Distorted Android

   * This bug only exists on Mali driver r12.

  private static int[] mAtomicCounter = new int[Distorted.FBO_QUEUE_SIZE];

  private static int   mCurrBuffer;

    mCurrBuffer       =  0;

    for(int i=0; i<Distorted.FBO_QUEUE_SIZE; i++)  mAtomicCounter[i] = -1;

  private static int printPreviousBuffer()

    int counter = 0;

    ByteBuffer atomicBuf = (ByteBuffer)GLES31.glMapBufferRange( GLES31.GL_ATOMIC_COUNTER_BUFFER, 0, 4,

                                                                GLES31.GL_MAP_READ_BIT);

    if( atomicBuf!=null )

      {

      IntBuffer atomicIntBuf = atomicBuf.order(ByteOrder.nativeOrder()).asIntBuffer();

      counter = atomicIntBuf.get(0);

      }

    else

      android.util.Log.e("effects", "print: failed to map atomic buffer");

    GLES31.glUnmapBuffer(GLES31.GL_ATOMIC_COUNTER_BUFFER);

    return counter;

    }

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

  private static void zeroBuffer()

    {

        GLES31.GL_MAP_WRITE_BIT|GLES31.GL_MAP_INVALIDATE_BUFFER_BIT);

      android.util.Log.e("effects", "zero: failed to map atomic buffer");

    }

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

// reset atomic counter to 0

  static int zeroOutAtomic()

    {

    int counter = 0;

    if( mAtomicCounter[0]<0 )

      {

      GLES31.glGenBuffers(Distorted.FBO_QUEUE_SIZE,mAtomicCounter,0);

      for(int i=0; i<Distorted.FBO_QUEUE_SIZE; i++)

        {

        GLES31.glBindBuffer(GLES31.GL_ATOMIC_COUNTER_BUFFER, mAtomicCounter[i]);

        GLES31.glBufferData(GLES31.GL_ATOMIC_COUNTER_BUFFER, 4, null, GLES31.GL_DYNAMIC_DRAW);

        zeroBuffer();

        }

      }

    // reading the value of the buffer on every frame would slow down rendering by

    // about 3%; doing it only once every 5 frames affects speed by less than 1%.

    if( mCurrBuffer==0 )

      {

      GLES31.glBindBufferBase(GLES31.GL_ATOMIC_COUNTER_BUFFER, 0, mAtomicCounter[mCurrBuffer]);

      counter = printPreviousBuffer();

      }

    if( ++mCurrBuffer>=Distorted.FBO_QUEUE_SIZE ) mCurrBuffer = 0;

    GLES31.glBindBufferBase(GLES31.GL_ATOMIC_COUNTER_BUFFER, 0, mAtomicCounter[mCurrBuffer]);

    zeroBuffer();

    return counter;

  static void oitClear(DistortedOutputSurface surface, int counter)

      int size = (int)(surface.mWidth*surface.mHeight*(3*mBufferSize+1)*4);

      GLES31.glBindBuffer(GLES31.GL_SHADER_STORAGE_BUFFER, 0);

      }

    // See if we have overflown the SSBO in one of the previous frames.

    // If yes, assume we need to make the SSBO larger.

    float overflow = counter/(mBufferSize*surface.mWidth*surface.mHeight);

    if( overflow>1.0f )

      {

      //android.util.Log.e("effects", "previous frame rendered "+counter+

      //                   " fragments, but there was only "+(mBufferSize*surface.mWidth*surface.mHeight)+" space");

      mBufferSize *= (int)(overflow+1.0f);

      int size = (int)(surface.mWidth*surface.mHeight*(3*mBufferSize+1)*4);

      GLES31.glBindBuffer(GLES31.GL_SHADER_STORAGE_BUFFER, mLinkedListSSBO[0]);

      GLES31.glBufferData(GLES31.GL_SHADER_STORAGE_BUFFER, size, null, GLES31.GL_DYNAMIC_READ|GLES31.GL_DYNAMIC_DRAW);

    for(int i=0; i<Distorted.FBO_QUEUE_SIZE; i++) mAtomicCounter[i] = -1;

