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/*
* Copyright (C) 2011 The Android Open Source 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.
*/
package android.filterpacks.imageproc;
import android.filterfw.core.FilterContext;
import android.filterfw.core.Program;
import android.filterfw.core.ShaderProgram;
/**
* The filter linearly blends "left" and "right" frames. The blending weight is
* the multiplication of parameter "blend" and the alpha value in "right" frame.
* @hide
*/
public class BlendFilter extends ImageCombineFilter {
private final String mBlendShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform sampler2D tex_sampler_1;\n" +
"uniform float blend;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" vec4 colorL = texture2D(tex_sampler_0, v_texcoord);\n" +
" vec4 colorR = texture2D(tex_sampler_1, v_texcoord);\n" +
" float weight = colorR.a * blend;\n" +
" gl_FragColor = mix(colorL, colorR, weight);\n" +
"}\n";
public BlendFilter(String name) {
super(name, new String[] { "left", "right" }, "blended", "blend");
}
@Override
protected Program getNativeProgram(FilterContext context) {
throw new RuntimeException("TODO: Write native implementation for Blend!");
}
@Override
protected Program getShaderProgram(FilterContext context) {
return new ShaderProgram(context, mBlendShader);
}
}
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