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openal-soft/alc/alu.cpp
Chris Robinson 0694df9014 Handle playing and pausing with VoiceChanges
2020-02-21 04:29:32 -08:00

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/**
* OpenAL cross platform audio library
* Copyright (C) 1999-2007 by authors.
* 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 "config.h"
#include "alu.h"
#include <algorithm>
#include <array>
#include <atomic>
#include <cassert>
#include <chrono>
#include <climits>
#include <cmath>
#include <cstdarg>
#include <cstdio>
#include <cstdlib>
#include <functional>
#include <iterator>
#include <limits>
#include <memory>
#include <new>
#include <numeric>
#include <utility>
#include "AL/al.h"
#include "AL/alc.h"
#include "AL/efx.h"
#include "al/auxeffectslot.h"
#include "al/buffer.h"
#include "al/effect.h"
#include "al/event.h"
#include "al/listener.h"
#include "alcmain.h"
#include "alcontext.h"
#include "almalloc.h"
#include "alnumeric.h"
#include "alspan.h"
#include "alstring.h"
#include "ambidefs.h"
#include "atomic.h"
#include "bformatdec.h"
#include "bs2b.h"
#include "cpu_caps.h"
#include "devformat.h"
#include "effects/base.h"
#include "filters/biquad.h"
#include "filters/nfc.h"
#include "filters/splitter.h"
#include "fpu_modes.h"
#include "hrtf.h"
#include "inprogext.h"
#include "mastering.h"
#include "math_defs.h"
#include "mixer/defs.h"
#include "opthelpers.h"
#include "ringbuffer.h"
#include "strutils.h"
#include "threads.h"
#include "uhjfilter.h"
#include "vecmat.h"
#include "voice.h"
#include "bsinc_inc.h"
static_assert(!(MAX_RESAMPLER_PADDING&1) && MAX_RESAMPLER_PADDING >= bsinc24.m[0],
"MAX_RESAMPLER_PADDING is not a multiple of two, or is too small");
namespace {
using namespace std::placeholders;
ALfloat InitConeScale()
{
ALfloat ret{1.0f};
if(auto optval = al::getenv("__ALSOFT_HALF_ANGLE_CONES"))
{
if(al::strcasecmp(optval->c_str(), "true") == 0
|| strtol(optval->c_str(), nullptr, 0) == 1)
ret *= 0.5f;
}
return ret;
}
ALfloat InitZScale()
{
ALfloat ret{1.0f};
if(auto optval = al::getenv("__ALSOFT_REVERSE_Z"))
{
if(al::strcasecmp(optval->c_str(), "true") == 0
|| strtol(optval->c_str(), nullptr, 0) == 1)
ret *= -1.0f;
}
return ret;
}
} // namespace
/* Cone scalar */
const ALfloat ConeScale{InitConeScale()};
/* Localized Z scalar for mono sources */
const ALfloat ZScale{InitZScale()};
MixerFunc MixSamples{Mix_<CTag>};
RowMixerFunc MixRowSamples{MixRow_<CTag>};
namespace {
struct ChanMap {
Channel channel;
ALfloat angle;
ALfloat elevation;
};
HrtfDirectMixerFunc MixDirectHrtf = MixDirectHrtf_<CTag>;
inline MixerFunc SelectMixer()
{
#ifdef HAVE_NEON
if((CPUCapFlags&CPU_CAP_NEON))
return Mix_<NEONTag>;
#endif
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
return Mix_<SSETag>;
#endif
return Mix_<CTag>;
}
inline RowMixerFunc SelectRowMixer()
{
#ifdef HAVE_NEON
if((CPUCapFlags&CPU_CAP_NEON))
return MixRow_<NEONTag>;
#endif
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
return MixRow_<SSETag>;
#endif
return MixRow_<CTag>;
}
inline HrtfDirectMixerFunc SelectHrtfMixer(void)
{
#ifdef HAVE_NEON
if((CPUCapFlags&CPU_CAP_NEON))
return MixDirectHrtf_<NEONTag>;
#endif
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
return MixDirectHrtf_<SSETag>;
#endif
return MixDirectHrtf_<CTag>;
}
inline void BsincPrepare(const ALuint increment, BsincState *state, const BSincTable *table)
{
size_t si{BSINC_SCALE_COUNT - 1};
float sf{0.0f};
if(increment > FRACTIONONE)
{
sf = FRACTIONONE / static_cast<float>(increment);
sf = maxf(0.0f, (BSINC_SCALE_COUNT-1) * (sf-table->scaleBase) * table->scaleRange);
si = float2uint(sf);
/* The interpolation factor is fit to this diagonally-symmetric curve
* to reduce the transition ripple caused by interpolating different
* scales of the sinc function.
*/
sf = 1.0f - std::cos(std::asin(sf - static_cast<float>(si)));
}
state->sf = sf;
state->m = table->m[si];
state->l = (state->m/2) - 1;
state->filter = table->Tab + table->filterOffset[si];
}
inline ResamplerFunc SelectResampler(Resampler resampler, ALuint increment)
{
switch(resampler)
{
case Resampler::Point:
return Resample_<PointTag,CTag>;
case Resampler::Linear:
#ifdef HAVE_NEON
if((CPUCapFlags&CPU_CAP_NEON))
return Resample_<LerpTag,NEONTag>;
#endif
#ifdef HAVE_SSE4_1
if((CPUCapFlags&CPU_CAP_SSE4_1))
return Resample_<LerpTag,SSE4Tag>;
#endif
#ifdef HAVE_SSE2
if((CPUCapFlags&CPU_CAP_SSE2))
return Resample_<LerpTag,SSE2Tag>;
#endif
return Resample_<LerpTag,CTag>;
case Resampler::Cubic:
return Resample_<CubicTag,CTag>;
case Resampler::BSinc12:
case Resampler::BSinc24:
if(increment <= FRACTIONONE)
{
/* fall-through */
case Resampler::FastBSinc12:
case Resampler::FastBSinc24:
#ifdef HAVE_NEON
if((CPUCapFlags&CPU_CAP_NEON))
return Resample_<FastBSincTag,NEONTag>;
#endif
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
return Resample_<FastBSincTag,SSETag>;
#endif
return Resample_<FastBSincTag,CTag>;
}
#ifdef HAVE_NEON
if((CPUCapFlags&CPU_CAP_NEON))
return Resample_<BSincTag,NEONTag>;
#endif
#ifdef HAVE_SSE
if((CPUCapFlags&CPU_CAP_SSE))
return Resample_<BSincTag,SSETag>;
#endif
return Resample_<BSincTag,CTag>;
}
return Resample_<PointTag,CTag>;
}
} // namespace
void aluInit(void)
{
MixSamples = SelectMixer();
MixRowSamples = SelectRowMixer();
MixDirectHrtf = SelectHrtfMixer();
}
ResamplerFunc PrepareResampler(Resampler resampler, ALuint increment, InterpState *state)
{
switch(resampler)
{
case Resampler::Point:
case Resampler::Linear:
case Resampler::Cubic:
break;
case Resampler::FastBSinc12:
case Resampler::BSinc12:
BsincPrepare(increment, &state->bsinc, &bsinc12);
break;
case Resampler::FastBSinc24:
case Resampler::BSinc24:
BsincPrepare(increment, &state->bsinc, &bsinc24);
break;
}
return SelectResampler(resampler, increment);
}
void ALCdevice::ProcessHrtf(const size_t SamplesToDo)
{
/* HRTF is stereo output only. */
const ALuint lidx{RealOut.ChannelIndex[FrontLeft]};
const ALuint ridx{RealOut.ChannelIndex[FrontRight]};
MixDirectHrtf(RealOut.Buffer[lidx], RealOut.Buffer[ridx], Dry.Buffer, HrtfAccumData,
mHrtfState.get(), SamplesToDo);
}
void ALCdevice::ProcessAmbiDec(const size_t SamplesToDo)
{
AmbiDecoder->process(RealOut.Buffer, Dry.Buffer.data(), SamplesToDo);
}
void ALCdevice::ProcessUhj(const size_t SamplesToDo)
{
/* UHJ is stereo output only. */
const ALuint lidx{RealOut.ChannelIndex[FrontLeft]};
const ALuint ridx{RealOut.ChannelIndex[FrontRight]};
/* Encode to stereo-compatible 2-channel UHJ output. */
Uhj_Encoder->encode(RealOut.Buffer[lidx], RealOut.Buffer[ridx], Dry.Buffer.data(),
SamplesToDo);
}
void ALCdevice::ProcessBs2b(const size_t SamplesToDo)
{
/* First, decode the ambisonic mix to the "real" output. */
AmbiDecoder->process(RealOut.Buffer, Dry.Buffer.data(), SamplesToDo);
/* BS2B is stereo output only. */
const ALuint lidx{RealOut.ChannelIndex[FrontLeft]};
const ALuint ridx{RealOut.ChannelIndex[FrontRight]};
/* Now apply the BS2B binaural/crossfeed filter. */
bs2b_cross_feed(Bs2b.get(), RealOut.Buffer[lidx].data(), RealOut.Buffer[ridx].data(),
SamplesToDo);
}
namespace {
/* This RNG method was created based on the math found in opusdec. It's quick,
* and starting with a seed value of 22222, is suitable for generating
* whitenoise.
