/*
* Copyright (C) 2014 The CyanogenMod Project
*
*
* 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.
*/
//
// Based on the shaders of kodemongki:
// http://kodemongki.blogspot.com.es/2011/06/kameraku-custom-shader-effects-example.html
//
package org.cyanogenmod.wallpapers.photophase.effects;
import android.media.effect.EffectContext;
import android.opengl.GLES20;
import android.util.Log;
import org.cyanogenmod.wallpapers.photophase.utils.GLESUtil;
/**
* A pixelate effect
*
Parameter name | Meaning | Valid values |
strength |
* The pixelate strength. | *Positive float (>0). Higher numbers produce more pixelation. | *
PixelateEffect
.
*
* @param ctx The effect context
* @param name The effect name
*/
public PixelateEffect(EffectContext ctx, String name) {
super(ctx, PixelateEffect.class.getName());
init(VERTEX_SHADER, FRAGMENT_SHADER);
}
/**
* {@inheritDoc}
*/
@Override
void init(String vertexShader, String fragmentShader) {
super.init(vertexShader, fragmentShader);
// Parameters
mStepsHandle = GLES20.glGetUniformLocation(mProgram, "strength");
GLESUtil.glesCheckError("glGetUniformLocation");
}
/**
* {@inheritDoc}
*/
@Override
void applyParameters() {
// Set parameters
GLES20.glUniform1f(mStepsHandle, mStrength);
GLESUtil.glesCheckError("glUniform1f");
}
/**
* {@inheritDoc}
*/
@Override
public void setParameter(String parameterKey, Object value) {
if (parameterKey.compareTo(STRENGTH_PARAMETER) == 0) {
try {
float strength = Float.parseFloat(value.toString());
if (strength <= 0) {
Log.w(TAG, "strength parameter must be >= 0");
return;
}
mStrength = strength;
} catch (NumberFormatException ex) {
// Ignore
}
}
}
}