Distorted Android

import java.io.InputStream;

    DistortedRenderable.onDestroy();

    DistortedProjection projection = surface.getProjection();

      wx = (int)(projection.mWidth *(ndcX+1)/2);

      wy = (int)(projection.mHeight*(ndcY+1)/2);

    Matrix.translateM  ( mTmpMatrix, 0, minx-projection.mWidth/2, maxy-projection.mHeight/2, -projection.mDistance);

    Matrix.multiplyMM  ( mMVPMatrix, 0, projection.mProjectionMatrix, 0, mTmpMatrix, 0);

    DistortedProjection projection = surface.getProjection();

    GLES30.glViewport(0, 0, projection.mWidth, projection.mHeight);

      mM.send(projection,halfInputW,halfInputH,halfZ);

        mM.constructMatrices(projection,halfInputW,halfInputH);

        mBufferFBO.resizeFast(projection.mWidth, projection.mHeight);

        mM.send(mBufferFBO.getProjection(),halfInputW,halfInputH,halfZ);

        Matrix.translateM(mTmpMatrix, 0, 0, 0, -projection.mDistance);

        Matrix.multiplyMM(mMVPMatrix, 0, projection.mProjectionMatrix, 0, mTmpMatrix, 0);

        mP.render(projection.mWidth, projection.mHeight, mMVPMatrix, surface);

  static void drawNoEffectsPriv(float halfInputW, float halfInputH, MeshObject mesh, DistortedProjection projection)

public class DistortedFramebuffer extends DistortedRenderable implements DistortedInputSurface, DistortedOutputSurface

  private DistortedProjection mProjection;

// Must be called form a thread holding the OpenGL context.

    if( mProjection.resize(width,height) )

    mProjection  = new DistortedProjection(width,height);

    mProjection  = new DistortedProjection(width,height);

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

/**

 * Draw the (texture,mesh,effects) object to the Framebuffer.

 * <p>

 * Must be called from a thread holding OpenGL Context.

 *

 * @param surface InputSurface to skin our Mesh with.

 * @param mesh Class descendant from MeshObject

 * @param effects The DistortedEffects to use when rendering

 * @param time Current time, in milliseconds.

 */

  public void renderTo(DistortedInputSurface surface, MeshObject mesh, DistortedEffects effects, long time)

    {

    surface.create();  // Watch out  - this needs to be before

    create();          // the 'setAsInput' because this has side-effects!

    if( surface.setAsInput() )

      {

      DistortedRenderable.deleteAllMarked();

      effects.drawPriv(surface.getWidth()/2.0f, surface.getHeight()/2.0f, mesh, this, time);

      }

    }

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

/**

 * Draws the Tree, and all its children, to the Framebuffer.

 * <p>

 * Must be called from a thread holding OpenGL Context.

 *

 * @param dt DistortedTree to render.

 * @param time Current time, in milliseconds. This will be passed to all the Effects stored in the Tree.

 */

  public void renderTo(DistortedTree dt, long time)

    {

    DistortedRenderable.deleteAllMarked();

    create();

    dt.drawRecursive(time,this);

    }

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

/**

 * Create new Projection matrix.

 *

 * @param fov Vertical 'field of view' of the Projection frustrum (in degrees).

 * @param x X-coordinate of the point at which our camera looks at. 0 is the center.

 * @param y Y-coordinate of the point at which our camera looks at. 0 is the center.

 */

  public void setProjection(float fov, float x, float y)

    {

    mProjection.set(fov,x,y);

    mProjection.createProjection();

    }

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

/**

 * Resize the underlying Framebuffer.

 *

 * @param width The new width.

 * @param height The new height.

 */

  public void resize(int width, int height)

    {

    if( mProjection.resize(width,height) )

      {

      mSizeX = width;

      mSizeY = height;

      if( mColorH[0]>0 ) markForDeletion();

      }

    }

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

/**

 * Return Projection stored in this Framebuffer.

 *

 * @return DistortedProjection object.

 */

  public DistortedProjection getProjection()

    {

    return mProjection;

    }

public interface DistortedInputSurface extends DistortedSurface

 * A Surface that we can set as Output, i.e. render to it.

public interface DistortedOutputSurface extends DistortedSurface

{

 void setAsOutput();

 * Return the Projection.

 DistortedProjection getProjection();

}

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

// 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.library;

import android.opengl.Matrix;

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

class DistortedProjection

{

  private float mX, mY, mFOV;

  int mWidth,mHeight,mDepth;

  float mDistance;

  float[] mProjectionMatrix;

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

  DistortedProjection()

    {

    mProjectionMatrix = new float[16];

    mWidth = 0;

    mHeight= 0;

    mFOV = 60.0f;

    mX   =  0.0f;

    mY   =  0.0f;

    }

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

  DistortedProjection(int width, int height)

    {

    mProjectionMatrix = new float[16];

    mWidth = width;

    mHeight= height;

    mFOV = 60.0f;

    mX   =  0.0f;

    mY   =  0.0f;

    createProjection();

    }

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

  boolean resize(int width, int height)

    {

    if( mWidth!=width || mHeight!=height )

      {

      mWidth = width;

      mHeight= height;

      createProjection();

      return true;

      }

    return false;

    }

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

  void set(float fov, float x, float y)

    {

    mFOV = fov;

    mX = x;

    mY = y;

    }

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

  void createProjection()

    {

    if( mWidth>0 && mHeight>1 )