*/
inline ALuint dither_rng(ALuint *seed) noexcept
{
*seed = (*seed * 96314165) + 907633515;
return *seed;
}
auto GetAmbiScales(AmbiNorm scaletype) noexcept -> const std::array<float,MAX_AMBI_CHANNELS>&
{
if(scaletype == AmbiNorm::FuMa) return AmbiScale::FromFuMa;
if(scaletype == AmbiNorm::SN3D) return AmbiScale::FromSN3D;
return AmbiScale::FromN3D;
}
auto GetAmbiLayout(AmbiLayout layouttype) noexcept -> const std::array<uint8_t,MAX_AMBI_CHANNELS>&
{
if(layouttype == AmbiLayout::FuMa) return AmbiIndex::FromFuMa;
return AmbiIndex::FromACN;
}
auto GetAmbi2DLayout(AmbiLayout layouttype) noexcept -> const std::array<uint8_t,MAX_AMBI2D_CHANNELS>&
{
if(layouttype == AmbiLayout::FuMa) return AmbiIndex::FromFuMa2D;
return AmbiIndex::From2D;
}
inline alu::Vector aluCrossproduct(const alu::Vector &in1, const alu::Vector &in2)
{
return alu::Vector{
in1[1]*in2[2] - in1[2]*in2[1],
in1[2]*in2[0] - in1[0]*in2[2],
in1[0]*in2[1] - in1[1]*in2[0],
0.0f
};
}
inline ALfloat aluDotproduct(const alu::Vector &vec1, const alu::Vector &vec2)
{
return vec1[0]*vec2[0] + vec1[1]*vec2[1] + vec1[2]*vec2[2];
}
alu::Vector operator*(const alu::Matrix &mtx, const alu::Vector &vec) noexcept
{
return alu::Vector{
vec[0]*mtx[0][0] + vec[1]*mtx[1][0] + vec[2]*mtx[2][0] + vec[3]*mtx[3][0],
vec[0]*mtx[0][1] + vec[1]*mtx[1][1] + vec[2]*mtx[2][1] + vec[3]*mtx[3][1],
vec[0]*mtx[0][2] + vec[1]*mtx[1][2] + vec[2]*mtx[2][2] + vec[3]*mtx[3][2],
vec[0]*mtx[0][3] + vec[1]*mtx[1][3] + vec[2]*mtx[2][3] + vec[3]*mtx[3][3]
};
}
bool CalcContextParams(ALCcontext *Context)
{
ALcontextProps *props{Context->mUpdate.exchange(nullptr, std::memory_order_acq_rel)};
if(!props) return false;
ALlistener &Listener = Context->mListener;
Listener.Params.DopplerFactor = props->DopplerFactor;
Listener.Params.SpeedOfSound = props->SpeedOfSound * props->DopplerVelocity;
Listener.Params.SourceDistanceModel = props->SourceDistanceModel;
Listener.Params.mDistanceModel = props->mDistanceModel;
AtomicReplaceHead(Context->mFreeContextProps, props);
return true;
}
bool CalcListenerParams(ALCcontext *Context)
{
ALlistener &Listener = Context->mListener;
ALlistenerProps *props{Listener.Params.Update.exchange(nullptr, std::memory_order_acq_rel)};
if(!props) return false;
/* AT then UP */
alu::Vector N{props->OrientAt[0], props->OrientAt[1], props->OrientAt[2], 0.0f};
N.normalize();
alu::Vector V{props->OrientUp[0], props->OrientUp[1], props->OrientUp[2], 0.0f};
V.normalize();
/* Build and normalize right-vector */
alu::Vector U{aluCrossproduct(N, V)};
U.normalize();
Listener.Params.Matrix = alu::Matrix{
U[0], V[0], -N[0], 0.0f,
U[1], V[1], -N[1], 0.0f,
U[2], V[2], -N[2], 0.0f,
0.0f, 0.0f, 0.0f, 1.0f
};
const alu::Vector P{Listener.Params.Matrix *
alu::Vector{props->Position[0], props->Position[1], props->Position[2], 1.0f}};
Listener.Params.Matrix.setRow(3, -P[0], -P[1], -P[2], 1.0f);
const alu::Vector vel{props->Velocity[0], props->Velocity[1], props->Velocity[2], 0.0f};
Listener.Params.Velocity = Listener.Params.Matrix * vel;
Listener.Params.Gain = props->Gain * Context->mGainBoost;
Listener.Params.MetersPerUnit = props->MetersPerUnit;
AtomicReplaceHead(Context->mFreeListenerProps, props);
return true;
}
bool CalcEffectSlotParams(ALeffectslot *slot, ALeffectslot **sorted_slots, ALCcontext *context)
{
ALeffectslotProps *props{slot->Params.Update.exchange(nullptr, std::memory_order_acq_rel)};
if(!props) return false;
/* If the effect slot target changed, clear the first sorted entry to force
* a re-sort.
*/
if(slot->Params.Target != props->Target)
*sorted_slots = nullptr;
slot->Params.Gain = props->Gain;
slot->Params.AuxSendAuto = props->AuxSendAuto;
slot->Params.Target = props->Target;
slot->Params.EffectType = props->Type;
slot->Params.mEffectProps = props->Props;
if(IsReverbEffect(props->Type))
{
slot->Params.RoomRolloff = props->Props.Reverb.RoomRolloffFactor;
slot->Params.DecayTime = props->Props.Reverb.DecayTime;
slot->Params.DecayLFRatio = props->Props.Reverb.DecayLFRatio;
slot->Params.DecayHFRatio = props->Props.Reverb.DecayHFRatio;
slot->Params.DecayHFLimit = props->Props.Reverb.DecayHFLimit;
slot->Params.AirAbsorptionGainHF = props->Props.Reverb.AirAbsorptionGainHF;
}
else
{
slot->Params.RoomRolloff = 0.0f;
slot->Params.DecayTime = 0.0f;
slot->Params.DecayLFRatio = 0.0f;
slot->Params.DecayHFRatio = 0.0f;
slot->Params.DecayHFLimit = AL_FALSE;
slot->Params.AirAbsorptionGainHF = 1.0f;
}
EffectState *state{props->State};
props->State = nullptr;
EffectState *oldstate{slot->Params.mEffectState};
slot->Params.mEffectState = state;
/* Only release the old state if it won't get deleted, since we can't be
* deleting/freeing anything in the mixer.
*/
if(!oldstate->releaseIfNoDelete())
{
/* Otherwise, if it would be deleted send it off with a release event. */
RingBuffer *ring{context->mAsyncEvents.get()};
auto evt_vec = ring->getWriteVector();
if LIKELY(evt_vec.first.len > 0)
{
AsyncEvent *evt{new (evt_vec.first.buf) AsyncEvent{EventType_ReleaseEffectState}};
evt->u.mEffectState = oldstate;
ring->writeAdvance(1);
}
else
{
/* If writing the event failed, the queue was probably full. Store
* the old state in the property object where it can eventually be
* cleaned up sometime later (not ideal, but better than blocking
* or leaking).
*/
props->State = oldstate;
}
}
AtomicReplaceHead(context->mFreeEffectslotProps, props);
EffectTarget output;
if(ALeffectslot *target{slot->Params.Target})
output = EffectTarget{&target->Wet, nullptr};
else
{
ALCdevice *device{context->mDevice.get()};
output = EffectTarget{&device->Dry, &device->RealOut};
}
state->update(context, slot, &slot->Params.mEffectProps, output);
return true;
}
/* Scales the given azimuth toward the side (+/- pi/2 radians) for positions in
* front.
*/
inline float ScaleAzimuthFront(float azimuth, float scale)
{
const ALfloat abs_azi{std::fabs(azimuth)};
if(!(abs_azi >= al::MathDefs<float>::Pi()*0.5f))
return std::copysign(minf(abs_azi*scale, al::MathDefs<float>::Pi()*0.5f), azimuth);
return azimuth;
}
/* Wraps the given value in radians to stay between [-pi,+pi] */
inline float WrapRadians(float r)
{
constexpr float Pi{al::MathDefs<float>::Pi()};
constexpr float Pi2{al::MathDefs<float>::Tau()};
if(r > Pi) return std::fmod(Pi+r, Pi2) - Pi;
if(r < -Pi) return Pi - std::fmod(Pi-r, Pi2);
return r;
}
/* Begin ambisonic rotation helpers.
*
* Rotating first-order B-Format just needs a straight-forward X/Y/Z rotation
* matrix. Higher orders, however, are more complicated. The method implemented
* here is a recursive algorithm (the rotation for first-order is used to help
* generate the second-order rotation, which helps generate the third-order
* rotation, etc).
*
* Adapted from
* <https://github.com/polarch/Spherical-Harmonic-Transform/blob/master/getSHrotMtx.m>,
* provided under the BSD 3-Clause license.
*
* Copyright (c) 2015, Archontis Politis
* Copyright (c) 2019, Christopher Robinson
*
* The u, v, and w coefficients used for generating higher-order rotations are
* precomputed since they're constant. The second-order coefficients are
* followed by the third-order coefficients, etc.
*/
struct RotatorCoeffs {
float u, v, w;
template<size_t N0, size_t N1>
static std::array<RotatorCoeffs,N0+N1> ConcatArrays(const std::array<RotatorCoeffs,N0> &lhs,
const std::array<RotatorCoeffs,N1> &rhs)
{
std::array<RotatorCoeffs,N0+N1> ret;
auto iter = std::copy(lhs.cbegin(), lhs.cend(), ret.begin());
std::copy(rhs.cbegin(), rhs.cend(), iter);
return ret;
}
template<int l, int num_elems=l*2+1>
static std::array<RotatorCoeffs,num_elems*num_elems> GenCoeffs()
{
std::array<RotatorCoeffs,num_elems*num_elems> ret{};
auto coeffs = ret.begin();
for(int m{-l};m <= l;++m)
{
for(int n{-l};n <= l;++n)
{
// compute u,v,w terms of Eq.8.1 (Table I)
const bool d{m == 0}; // the delta function d_m0
const float denom{static_cast<float>((std::abs(n) == l) ?
(2*l) * (2*l - 1) : (l*l - n*n))};
const int abs_m{std::abs(m)};
coeffs->u = std::sqrt(static_cast<float>(l*l - m*m)/denom);
coeffs->v = std::sqrt(static_cast<float>(l+abs_m-1) * static_cast<float>(l+abs_m) /
denom) * (1.0f+d) * (1.0f - 2.0f*d) * 0.5f;
coeffs->w = std::sqrt(static_cast<float>(l-abs_m-1) * static_cast<float>(l-abs_m) /
denom) * (1.0f-d) * -0.5f;
++coeffs;
}
}
return ret;
}
};
const auto RotatorCoeffArray = RotatorCoeffs::ConcatArrays(RotatorCoeffs::GenCoeffs<2>(),
RotatorCoeffs::GenCoeffs<3>());
/**
* Given the matrix, pre-filled with the (zeroth- and) first-order rotation
* coefficients, this fills in the coefficients for the higher orders up to and
* including the given order. The matrix is in ACN layout.
