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.projection;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

import org.distorted.library.effect.VertexEffectDistort;

import org.distorted.library.main.Distorted;

import org.distorted.library.main.DistortedEffects;

import org.distorted.library.main.DistortedScreen;

import org.distorted.library.mesh.MeshFlat;

import org.distorted.library.main.DistortedTexture;

import org.distorted.library.type.Static3D;

import org.distorted.library.type.Static4D;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.opengl.GLSurfaceView;

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

class ProjectionRenderer implements GLSurfaceView.Renderer

{

   private GLSurfaceView mView;

   private DistortedEffects mEffects;

   private DistortedScreen mScreen;

   private MeshFlat mMesh;

   private DistortedTexture mTexture;

   private float mF, mNear;

   private Static3D mVector, mPoint1, mPoint2, mPoint3, mPoint4;

   private Static4D mRegion;

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

   ProjectionRenderer(GLSurfaceView view)

      { 

      mView   = view;

      mEffects= new DistortedEffects();

      mScreen = new DistortedScreen();

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

      mPoint1 = new Static3D(0,0,0);

      mPoint2 = new Static3D(0,0,0);

      mPoint3 = new Static3D(0,0,0);

      mPoint4 = new Static3D(0,0,0);

      mRegion = new Static4D(0,0,0,0);

      mEffects.apply( new VertexEffectDistort(mVector, mPoint1, mRegion) );

      mEffects.apply( new VertexEffectDistort(mVector, mPoint2, mRegion) );

      mEffects.apply( new VertexEffectDistort(mVector, mPoint3, mRegion) );

      mEffects.apply( new VertexEffectDistort(mVector, mPoint4, mRegion) );

      }

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

   float setFOV(int f)

      {

      mF = f;

      mScreen.setProjection(mF,mNear);

      return mF;

      }

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

   float setNear(int near)

      {

      mNear = near/100.0f;

      mScreen.setProjection(mF,mNear);

      return mNear;

      }

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

   public void onDrawFrame(GL10 glUnused) 

      {

      mScreen.render( System.currentTimeMillis() );

      }

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

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

      {

      mScreen.setProjection(mF,mNear);

      Paint paint = new Paint();

      Bitmap bmp  = Bitmap.createBitmap(width,height, Bitmap.Config.ARGB_8888);

      Canvas bmpCanvas = new Canvas(bmp);

      paint.setColor(0xff008800);

      paint.setStyle(Style.FILL);

      bmpCanvas.drawRect(0, 0, width, height, paint);

      paint.setColor(0xffffffff);

      final int NUMLINES = 10;

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

        {

        bmpCanvas.drawRect(width*i/NUMLINES - 1,                    0,  width*i/NUMLINES + 1,  height               , paint);

        bmpCanvas.drawRect(                   0, height*i/NUMLINES -1,  width               ,  height*i/NUMLINES + 1, paint);

        }

      int min = width<height ? width:height;

      mVector.set(0,0,min/5);

      mRegion.set(0,0,min/5,min/5);

      mPoint1.set(  width/4,   height/4, 0);

      mPoint2.set(3*width/4,   height/4, 0);

      mPoint3.set(  width/4, 3*height/4, 0);

      mPoint4.set(3*width/4, 3*height/4, 0);

      // Avoid memory leaks: delete old texture if it exists (it might if we

      // got here after a brief amount of time spent in the background)

      if( mTexture!=null ) mTexture.markForDeletion();

      mTexture= new DistortedTexture(width,height);

      mTexture.setTexture(bmp);

      // likewise with the Mesh

      if( mMesh!=null ) mMesh.markForDeletion();

      mMesh = new MeshFlat(100,100*height/width);

      mScreen.detachAll();

      mScreen.attach(mTexture,mEffects,mMesh);

      mScreen.resize(width, height);

      }

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

   public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {

      VertexEffectDistort.enable();

      try

        {

        Distorted.onCreate(mView.getContext());

        }

      catch(Exception ex)

        {

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

        }

      }

}