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/*
* Copyright (C) 2013 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;
/**
* An outline effect (highlight edges)<br/>
* <table>
* <tr><td>Parameter name</td><td>Meaning</td><td>Valid values</td></tr>
* </table>
*/
public class OutlineEffect extends PhotoPhaseEffect {
private static final String FRAGMENT_SHADER =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler;\n" +
"varying vec2 v_texcoord;\n" +
"const float step_w = 0.0015625;\n" +
"const float step_h = 0.0027778;\n" +
"void main(void)\n" +
"{\n" +
" vec3 t1 = texture2D(tex_sampler, vec2(v_texcoord.x - step_w, v_texcoord.y - step_h)).bgr;\n" +
" vec3 t2 = texture2D(tex_sampler, vec2(v_texcoord.x, v_texcoord.y - step_h)).bgr;\n" +
" vec3 t3 = texture2D(tex_sampler, vec2(v_texcoord.x + step_w, v_texcoord.y - step_h)).bgr;\n" +
" vec3 t4 = texture2D(tex_sampler, vec2(v_texcoord.x - step_w, v_texcoord.y)).bgr;\n" +
" vec3 t5 = texture2D(tex_sampler, v_texcoord).bgr;\n" +
" vec3 t6 = texture2D(tex_sampler, vec2(v_texcoord.x + step_w, v_texcoord.y)).bgr;\n" +
" vec3 t7 = texture2D(tex_sampler, vec2(v_texcoord.x - step_w, v_texcoord.y + step_h)).bgr;\n" +
" vec3 t8 = texture2D(tex_sampler, vec2(v_texcoord.x, v_texcoord.y + step_h)).bgr;\n" +
" vec3 t9 = texture2D(tex_sampler, vec2(v_texcoord.x + step_w, v_texcoord.y + step_h)).bgr;\n" +
" vec3 xx= t1 + 2.0*t2 + t3 - t7 - 2.0*t8 - t9;\n" +
" vec3 yy = t1 - t3 + 2.0*t4 - 2.0*t6 + t7 - t9;\n" +
" vec3 rr = sqrt(xx * xx + yy * yy);\n" +
" float y = (rr.r + rr.g + rr.b) / 3.0;\n" +
" if (y > 0.2)\n" +
" rr = vec3(0.0, 0.0, 0.0);\n" +
" else\n" +
" rr = vec3(1.0, 1.0, 1.0);\n" +
" gl_FragColor.a = 1.0;\n" +
" gl_FragColor.rgb = rr;\n" +
"}";
/**
* Constructor of <code>OutlineEffect</code>.
*
* @param ctx The effect context
* @param name The effect name
*/
public OutlineEffect(EffectContext ctx, String name) {
super(ctx, OutlineEffect.class.getName());
init(VERTEX_SHADER, FRAGMENT_SHADER);
}
}
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