*/
void AmbiRotator(std::array<std::array<float,MAX_AMBI_CHANNELS>,MAX_AMBI_CHANNELS> &matrix,
const int order)
{
/* Don't do anything for < 2nd order. */
if(order < 2) return;
auto P = [](const int i, const int l, const int a, const int n, const size_t last_band,
const std::array<std::array<float,MAX_AMBI_CHANNELS>,MAX_AMBI_CHANNELS> &R)
{
const float ri1{ R[static_cast<ALuint>(i+2)][ 1+2]};
const float rim1{R[static_cast<ALuint>(i+2)][-1+2]};
const float ri0{ R[static_cast<ALuint>(i+2)][ 0+2]};
auto vec = R[static_cast<ALuint>(a+l-1) + last_band].cbegin() + last_band;
if(n == -l)
return ri1*vec[0] + rim1*vec[static_cast<ALuint>(l-1)*size_t{2}];
if(n == l)
return ri1*vec[static_cast<ALuint>(l-1)*size_t{2}] - rim1*vec[0];
return ri0*vec[static_cast<ALuint>(n+l-1)];
};
auto U = [P](const int l, const int m, const int n, const size_t last_band,
const std::array<std::array<float,MAX_AMBI_CHANNELS>,MAX_AMBI_CHANNELS> &R)
{
return P(0, l, m, n, last_band, R);
};
auto V = [P](const int l, const int m, const int n, const size_t last_band,
const std::array<std::array<float,MAX_AMBI_CHANNELS>,MAX_AMBI_CHANNELS> &R)
{
if(m > 0)
{
const bool d{m == 1};
const float p0{P( 1, l, m-1, n, last_band, R)};
const float p1{P(-1, l, -m+1, n, last_band, R)};
return d ? p0*std::sqrt(2.0f) : (p0 - p1);
}
const bool d{m == -1};
const float p0{P( 1, l, m+1, n, last_band, R)};
const float p1{P(-1, l, -m-1, n, last_band, R)};
return d ? p1*std::sqrt(2.0f) : (p0 + p1);
};
auto W = [P](const int l, const int m, const int n, const size_t last_band,
const std::array<std::array<float,MAX_AMBI_CHANNELS>,MAX_AMBI_CHANNELS> &R)
{
assert(m != 0);
if(m > 0)
{
const float p0{P( 1, l, m+1, n, last_band, R)};
const float p1{P(-1, l, -m-1, n, last_band, R)};
return p0 + p1;
}
const float p0{P( 1, l, m-1, n, last_band, R)};
const float p1{P(-1, l, -m+1, n, last_band, R)};
return p0 - p1;
};
// compute rotation matrix of each subsequent band recursively
auto coeffs = RotatorCoeffArray.cbegin();
size_t band_idx{4}, last_band{1};
for(int l{2};l <= order;++l)
{
size_t y{band_idx};
for(int m{-l};m <= l;++m,++y)
{
size_t x{band_idx};
for(int n{-l};n <= l;++n,++x)
{
float r{0.0f};
// computes Eq.8.1
const float u{coeffs->u};
if(u != 0.0f) r += u * U(l, m, n, last_band, matrix);
const float v{coeffs->v};
if(v != 0.0f) r += v * V(l, m, n, last_band, matrix);
const float w{coeffs->w};
if(w != 0.0f) r += w * W(l, m, n, last_band, matrix);
matrix[y][x] = r;
++coeffs;
}
}
last_band = band_idx;
band_idx += static_cast<ALuint>(l)*size_t{2} + 1;
}
}
/* End ambisonic rotation helpers. */
struct GainTriplet { float Base, HF, LF; };
void CalcPanningAndFilters(ALvoice *voice, const ALfloat xpos, const ALfloat ypos,
const ALfloat zpos, const ALfloat Distance, const ALfloat Spread, const GainTriplet &DryGain,
const al::span<const GainTriplet,MAX_SENDS> WetGain, ALeffectslot *(&SendSlots)[MAX_SENDS],
const ALvoicePropsBase *props, const ALlistener &Listener, const ALCdevice *Device)
{
static const ChanMap MonoMap[1]{
{ FrontCenter, 0.0f, 0.0f }
}, RearMap[2]{
{ BackLeft, Deg2Rad(-150.0f), Deg2Rad(0.0f) },
{ BackRight, Deg2Rad( 150.0f), Deg2Rad(0.0f) }
}, QuadMap[4]{
{ FrontLeft, Deg2Rad( -45.0f), Deg2Rad(0.0f) },
{ FrontRight, Deg2Rad( 45.0f), Deg2Rad(0.0f) },
{ BackLeft, Deg2Rad(-135.0f), Deg2Rad(0.0f) },
{ BackRight, Deg2Rad( 135.0f), Deg2Rad(0.0f) }
}, X51Map[6]{
{ FrontLeft, Deg2Rad( -30.0f), Deg2Rad(0.0f) },
{ FrontRight, Deg2Rad( 30.0f), Deg2Rad(0.0f) },
{ FrontCenter, Deg2Rad( 0.0f), Deg2Rad(0.0f) },
{ LFE, 0.0f, 0.0f },
{ SideLeft, Deg2Rad(-110.0f), Deg2Rad(0.0f) },
{ SideRight, Deg2Rad( 110.0f), Deg2Rad(0.0f) }
}, X61Map[7]{
{ FrontLeft, Deg2Rad(-30.0f), Deg2Rad(0.0f) },
{ FrontRight, Deg2Rad( 30.0f), Deg2Rad(0.0f) },
{ FrontCenter, Deg2Rad( 0.0f), Deg2Rad(0.0f) },
{ LFE, 0.0f, 0.0f },
{ BackCenter, Deg2Rad(180.0f), Deg2Rad(0.0f) },
{ SideLeft, Deg2Rad(-90.0f), Deg2Rad(0.0f) },
{ SideRight, Deg2Rad( 90.0f), Deg2Rad(0.0f) }
}, X71Map[8]{
{ FrontLeft, Deg2Rad( -30.0f), Deg2Rad(0.0f) },
{ FrontRight, Deg2Rad( 30.0f), Deg2Rad(0.0f) },
{ FrontCenter, Deg2Rad( 0.0f), Deg2Rad(0.0f) },
{ LFE, 0.0f, 0.0f },
{ BackLeft, Deg2Rad(-150.0f), Deg2Rad(0.0f) },
{ BackRight, Deg2Rad( 150.0f), Deg2Rad(0.0f) },
{ SideLeft, Deg2Rad( -90.0f), Deg2Rad(0.0f) },
{ SideRight, Deg2Rad( 90.0f), Deg2Rad(0.0f) }
};
ChanMap StereoMap[2]{
{ FrontLeft, Deg2Rad(-30.0f), Deg2Rad(0.0f) },
{ FrontRight, Deg2Rad( 30.0f), Deg2Rad(0.0f) }
};
const auto Frequency = static_cast<ALfloat>(Device->Frequency);
const ALuint NumSends{Device->NumAuxSends};
const ALuint num_channels{voice->mNumChannels};
ASSUME(num_channels > 0);
auto clear_target = [NumSends](ALvoice::ChannelData &chandata) -> void
{
chandata.mDryParams.Hrtf.Target = HrtfFilter{};
chandata.mDryParams.Gains.Target.fill(0.0f);
std::for_each(chandata.mWetParams.begin(), chandata.mWetParams.begin()+NumSends,
[](SendParams &params) -> void { params.Gains.Target.fill(0.0f); });
};
std::for_each(voice->mChans.begin(), voice->mChans.begin()+num_channels, clear_target);
DirectMode DirectChannels{props->DirectChannels};
const ChanMap *chans{nullptr};
ALfloat downmix_gain{1.0f};
switch(voice->mFmtChannels)
{
case FmtMono:
chans = MonoMap;
/* Mono buffers are never played direct. */
DirectChannels = DirectMode::Off;
break;
case FmtStereo:
if(DirectChannels == DirectMode::Off)
{
/* Convert counter-clockwise to clock-wise, and wrap between
* [-pi,+pi].
*/
StereoMap[0].angle = WrapRadians(-props->StereoPan[0]);
StereoMap[1].angle = WrapRadians(-props->StereoPan[1]);
}
chans = StereoMap;
downmix_gain = 1.0f / 2.0f;
break;
case FmtRear:
chans = RearMap;
downmix_gain = 1.0f / 2.0f;
break;
case FmtQuad:
chans = QuadMap;
downmix_gain = 1.0f / 4.0f;
break;
case FmtX51:
chans = X51Map;
/* NOTE: Excludes LFE. */
downmix_gain = 1.0f / 5.0f;
break;
case FmtX61:
chans = X61Map;
/* NOTE: Excludes LFE. */
downmix_gain = 1.0f / 6.0f;
break;
case FmtX71:
chans = X71Map;
/* NOTE: Excludes LFE. */
downmix_gain = 1.0f / 7.0f;
break;
case FmtBFormat2D:
case FmtBFormat3D:
DirectChannels = DirectMode::Off;
break;
}
voice->mFlags &= ~(VOICE_HAS_HRTF | VOICE_HAS_NFC);
if(voice->mFmtChannels == FmtBFormat2D || voice->mFmtChannels == FmtBFormat3D)
{
/* Special handling for B-Format sources. */
if(Distance > std::numeric_limits<float>::epsilon())
{
/* Panning a B-Format sound toward some direction is easy. Just pan
* the first (W) channel as a normal mono sound and silence the
* others.
*/
if(Device->AvgSpeakerDist > 0.0f)
{
/* Clamp the distance for really close sources, to prevent
* excessive bass.
*/
const ALfloat mdist{maxf(Distance, Device->AvgSpeakerDist/4.0f)};
const ALfloat w0{SPEEDOFSOUNDMETRESPERSEC / (mdist * Frequency)};
/* Only need to adjust the first channel of a B-Format source. */
voice->mChans[0].mDryParams.NFCtrlFilter.adjust(w0);
voice->mFlags |= VOICE_HAS_NFC;
}
ALfloat coeffs[MAX_AMBI_CHANNELS];
if(Device->mRenderMode != StereoPair)
CalcDirectionCoeffs({xpos, ypos, zpos}, Spread, coeffs);
else
{
/* Clamp Y, in case rounding errors caused it to end up outside
* of -1...+1.
