/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* 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.badlogic.gdx.graphics.g3d.particles.influencers;
import com.badlogic.gdx.graphics.g3d.particles.ParallelArray.ChannelDescriptor;
import com.badlogic.gdx.graphics.g3d.particles.ParallelArray.FloatChannel;
import com.badlogic.gdx.graphics.g3d.particles.ParticleChannels;
import com.badlogic.gdx.graphics.g3d.particles.values.ScaledNumericValue;
import com.badlogic.gdx.utils.Json;
import com.badlogic.gdx.utils.JsonValue;
/** It's an {@link Influencer} which controls a generic channel of the particles. It handles the interpolation through time using
* {@link ScaledNumericValue}.
* @author Inferno */
public abstract class SimpleInfluencer extends Influencer {
public ScaledNumericValue value;
FloatChannel valueChannel, interpolationChannel, lifeChannel;
ChannelDescriptor valueChannelDescriptor;
public SimpleInfluencer () {
value = new ScaledNumericValue();
value.setHigh(1);
}
public SimpleInfluencer (SimpleInfluencer billboardScaleinfluencer) {
this();
set(billboardScaleinfluencer);
}
private void set (SimpleInfluencer scaleInfluencer) {
value.load(scaleInfluencer.value);
valueChannelDescriptor = scaleInfluencer.valueChannelDescriptor;
}
@Override
public void allocateChannels () {
valueChannel = controller.particles.addChannel(valueChannelDescriptor);
ParticleChannels.Interpolation.id = controller.particleChannels.newId();
interpolationChannel = controller.particles.addChannel(ParticleChannels.Interpolation);
lifeChannel = controller.particles.addChannel(ParticleChannels.Life);
}
@Override
public void activateParticles (int startIndex, int count) {
if (!value.isRelative()) {
for (int i = startIndex * valueChannel.strideSize, a = startIndex * interpolationChannel.strideSize, c = i + count
* valueChannel.strideSize; i < c; i += valueChannel.strideSize, a += interpolationChannel.strideSize) {
float start = value.newLowValue();
float diff = value.newHighValue() - start;
interpolationChannel.data[a + ParticleChannels.InterpolationStartOffset] = start;
interpolationChannel.data[a + ParticleChannels.InterpolationDiffOffset] = diff;
valueChannel.data[i] = start + diff * value.getScale(0);
}
} else {
for (int i = startIndex * valueChannel.strideSize, a = startIndex * interpolationChannel.strideSize, c = i + count
* valueChannel.strideSize; i < c; i += valueChannel.strideSize, a += interpolationChannel.strideSize) {
float start = value.newLowValue();
float diff = value.newHighValue();
interpolationChannel.data[a + ParticleChannels.InterpolationStartOffset] = start;
interpolationChannel.data[a + ParticleChannels.InterpolationDiffOffset] = diff;
valueChannel.data[i] = start + diff * value.getScale(0);
}
}
}
@Override
public void update () {
for (int i = 0, a = 0, l = ParticleChannels.LifePercentOffset, c = i + controller.particles.size * valueChannel.strideSize; i < c; i += valueChannel.strideSize, a += interpolationChannel.strideSize, l += lifeChannel.strideSize) {
valueChannel.data[i] = interpolationChannel.data[a + ParticleChannels.InterpolationStartOffset]
+ interpolationChannel.data[a + ParticleChannels.InterpolationDiffOffset] * value.getScale(lifeChannel.data[l]);
}
}
@Override
public void write (Json json) {
json.writeValue("value", value);
}
@Override
public void read (Json json, JsonValue jsonData) {
value = json.readValue("value", ScaledNumericValue.class, jsonData);
}
}