Distorted Android

        <activity android:name=".transparency.TransparencyActivity"/>

import org.distorted.examples.transparency.TransparencyActivity;

   {

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

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

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

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

      data.add(item);

      activityMapping.put(i++, TransparencyActivity.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.transparency;

import android.app.Activity;

import android.opengl.GLSurfaceView;

import android.os.Bundle;

import android.view.View;

import android.widget.SeekBar;

import org.distorted.examples.R;

import org.distorted.library.main.Distorted;

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

public class TransparencyActivity extends Activity implements SeekBar.OnSeekBarChangeListener

{

    private int mRenderFirst;

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

    @Override

    protected void onCreate(Bundle savedState) 

      {

      super.onCreate(savedState);

      setContentView(R.layout.transparencylayout);

      SeekBar barRed    = (SeekBar)findViewById(R.id.transparencySeekRed);

      SeekBar barYellow = (SeekBar)findViewById(R.id.transparencySeekYellow);

      barRed.setOnSeekBarChangeListener(this);

      barYellow.setOnSeekBarChangeListener(this);

      if( savedState==null )

        {

        barRed.setProgress(50);

        barYellow.setProgress(50);

        privateRenderFirst(0);

        }

      }

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

    @Override

    protected void onPause() 

      {

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

      view.onPause();

      Distorted.onPause();

      super.onPause();

      }

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

    @Override

    protected void onResume() 

      {

      super.onResume();

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

      view.onResume();

      }

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

    @Override

    protected void onDestroy() 

      {

      Distorted.onDestroy();  

      super.onDestroy();

      }

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

    @Override

    public void onSaveInstanceState(Bundle savedInstanceState)

      {

      super.onSaveInstanceState(savedInstanceState);

      savedInstanceState.putInt("render", mRenderFirst);

      }

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

    @Override

    public void onRestoreInstanceState(Bundle savedInstanceState)

      {

      super.onRestoreInstanceState(savedInstanceState);

      mRenderFirst= savedInstanceState.getInt("render");

      privateRenderFirst(mRenderFirst);

      }

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

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

      {

      switch (bar.getId())

        {

        case R.id.transparencySeekRed:    TransparencySurfaceView view0 = (TransparencySurfaceView) this.findViewById(R.id.transparencySurfaceView);

                                          view0.getRenderer().setTransparency(0, (float)progress/100 );

                                          break;

        case R.id.transparencySeekYellow: TransparencySurfaceView view1 = (TransparencySurfaceView) this.findViewById(R.id.transparencySurfaceView);

                                          view1.getRenderer().setTransparency(1, (float)progress/100 );

                                          break;

        }

      }

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

    public void onStartTrackingTouch(SeekBar bar) { }

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

    public void onStopTrackingTouch(SeekBar bar)  { }

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

    public void renderFirst(View v)

      {

      switch(v.getId())

        {

        case R.id.transparencyRed   : privateRenderFirst(0); break;

        case R.id.transparencyYellow: privateRenderFirst(1); break;

        }

      }

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

    private void privateRenderFirst(int index)

      {

      TransparencySurfaceView view = (TransparencySurfaceView) this.findViewById(R.id.transparencySurfaceView);

      TransparencyRenderer renderer= view.getRenderer();

      renderer.setRenderFirst(index);

      mRenderFirst = index;

      }

}

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

// 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.transparency;

import android.opengl.GLSurfaceView;

import org.distorted.library.effect.FragmentEffectAlpha;

import org.distorted.library.effect.MatrixEffectMove;

import org.distorted.library.effect.MatrixEffectQuaternion;

import org.distorted.library.effect.MatrixEffectScale;

import org.distorted.library.effect.PostprocessEffectBlur;

import org.distorted.library.main.Distorted;

import org.distorted.library.main.DistortedEffects;

import org.distorted.library.main.DistortedNode;

import org.distorted.library.main.DistortedScreen;

import org.distorted.library.main.DistortedTexture;

import org.distorted.library.main.MeshFlat;

import org.distorted.library.type.Static1D;

import org.distorted.library.type.Static3D;

import org.distorted.library.type.Static4D;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

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

class TransparencyRenderer implements GLSurfaceView.Renderer

{

    private static final int NUM = 4; // 4 ints (x,y,z, argb) each describe 1 object below

    private static final int[] OBJECTS =

        {

         +9, -10, +2, 0xffff0000,

         -9, +10, -2, 0xffffff00

        };

    private static final int NUM_OBJECTS = OBJECTS.length/NUM;

    private static final int OBJ_SIZE    = 100;

    private GLSurfaceView mView;

    private DistortedNode[] mNode;

    private DistortedTexture[] mTex;

    private Static3D[]  mMoveVector;

    private Static1D[]  mAlphaVector;

    private DistortedScreen mScreen;

    private Static3D mMove, mScale, mCenter;

    Static4D mQuat1, mQuat2;

    int mScreenMin;

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

    TransparencyRenderer(GLSurfaceView v)