*/
const ALfloat ev{std::asin(clampf(ypos, -1.0f, 1.0f))};
/* Negate Z for right-handed coords with -Z in front. */
const ALfloat az{std::atan2(xpos, -zpos)};
/* A scalar of 1.5 for plain stereo results in +/-60 degrees
* being moved to +/-90 degrees for direct right and left
* speaker responses.
*/
CalcAngleCoeffs(ScaleAzimuthFront(az, 1.5f), ev, Spread, coeffs);
}
/* NOTE: W needs to be scaled according to channel scaling. */
const float scale0{GetAmbiScales(voice->mAmbiScaling)[0]};
ComputePanGains(&Device->Dry, coeffs, DryGain.Base*scale0,
voice->mChans[0].mDryParams.Gains.Target);
for(ALuint i{0};i < NumSends;i++)
{
if(const ALeffectslot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs, WetGain[i].Base*scale0,
voice->mChans[0].mWetParams[i].Gains.Target);
}
}
else
{
if(Device->AvgSpeakerDist > 0.0f)
{
/* NOTE: The NFCtrlFilters were created with a w0 of 0, which
* is what we want for FOA input. The first channel may have
* been previously re-adjusted if panned, so reset it.
*/
voice->mChans[0].mDryParams.NFCtrlFilter.adjust(0.0f);
voice->mFlags |= VOICE_HAS_NFC;
}
/* Local B-Format sources have their XYZ channels rotated according
* to the orientation.
*/
/* AT then UP */
alu::Vector N{props->OrientAt[0], props->OrientAt[1], props->OrientAt[2], 0.0f};
N.normalize();
alu::Vector V{props->OrientUp[0], props->OrientUp[1], props->OrientUp[2], 0.0f};
V.normalize();
if(!props->HeadRelative)
{
N = Listener.Params.Matrix * N;
V = Listener.Params.Matrix * V;
}
/* Build and normalize right-vector */
alu::Vector U{aluCrossproduct(N, V)};
U.normalize();
/* Build a rotation matrix. Manually fill the zeroth- and first-
* order elements, then construct the rotation for the higher
* orders.
*/
std::array<std::array<float,MAX_AMBI_CHANNELS>,MAX_AMBI_CHANNELS> shrot{};
shrot[0][0] = 1.0f;
shrot[1][1] = U[0]; shrot[1][2] = -V[0]; shrot[1][3] = -N[0];
shrot[2][1] = -U[1]; shrot[2][2] = V[1]; shrot[2][3] = N[1];
shrot[3][1] = U[2]; shrot[3][2] = -V[2]; shrot[3][3] = -N[2];
AmbiRotator(shrot, static_cast<int>(minu(voice->mAmbiOrder, Device->mAmbiOrder)));
/* Convert the rotation matrix for input ordering and scaling, and
* whether input is 2D or 3D.
*/
const uint8_t *index_map{(voice->mFmtChannels == FmtBFormat2D) ?
GetAmbi2DLayout(voice->mAmbiLayout).data() :
GetAmbiLayout(voice->mAmbiLayout).data()};
const float *scales{GetAmbiScales(voice->mAmbiScaling).data()};
static const uint8_t ChansPerOrder[MAX_AMBI_ORDER+1]{1, 3, 5, 7,};
static const uint8_t OrderOffset[MAX_AMBI_ORDER+1]{0, 1, 4, 9,};
for(ALuint c{0};c < num_channels;c++)
{
const size_t acn{index_map[c]};
const size_t order{AmbiIndex::OrderFromChannel[acn]};
const size_t tocopy{ChansPerOrder[order]};
const size_t offset{OrderOffset[order]};
const float scale{scales[acn]};
auto in = shrot.cbegin() + offset;
float coeffs[MAX_AMBI_CHANNELS]{};
for(size_t x{0};x < tocopy;++x)
coeffs[offset+x] = in[x][acn] * scale;
ComputePanGains(&Device->Dry, coeffs, DryGain.Base,
voice->mChans[c].mDryParams.Gains.Target);
for(ALuint i{0};i < NumSends;i++)
{
if(const ALeffectslot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs, WetGain[i].Base,
voice->mChans[c].mWetParams[i].Gains.Target);
}
}
}
}
else if(DirectChannels != DirectMode::Off && Device->FmtChans != DevFmtAmbi3D)
{
/* Direct source channels always play local. Skip the virtual channels
* and write inputs to the matching real outputs.
*/
voice->mDirect.Buffer = Device->RealOut.Buffer;
for(ALuint c{0};c < num_channels;c++)
{
ALuint idx{GetChannelIdxByName(Device->RealOut, chans[c].channel)};
if(idx != INVALID_CHANNEL_INDEX)
voice->mChans[c].mDryParams.Gains.Target[idx] = DryGain.Base;
else if(DirectChannels == DirectMode::RemixMismatch)
{
auto match_channel = [chans,c](const InputRemixMap &map) noexcept -> bool
{ return chans[c].channel == map.channel; };
auto remap = std::find_if(Device->RealOut.RemixMap.cbegin(),
Device->RealOut.RemixMap.cend(), match_channel);
if(remap != Device->RealOut.RemixMap.cend())
for(const auto &target : remap->targets)
{
idx = GetChannelIdxByName(Device->RealOut, target.channel);
if(idx != INVALID_CHANNEL_INDEX)
voice->mChans[c].mDryParams.Gains.Target[idx] = DryGain.Base *
target.mix;
}
}
}
/* Auxiliary sends still use normal channel panning since they mix to
* B-Format, which can't channel-match.
*/
for(ALuint c{0};c < num_channels;c++)
{
ALfloat coeffs[MAX_AMBI_CHANNELS];
CalcAngleCoeffs(chans[c].angle, chans[c].elevation, 0.0f, coeffs);
for(ALuint i{0};i < NumSends;i++)
{
if(const ALeffectslot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs, WetGain[i].Base,
voice->mChans[c].mWetParams[i].Gains.Target);
}
}
}
else if(Device->mRenderMode == HrtfRender)
{
/* Full HRTF rendering. Skip the virtual channels and render to the
* real outputs.
*/
voice->mDirect.Buffer = Device->RealOut.Buffer;
if(Distance > std::numeric_limits<float>::epsilon())
{
const ALfloat ev{std::asin(clampf(ypos, -1.0f, 1.0f))};
const ALfloat az{std::atan2(xpos, -zpos)};
/* Get the HRIR coefficients and delays just once, for the given
* source direction.
*/
GetHrtfCoeffs(Device->mHrtf, ev, az, Distance, Spread,
voice->mChans[0].mDryParams.Hrtf.Target.Coeffs,
voice->mChans[0].mDryParams.Hrtf.Target.Delay);
voice->mChans[0].mDryParams.Hrtf.Target.Gain = DryGain.Base * downmix_gain;
/* Remaining channels use the same results as the first. */
for(ALuint c{1};c < num_channels;c++)
{
/* Skip LFE */
if(chans[c].channel == LFE) continue;
voice->mChans[c].mDryParams.Hrtf.Target = voice->mChans[0].mDryParams.Hrtf.Target;
}
/* Calculate the directional coefficients once, which apply to all
* input channels of the source sends.
*/
ALfloat coeffs[MAX_AMBI_CHANNELS];
CalcDirectionCoeffs({xpos, ypos, zpos}, Spread, coeffs);
for(ALuint c{0};c < num_channels;c++)
{
/* Skip LFE */
if(chans[c].channel == LFE)
continue;
for(ALuint i{0};i < NumSends;i++)
{
if(const ALeffectslot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs, WetGain[i].Base * downmix_gain,
voice->mChans[c].mWetParams[i].Gains.Target);
}
}
}
else
{
/* Local sources on HRTF play with each channel panned to its
* relative location around the listener, providing "virtual
* speaker" responses.
*/
for(ALuint c{0};c < num_channels;c++)
{
/* Skip LFE */
if(chans[c].channel == LFE)
continue;
/* Get the HRIR coefficients and delays for this channel
* position.
*/
GetHrtfCoeffs(Device->mHrtf, chans[c].elevation, chans[c].angle,
std::numeric_limits<float>::infinity(), Spread,
voice->mChans[c].mDryParams.Hrtf.Target.Coeffs,
voice->mChans[c].mDryParams.Hrtf.Target.Delay);
voice->mChans[c].mDryParams.Hrtf.Target.Gain = DryGain.Base;
/* Normal panning for auxiliary sends. */
ALfloat coeffs[MAX_AMBI_CHANNELS];
CalcAngleCoeffs(chans[c].angle, chans[c].elevation, Spread, coeffs);
for(ALuint i{0};i < NumSends;i++)
{
if(const ALeffectslot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs, WetGain[i].Base,
voice->mChans[c].mWetParams[i].Gains.Target);
}
}
}
voice->mFlags |= VOICE_HAS_HRTF;
}
else
{
/* Non-HRTF rendering. Use normal panning to the output. */
if(Distance > std::numeric_limits<float>::epsilon())
{
/* Calculate NFC filter coefficient if needed. */
if(Device->AvgSpeakerDist > 0.0f)
{
/* Clamp the distance for really close sources, to prevent
* excessive bass.
*/
const ALfloat mdist{maxf(Distance, Device->AvgSpeakerDist/4.0f)};
const ALfloat w0{SPEEDOFSOUNDMETRESPERSEC / (mdist * Frequency)};
/* Adjust NFC filters. */
for(ALuint c{0};c < num_channels;c++)
voice->mChans[c].mDryParams.NFCtrlFilter.adjust(w0);
voice->mFlags |= VOICE_HAS_NFC;
}
/* Calculate the directional coefficients once, which apply to all
* input channels.
