Distorted Android

import java.util.Iterator;

import java.util.LinkedList;

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

/**

 * Keep all objects created in a static LinkedList. The point: we need to be able to mark

 * Objects for deletion, and delete all marked Objects later at a convenient time (that's

 * because we can only delete from a thread that holds the OpenGL context so here we provide a

 * framework where one is able to mark for deletion at any time and actual deletion takes place

 * on the next render).

*/

abstract class DistortedSurface

  {

  static final int FAILED_TO_CREATE = -1;

  static final int NOT_CREATED_YET  = -2;

  static final int DONT_CREATE      = -3;

  private static boolean mListMarked = false;

  private static LinkedList<DistortedSurface> mList = new LinkedList<>();

  private boolean mMarked;

  int[] mColorH = new int[1];

  int mSizeX, mSizeY;  // in screen space

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

  public abstract void create();

  abstract void delete();

  abstract void destroy();

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

// must be called form a thread holding OpenGL Context

  static synchronized void deleteAllMarked()

    {

    if( mListMarked )

      {

      DistortedSurface tmp;

      Iterator<DistortedSurface> iterator = mList.iterator();

      while(iterator.hasNext())

        {

        tmp = iterator.next();

        if( tmp.mMarked )

          {

          tmp.delete();

          tmp.mMarked = false;

          iterator.remove();

          }

        }

      mListMarked = false;

      }

    }

  static synchronized void onDestroy()

    {

    for( DistortedSurface ren : mList)

      {

      ren.destroy();

      ren.mMarked = false;

      }

    mListMarked = false;

    }

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

  DistortedSurface(int width, int height, int color)

    {

    mSizeX    = width ;

    mSizeY    = height;

    mColorH[0]= color;

    mMarked   = false;

    mList.add(this);

    }

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

// PUBLIC API

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

 * Mark the underlying OpenGL object for deletion. Actual deletion will take place on the next render.

  public void markForDeletion()

    {

    mListMarked = true;

    mMarked     = true;

    }

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

 * Return unique ID of the Surface.

  public long getID()

    {

    return mColorH[0];

    }

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

 * Returns the height of the Surface.

 *

 * @return height of the object, in pixels.

  public int getWidth()

    {

    return mSizeX;

    }

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

 * Returns the width of the Surface.

 *

 * @return width of the Object, in pixels.

  public int getHeight()

    {

    return mSizeY;

    }

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

 * Returns the depth of the Surface.

 * <p>

 * Admittedly quite a strange method. Why do we need to pass a Mesh to it? Because one cannot determine

 * 'depth' of a Surface (bitmap really!) when rendered based only on the texture itself, that depends

 * on the Mesh it is rendered with.

 *

 * @return depth of the Object, in pixels.

  public int getDepth(MeshObject mesh)

    {

    return mesh==null ? 0 : (int)(mSizeX*mesh.zFactor);

    }

  }