Distorted Android

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// 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.sink;

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.VertexEffectSink;

import org.distorted.library.main.DistortedLibrary;

import org.distorted.library.main.DistortedEffects;

import org.distorted.library.main.DistortedScreen;

import org.distorted.library.mesh.MeshSquare;

import org.distorted.library.main.DistortedTexture;

import org.distorted.library.type.Static1D;

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 SinkRenderer implements GLSurfaceView.Renderer, DistortedLibrary.ExceptionListener

  {

  private final GLSurfaceView mView;

  private final DistortedEffects mEffects;

  private final DistortedScreen mScreen;

  private final DistortedTexture mTexture;

  private final Static3D mScale;

  private final Static1D mSinkStrength;

  private float mBmpRatio;

  private MeshSquare mMesh;

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

  SinkRenderer(GLSurfaceView v)

    { 

    mView    = v;

    mTexture = new DistortedTexture();

    mEffects = new DistortedEffects();

    mScreen  = new DistortedScreen();

    mSinkStrength = new Static1D(1.0f);

    VertexEffectSink sinkEffect = new VertexEffectSink(mSinkStrength, new Static3D(0,0,0), new Static4D(0,0,0,0.5f) );

    mEffects.apply(sinkEffect);

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

    mEffects.apply(new MatrixEffectScale(mScale));

    }

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

// logarithmic: 50 -> 1.0, 40-> A^(-1), 30->A^(-2), 70-> A^2

// where A = 5 maybe?

// f(x) = A^((level-50)/10) = e^(logA*((level-50)/10))

  float setSink(int level)

    {

    final double logA = Math.log(5);

    final float exponent = (level-50)/10.0f;

    final float value = (float)Math.exp(logA*exponent);

    mSinkStrength.set(value);

    return value;

    }

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

  public void onDrawFrame(GL10 glUnused) 

    {

    mScreen.render( System.currentTimeMillis() );

    }

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

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

    {

    if( width<height ) mScale.set( width,   width*mBmpRatio, 1 );

    else               mScale.set( height/mBmpRatio, height, 1 );

    mScreen.resize(width, height);

    }

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

  public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

    {

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

    Bitmap bitmap;

    try 

      {

      bitmap = BitmapFactory.decodeStream(is);

      } 

    finally 

      {

      try 

        {

        is.close();

        } 

      catch(IOException ignored) { }

      }  

    mBmpRatio = (float)bitmap.getHeight()/bitmap.getWidth();

    mTexture.setTexture(bitmap);

    if( mMesh==null ) mMesh = new MeshSquare(30,(int)(30*mBmpRatio));

    mScreen.detachAll();

    mScreen.attach(mTexture,mEffects,mMesh);

    VertexEffectSink.enable();

    DistortedLibrary.onSurfaceCreated(mView.getContext(), this);

    }

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

  public void distortedException(Exception ex)

    {

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

    }

  }