*/
ALfloat coeffs[MAX_AMBI_CHANNELS];
if(Device->mRenderMode != StereoPair)
CalcDirectionCoeffs({xpos, ypos, zpos}, Spread, coeffs);
else
{
const ALfloat ev{std::asin(clampf(ypos, -1.0f, 1.0f))};
const ALfloat az{std::atan2(xpos, -zpos)};
CalcAngleCoeffs(ScaleAzimuthFront(az, 1.5f), ev, Spread, coeffs);
}
for(ALuint c{0};c < num_channels;c++)
{
/* Special-case LFE */
if(chans[c].channel == LFE)
{
if(Device->Dry.Buffer.data() == Device->RealOut.Buffer.data())
{
const ALuint idx{GetChannelIdxByName(Device->RealOut, chans[c].channel)};
if(idx != INVALID_CHANNEL_INDEX)
voice->mChans[c].mDryParams.Gains.Target[idx] = DryGain.Base;
}
continue;
}
ComputePanGains(&Device->Dry, coeffs, DryGain.Base * downmix_gain,
voice->mChans[c].mDryParams.Gains.Target);
for(ALuint i{0};i < NumSends;i++)
{
if(const ALeffectslot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs, WetGain[i].Base * downmix_gain,
voice->mChans[c].mWetParams[i].Gains.Target);
}
}
}
else
{
if(Device->AvgSpeakerDist > 0.0f)
{
/* If the source distance is 0, simulate a plane-wave by using
* infinite distance, which results in a w0 of 0.
*/
constexpr float w0{0.0f};
for(ALuint c{0};c < num_channels;c++)
voice->mChans[c].mDryParams.NFCtrlFilter.adjust(w0);
voice->mFlags |= VOICE_HAS_NFC;
}
for(ALuint c{0};c < num_channels;c++)
{
/* Special-case LFE */
if(chans[c].channel == LFE)
{
if(Device->Dry.Buffer.data() == Device->RealOut.Buffer.data())
{
const ALuint idx{GetChannelIdxByName(Device->RealOut, chans[c].channel)};
if(idx != INVALID_CHANNEL_INDEX)
voice->mChans[c].mDryParams.Gains.Target[idx] = DryGain.Base;
}
continue;
}
ALfloat coeffs[MAX_AMBI_CHANNELS];
CalcAngleCoeffs(
(Device->mRenderMode==StereoPair) ? ScaleAzimuthFront(chans[c].angle, 3.0f)
: chans[c].angle,
chans[c].elevation, Spread, coeffs
);
ComputePanGains(&Device->Dry, coeffs, DryGain.Base,
voice->mChans[c].mDryParams.Gains.Target);
for(ALuint i{0};i < NumSends;i++)
{
if(const ALeffectslot *Slot{SendSlots[i]})
ComputePanGains(&Slot->Wet, coeffs, WetGain[i].Base,
voice->mChans[c].mWetParams[i].Gains.Target);
}
}
}
}
{
const float hfNorm{props->Direct.HFReference / Frequency};
const float lfNorm{props->Direct.LFReference / Frequency};
voice->mDirect.FilterType = AF_None;
if(DryGain.HF != 1.0f) voice->mDirect.FilterType |= AF_LowPass;
if(DryGain.LF != 1.0f) voice->mDirect.FilterType |= AF_HighPass;
auto &lowpass = voice->mChans[0].mDryParams.LowPass;
auto &highpass = voice->mChans[0].mDryParams.HighPass;
lowpass.setParamsFromSlope(BiquadType::HighShelf, hfNorm, DryGain.HF, 1.0f);
highpass.setParamsFromSlope(BiquadType::LowShelf, lfNorm, DryGain.LF, 1.0f);
for(ALuint c{1};c < num_channels;c++)
{
voice->mChans[c].mDryParams.LowPass.copyParamsFrom(lowpass);
voice->mChans[c].mDryParams.HighPass.copyParamsFrom(highpass);
}
}
for(ALuint i{0};i < NumSends;i++)
{
const float hfNorm{props->Send[i].HFReference / Frequency};
const float lfNorm{props->Send[i].LFReference / Frequency};
voice->mSend[i].FilterType = AF_None;
if(WetGain[i].HF != 1.0f) voice->mSend[i].FilterType |= AF_LowPass;
if(WetGain[i].LF != 1.0f) voice->mSend[i].FilterType |= AF_HighPass;
auto &lowpass = voice->mChans[0].mWetParams[i].LowPass;
auto &highpass = voice->mChans[0].mWetParams[i].HighPass;
lowpass.setParamsFromSlope(BiquadType::HighShelf, hfNorm, WetGain[i].HF, 1.0f);
highpass.setParamsFromSlope(BiquadType::LowShelf, lfNorm, WetGain[i].LF, 1.0f);
for(ALuint c{1};c < num_channels;c++)
{
voice->mChans[c].mWetParams[i].LowPass.copyParamsFrom(lowpass);
voice->mChans[c].mWetParams[i].HighPass.copyParamsFrom(highpass);
}
}
}
void CalcNonAttnSourceParams(ALvoice *voice, const ALvoicePropsBase *props, const ALCcontext *ALContext)
{
const ALCdevice *Device{ALContext->mDevice.get()};
ALeffectslot *SendSlots[MAX_SENDS];
voice->mDirect.Buffer = Device->Dry.Buffer;
for(ALuint i{0};i < Device->NumAuxSends;i++)
{
SendSlots[i] = props->Send[i].Slot;
if(!SendSlots[i] && i == 0)
SendSlots[i] = ALContext->mDefaultSlot.get();
if(!SendSlots[i] || SendSlots[i]->Params.EffectType == AL_EFFECT_NULL)
{
SendSlots[i] = nullptr;
voice->mSend[i].Buffer = {};
}
else
voice->mSend[i].Buffer = SendSlots[i]->Wet.Buffer;
}
/* Calculate the stepping value */
const auto Pitch = static_cast<ALfloat>(voice->mFrequency) /
static_cast<ALfloat>(Device->Frequency) * props->Pitch;
if(Pitch > float{MAX_PITCH})
voice->mStep = MAX_PITCH<<FRACTIONBITS;
else
voice->mStep = maxu(fastf2u(Pitch * FRACTIONONE), 1);
voice->mResampler = PrepareResampler(props->mResampler, voice->mStep, &voice->mResampleState);
/* Calculate gains */
const ALlistener &Listener = ALContext->mListener;
GainTriplet DryGain;
DryGain.Base = minf(clampf(props->Gain, props->MinGain, props->MaxGain) * props->Direct.Gain *
Listener.Params.Gain, GAIN_MIX_MAX);
DryGain.HF = props->Direct.GainHF;
DryGain.LF = props->Direct.GainLF;
GainTriplet WetGain[MAX_SENDS];
for(ALuint i{0};i < Device->NumAuxSends;i++)
{
WetGain[i].Base = minf(clampf(props->Gain, props->MinGain, props->MaxGain) *
props->Send[i].Gain * Listener.Params.Gain, GAIN_MIX_MAX);
WetGain[i].HF = props->Send[i].GainHF;
WetGain[i].LF = props->Send[i].GainLF;
}
CalcPanningAndFilters(voice, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, DryGain, WetGain, SendSlots, props,
Listener, Device);
}
void CalcAttnSourceParams(ALvoice *voice, const ALvoicePropsBase *props, const ALCcontext *ALContext)
{
const ALCdevice *Device{ALContext->mDevice.get()};
const ALuint NumSends{Device->NumAuxSends};
const ALlistener &Listener = ALContext->mListener;
/* Set mixing buffers and get send parameters. */
voice->mDirect.Buffer = Device->Dry.Buffer;
ALeffectslot *SendSlots[MAX_SENDS];
ALfloat RoomRolloff[MAX_SENDS];
GainTriplet DecayDistance[MAX_SENDS];
for(ALuint i{0};i < NumSends;i++)
{
SendSlots[i] = props->Send[i].Slot;
if(!SendSlots[i] && i == 0)
SendSlots[i] = ALContext->mDefaultSlot.get();
if(!SendSlots[i] || SendSlots[i]->Params.EffectType == AL_EFFECT_NULL)
{
SendSlots[i] = nullptr;
RoomRolloff[i] = 0.0f;
DecayDistance[i].Base = 0.0f;
DecayDistance[i].LF = 0.0f;
DecayDistance[i].HF = 0.0f;
}
else if(SendSlots[i]->Params.AuxSendAuto)
{
RoomRolloff[i] = SendSlots[i]->Params.RoomRolloff + props->RoomRolloffFactor;
/* Calculate the distances to where this effect's decay reaches
* -60dB.
*/
DecayDistance[i].Base = SendSlots[i]->Params.DecayTime * SPEEDOFSOUNDMETRESPERSEC;
DecayDistance[i].LF = DecayDistance[i].Base * SendSlots[i]->Params.DecayLFRatio;
DecayDistance[i].HF = DecayDistance[i].Base * SendSlots[i]->Params.DecayHFRatio;
if(SendSlots[i]->Params.DecayHFLimit)
{
const float airAbsorption{SendSlots[i]->Params.AirAbsorptionGainHF};
if(airAbsorption < 1.0f)
{
/* Calculate the distance to where this effect's air
* absorption reaches -60dB, and limit the effect's HF
* decay distance (so it doesn't take any longer to decay
* than the air would allow).
