Distorted Android

        <activity android:name=".mirror.MirrorActivity"/>

import org.distorted.examples.mirror.MirrorActivity;

   {

      final Map<String, Object> item = new HashMap<>();

      item.put(ITEM_IMAGE, R.drawable.icon_example_mirror);

      item.put(ITEM_TITLE, (i+1)+". "+getText(R.string.example_mirror));

      item.put(ITEM_SUBTITLE, getText(R.string.example_mirror_subtitle));

      data.add(item);

      activityMapping.put(i++, MirrorActivity.class);

   }

///////////////////////////////////////////////////////////////////////////////////////////////////

// Copyright 2016 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// Distorted is free software: you can redistribute it and/or modify                             //

// it under the terms of the GNU General Public License as published by                          //

// the Free Software Foundation, either version 2 of the License, or                             //

// (at your option) any later version.                                                           //

//                                                                                               //

// Distorted is distributed in the hope that it will be useful,                                  //

// but WITHOUT ANY WARRANTY; without even the implied warranty of                                //

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                 //

// GNU General Public License for more details.                                                  //

//                                                                                               //

// You should have received a copy of the GNU General Public License                             //

// along with Distorted.  If not, see <http://www.gnu.org/licenses/>.                            //

///////////////////////////////////////////////////////////////////////////////////////////////////

package org.distorted.examples.mirror;

import android.app.Activity;

import android.opengl.GLSurfaceView;

import android.os.Bundle;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import org.distorted.examples.R;

import org.distorted.library.Distorted;

///////////////////////////////////////////////////////////////////////////////////////////////////

public class MirrorActivity extends Activity implements OnSeekBarChangeListener

{

    @Override

    protected void onCreate(Bundle icicle) 

      {

      super.onCreate(icicle);

      setContentView(R.layout.mirrorlayout);

      SeekBar bar = (SeekBar)findViewById(R.id.mirrorSeek);

      bar.setOnSeekBarChangeListener(this);

      bar.setProgress(100);

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    @Override

    protected void onPause() 

      {

      GLSurfaceView view = (GLSurfaceView) this.findViewById(R.id.mirrorSurfaceView);

      view.onPause();

      super.onPause();

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    @Override

    protected void onResume() 

      {

      super.onResume();

      MirrorSurfaceView view = (MirrorSurfaceView) this.findViewById(R.id.mirrorSurfaceView);

      view.onResume();

      view.getRenderer().onResume();

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    @Override

    protected void onDestroy() 

      {

      Distorted.onDestroy();  

      super.onDestroy();

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    public void onProgressChanged(SeekBar bar, int progress, boolean fromUser) 

      {

      switch (bar.getId()) 

        {

        case R.id.mirrorSeek: MirrorSurfaceView view = (MirrorSurfaceView) this.findViewById(R.id.mirrorSurfaceView);

                              view.getRenderer().setPosition(progress);

                              break;

        }

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    public void onStartTrackingTouch(SeekBar bar) { }

///////////////////////////////////////////////////////////////////////////////////////////////////

    public void onStopTrackingTouch(SeekBar bar)  { }

///////////////////////////////////////////////////////////////////////////////////////////////////

}

///////////////////////////////////////////////////////////////////////////////////////////////////

// Copyright 2016 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// Distorted is free software: you can redistribute it and/or modify                             //

// it under the terms of the GNU General Public License as published by                          //

// the Free Software Foundation, either version 2 of the License, or                             //

// (at your option) any later version.                                                           //

//                                                                                               //

// Distorted is distributed in the hope that it will be useful,                                  //

// but WITHOUT ANY WARRANTY; without even the implied warranty of                                //

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                 //

// GNU General Public License for more details.                                                  //

//                                                                                               //

// You should have received a copy of the GNU General Public License                             //

// along with Distorted.  If not, see <http://www.gnu.org/licenses/>.                            //

///////////////////////////////////////////////////////////////////////////////////////////////////

package org.distorted.examples.mirror;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.opengl.GLES20;

import android.opengl.GLSurfaceView;

import org.distorted.examples.R;

import org.distorted.library.Distorted;

import org.distorted.library.DistortedEffects;

import org.distorted.library.DistortedFramebuffer;

import org.distorted.library.DistortedTexture;

import org.distorted.library.GridFlat;

import org.distorted.library.type.Dynamic3D;

import org.distorted.library.type.Static3D;

import java.io.IOException;

import java.io.InputStream;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

///////////////////////////////////////////////////////////////////////////////////////////////////

class MirrorRenderer implements GLSurfaceView.Renderer

{

   private static final float SCALE = 0.5f;

   private GLSurfaceView mView;

   private DistortedEffects mEffectsMirror, mEffectsGirl, mEffectsOffscreen, mEffectsNull;

   private DistortedTexture mTextureMirror, mTextureGirl;

   private DistortedFramebuffer mScreen, mOffScreen1, mOffScreen2;

   private GridFlat mQuad;

   private Static3D mGirlPosition;

   private Dynamic3D mGirlDyn;

   private int mMirrorW, mMirrorH, mGirlW, mGirlH;

   private int mScreenW, mScreenH;

///////////////////////////////////////////////////////////////////////////////////////////////////

   MirrorRenderer(GLSurfaceView view)

      { 

      mView    = view;

      mQuad    = new GridFlat(1,1);

      mScreen  = new DistortedFramebuffer(0);

      mEffectsMirror   = new DistortedEffects();

      mEffectsGirl     = new DistortedEffects();

      mEffectsOffscreen= new DistortedEffects();

      mEffectsNull     = new DistortedEffects();

      mGirlPosition = new Static3D(0,0,0);

      mGirlDyn      = new Dynamic3D();

      mGirlDyn.add(mGirlPosition);