      {

      if( mFOV>0.0f )  // perspective projection

        {

        float left   = (-mX-mWidth /2.0f)/mHeight;

        float right  = (-mX+mWidth /2.0f)/mHeight;

        float bottom = (-mY-mHeight/2.0f)/mHeight;

        float top    = (-mY+mHeight/2.0f)/mHeight;

        float near   = (top-bottom) / (2.0f*(float)Math.tan(mFOV*Math.PI/360));

        mDistance    = mHeight*near/(top-bottom);

        float far    = 2*mDistance-near;

        mDepth       = (int)((far-near)/2);

        Matrix.frustumM(mProjectionMatrix, 0, left, right, bottom, top, near, far);

        }

      else             // parallel projection

        {

        float left   = -mX-mWidth /2.0f;

        float right  = -mX+mWidth /2.0f;

        float bottom = -mY-mHeight/2.0f;

        float top    = -mY+mHeight/2.0f;

        float near   = (mWidth+mHeight)/2;

        mDistance    = 2*near;

        float far    = 3*near;

        mDepth       = (int)near;

        Matrix.orthoM(mProjectionMatrix, 0, left, right, bottom, top, near, far);

        }

      }

    }

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

}

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

// 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.library;

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 DistortedRenderable implements 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<DistortedRenderable> 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 )

      {

      DistortedRenderable tmp;

      Iterator<DistortedRenderable> 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( DistortedRenderable ren : mList)

      {

      ren.destroy();

      ren.mMarked = false;

      }

    mListMarked = false;

    }

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

  DistortedRenderable(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 Renderable.

 */

  public long getID()

    {

    return mColorH[0];

    }

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

/**

 * Returns the height of the Renderable.

 *

 * @return height of the object, in pixels.

 */

  public int getWidth()

    {

    return mSizeX;

    }

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

/**

 * Returns the width of the Renderable.

 *

 * @return width of the Object, in pixels.

 */

  public int getHeight()

    {

    return mSizeY;

    }

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

/**

 * Returns the depth of the Renderable.

 * <p>

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

 * 'depth' of a Renderable (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);

    }

  }

public class DistortedScreen extends DistortedRenderable implements DistortedOutputSurface

  private int[] mFBOH   = new int[1];

  private DistortedProjection mProjection;

    mProjection  = new DistortedProjection();

    mFBOH[0]     = 0;

    GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, mFBOH[0]);

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

/**

 * Draw the (texture,mesh,effects) object to the Framebuffer.

 * <p>

 * Must be called from a thread holding OpenGL Context.

 *

 * @param surface InputSurface to skin our Mesh with.

 * @param mesh Class descendant from MeshObject

 * @param effects The DistortedEffects to use when rendering

 * @param time Current time, in milliseconds.

 */

  public void renderTo(DistortedInputSurface surface, MeshObject mesh, DistortedEffects effects, long time)

    {

    surface.create();  // Watch out  - this needs to be before

    create();          // the 'setAsInput' because this has side-effects!

    if( surface.setAsInput() )

      {

      DistortedRenderable.deleteAllMarked();

      effects.drawPriv(surface.getWidth()/2.0f, surface.getHeight()/2.0f, mesh, this, time);

      }

    }

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

/**

 * Draws the Tree, and all its children, to the Framebuffer.

 * <p>

 * Must be called from a thread holding OpenGL Context.

 *

 * @param dt DistortedTree to render.

 * @param time Current time, in milliseconds. This will be passed to all the Effects stored in the Tree.

 */

  public void renderTo(DistortedTree dt, long time)

    {

    DistortedRenderable.deleteAllMarked();

    create();

    dt.drawRecursive(time,this);

    }

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

/**

 * Create new Projection matrix.

 *

 * @param fov Vertical 'field of view' of the Projection frustrum (in degrees).

 * @param x X-coordinate of the point at which our camera looks at. 0 is the center.

 * @param y Y-coordinate of the point at which our camera looks at. 0 is the center.

 */

  public void setProjection(float fov, float x, float y)

    {

    mProjection.set(fov,x,y);

    mProjection.createProjection();

    }

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

/**

 * Resize the underlying Projection.

 *

 * @param width The new width.

 * @param height The new height.

 */

  public void resize(int width, int height)

    {

    if( mProjection.resize(width,height) )

      {

      mSizeX = width;

      mSizeY = height;

      }

    }

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

/**

 * Return Projection stored in this Framebuffer.

 *

 * @return DistortedProjection object.

 */

  public DistortedProjection getProjection()

    {

    return mProjection;

    }

 * Abstract Surface.

interface DistortedSurface

{

 * Create the underlying OpenGL part of the Surface.

  void create();

 * Return a unique ID of this Surface.

  long getID();

 * Return the width of this Surface.

  int getWidth();

 * Return the height of this Surface.

  int getHeight();

}

public class DistortedTexture extends DistortedRenderable implements DistortedInputSurface

          DistortedEffects.drawNoEffectsPriv(halfX, halfY, mMesh, mData.mFBO.getProjection() );

  void constructMatrices(DistortedProjection projection, float halfX, float halfY)

  synchronized void send(DistortedProjection projection, float halfX, float halfY, float halfZ)

  synchronized static void sendZero(DistortedProjection projection, float halfX, float halfY, float halfZ)

    DistortedProjection inputP  = mBufferFBO.getProjection();

    DistortedProjection outputP = surface.getProjection();

    Matrix.translateM(mTmpMatrix, 0, 0, 0, -inputP.mDistance);

    Matrix.multiplyMM(mMVPMatrix, 0, inputP.mProjectionMatrix, 0, mTmpMatrix, 0);

    GLES30.glViewport(0, 0, outputP.mWidth, outputP.mHeight);