*/
const float absorb_dist{std::log10(REVERB_DECAY_GAIN) /
std::log10(airAbsorption)};
DecayDistance[i].HF = minf(absorb_dist, DecayDistance[i].HF);
}
}
}
else
{
/* If the slot's auxiliary send auto is off, the data sent to the
* effect slot is the same as the dry path, sans filter effects */
RoomRolloff[i] = props->RolloffFactor;
DecayDistance[i].Base = 0.0f;
DecayDistance[i].LF = 0.0f;
DecayDistance[i].HF = 0.0f;
}
if(!SendSlots[i])
voice->mSend[i].Buffer = {};
else
voice->mSend[i].Buffer = SendSlots[i]->Wet.Buffer;
}
/* Transform source to listener space (convert to head relative) */
alu::Vector Position{props->Position[0], props->Position[1], props->Position[2], 1.0f};
alu::Vector Velocity{props->Velocity[0], props->Velocity[1], props->Velocity[2], 0.0f};
alu::Vector Direction{props->Direction[0], props->Direction[1], props->Direction[2], 0.0f};
if(props->HeadRelative == AL_FALSE)
{
/* Transform source vectors */
Position = Listener.Params.Matrix * Position;
Velocity = Listener.Params.Matrix * Velocity;
Direction = Listener.Params.Matrix * Direction;
}
else
{
/* Offset the source velocity to be relative of the listener velocity */
Velocity += Listener.Params.Velocity;
}
const bool directional{Direction.normalize() > 0.0f};
alu::Vector ToSource{Position[0], Position[1], Position[2], 0.0f};
const ALfloat Distance{ToSource.normalize()};
/* Initial source gain */
GainTriplet DryGain{props->Gain, 1.0f, 1.0f};
GainTriplet WetGain[MAX_SENDS];
for(ALuint i{0};i < NumSends;i++)
WetGain[i] = DryGain;
/* Calculate distance attenuation */
float ClampedDist{Distance};
switch(Listener.Params.SourceDistanceModel ?
props->mDistanceModel : Listener.Params.mDistanceModel)
{
case DistanceModel::InverseClamped:
ClampedDist = clampf(ClampedDist, props->RefDistance, props->MaxDistance);
if(props->MaxDistance < props->RefDistance) break;
/*fall-through*/
case DistanceModel::Inverse:
if(!(props->RefDistance > 0.0f))
ClampedDist = props->RefDistance;
else
{
float dist{lerp(props->RefDistance, ClampedDist, props->RolloffFactor)};
if(dist > 0.0f) DryGain.Base *= props->RefDistance / dist;
for(ALuint i{0};i < NumSends;i++)
{
dist = lerp(props->RefDistance, ClampedDist, RoomRolloff[i]);
if(dist > 0.0f) WetGain[i].Base *= props->RefDistance / dist;
}
}
break;
case DistanceModel::LinearClamped:
ClampedDist = clampf(ClampedDist, props->RefDistance, props->MaxDistance);
if(props->MaxDistance < props->RefDistance) break;
/*fall-through*/
case DistanceModel::Linear:
if(!(props->MaxDistance != props->RefDistance))
ClampedDist = props->RefDistance;
else
{
float attn{props->RolloffFactor * (ClampedDist-props->RefDistance) /
(props->MaxDistance-props->RefDistance)};
DryGain.Base *= maxf(1.0f - attn, 0.0f);
for(ALuint i{0};i < NumSends;i++)
{
attn = RoomRolloff[i] * (ClampedDist-props->RefDistance) /
(props->MaxDistance-props->RefDistance);
WetGain[i].Base *= maxf(1.0f - attn, 0.0f);
}
}
break;
case DistanceModel::ExponentClamped:
ClampedDist = clampf(ClampedDist, props->RefDistance, props->MaxDistance);
if(props->MaxDistance < props->RefDistance) break;
/*fall-through*/
case DistanceModel::Exponent:
if(!(ClampedDist > 0.0f && props->RefDistance > 0.0f))
ClampedDist = props->RefDistance;
else
{
const float dist_ratio{ClampedDist/props->RefDistance};
DryGain.Base *= std::pow(dist_ratio, -props->RolloffFactor);
for(ALuint i{0};i < NumSends;i++)
WetGain[i].Base *= std::pow(dist_ratio, -RoomRolloff[i]);
}
break;
case DistanceModel::Disable:
ClampedDist = props->RefDistance;
break;
}
/* Calculate directional soundcones */
if(directional && props->InnerAngle < 360.0f)
{
const float Angle{Rad2Deg(std::acos(-aluDotproduct(Direction, ToSource)) *
ConeScale * 2.0f)};
float ConeGain, ConeHF;
if(!(Angle > props->InnerAngle))
{
ConeGain = 1.0f;
ConeHF = 1.0f;
}
else if(Angle < props->OuterAngle)
{
const float scale{(Angle-props->InnerAngle) / (props->OuterAngle-props->InnerAngle)};
ConeGain = lerp(1.0f, props->OuterGain, scale);
ConeHF = lerp(1.0f, props->OuterGainHF, scale);
}
else
{
ConeGain = props->OuterGain;
ConeHF = props->OuterGainHF;
}
DryGain.Base *= ConeGain;
if(props->DryGainHFAuto)
DryGain.HF *= ConeHF;
if(props->WetGainAuto)
std::for_each(std::begin(WetGain), std::begin(WetGain)+NumSends,
[ConeGain](GainTriplet &gain) noexcept -> void { gain.Base *= ConeGain; });
if(props->WetGainHFAuto)
std::for_each(std::begin(WetGain), std::begin(WetGain)+NumSends,
[ConeHF](GainTriplet &gain) noexcept -> void { gain.HF *= ConeHF; });
}
/* Apply gain and frequency filters */
DryGain.Base = minf(clampf(DryGain.Base, props->MinGain, props->MaxGain) * props->Direct.Gain *
Listener.Params.Gain, GAIN_MIX_MAX);
DryGain.HF *= props->Direct.GainHF;
DryGain.LF *= props->Direct.GainLF;
for(ALuint i{0};i < NumSends;i++)
{
WetGain[i].Base = minf(clampf(WetGain[i].Base, props->MinGain, props->MaxGain) *
props->Send[i].Gain * Listener.Params.Gain, GAIN_MIX_MAX);
WetGain[i].HF *= props->Send[i].GainHF;
WetGain[i].LF *= props->Send[i].GainLF;
}
/* Distance-based air absorption and initial send decay. */
if(ClampedDist > props->RefDistance && props->RolloffFactor > 0.0f)
{
const float meters_base{(ClampedDist-props->RefDistance) * props->RolloffFactor *
Listener.Params.MetersPerUnit};
if(props->AirAbsorptionFactor > 0.0f)
{
const float hfattn{std::pow(AIRABSORBGAINHF, meters_base*props->AirAbsorptionFactor)};
DryGain.HF *= hfattn;
std::for_each(std::begin(WetGain), std::begin(WetGain)+NumSends,
[hfattn](GainTriplet &gain) noexcept -> void { gain.HF *= hfattn; });
}
if(props->WetGainAuto)
{
/* Apply a decay-time transformation to the wet path, based on the
* source distance in meters. The initial decay of the reverb
* effect is calculated and applied to the wet path.
*/
for(ALuint i{0};i < NumSends;i++)
{
if(!(DecayDistance[i].Base > 0.0f))
continue;
const float gain{std::pow(REVERB_DECAY_GAIN, meters_base/DecayDistance[i].Base)};
WetGain[i].Base *= gain;
/* Yes, the wet path's air absorption is applied with
* WetGainAuto on, rather than WetGainHFAuto.
*/
if(gain > 0.0f)
{
float gainhf{std::pow(REVERB_DECAY_GAIN, meters_base/DecayDistance[i].HF)};
WetGain[i].HF *= minf(gainhf / gain, 1.0f);
float gainlf{std::pow(REVERB_DECAY_GAIN, meters_base/DecayDistance[i].LF)};
WetGain[i].LF *= minf(gainlf / gain, 1.0f);
}
}
}
}
/* Initial source pitch */
ALfloat Pitch{props->Pitch};
/* Calculate velocity-based doppler effect */
ALfloat DopplerFactor{props->DopplerFactor * Listener.Params.DopplerFactor};
if(DopplerFactor > 0.0f)
{
const alu::Vector &lvelocity = Listener.Params.Velocity;
ALfloat vss{aluDotproduct(Velocity, ToSource) * -DopplerFactor};
ALfloat vls{aluDotproduct(lvelocity, ToSource) * -DopplerFactor};
const ALfloat SpeedOfSound{Listener.Params.SpeedOfSound};
if(!(vls < SpeedOfSound))
{
/* Listener moving away from the source at the speed of sound.
* Sound waves can't catch it.
*/
Pitch = 0.0f;
}
else if(!(vss < SpeedOfSound))
{
/* Source moving toward the listener at the speed of sound. Sound
* waves bunch up to extreme frequencies.
*/
Pitch = std::numeric_limits<float>::infinity();
}
else
{
/* Source and listener movement is nominal. Calculate the proper
* doppler shift.
*/
Pitch *= (SpeedOfSound-vls) / (SpeedOfSound-vss);
}
}
/* Adjust pitch based on the buffer and output frequencies, and calculate
* fixed-point stepping value.
*/
Pitch *= static_cast<ALfloat>(voice->mFrequency)/static_cast<ALfloat>(Device->Frequency);
if(Pitch > float{MAX_PITCH})
voice->mStep = MAX_PITCH<<FRACTIONBITS;
else
voice->mStep = maxu(fastf2u(Pitch * FRACTIONONE), 1);
voice->mResampler = PrepareResampler(props->mResampler, voice->mStep, &voice->mResampleState);
ALfloat spread{0.0f};
if(props->Radius > Distance)
spread = al::MathDefs<float>::Tau() - Distance/props->Radius*al::MathDefs<float>::Pi();
else if(Distance > 0.0f)
spread = std::asin(props->Radius/Distance) * 2.0f;
CalcPanningAndFilters(voice, ToSource[0], ToSource[1], ToSource[2]*ZScale,
Distance*Listener.Params.MetersPerUnit, spread, DryGain, WetGain, SendSlots, props,
Listener, Device);
}
void CalcSourceParams(ALvoice *voice, ALCcontext *context, bool force)
{
ALvoiceProps *props{voice->mUpdate.exchange(nullptr, std::memory_order_acq_rel)};
if(voice->mSourceID.load(std::memory_order_relaxed) == 0)
{
/* Don't update voices that no longer have a source. But make sure any
* update struct it has is returned to the free list.
