Distorted Android

        <activity android:name=".stencil.StencilActivity"/>

import org.distorted.examples.stencil.StencilActivity;

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

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

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

      activityMapping.put(i++, StencilActivity.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.stencil;

import android.app.Activity;

import android.os.Bundle;

import org.distorted.library.Distorted;

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

public class StencilActivity extends Activity

{

    private StencilSurfaceView mView;

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

    @Override

    protected void onCreate(Bundle icicle)

      {

      super.onCreate(icicle);

      mView = new StencilSurfaceView(this);

      setContentView(mView);

      }

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

    @Override

    protected void onPause() 

      {

      mView.onPause();

      Distorted.onPause();

      super.onPause();

      }

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

    @Override

    protected void onResume() 

      {

      super.onResume();

      mView.onResume();

      }

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

    @Override

    protected void onDestroy() 

      {

      Distorted.onDestroy();

      super.onDestroy();

      }

}

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

// 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.stencil;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.opengl.GLSurfaceView;

import org.distorted.examples.R;

import org.distorted.library.Distorted;

import org.distorted.library.DistortedEffects;

import org.distorted.library.DistortedScreen;

import org.distorted.library.DistortedTexture;

import org.distorted.library.EffectNames;

import org.distorted.library.EffectTypes;

import org.distorted.library.MeshCubes;

import org.distorted.library.MeshFlat;

import org.distorted.library.MeshObject;

import org.distorted.library.type.Dynamic1D;

import org.distorted.library.type.Static1D;

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 StencilRenderer implements GLSurfaceView.Renderer

{

    private GLSurfaceView mView;

    private DistortedScreen mScreen;

    private DistortedTexture mCubeTex, mFloorTex;

    private DistortedEffects mCube1Effects, mCube2Effects, mFloorEffects;

    private MeshObject mCubeMesh, mFloorMesh;

    private int bmpHeight, bmpWidth;

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

    StencilRenderer(GLSurfaceView v)

      {

      mView = v;

      mCubeMesh  = new MeshCubes(1,1,false);

      mFloorMesh = new MeshFlat(1,1);

      mCubeTex   = new DistortedTexture(1,1);

      mFloorTex  = new DistortedTexture(1,1);

      mCube1Effects = new DistortedEffects();

      mCube2Effects = new DistortedEffects();

      mFloorEffects = new DistortedEffects();

      mCube2Effects.brightness(new Static1D(0.5f));

      mScreen = new DistortedScreen();

      mScreen.attach(mCubeTex ,mCube1Effects,mCubeMesh );

      mScreen.attach(mFloorTex,mFloorEffects,mFloorMesh);

      mScreen.attach(mCubeTex ,mCube2Effects,mCubeMesh );

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

      }

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

    public void onDrawFrame(GL10 glUnused) 

      {

      mScreen.render(System.currentTimeMillis());

      }

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

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

      {

      float cw = mCubeTex.getWidth();

      float ch = mCubeTex.getHeight();

      float cd = mCubeTex.getDepth(mCubeMesh);

      float fw = mFloorTex.getWidth();

      float fh = mFloorTex.getHeight();

      float fd = mFloorTex.getDepth(mFloorMesh);

      float cubeScale = 0.4f*(width>height ? height/ch:width/cw);

      float floorScale= 0.8f*(width>height ? height/fh:width/fw);

      Static3D cubeCenter = new Static3D(cw/2,ch  ,-cd/2);

      Static3D floorCenter= new Static3D(fw/2,fh/2,-fd/2);

      Static3D axisX = new Static3D(1,0,0);

      Static3D axisY = new Static3D(0,1,0);

      Static3D axisZ = new Static3D(0,0,1);

      Dynamic1D rotDyn = new Dynamic1D(5000,0.0f);

      rotDyn.setMode(Dynamic1D.MODE_JUMP);

      rotDyn.add(new Static1D(  0));

      rotDyn.add(new Static1D(360));

      float angle = 30.0f;

      Static1D rotSt1 = new Static1D(angle);

      Static1D rotSt2 = new Static1D(angle-90.0f);

      mCube1Effects.abortEffects(EffectTypes.MATRIX);

      mCube1Effects.move( new Static3D( (width-cubeScale*cw)/2 , height/2-cubeScale*ch , cubeScale *cd/2) );

      mCube1Effects.scale(cubeScale);

      mCube1Effects.rotate(rotSt1, axisX, cubeCenter);

      mCube1Effects.rotate(rotDyn, axisY, cubeCenter);

      mCube2Effects.abortEffects(EffectTypes.MATRIX);

      mCube2Effects.move( new Static3D( (width-cubeScale*cw)/2 , height/2-cubeScale*ch , cubeScale *cd/2) );

      mCube2Effects.scale(cubeScale);

      mCube2Effects.rotate(rotSt1, axisX, cubeCenter);

      mCube2Effects.rotate(rotDyn, axisY, cubeCenter);

      mCube2Effects.scale(new Static3D(1,-1,1) );

      mCube2Effects.move( new Static3D( 0, -2*ch , 0) );

      mFloorEffects.abortEffects(EffectTypes.MATRIX);

      mFloorEffects.move( new Static3D( (width-floorScale*fw)/2 ,height/2-floorScale*fh/2, floorScale*fd/2) );

      mFloorEffects.scale(floorScale);

      mFloorEffects.rotate(rotSt2, axisX, floorCenter);

      mFloorEffects.rotate(rotDyn, axisZ, floorCenter);

      mScreen.resize(width, height);

      }

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

    public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {

      InputStream is = mView.getContext().getResources().openRawResource(R.raw.cat);

      Bitmap bitmap;

      try

        {

        bitmap = BitmapFactory.decodeStream(is);

        }

      finally

        {

        try

          {

          is.close();

          }

        catch(IOException e) { }

        }

      bmpHeight = bitmap.getHeight();

      bmpWidth  = bitmap.getWidth();

      mCubeTex.setTexture(bitmap);

      mFloorTex.setColor(0xff000000);  // ARGB

      DistortedEffects.enableEffect(EffectNames.BRIGHTNESS);

      try

        {

        Distorted.onCreate(mView.getContext());

        }

      catch(Exception ex)

        {

        android.util.Log.e("Stencil", 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.stencil;

import android.app.ActivityManager;

import android.content.Context;

import android.content.pm.ConfigurationInfo;

import android.opengl.GLSurfaceView;

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

class StencilSurfaceView extends GLSurfaceView

{

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

    public StencilSurfaceView(Context context)

      {

      super(context);

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

      final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();

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

      setRenderer(new StencilRenderer(this));

      }

}

    <string name="example_stencil">Stencil Buffer</string>

    <string name="example_stencil_subtitle">Implement the classic stencil example from https://open.gl/depthstencils</string>