/*
* 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;
/**
* Runs a 3x3 convolution kernel against the image
*/
public class GPUImage3x3ConvolutionFilter extends GPUImage3x3TextureSamplingFilter {
public static final String THREE_X_THREE_TEXTURE_SAMPLING_FRAGMENT_SHADER = "" +
"precision highp float;\n" +
"\n" +
"uniform sampler2D inputImageTexture;\n" +
"\n" +
"uniform mediump mat3 convolutionMatrix;\n" +
"\n" +
"varying vec2 textureCoordinate;\n" +
"varying vec2 leftTextureCoordinate;\n" +
"varying vec2 rightTextureCoordinate;\n" +
"\n" +
"varying vec2 topTextureCoordinate;\n" +
"varying vec2 topLeftTextureCoordinate;\n" +
"varying vec2 topRightTextureCoordinate;\n" +
"\n" +
"varying vec2 bottomTextureCoordinate;\n" +
"varying vec2 bottomLeftTextureCoordinate;\n" +
"varying vec2 bottomRightTextureCoordinate;\n" +
"\n" +
"void main()\n" +
"{\n" +
" mediump vec4 bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate);\n" +
" mediump vec4 bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate);\n" +
" mediump vec4 bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate);\n" +
" mediump vec4 centerColor = texture2D(inputImageTexture, textureCoordinate);\n" +
" mediump vec4 leftColor = texture2D(inputImageTexture, leftTextureCoordinate);\n" +
" mediump vec4 rightColor = texture2D(inputImageTexture, rightTextureCoordinate);\n" +
" mediump vec4 topColor = texture2D(inputImageTexture, topTextureCoordinate);\n" +
" mediump vec4 topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate);\n" +
" mediump vec4 topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate);\n" +
"\n" +
" mediump vec4 resultColor = topLeftColor * convolutionMatrix[0][0] + topColor * convolutionMatrix[0][1] + topRightColor * convolutionMatrix[0][2];\n" +
" resultColor += leftColor * convolutionMatrix[1][0] + centerColor * convolutionMatrix[1][1] + rightColor * convolutionMatrix[1][2];\n" +
" resultColor += bottomLeftColor * convolutionMatrix[2][0] + bottomColor * convolutionMatrix[2][1] + bottomRightColor * convolutionMatrix[2][2];\n" +
"\n" +
" gl_FragColor = resultColor;\n" +
"}";
private float[] mConvolutionKernel;
private int mUniformConvolutionMatrix;
/**
* Instantiates a new GPUimage3x3ConvolutionFilter with default values, that
* will look like the original image.
*/
public GPUImage3x3ConvolutionFilter() {
this(new float[] {
0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f
});
}
/**
* Instantiates a new GPUimage3x3ConvolutionFilter with given convolution kernel.
*
* @param convolutionKernel the convolution kernel
*/
public GPUImage3x3ConvolutionFilter(final float[] convolutionKernel) {
super(THREE_X_THREE_TEXTURE_SAMPLING_FRAGMENT_SHADER);
mConvolutionKernel = convolutionKernel;
}
@Override
public void onInit() {
super.onInit();
mUniformConvolutionMatrix = GLES20.glGetUniformLocation(getProgram(), "convolutionMatrix");
setConvolutionKernel(mConvolutionKernel);
}
/**
* Sets the convolution kernel.
*
* @param convolutionKernel the new convolution kernel
*/
public void setConvolutionKernel(final float[] convolutionKernel) {
mConvolutionKernel = convolutionKernel;
setUniformMatrix3f(mUniformConvolutionMatrix, mConvolutionKernel);
}
}