/*
* Copyright (C) 2012 CyberAgent
*
* 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 jp.co.cyberagent.android.gpuimage;
import android.opengl.GLES20;
/**
* Reduces the color range of the image. <br>
* <br>
* colorLevels: ranges from 1 to 256, with a default of 10
*/
public class GPUImagePosterizeFilter extends GPUImageFilter {
public static final String POSTERIZE_FRAGMENT_SHADER = "" +
"varying highp vec2 textureCoordinate;\n" +
"\n" +
"uniform sampler2D inputImageTexture;\n" +
"uniform highp float colorLevels;\n" +
"\n" +
"void main()\n" +
"{\n" +
" highp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);\n" +
" \n" +
" gl_FragColor = floor((textureColor * colorLevels) + vec4(0.5)) / colorLevels;\n" +
"}";
private int mGLUniformColorLevels;
private int mColorLevels;
public GPUImagePosterizeFilter() {
this(10);
}
public GPUImagePosterizeFilter(final int colorLevels) {
super(GPUImageFilter.NO_FILTER_VERTEX_SHADER, POSTERIZE_FRAGMENT_SHADER);
mColorLevels = colorLevels;
}
@Override
public void onInit() {
super.onInit();
mGLUniformColorLevels = GLES20.glGetUniformLocation(getProgram(), "colorLevels");
setColorLevels(mColorLevels);
}
public void setColorLevels(final int colorLevels) {
mColorLevels = colorLevels;
setFloat(mGLUniformColorLevels, colorLevels);
}
}