*/
if UNLIKELY(props)
AtomicReplaceHead(context->mFreeVoiceProps, props);
return;
}
if(!props && !force)
return;
if(props)
{
voice->mProps = *props;
AtomicReplaceHead(context->mFreeVoiceProps, props);
}
if((voice->mProps.DirectChannels != DirectMode::Off && voice->mFmtChannels != FmtMono
&& voice->mFmtChannels != FmtBFormat2D && voice->mFmtChannels != FmtBFormat3D)
|| voice->mProps.mSpatializeMode == SpatializeOff
|| (voice->mProps.mSpatializeMode == SpatializeAuto && voice->mFmtChannels != FmtMono))
CalcNonAttnSourceParams(voice, &voice->mProps, context);
else
CalcAttnSourceParams(voice, &voice->mProps, context);
}
void SendSourceStateEvent(ALCcontext *context, ALuint id, ALenum state)
{
RingBuffer *ring{context->mAsyncEvents.get()};
auto evt_vec = ring->getWriteVector();
if(evt_vec.first.len < 1) return;
AsyncEvent *evt{new (evt_vec.first.buf) AsyncEvent{EventType_SourceStateChange}};
evt->u.srcstate.id = id;
evt->u.srcstate.state = state;
ring->writeAdvance(1);
}
void ProcessVoiceChanges(ALCcontext *ctx)
{
VoiceChange *cur{ctx->mCurrentVoiceChange.load(std::memory_order_acquire)};
VoiceChange *next{cur->mNext.load(std::memory_order_acquire)};
if(!next) return;
const ALbitfieldSOFT enabledevt{ctx->mEnabledEvts.load(std::memory_order_acquire)};
do {
cur = next;
bool success{false};
if(cur->mState == AL_INITIAL || cur->mState == AL_STOPPED)
{
if(ALvoice *voice{cur->mVoice})
{
voice->mCurrentBuffer.store(nullptr, std::memory_order_relaxed);
voice->mLoopBuffer.store(nullptr, std::memory_order_relaxed);
voice->mSourceID.exchange(0u, std::memory_order_relaxed);
ALvoice::State oldvstate{ALvoice::Playing};
success = voice->mPlayState.compare_exchange_strong(oldvstate, ALvoice::Stopping,
std::memory_order_relaxed, std::memory_order_acquire);
voice->mPendingStop.store(false, std::memory_order_release);
}
success |= (cur->mState == AL_INITIAL);
}
else if(cur->mState == AL_PAUSED)
{
ALvoice *voice{cur->mVoice};
ALvoice::State oldvstate{ALvoice::Playing};
success = voice->mPlayState.compare_exchange_strong(oldvstate, ALvoice::Stopping,
std::memory_order_release, std::memory_order_acquire);
}
else if(cur->mState == AL_PLAYING)
{
ALvoice *voice{cur->mVoice};
voice->mPlayState.store(ALvoice::Playing, std::memory_order_release);
success = true;
}
if(success && (enabledevt&EventType_SourceStateChange) && cur->mSourceID != 0)
SendSourceStateEvent(ctx, cur->mSourceID, cur->mState);
} while((next=cur->mNext.load(std::memory_order_acquire)));
ctx->mCurrentVoiceChange.store(cur, std::memory_order_release);
}
void ProcessParamUpdates(ALCcontext *ctx, const ALeffectslotArray &slots,
const al::span<ALvoice> voices)
{
ProcessVoiceChanges(ctx);
IncrementRef(ctx->mUpdateCount);
if LIKELY(!ctx->mHoldUpdates.load(std::memory_order_acquire))
{
bool force{CalcContextParams(ctx)};
force |= CalcListenerParams(ctx);
auto sorted_slots = const_cast<ALeffectslot**>(slots.data() + slots.size());
for(ALeffectslot *slot : slots)
force |= CalcEffectSlotParams(slot, sorted_slots, ctx);
auto calc_params = [ctx,force](ALvoice &voice) -> void
{ CalcSourceParams(&voice, ctx, force); };
std::for_each(voices.begin(), voices.end(), calc_params);
}
IncrementRef(ctx->mUpdateCount);
}
void ProcessContext(ALCcontext *ctx, const ALuint SamplesToDo)
{
ASSUME(SamplesToDo > 0);
const ALeffectslotArray &auxslots = *ctx->mActiveAuxSlots.load(std::memory_order_acquire);
const al::span<ALvoice> voices{ctx->mVoices.data(), ctx->mVoices.size()};
/* Process pending propery updates for objects on the context. */
ProcessParamUpdates(ctx, auxslots, voices);
/* Clear auxiliary effect slot mixing buffers. */
std::for_each(auxslots.begin(), auxslots.end(),
[SamplesToDo](ALeffectslot *slot) -> void
{
for(auto &buffer : slot->MixBuffer)
std::fill_n(buffer.begin(), SamplesToDo, 0.0f);
});
/* Process voices that have a playing source. */
auto mix_voice = [SamplesToDo,ctx](ALvoice &voice) -> void
{
const ALvoice::State vstate{voice.mPlayState.load(std::memory_order_acquire)};
if(vstate != ALvoice::Stopped) voice.mix(vstate, ctx, SamplesToDo);
};
std::for_each(voices.begin(), voices.end(), mix_voice);
/* Process effects. */
if(const size_t num_slots{auxslots.size()})
{
auto slots = auxslots.data();
auto slots_end = slots + num_slots;
/* First sort the slots into extra storage, so that effects come before
* their effect target (or their targets' target).
*/
auto sorted_slots = const_cast<ALeffectslot**>(slots_end);
auto sorted_slots_end = sorted_slots;
if(*sorted_slots)
{
/* Skip sorting if it has already been done. */
sorted_slots_end += num_slots;
goto skip_sorting;
}
*sorted_slots_end = *slots;
++sorted_slots_end;
while(++slots != slots_end)
{
auto in_chain = [](const ALeffectslot *s1, const ALeffectslot *s2) noexcept -> bool
{
while((s1=s1->Params.Target) != nullptr) {
if(s1 == s2) return true;
}
return false;
};
/* If this effect slot targets an effect slot already in the list
* (i.e. slots outputs to something in sorted_slots), directly or
* indirectly, insert it prior to that element.
*/
auto checker = sorted_slots;
do {
if(in_chain(*slots, *checker)) break;
} while(++checker != sorted_slots_end);
checker = std::move_backward(checker, sorted_slots_end, sorted_slots_end+1);
*--checker = *slots;
++sorted_slots_end;
}
skip_sorting:
auto process_effect = [SamplesToDo](const ALeffectslot *slot) -> void
{
EffectState *state{slot->Params.mEffectState};
state->process(SamplesToDo, slot->Wet.Buffer, state->mOutTarget);
};
std::for_each(sorted_slots, sorted_slots_end, process_effect);
}
/* Signal the event handler if there are any events to read. */
RingBuffer *ring{ctx->mAsyncEvents.get()};
if(ring->readSpace() > 0)
ctx->mEventSem.post();
}
void ApplyStablizer(FrontStablizer *Stablizer, const al::span<FloatBufferLine> Buffer,
const ALuint lidx, const ALuint ridx, const ALuint cidx, const ALuint SamplesToDo)
{
ASSUME(SamplesToDo > 0);
/* Apply a delay to all channels, except the front-left and front-right, so
* they maintain correct timing.
*/
const size_t NumChannels{Buffer.size()};
for(size_t i{0u};i < NumChannels;i++)
{
if(i == lidx || i == ridx)
continue;
auto &DelayBuf = Stablizer->DelayBuf[i];
auto buffer_end = Buffer[i].begin() + SamplesToDo;
if LIKELY(SamplesToDo >= ALuint{FrontStablizer::DelayLength})
{
auto delay_end = std::rotate(Buffer[i].begin(),
buffer_end - FrontStablizer::DelayLength, buffer_end);
std::swap_ranges(Buffer[i].begin(), delay_end, std::begin(DelayBuf));
}
else
{
auto delay_start = std::swap_ranges(Buffer[i].begin(), buffer_end,
std::begin(DelayBuf));
std::rotate(std::begin(DelayBuf), delay_start, std::end(DelayBuf));
}
}
ALfloat (&lsplit)[2][BUFFERSIZE] = Stablizer->LSplit;
ALfloat (&rsplit)[2][BUFFERSIZE] = Stablizer->RSplit;
const al::span<float> tmpbuf{Stablizer->TempBuf, SamplesToDo+FrontStablizer::DelayLength};
/* This applies the band-splitter, preserving phase at the cost of some
* delay. The shorter the delay, the more error seeps into the result.
*/
auto apply_splitter = [tmpbuf,SamplesToDo](const FloatBufferLine &InBuf,
const al::span<float,FrontStablizer::DelayLength> DelayBuf, BandSplitter &Filter,
ALfloat (&splitbuf)[2][BUFFERSIZE]) -> void
{
/* Combine the input and delayed samples into a temp buffer in reverse,
* then copy the final samples into the delay buffer for next time.
* Note that the delay buffer's samples are stored backwards here.
*/
auto tmp_iter = std::reverse_copy(InBuf.cbegin(), InBuf.cbegin()+SamplesToDo,
tmpbuf.begin());
std::copy(DelayBuf.cbegin(), DelayBuf.cend(), tmp_iter);
std::copy_n(tmpbuf.cbegin(), DelayBuf.size(), DelayBuf.begin());
/* Apply an all-pass on the reversed signal, then reverse the samples
* to get the forward signal with a reversed phase shift.
*/
Filter.applyAllpass(tmpbuf);
std::reverse(tmpbuf.begin(), tmpbuf.end());
/* Now apply the band-splitter, combining its phase shift with the
* reversed phase shift, restoring the original phase on the split
* signal.
*/
Filter.process(tmpbuf.first(SamplesToDo), splitbuf[1], splitbuf[0]);
};
apply_splitter(Buffer[lidx], Stablizer->DelayBuf[lidx], Stablizer->LFilter, lsplit);
apply_splitter(Buffer[ridx], Stablizer->DelayBuf[ridx], Stablizer->RFilter, rsplit);
for(ALuint i{0};i < SamplesToDo;i++)
{
ALfloat lfsum{lsplit[0][i] + rsplit[0][i]};
ALfloat hfsum{lsplit[1][i] + rsplit[1][i]};
ALfloat s{lsplit[0][i] + lsplit[1][i] - rsplit[0][i] - rsplit[1][i]};
/* This pans the separate low- and high-frequency sums between being on
* the center channel and the left/right channels. The low-frequency
* sum is 1/3rd toward center (2/3rds on left/right) and the high-
* frequency sum is 1/4th toward center (3/4ths on left/right). These
* values can be tweaked.
*/
ALfloat m{lfsum*std::cos(1.0f/3.0f * (al::MathDefs<float>::Pi()*0.5f)) +
hfsum*std::cos(1.0f/4.0f * (al::MathDefs<float>::Pi()*0.5f))};
ALfloat c{lfsum*std::sin(1.0f/3.0f * (al::MathDefs<float>::Pi()*0.5f)) +
hfsum*std::sin(1.0f/4.0f * (al::MathDefs<float>::Pi()*0.5f))};
/* The generated center channel signal adds to the existing signal,
* while the modified left and right channels replace.
