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author | Jorge Ruesga <jorge@ruesga.com> | 2013-10-27 13:46:12 +0100 |
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committer | Jorge Ruesga <jorge@ruesga.com> | 2013-10-27 13:46:12 +0100 |
commit | a9b27719b9f448879fb5ac821ee7ac1cf22b33ce (patch) | |
tree | 935967d50d639244786802b849ad15d1af798dd4 /src/org/cyanogenmod/wallpapers/photophase/effects/PixelateEffect.java | |
parent | 49cba5cf09cf0e4f3b533f163ea183b83e617986 (diff) | |
download | android_packages_wallpapers_PhotoPhase-a9b27719b9f448879fb5ac821ee7ac1cf22b33ce.tar.gz android_packages_wallpapers_PhotoPhase-a9b27719b9f448879fb5ac821ee7ac1cf22b33ce.tar.bz2 android_packages_wallpapers_PhotoPhase-a9b27719b9f448879fb5ac821ee7ac1cf22b33ce.zip |
Returns as a CyanogenMod project. Update author and Copyrights
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Diffstat (limited to 'src/org/cyanogenmod/wallpapers/photophase/effects/PixelateEffect.java')
-rw-r--r-- | src/org/cyanogenmod/wallpapers/photophase/effects/PixelateEffect.java | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/wallpapers/photophase/effects/PixelateEffect.java b/src/org/cyanogenmod/wallpapers/photophase/effects/PixelateEffect.java new file mode 100644 index 0000000..fe37d4c --- /dev/null +++ b/src/org/cyanogenmod/wallpapers/photophase/effects/PixelateEffect.java @@ -0,0 +1,118 @@ +/* + * 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; +import android.opengl.GLES20; +import android.util.Log; + +import org.cyanogenmod.wallpapers.photophase.utils.GLESUtil; + +/** + * A pixelate effect<br/> + * <table> + * <tr><td>Parameter name</td><td>Meaning</td><td>Valid values</td></tr> + * <tr> + * <td><code>strength</code></td> + * <td>The pixelate strength.</td> + * <td>Positive float (>0). Higher numbers produce more pixelation.</td> + * </tr> + * </table> + */ +public class PixelateEffect extends PhotoPhaseEffect { + + private static final String TAG = "PixelateEffect"; + + private static final String STRENGTH_PARAMETER = "strength"; + + 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" + + "uniform float strength;\n" + + "void main(void)\n" + + "{\n" + + " float offx = floor(v_texcoord.s / (strength * step_w));\n" + + " float offy = floor(v_texcoord.t / (strength * step_h));\n" + + " vec3 res = texture2D(tex_sampler, vec2(offx * strength * step_w , offy * strength * step_h)).bgr;\n" + + " gl_FragColor.a = 1.0;\n" + + " gl_FragColor.rgb = res;\n" + + "}"; + + private float mStrength = 8.0f; + private int mStepsHandle; + + /** + * Constructor of <code>PixelateEffect</code>. + * + * @param ctx The effect context + * @param name The effect name + */ + public PixelateEffect(EffectContext ctx, String name) { + super(ctx, PixelateEffect.class.getName()); + init(VERTEX_SHADER, FRAGMENT_SHADER); + } + + /** + * {@inheritDoc} + */ + @Override + void init(String vertexShader, String fragmentShader) { + super.init(vertexShader, fragmentShader); + + // Parameters + mStepsHandle = GLES20.glGetUniformLocation(mProgram, "strength"); + GLESUtil.glesCheckError("glGetUniformLocation"); + } + + /** + * {@inheritDoc} + */ + @Override + void applyParameters() { + // Set parameters + GLES20.glUniform1f(mStepsHandle, mStrength); + GLESUtil.glesCheckError("glUniform1f"); + } + + /** + * {@inheritDoc} + */ + @Override + public void setParameter(String parameterKey, Object value) { + if (parameterKey.compareTo(STRENGTH_PARAMETER) == 0) { + try { + float strength = Float.parseFloat(value.toString()); + if (strength <= 0) { + Log.w(TAG, "strength parameter must be >= 0"); + return; + } + mStrength = strength; + } catch (NumberFormatException ex) { + // Ignore + } + } + } + +} |