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/*
* Copyright 1997 Phil Burk, Mobileer Inc
*
* 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.
*/
package com.jsyn.unitgen;
import com.jsyn.ports.UnitInputPort;
import com.jsyn.ports.UnitOutputPort;
/**
* FourWayFade unit.
* <P>
* Mix inputs 0-3 based on the value of two fade ports. You can think of the four inputs arranged
* clockwise as follows.
* <P>
*
* <PRE>
* input[0] ---- input[1]
* | |
* | |
* | |
* input[3] ---- input[2]
* </PRE>
*
* The "fade" port has two parts. Fade[0] fades between the pair of inputs (0&3) and the pair of
* inputs (1&2). Fade[1] fades between the pair of inputs (0&1) and the pair of inputs (3&2).
*
* <PRE>
* Fade[0] Fade[1] Output
* -1 -1 Input[3]
* -1 +1 Input[0]
* +1 -1 Input[2]
* +1 +1 Input[1]
*
*
* -----Fade[0]----->
*
* A
* |
* |
* Fade[1]
* |
* |
* </PRE>
* <P>
*
* @author (C) 1997-2009 Phil Burk, Mobileer Inc
*/
public class FourWayFade extends UnitGenerator {
public UnitInputPort input;
public UnitInputPort fade;
public UnitOutputPort output;
/* Define Unit Ports used by connect() and set(). */
public FourWayFade() {
addPort(input = new UnitInputPort(4, "Input"));
addPort(fade = new UnitInputPort(2, "Fade"));
addPort(output = new UnitOutputPort());
}
@Override
public void generate(int start, int limit) {
double[] inputAs = input.getValues(0);
double[] inputBs = input.getValues(1);
double[] inputCs = input.getValues(2);
double[] inputDs = input.getValues(3);
double[] fadeLRs = fade.getValues(0);
double[] fadeFBs = fade.getValues(1);
double[] outputs = output.getValues(0);
for (int i = start; i < limit; i++) {
// Scale and offset to 0.0 to 1.0 range.
double gainLR = (fadeLRs[i] * 0.5) + 0.5;
double temp = 1.0 - gainLR;
double mixFront = (inputAs[i] * temp) + (inputBs[i] * gainLR);
double mixBack = (inputDs[i] * temp) + (inputCs[i] * gainLR);
double gainFB = (fadeFBs[i] * 0.5) + 0.5;
outputs[i] = (mixBack * (1.0 - gainFB)) + (mixFront * gainFB);
}
}
}
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