1 files changed, 59 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/wallpapers/photophase/effects/ScanlinesEffect.java b/src/org/cyanogenmod/wallpapers/photophase/effects/ScanlinesEffect.java
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+++ b/src/org/cyanogenmod/wallpapers/photophase/effects/ScanlinesEffect.java
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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 Max Maischein of App-VideoMixer:
+//   http://cpansearch.perl.org/src/CORION/App-VideoMixer-0.02/filters/scanlines.glsl
+//
+
+package org.cyanogenmod.wallpapers.photophase.effects;
+
+import android.media.effect.EffectContext;
+
+/**
+ * A TV scanline effect<br/>
+ * <table>
+ * <tr><td>Parameter name</td><td>Meaning</td><td>Valid values</td></tr>
+ * </table>
+ */
+public class ScanlinesEffect extends PhotoPhaseEffect {
+
+    private static final String FRAGMENT_SHADER =
+            "precision mediump float;\n" +
+            "uniform sampler2D tex_sampler;\n" +
+            "uniform float offset;\n" +
+            "float frequency = 83.0;\n" +
+            "varying vec2 v_texcoord;\n" +
+            "void main(void)\n" +
+            "{\n" +
+            "    float global_pos = (v_texcoord.y + offset) * frequency;\n" +
+            "    float wave_pos = cos((fract(global_pos) - 0.5)*3.14);\n" +
+            "    vec4 pel = texture2D(tex_sampler, v_texcoord);\n" +
+            "    gl_FragColor = mix(vec4(0,0,0,0), pel, wave_pos);\n" +
+            "}";
+
+    /**
+     * Constructor of <code>ScanlinesEffect</code>.
+     *
+     * @param ctx The effect context
+     * @param name The effect name
+     */
+    public ScanlinesEffect(EffectContext ctx, String name) {
+        super(ctx, ScanlinesEffect.class.getName());
+        init(VERTEX_SHADER, FRAGMENT_SHADER);
+    }
+
+}