110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2011 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 <cstdlib>
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#include <cmath>
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#include <algorithm>
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#include "al/auxeffectslot.h"
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#include "alcmain.h"
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#include "alcontext.h"
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#include "alu.h"
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namespace {
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struct DedicatedState final : public EffectState {
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float mCurrentGains[MAX_OUTPUT_CHANNELS];
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float mTargetGains[MAX_OUTPUT_CHANNELS];
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void deviceUpdate(const ALCdevice *device) override;
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void update(const ALCcontext *context, const EffectSlot *slot, const EffectProps *props,
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const EffectTarget target) override;
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void process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn,
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const al::span<FloatBufferLine> samplesOut) override;
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DEF_NEWDEL(DedicatedState)
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};
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void DedicatedState::deviceUpdate(const ALCdevice*)
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{
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std::fill(std::begin(mCurrentGains), std::end(mCurrentGains), 0.0f);
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}
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void DedicatedState::update(const ALCcontext*, const EffectSlot *slot,
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const EffectProps *props, const EffectTarget target)
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{
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std::fill(std::begin(mTargetGains), std::end(mTargetGains), 0.0f);
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const float Gain{slot->Gain * props->Dedicated.Gain};
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if(slot->EffectType == AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT)
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{
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const ALuint idx{!target.RealOut ? INVALID_CHANNEL_INDEX :
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GetChannelIdxByName(*target.RealOut, LFE)};
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if(idx != INVALID_CHANNEL_INDEX)
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{
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mOutTarget = target.RealOut->Buffer;
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mTargetGains[idx] = Gain;
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}
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}
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else if(slot->EffectType == AL_EFFECT_DEDICATED_DIALOGUE)
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{
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/* Dialog goes to the front-center speaker if it exists, otherwise it
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* plays from the front-center location. */
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const ALuint idx{!target.RealOut ? INVALID_CHANNEL_INDEX :
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GetChannelIdxByName(*target.RealOut, FrontCenter)};
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if(idx != INVALID_CHANNEL_INDEX)
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{
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mOutTarget = target.RealOut->Buffer;
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mTargetGains[idx] = Gain;
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}
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else
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{
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const auto coeffs = CalcDirectionCoeffs({0.0f, 0.0f, -1.0f}, 0.0f);
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mOutTarget = target.Main->Buffer;
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ComputePanGains(target.Main, coeffs.data(), Gain, mTargetGains);
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}
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}
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}
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void DedicatedState::process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn, const al::span<FloatBufferLine> samplesOut)
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{
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MixSamples({samplesIn[0].data(), samplesToDo}, samplesOut, mCurrentGains, mTargetGains,
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samplesToDo, 0);
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}
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struct DedicatedStateFactory final : public EffectStateFactory {
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EffectState *create() override { return new DedicatedState{}; }
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};
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} // namespace
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EffectStateFactory *DedicatedStateFactory_getFactory()
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{
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static DedicatedStateFactory DedicatedFactory{};
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return &DedicatedFactory;
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}
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