*/
Buffer[lidx][i] = (m + s) * 0.5f;
Buffer[ridx][i] = (m - s) * 0.5f;
Buffer[cidx][i] += c * 0.5f;
}
}
void ApplyDistanceComp(const al::span<FloatBufferLine> Samples, const ALuint SamplesToDo,
const DistanceComp::DistData *distcomp)
{
ASSUME(SamplesToDo > 0);
for(auto &chanbuffer : Samples)
{
const ALfloat gain{distcomp->Gain};
const ALuint base{distcomp->Length};
ALfloat *distbuf{al::assume_aligned<16>(distcomp->Buffer)};
++distcomp;
if(base < 1)
continue;
ALfloat *inout{al::assume_aligned<16>(chanbuffer.data())};
auto inout_end = inout + SamplesToDo;
if LIKELY(SamplesToDo >= base)
{
auto delay_end = std::rotate(inout, inout_end - base, inout_end);
std::swap_ranges(inout, delay_end, distbuf);
}
else
{
auto delay_start = std::swap_ranges(inout, inout_end, distbuf);
std::rotate(distbuf, delay_start, distbuf + base);
}
std::transform(inout, inout_end, inout, std::bind(std::multiplies<float>{}, _1, gain));
}
}
void ApplyDither(const al::span<FloatBufferLine> Samples, ALuint *dither_seed,
const ALfloat quant_scale, const ALuint SamplesToDo)
{
/* Dithering. Generate whitenoise (uniform distribution of random values
* between -1 and +1) and add it to the sample values, after scaling up to
* the desired quantization depth amd before rounding.
*/
const ALfloat invscale{1.0f / quant_scale};
ALuint seed{*dither_seed};
auto dither_channel = [&seed,invscale,quant_scale,SamplesToDo](FloatBufferLine &input) -> void
{
ASSUME(SamplesToDo > 0);
auto dither_sample = [&seed,invscale,quant_scale](const ALfloat sample) noexcept -> ALfloat
{
ALfloat val{sample * quant_scale};
ALuint rng0{dither_rng(&seed)};
ALuint rng1{dither_rng(&seed)};
val += static_cast<ALfloat>(rng0*(1.0/UINT_MAX) - rng1*(1.0/UINT_MAX));
return fast_roundf(val) * invscale;
};
std::transform(input.begin(), input.begin()+SamplesToDo, input.begin(), dither_sample);
};
std::for_each(Samples.begin(), Samples.end(), dither_channel);
*dither_seed = seed;
}
/* Base template left undefined. Should be marked =delete, but Clang 3.8.1
* chokes on that given the inline specializations.
*/
template<typename T>
inline T SampleConv(float) noexcept;
template<> inline float SampleConv(float val) noexcept
{ return val; }
template<> inline int32_t SampleConv(float val) noexcept
{
/* Floats have a 23-bit mantissa, plus an implied 1 bit and a sign bit.
* This means a normalized float has at most 25 bits of signed precision.
* When scaling and clamping for a signed 32-bit integer, these following
* values are the best a float can give.
*/
return fastf2i(clampf(val*2147483648.0f, -2147483648.0f, 2147483520.0f));
}
template<> inline int16_t SampleConv(float val) noexcept
{ return static_cast<int16_t>(fastf2i(clampf(val*32768.0f, -32768.0f, 32767.0f))); }
template<> inline int8_t SampleConv(float val) noexcept
{ return static_cast<int8_t>(fastf2i(clampf(val*128.0f, -128.0f, 127.0f))); }
/* Define unsigned output variations. */
template<> inline uint32_t SampleConv(float val) noexcept
{ return static_cast<uint32_t>(SampleConv<int32_t>(val)) + 2147483648u; }
template<> inline uint16_t SampleConv(float val) noexcept
{ return static_cast<uint16_t>(SampleConv<int16_t>(val) + 32768); }
template<> inline uint8_t SampleConv(float val) noexcept
{ return static_cast<uint8_t>(SampleConv<int8_t>(val) + 128); }
template<DevFmtType T>
void Write(const al::span<const FloatBufferLine> InBuffer, void *OutBuffer, const size_t Offset,
const ALuint SamplesToDo, const size_t FrameStep)
{
using SampleType = typename DevFmtTypeTraits<T>::Type;
ASSUME(FrameStep > 0);
SampleType *outbase = static_cast<SampleType*>(OutBuffer) + Offset*FrameStep;
auto conv_channel = [&outbase,SamplesToDo,FrameStep](const FloatBufferLine &inbuf) -> void
{
ASSUME(SamplesToDo > 0);
SampleType *out{outbase++};
auto conv_sample = [FrameStep,&out](const float s) noexcept -> void
{
*out = SampleConv<SampleType>(s);
out += FrameStep;
};
std::for_each(inbuf.begin(), inbuf.begin()+SamplesToDo, conv_sample);
};
std::for_each(InBuffer.cbegin(), InBuffer.cend(), conv_channel);
}
} // namespace
void aluMixData(ALCdevice *device, void *OutBuffer, const ALuint NumSamples,
const size_t FrameStep)
{
FPUCtl mixer_mode{};
for(ALuint SamplesDone{0u};SamplesDone < NumSamples;)
{
const ALuint SamplesToDo{minu(NumSamples-SamplesDone, BUFFERSIZE)};
/* Clear main mixing buffers. */
std::for_each(device->MixBuffer.begin(), device->MixBuffer.end(),
[SamplesToDo](std::array<ALfloat,BUFFERSIZE> &buffer) -> void
{ std::fill_n(buffer.begin(), SamplesToDo, 0.0f); }
);
/* Increment the mix count at the start (lsb should now be 1). */
IncrementRef(device->MixCount);
/* For each context on this device, process and mix its sources and
* effects.
*/
for(ALCcontext *ctx : *device->mContexts.load(std::memory_order_acquire))
ProcessContext(ctx, SamplesToDo);
/* Increment the clock time. Every second's worth of samples is
* converted and added to clock base so that large sample counts don't
* overflow during conversion. This also guarantees a stable
* conversion.
*/
device->SamplesDone += SamplesToDo;
device->ClockBase += std::chrono::seconds{device->SamplesDone / device->Frequency};
device->SamplesDone %= device->Frequency;
/* Increment the mix count at the end (lsb should now be 0). */
IncrementRef(device->MixCount);
/* Apply any needed post-process for finalizing the Dry mix to the
* RealOut (Ambisonic decode, UHJ encode, etc).
*/
device->postProcess(SamplesToDo);
const al::span<FloatBufferLine> RealOut{device->RealOut.Buffer};
/* Apply front image stablization for surround sound, if applicable. */
if(FrontStablizer *stablizer{device->Stablizer.get()})
{
const ALuint lidx{GetChannelIdxByName(device->RealOut, FrontLeft)};
const ALuint ridx{GetChannelIdxByName(device->RealOut, FrontRight)};
const ALuint cidx{GetChannelIdxByName(device->RealOut, FrontCenter)};
ApplyStablizer(stablizer, RealOut, lidx, ridx, cidx, SamplesToDo);
}
/* Apply compression, limiting sample amplitude if needed or desired. */
if(Compressor *comp{device->Limiter.get()})
comp->process(SamplesToDo, RealOut.data());
/* Apply delays and attenuation for mismatched speaker distances. */
ApplyDistanceComp(RealOut, SamplesToDo, device->ChannelDelay.as_span().cbegin());
/* Apply dithering. The compressor should have left enough headroom for
* the dither noise to not saturate.
*/
if(device->DitherDepth > 0.0f)
ApplyDither(RealOut, &device->DitherSeed, device->DitherDepth, SamplesToDo);
if LIKELY(OutBuffer)
{
/* Finally, interleave and convert samples, writing to the device's
* output buffer.
*/
switch(device->FmtType)
{
#define HANDLE_WRITE(T) case T: \
Write<T>(RealOut, OutBuffer, SamplesDone, SamplesToDo, FrameStep); break;
HANDLE_WRITE(DevFmtByte)
HANDLE_WRITE(DevFmtUByte)
HANDLE_WRITE(DevFmtShort)
HANDLE_WRITE(DevFmtUShort)
HANDLE_WRITE(DevFmtInt)
HANDLE_WRITE(DevFmtUInt)
HANDLE_WRITE(DevFmtFloat)
#undef HANDLE_WRITE
}
}
SamplesDone += SamplesToDo;
}
}
void aluHandleDisconnect(ALCdevice *device, const char *msg, ...)
{
if(!device->Connected.exchange(false, std::memory_order_acq_rel))
return;
AsyncEvent evt{EventType_Disconnected};
evt.u.user.type = AL_EVENT_TYPE_DISCONNECTED_SOFT;
evt.u.user.id = 0;
evt.u.user.param = 0;
va_list args;
va_start(args, msg);
int msglen{vsnprintf(evt.u.user.msg, sizeof(evt.u.user.msg), msg, args)};
va_end(args);
if(msglen < 0 || static_cast<size_t>(msglen) >= sizeof(evt.u.user.msg))
evt.u.user.msg[sizeof(evt.u.user.msg)-1] = 0;
IncrementRef(device->MixCount);
for(ALCcontext *ctx : *device->mContexts.load())
{
const ALbitfieldSOFT enabledevt{ctx->mEnabledEvts.load(std::memory_order_acquire)};
if((enabledevt&EventType_Disconnected))
{
RingBuffer *ring{ctx->mAsyncEvents.get()};
auto evt_data = ring->getWriteVector().first;
if(evt_data.len > 0)
{
::new (evt_data.buf) AsyncEvent{evt};
ring->writeAdvance(1);
ctx->mEventSem.post();
}
}
auto stop_voice = [](ALvoice &voice) -> void
{
voice.mCurrentBuffer.store(nullptr, std::memory_order_relaxed);
voice.mLoopBuffer.store(nullptr, std::memory_order_relaxed);
voice.mSourceID.store(0u, std::memory_order_relaxed);
voice.mPlayState.store(ALvoice::Stopped, std::memory_order_release);
};
std::for_each(ctx->mVoices.begin(), ctx->mVoices.end(), stop_voice);
}
IncrementRef(device->MixCount);
}
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