Differential D1358 Diff 4419 extern/audaspace/src/fx/Accumulator.cpp

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extern/audaspace/src/fx/Accumulator.cpp

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				/*******************************************************************************
				* Copyright 2009-2015 Jörg Müller
				*
				* Licensed under the Apache License, Version 2.0 (the "License");
				* you may not use this file except in compliance with the License.
				* You may obtain a copy of the License at
				*
				* http://www.apache.org/licenses/LICENSE-2.0
				*
				* Unless required by applicable law or agreed to in writing, software
				* distributed under the License is distributed on an "AS IS" BASIS,
				* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
				* See the License for the specific language governing permissions and
				* limitations under the License.
				******************************************************************************/

				#include "fx/Accumulator.h"
				#include "fx/CallbackIIRFilterReader.h"

				AUD_NAMESPACE_BEGIN

				sample_t Accumulator::accumulatorFilterAdditive(CallbackIIRFilterReader* reader, void* useless)
				{
				float in = reader->x(0);
				float lastin = reader->x(-1);
				float out = reader->y(-1) + in - lastin;
				if(in > lastin)
				out += in - lastin;
				return out;
				}

				sample_t Accumulator::accumulatorFilter(CallbackIIRFilterReader* reader, void* useless)
				{
				float in = reader->x(0);
				float lastin = reader->x(-1);
				float out = reader->y(-1);
				if(in > lastin)
				out += in - lastin;
				return out;
				}

				Accumulator::Accumulator(std::shared_ptr<ISound> sound,
				bool additive) :
				Effect(sound),
				m_additive(additive)
				{
				}

				std::shared_ptr<IReader> Accumulator::createReader()
				{
				return std::shared_ptr<IReader>(new CallbackIIRFilterReader(getReader(), 2, 2, m_additive ? accumulatorFilterAdditive : accumulatorFilter));
				}

				AUD_NAMESPACE_END