Distorted Android

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

// 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.monalisa;

import java.io.IOException;

import java.io.InputStream;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

import org.distorted.examples.R;

import org.distorted.library.effect.MatrixEffectScale;

import org.distorted.library.effect.VertexEffectDistort;

import org.distorted.library.main.DistortedLibrary;

import org.distorted.library.main.DistortedEffects;

import org.distorted.library.main.DistortedScreen;

import org.distorted.library.main.DistortedTexture;

import org.distorted.library.mesh.MeshRectangles;

import org.distorted.library.type.Dynamic3D;

import org.distorted.library.type.Static3D;

import org.distorted.library.type.Static4D;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.opengl.GLSurfaceView;

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

class MonaLisaRenderer implements GLSurfaceView.Renderer 

{

    private GLSurfaceView mView;

    private DistortedEffects mEffects;

    private DistortedTexture mTexture;

    private MeshRectangles mMesh;

    private DistortedScreen mScreen;

    private Static3D mScale;

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

    MonaLisaRenderer(GLSurfaceView v)

      {

      mView = v;

      // MonaLisa bitmap is 320x366, this is thus (90,108) pixels from the lower-left corner

      Static3D centerLeft  = new Static3D( 90-320/2, 108-366/2,0);

      // (176,111) from the lower left

      Static3D centerRight = new Static3D(176-320/2, 111-366/2,0);

      // two regions defining the areas affected by the Distort effect

      Static4D rLeft  = new Static4D(-10, 10, 0, 25);

      Static4D rRight = new Static4D( 10,  5, 0, 25);

      // two dynamics for interpolating through vectors of distortion. Interpolate

      // every 1000 miliseconds, indefinately ('0.0f').

      Dynamic3D dLeft = new Dynamic3D(1000,0.0f);

      Dynamic3D dRight= new Dynamic3D(1000,0.0f);

      // two vectors of distortion the left tip of the mouth gets distorted with -

      // interpolated from (0,0,0) - i.e. no distortion - to (-20,20,0), i.e.

      // slightly to the top left.

      dLeft.add ( new Static3D(  0,  0, 0) );

      dLeft.add ( new Static3D(-20, 20, 0) );

      // likewise two vectors the right tip is distorted with.

      dRight.add( new Static3D(  0,  0, 0) );

      dRight.add( new Static3D( 20, 10, 0) );

      mEffects = new DistortedEffects();

      mEffects.apply( new VertexEffectDistort(dLeft , centerLeft , rLeft ) );

      mEffects.apply( new VertexEffectDistort(dRight, centerRight, rRight) );

      mScale= new Static3D(1,1,1);

      mEffects.apply(new MatrixEffectScale(mScale));

      mScreen = new DistortedScreen();

      }

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

    public void onDrawFrame(GL10 glUnused) 

      {

      mScreen.render( System.currentTimeMillis() );

      }

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

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

      {

      float horiRatio = (float)width / mMesh.getStretchX();

      float vertRatio = (float)height/ mMesh.getStretchY();

      float factor    = horiRatio > vertRatio ? vertRatio : horiRatio;

      mScale.set( factor,factor,factor );

      mScreen.resize(width, height);

      }

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

    public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {

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

      Bitmap bitmap;

      try 

        {

        bitmap = BitmapFactory.decodeStream(is);

        } 

      finally 

        {

        try 

          {

          is.close();

          } 

        catch(IOException e) { }

        }  

      int bmpHeight = bitmap.getHeight();

      int bmpWidth  = bitmap.getWidth();

      // We could have gotten here after the activity went to the background

      // for a brief amount of time; in this case mTexture is already created.

      // Do not leak memory by creating it the second time around.

      if( mTexture==null ) mTexture = new DistortedTexture();

      // likewise the Mesh

      // This will make the Mesh stretched by bmpWidth x bmpHeight even before any effects

      // are applied to it (the Mesh - MeshRectangles - is flat, so the third parameter does not

      // not matter). bmpWight x bmpHeight is the size of the Bitmap, thus this means that we can

      // conveniently work with Effects thinking in Bitmap's native size in pixels. The origin is

      // in Bitmap's lower-left corner, thus e.g. a rotation which is meant to rotate the bitmap

      // around its center has to be centered at (bmpWidth/2, bmpHeight/2, 0).

      // Without this call, the default size of the Mesh is 1x1x0 ( or 1x1x1 in case of not-flat

      // Meshes) so we would need to be rotating around (0.5,0.5,0.0).

      if( mMesh==null )

        {

        mMesh = new MeshRectangles(9,9*bmpHeight/bmpWidth);

        mMesh.setStretch(bmpWidth,bmpHeight,0);

        }

      // even if mTexture wasn't null, we still need to call setTexture() on it

      // because every time activity goes to background, its OpenGL resources

      // - including Textures - get deleted. We always need to call setTexture()

      // to recreate the internal OpenGL textures.

      mTexture.setTexture(bitmap);

      mScreen.detachAll();

      mScreen.attach(mTexture,mEffects,mMesh);

      // All effects are by default disabled!

      VertexEffectDistort.enable();

      try

        {

        DistortedLibrary.onCreate(mView.getContext());

        }

      catch(Exception ex)

        {

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

        }

      }

}