      {

      mView = v;

      MeshFlat mesh = new MeshFlat(1,1);

      mQuat1 = new Static4D(0,0,0,1);  // unity

      mQuat2 = new Static4D(0,0,0,1);  // quaternions

      mScreen = new DistortedScreen();

      mScreen.glClearColor(1.0f,1.0f,1.0f,1.0f);

      mMoveVector   = new Static3D[NUM_OBJECTS];

      mAlphaVector  = new Static1D[NUM_OBJECTS];

      mNode         = new DistortedNode[NUM_OBJECTS];

      mTex          = new DistortedTexture[NUM_OBJECTS];

      FragmentEffectAlpha[] alpha= new FragmentEffectAlpha[NUM_OBJECTS];

      DistortedEffects[] effects = new DistortedEffects[NUM_OBJECTS];

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

      mScale = new Static3D(1.0f,1.0f,1.0f);

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

      MatrixEffectMove moveEffect        = new MatrixEffectMove(mMove);

      MatrixEffectScale scaleEffect      = new MatrixEffectScale(mScale);

      MatrixEffectQuaternion quatEffect1 = new MatrixEffectQuaternion(mQuat1, mCenter);

      MatrixEffectQuaternion quatEffect2 = new MatrixEffectQuaternion(mQuat2, mCenter);

      PostprocessEffectBlur blur = new PostprocessEffectBlur(new Static1D(0));

      for(int i=0; i<NUM_OBJECTS; i++)

        {

        mTex[i]           = new DistortedTexture(OBJ_SIZE,OBJ_SIZE);

        mMoveVector[i]   = new Static3D(0,0,0);

        mAlphaVector[i]  = new Static1D(0.5f);

        alpha[i]         = new FragmentEffectAlpha(mAlphaVector[i]);

        effects[i]       = new DistortedEffects();

        //effects[i].apply(blur);

        effects[i].apply(alpha[i]);

        effects[i].apply(moveEffect);

        effects[i].apply(scaleEffect);

        effects[i].apply(quatEffect1);

        effects[i].apply(quatEffect2);

        effects[i].apply(new MatrixEffectMove(mMoveVector[i]));

        mNode[i] = new DistortedNode(mTex[i], effects[i], mesh );

        mScreen.attach(mNode[i]);

        }

      }

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

    void setTransparency(int object, float level)

      {

      if( object>=0 && object<NUM_OBJECTS) mAlphaVector[object].set(level);

      }

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

// no better way to attach mNode[object] as the first child than detaching all and reattaching back...

    void setRenderFirst(int object)

      {

      if( object>=0 && object<NUM_OBJECTS)

        {

        for(int i=0; i<NUM_OBJECTS; i++)

          {

          mScreen.detach(mNode[i]);

          }

        mScreen.attach(mNode[object]);

        for(int i=0; i<NUM_OBJECTS; i++)

          {

          if( i!=object )

            mScreen.attach(mNode[i]);

          }

        }

      }

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

    public void onDrawFrame(GL10 glUnused) 

      {

      mScreen.render(System.currentTimeMillis());

      }

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

    public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {

      for(int i=0; i<NUM_OBJECTS; i++)

        {

        mTex[i].setColor(OBJECTS[NUM * i + 3]);

        }

      PostprocessEffectBlur.enable();

      FragmentEffectAlpha.enable();

      try

        {

        Distorted.onCreate(mView.getContext());

        }

      catch(Exception ex)

        {

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

        }

      }

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

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

      {

      mScreenMin = width<height ? width:height;

      float factor = 0.70f*mScreenMin/OBJ_SIZE;

      mScale.set(factor,factor,factor);

      mCenter.set((float)OBJ_SIZE/2, (float)OBJ_SIZE/2, -(float)OBJ_SIZE/2 );

      mMove.set( (width -factor*OBJ_SIZE)/2 ,(height-factor*OBJ_SIZE)/2 ,0);

      float size= 0.02f*OBJ_SIZE;

      for(int i=0; i<NUM_OBJECTS; i++)

        {

        mMoveVector[i].set(size*OBJECTS[NUM*i], size*OBJECTS[NUM*i+1], size*OBJECTS[NUM*i+2]);

        }

      mScreen.resize(width, height);

      }

}

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

// 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.transparency;

import android.app.ActivityManager;

import android.content.Context;

import android.content.pm.ConfigurationInfo;

import android.opengl.GLSurfaceView;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.widget.Toast;

import org.distorted.examples.R;

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

class TransparencySurfaceView extends GLSurfaceView

{

    private int mX, mY;

    private TransparencyRenderer mRenderer;

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

    public TransparencySurfaceView(Context context, AttributeSet attrs)

      {

      super(context, attrs);

      mX = -1;

      mY = -1;

      if(!isInEditMode())

        {

        mRenderer = new TransparencyRenderer(this);

        final ActivityManager activityManager     = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

        final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();

        setEGLContextClientVersion( (configurationInfo.reqGlEsVersion>>16) >= 3 ? 3:2 );

        setRenderer(mRenderer);