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

  static void setSSBOSize(float size)

    {

    mBufferSize = size;

    }

public class DistortedFramebuffer extends DistortedOutputSurface

  private DistortedSurface mSurface;

    DistortedSurface input = mNumChildren[0]==0 ? mSurface : mData.mFBO;

    DistortedSurface input = mNumChildren[0]==0 ? mSurface : mData.mFBO;

    DistortedSurface input = mNumChildren[0]==0 ? mSurface : mData.mFBO;

    DistortedSurface input = mNumChildren[0]==0 ? mSurface : mData.mFBO;

  public DistortedNode(DistortedSurface surface, DistortedEffects effects, MeshObject mesh)

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

  /**

   * When rendering this Node, should we use the Order Independent Transparency render more?

   * <p>

   * There are two modes of rendering: the fast 'normal' way, which however renders transparent

   * fragments in different ways depending on which fragments get rendered first, or the slower

   * 'oit' way, which renders transparent fragments correctly regardless of their order.

   *

   * @param oit True if we want to render more slowly, but in a way which accounts for transparency.

   * @param initialSize Initial number of transparent fragments we expect, in screenfulls.

   *                    I.e '1.0' means 'the scene we are going to render contains about 1 screen

   *                    worth of transparent fragments'. Valid values: 0.0 < initialSize < 10.0

   *                    Even if you get this wrong, the library will detect that there are more

   *                    transparent fragments than it has space for and readjust its internal buffers,

   *                    but only after a few frames during which one will probably see missing objects.

   */

  public void setOrderIndependentTransparency(boolean oit, float initialSize)

    {

    mRenderWayOIT = oit;

    if( initialSize>0.0f && initialSize<10.0f )

      DistortedEffects.setSSBOSize(initialSize);

    }

  public DistortedNode attach(DistortedSurface surface, DistortedEffects effects, MeshObject mesh)

  public DistortedSurface getSurface()

    int counter = DistortedEffects.zeroOutAtomic();

    DistortedEffects.oitClear(buffer,counter);

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

/**

 * When rendering this Node, should we use the Order Independent Transparency render more?

 * <p>

 * There are two modes of rendering: the fast 'normal' way, which however renders transparent

 * fragments in different ways depending on which fragments get rendered first, or the slower

 * 'oit' way, which renders transparent fragments correctly regardless of their order.

 *

 * @param oit True if we want to render more slowly, but in a way which accounts for transparency.

 * @param initialSize Initial number of transparent fragments we expect, in screenfuls.

 *                    I.e '1.0' means 'the scene we are going to render contains about 1 screen

 *                    worth of transparent fragments'. Valid values: 0.0 < initialSize < 10.0

 *                    Even if you get this wrong, the library will detect that there are more

 *                    transparent fragments than it has space for and readjust its internal buffers,

 *                    but only after a few frames during which one will probably see missing objects.

 */

public void setOrderIndependentTransparency(boolean oit, float initialSize)

  {

  mRenderWayOIT = oit;

  if( initialSize>0.0f && initialSize<10.0f )

    DistortedEffects.setSSBOSize(initialSize);

  }

  public DistortedNode attach(DistortedSurface surface, DistortedEffects effects, MeshObject mesh)

import android.opengl.GLES31;

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

/**

 * This is not really part of the public API.

 *

 * @y.exclude

 */

public abstract class DistortedSurface extends DistortedObject

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

/**

 * Bind the underlying rectangle of pixels as a OpenGL Texture.

 *

 * @return <code>true</code> if successful.

 */

  public boolean setAsInput()

    {

    if( mColorH[0]>0 )

      {

      GLES31.glActiveTexture(GLES31.GL_TEXTURE0);

      GLES31.glBindTexture(GLES31.GL_TEXTURE_2D, mColorH[0]);

      return true;

      }

    return false;

    }

public class DistortedTexture extends DistortedSurface