f;
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}
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static inline ALfloat Saw(ALuint index)
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{
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return (ALfloat)index / WAVEFORM_FRACONE;
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}
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static inline ALfloat Square(ALuint index)
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{
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return (ALfloat)((index >> (WAVEFORM_FRACBITS - 1)) & 1);
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}
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#define DECL_TEMPLATE(func) \
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static void Process##func(ALmodulatorState *state, ALuint SamplesToDo, \
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const ALfloat *restrict SamplesIn, \
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ALfloat (*restrict SamplesOut)[BUFFERSIZE]) \
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{ \
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const ALuint step = state->step; \
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ALuint index = state->index; \
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ALuint base; \
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\
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for(base = 0;base < SamplesToDo;) \
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{ \
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ALfloat temps[64]; \
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ALuint td = minu(SamplesToDo-base, 64); \
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ALuint i, k; \
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\
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for(i = 0;i < td;i++) \
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{ \
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ALfloat samp; \
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samp = SamplesIn[base+i]; \
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samp = ALfilterState_processSingle(&state->Filter, samp); \
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\
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index += step; \
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index &= WAVEFORM_FRACMASK; \
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temps[i] = samp * func(index); \
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} \
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\
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for(k = 0;k < MaxChannels;k++) \
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{ \
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ALfloat gain = state->Gain[k]; \
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if(!(gain > GAIN_SILENCE_THRESHOLD)) \
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continue; \
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\
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for(i = 0;i < td;i++) \
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SamplesOut[k][base+i] += gain * temps[i]; \
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} \
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\
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base += td; \
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} \
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state->index = index; \
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}
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DECL_TEMPLATE(Sin)
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DECL_TEMPLATE(Saw)
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DECL_TEMPLATE(Square)
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#undef DECL_TEMPLATE
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static ALvoid ALmodulatorState_Destruct(ALmodulatorState *UNUSED(state))
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{
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}
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static ALboolean ALmodulatorState_deviceUpdate(ALmodulatorState *UNUSED(state), ALCdevice *UNUSED(device))
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{
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return AL_TRUE;
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}
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static ALvoid ALmodulatorState_update(ALmodulatorState *state, ALCdevice *Device, const ALeffectslot *Slot)
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{
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ALfloat gain, cw, a;
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if(Slot->EffectProps.Modulator.Waveform == AL_RING_MODULATOR_SINUSOID)
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state->Waveform = SINUSOID;
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else if(Slot->EffectProps.Modulator.Waveform == AL_RING_MODULATOR_SAWTOOTH)
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state->Waveform = SAWTOOTH;
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else if(Slot->EffectProps.Modulator.Waveform == AL_RING_MODULATOR_SQUARE)
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state->Waveform = SQUARE;
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state->step = fastf2u(Slot->EffectProps.Modulator.Frequency*WAVEFORM_FRACONE /
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Device->Frequency);
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if(state->step == 0) state->step = 1;
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/* Custom filter coeffs, which match the old version instead of a low-shelf. */
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cw = cosf(F_2PI * Slot->EffectProps.Modulator.HighPassCutoff / Device->Frequency);
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a = (2.0f-cw) - sqrtf(powf(2.0f-cw, 2.0f) - 1.0f);
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state->Filter.b[0] = a;
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state->Filter.b[1] = -a;
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state->Filter.b[2] = 0.0f;
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state->Filter.a[0] = 1.0f;
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state->Filter.a[1] = -a;
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state->Filter.a[2] = 0.0f;
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gain = sqrtf(1.0f/Device->NumChan) * Slot->Gain;
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SetGains(Device, gain, state->Gain);
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}
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static ALvoid ALmodulatorState_process(ALmodulatorState *state, ALuint SamplesToDo, const ALfloat *restrict SamplesIn, ALfloat (*restrict SamplesOut)[BUFFERSIZE])
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{
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switch(state->Waveform)
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{
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case SINUSOID:
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ProcessSin(state, SamplesToDo, SamplesIn, SamplesOut);
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break;
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case SAWTOOTH:
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ProcessSaw(state, SamplesToDo, SamplesIn, SamplesOut);
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break;
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case SQUARE:
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ProcessSquare(state, SamplesToDo, SamplesIn, SamplesOut);
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break;
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}
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}
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DECLARE_DEFAULT_ALLOCATORS(ALmodulatorState)
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DEFINE_ALEFFECTSTATE_VTABLE(ALmodulatorState);
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typedef struct ALmodulatorStateFactory {
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DERIVE_FROM_TYPE(ALeffectStateFactory);
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} ALmodulatorStateFactory;
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static ALeffectState *ALmodulatorStateFactory_create(ALmodulatorStateFactory *UNUSED(factory))
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{
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ALmodulatorState *state;
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state = ALmodulatorState_New(sizeof(*state));
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if(!state) return NULL;
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SET_VTABLE2(ALmodulatorState, ALeffectState, state);
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state->index = 0;
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state->step = 1;
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ALfilterState_clear(&state->Filter);
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return STATIC_CAST(ALeffectState, state);
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}
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DEFINE_ALEFFECTSTATEFACTORY_VTABLE(ALmodulatorStateFactory);
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ALeffectStateFactory *ALmodulatorStateFactory_getFactory(void)
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{
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static ALmodulatorStateFactory ModulatorFactory = { { GET_VTABLE2(ALmodulatorStateFactory, ALeffectStateFactory) } };
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return STATIC_CAST(ALeffectStateFactory, &ModulatorFactory);
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}
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void ALmodulator_setParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val)
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{
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ALeffectProps *props = &effect->Props;
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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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SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
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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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SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
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props->Modulator.HighPassCutoff = val;
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break;
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default:
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SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
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}
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}
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void ALmodulator_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
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{
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ALmodulator_setParamf(effect, context, param, vals[0]);
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}
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void ALmodulator_setParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint val)
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{
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ALeffectProps *props = &effect->Props;
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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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ALmodulator_setParamf(effect, context, param, (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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SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
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props->Modulator.Waveform = val;
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break;
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default:
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SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
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}
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}
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void ALmodulator_setParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals)
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{
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ALmodulator_setParami(effect, context, param, vals[0]);
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}
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void ALmodulator_getParami(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *val)
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{
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const ALeffectProps *props = &effect->Props;
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switch(param)
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{
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case AL_RING_MODULATOR_FREQUENCY:
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*val = (ALint)props->Modulator.Frequency;
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break;
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case AL_RING_MODULATOR_HIGHPASS_CUTOFF:
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*val = (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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SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
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}
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}
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void ALmodulator_getParamiv(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals)
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{
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ALmodulator_getParami(effect, context, param, vals);
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}
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void ALmodulator_getParamf(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val)
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{
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const ALeffectProps *props = &effect->Props;
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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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SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
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}
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}
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void ALmodulator_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
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{
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ALmodulator_getParamf(effect, context, param, vals);
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}
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DEFINE_ALEFFECT_VTABLE(ALmodulator);
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