        Toast.makeText(context, R.string.example_rotate_toast , Toast.LENGTH_SHORT).show();

        }

      }

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

    public TransparencyRenderer getRenderer()

      {

      return mRenderer;

      }

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

    @Override public boolean onTouchEvent(MotionEvent event) 

      {

      int action = event.getAction();

      int x = (int)event.getX();

      int y = (int)event.getY();

      switch(action)

         {

         case MotionEvent.ACTION_DOWN: mX = x;

                                       mY = y;

                                       break;

         case MotionEvent.ACTION_MOVE: if( mX>=0 && mY>= 0 )

                                         {

                                         float px = mY-y;

                                         float py = mX-x;

                                         float pz = 0;

                                         float plen = (float)Math.sqrt(px*px + py*py + pz*pz);

                                         if( plen>0 )

                                           {

                                           px /= plen;

                                           py /= plen;

                                           pz /= plen;

                                           float cosA = (float)Math.cos(plen*3.14f/mRenderer.mScreenMin);

                                           float sinA = (float)Math.sqrt(1-cosA*cosA);

                                           mRenderer.mQuat1.set(px*sinA, py*sinA, pz*sinA, cosA);

                                           }

                                         }                             

                                       break;

         case MotionEvent.ACTION_UP  : mX = -1;

                                       mY = -1;

                                       float qx = mRenderer.mQuat1.get1();

                                       float qy = mRenderer.mQuat1.get2();

                                       float qz = mRenderer.mQuat1.get3();

                                       float qw = mRenderer.mQuat1.get4();

                                       float rx = mRenderer.mQuat2.get1();

                                       float ry = mRenderer.mQuat2.get2();

                                       float rz = mRenderer.mQuat2.get3();

                                       float rw = mRenderer.mQuat2.get4();

                                       // This is quaternion multiplication. (tx,ty,tz,tw)

                                       // is now equal to (qx,qy,qz,qw)*(rx,ry,rz,rw)

                                       float tx = rw*qx - rz*qy + ry*qz + rx*qw;

                                       float ty = rw*qy + rz*qx + ry*qw - rx*qz;

                                       float tz = rw*qz + rz*qw - ry*qx + rx*qy;

                                       float tw = rw*qw - rz*qz - ry*qy - rx*qx;

                                       // The point of this is so that there are always

                                       // exactly 2 quaternions: Quat1 representing the rotation

                                       // accumulating only since the last screen touch, and Quat2

                                       // which remembers the combined effect of all previous

                                       // swipes.

                                       // We cannot be accumulating an ever-growing list of quaternions

                                       // and add a new one every time user swipes the screen - there

                                       // is a limited number of slots in the EffectQueueMatrix!

                                       mRenderer.mQuat1.set(0f, 0f, 0f, 1f);

                                       mRenderer.mQuat2.set(tx, ty, tz, tw);

                                       break;

         }

      return true;

      }

}

<?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.transparency.TransparencySurfaceView

        android:id="@+id/transparencySurfaceView"

        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="100dp"

        android:orientation="horizontal">

        <LinearLayout

            android:id="@+id/linearLayout2"

            android:layout_width="wrap_content"

            android:layout_height="fill_parent"

            android:orientation="vertical"

            android:layout_weight="0.1">

            <RadioGroup

                android:id="@+id/transparencyRadioGroup"

                android:layout_width="fill_parent"

                android:layout_height="fill_parent"

                android:orientation="vertical">

                <RadioButton

                    android:id="@+id/transparencyRed"

                    android:layout_width="fill_parent"

                    android:layout_height="wrap_content"

                    android:layout_weight="1"

                    android:background="@color/red"

                    android:onClick="renderFirst"

                    android:checked="true"

                    android:textSize="14sp"/>

                <RadioButton

                    android:id="@+id/transparencyYellow"

                    android:layout_width="fill_parent"

                    android:layout_height="wrap_content"

                    android:layout_weight="1"

                    android:background="@color/yellow"

                    android:onClick="renderFirst"

                    android:textSize="14sp"/>

            </RadioGroup>

        </LinearLayout>

        <LinearLayout

            android:id="@+id/linearLayout3"

            android:layout_width="wrap_content"

            android:layout_height="fill_parent"

            android:orientation="vertical"

            android:layout_weight="0.9">

            <SeekBar

                android:id="@+id/transparencySeekRed"

                android:background="@color/red"

                android:layout_height="50dp"

                android:layout_width="fill_parent"

                android:paddingLeft="10dp"

                android:paddingRight="10dp" />

            <SeekBar

                android:id="@+id/transparencySeekYellow"

                android:background="@color/yellow"

                android:layout_height="50dp"

                android:layout_width="fill_parent"

                android:paddingLeft="10dp"

                android:paddingRight="10dp" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

    <string name="example_transparency">Transparency</string>

    <string name="example_transparency_subtitle">Order Independent Transparency.</string>