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

   void setPosition(int pos)

      {

      mGirlPosition.set1(pos*mScreenW / 100.0f);

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

   public void onResume()

     {

     mScreenW = 0;

     mScreenH = 0;

     }

///////////////////////////////////////////////////////////////////////////////////////////////////

   public void onDrawFrame(GL10 glUnused) 

      {

      GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);

      long time = System.currentTimeMillis();

      mOffScreen1.renderTo( mTextureMirror, mQuad, mEffectsMirror   , time );

      mOffScreen1.renderTo( mOffScreen2   , mQuad, mEffectsOffscreen, time );

      mOffScreen1.renderTo( mTextureGirl  , mQuad, mEffectsGirl     , time );

      mOffScreen2.renderTo( mOffScreen1   , mQuad, mEffectsNull     , time );

      mScreen.renderTo    ( mOffScreen1   , mQuad, mEffectsMirror   , time );

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

   public void onSurfaceChanged(GL10 glUnused, int width, int height) 

      {

      if( mScreenW!=width || mScreenH!=height)

        {

        mScreenW = width;

        mScreenH = height;

        mOffScreen1 = new DistortedFramebuffer(mScreenW,mScreenH);

        mOffScreen2 = new DistortedFramebuffer( (int)(SCALE*mScreenW), (int)(SCALE*mScreenH) );

        mEffectsGirl.abortAllEffects();

        mEffectsMirror.abortAllEffects();

        mEffectsOffscreen.abortAllEffects();

        mEffectsMirror.scale( new Static3D( (float)mScreenW/mMirrorW, (float)mScreenH/mMirrorH, 1.0f) );

        mEffectsOffscreen.move( new Static3D( mScreenW/10, mScreenH/10, 0) );

        mEffectsGirl.move(mGirlDyn);

        mGirlPosition.set2(mScreenH*0.9f);

        mScreen.resize(mScreenW,mScreenH);

        }

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

   public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {

      GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

      InputStream isM = mView.getContext().getResources().openRawResource(R.raw.mirror);

      InputStream isG = mView.getContext().getResources().openRawResource(R.raw.face);

      Bitmap bitmapM, bitmapG;

      try

        {

        bitmapM = BitmapFactory.decodeStream(isM);

        bitmapG = BitmapFactory.decodeStream(isG);

        }

      finally

        {

        try

          {

          isM.close();

          isG.close();

          }

        catch(IOException e) { }

        }

      mMirrorW = bitmapM.getWidth();

      mMirrorH = bitmapM.getHeight();

      mGirlW   = bitmapG.getWidth();

      mGirlH   = bitmapG.getHeight();

      mTextureMirror = new DistortedTexture(mMirrorW,mMirrorH);

      mTextureGirl   = new DistortedTexture(mGirlW, mGirlH);

      mTextureMirror.setTexture(bitmapM);

      mTextureGirl.setTexture(bitmapG);

      try

        {

        Distorted.onSurfaceCreated(mView.getContext());

        }

      catch(Exception ex)

        {

        android.util.Log.e("Mirror", ex.getMessage() );

        }

      }

}

///////////////////////////////////////////////////////////////////////////////////////////////////

// Copyright 2016 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// Distorted is free software: you can redistribute it and/or modify                             //

// it under the terms of the GNU General Public License as published by                          //

// the Free Software Foundation, either version 2 of the License, or                             //

// (at your option) any later version.                                                           //

//                                                                                               //

// Distorted is distributed in the hope that it will be useful,                                  //

// but WITHOUT ANY WARRANTY; without even the implied warranty of                                //

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                 //

// GNU General Public License for more details.                                                  //

//                                                                                               //

// You should have received a copy of the GNU General Public License                             //

// along with Distorted.  If not, see <http://www.gnu.org/licenses/>.                            //

///////////////////////////////////////////////////////////////////////////////////////////////////

package org.distorted.examples.mirror;

import android.content.Context;

import android.opengl.GLSurfaceView;

import android.util.AttributeSet;

///////////////////////////////////////////////////////////////////////////////////////////////////

class MirrorSurfaceView extends GLSurfaceView

{

    private MirrorRenderer mRenderer;

///////////////////////////////////////////////////////////////////////////////////////////////////

    public MirrorSurfaceView(Context c, AttributeSet attrs)

      {

      super(c, attrs);

      if(!isInEditMode())

        {

        setEGLContextClientVersion(2);

        mRenderer = new MirrorRenderer(this);

        setRenderer(mRenderer);

        }

      }

///////////////////////////////////////////////////////////////////////////////////////////////////

    public MirrorRenderer getRenderer()

      {

      return mRenderer;

      }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <org.distorted.examples.mirror.MirrorSurfaceView

        android:id="@+id/mirrorSurfaceView"

        android:layout_width="fill_parent"

        android:layout_height="0dp"

        android:layout_weight="1" />

    <LinearLayout

        android:id="@+id/linearLayout1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:gravity="center|fill_horizontal"

        android:orientation="horizontal"

        android:paddingBottom="10dp"

        android:paddingTop="10dp" >

        <SeekBar

            android:id="@+id/mirrorSeek"

            android:layout_weight="1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:paddingLeft="10dp"

            android:paddingRight="10dp" />

    </LinearLayout>

</LinearLayout>

    <string name="example_mirror">Mirror</string>

    <string name="example_mirror_subtitle">Ping-pong between offscreen buffers to achieve the \'infinite mirror\' effect.</string>