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.library;

import android.content.res.Resources;

import android.opengl.GLES30;

import android.opengl.Matrix;

import org.distorted.library.message.EffectListener;

import org.distorted.library.program.DistortedProgram;

import org.distorted.library.program.FragmentCompilationException;

import org.distorted.library.program.FragmentUniformsException;

import org.distorted.library.program.LinkingException;

import org.distorted.library.program.VertexCompilationException;

import org.distorted.library.program.VertexUniformsException;

import org.distorted.library.type.Data1D;

import org.distorted.library.type.Data2D;

import org.distorted.library.type.Data3D;

import org.distorted.library.type.Data4D;

import org.distorted.library.type.Data5D;

import org.distorted.library.type.Static3D;

import java.io.InputStream;

import java.nio.Buffer;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

import java.nio.FloatBuffer;

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

/**

 * Class containing Matrix,Vertex and Fragment effect queues. Postprocessing queue is held in a separate

 * class.

 * <p>

 * The queues hold actual effects to be applied to a given (DistortedTexture,MeshObject) combo.

 */

public class DistortedEffects

  {

  /// MAIN PROGRAM ///

  private static DistortedProgram mMainProgram;

  private static int mMainTextureH;

  private static boolean[] mEffectEnabled = new boolean[EffectNames.size()];

  static

    {

    int len = EffectNames.size();

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

      {

      mEffectEnabled[i] = false;

      }

    }

  /// BLIT PROGRAM ///

  private static DistortedProgram mBlitProgram;

  private static int mBlitTextureH;

  private static int mBlitDepthH;

  private static final FloatBuffer mQuadPositions;

  static

    {

    float[] positionData= { -0.5f, -0.5f,  -0.5f, 0.5f,  0.5f,-0.5f,  0.5f, 0.5f };

    mQuadPositions = ByteBuffer.allocateDirect(32).order(ByteOrder.nativeOrder()).asFloatBuffer();

    mQuadPositions.put(positionData).position(0);

    }

  /// DEBUG ONLY /////

  private static DistortedProgram mDebugProgram;

  private static int mDebugObjDH;

  private static int mDebugMVPMatrixH;

  /// END DEBUG //////

  private static float[] mMVPMatrix = new float[16];

  private static float[] mTmpMatrix = new float[16];

  private static long mNextID =0;

  private long mID;

  private EffectQueueMatrix      mM;

  private EffectQueueFragment    mF;

  private EffectQueueVertex      mV;

  private boolean matrixCloned, vertexCloned, fragmentCloned;

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

  static void createProgram(Resources resources)

  throws FragmentCompilationException,VertexCompilationException,VertexUniformsException,FragmentUniformsException,LinkingException

    {

    // MAIN PROGRAM ////////////////////////////////////

    final InputStream mainVertStream = resources.openRawResource(R.raw.main_vertex_shader);

    final InputStream mainFragStream = resources.openRawResource(R.raw.main_fragment_shader);

    String mainVertHeader= Distorted.GLSL_VERSION;

    String mainFragHeader= Distorted.GLSL_VERSION;

    EffectNames name;

    EffectTypes type;

    boolean foundF = false;

    boolean foundV = false;

    for(int i=0; i<mEffectEnabled.length; i++)

      {

      if( mEffectEnabled[i] )

        {

        name = EffectNames.getName(i);

        type = EffectNames.getType(i);

        if( type == EffectTypes.VERTEX )

          {

          mainVertHeader += ("#define "+name.name()+" "+name.ordinal()+"\n");

          foundV = true;

          }

        else if( type == EffectTypes.FRAGMENT )

          {

          mainFragHeader += ("#define "+name.name()+" "+name.ordinal()+"\n");

          foundF = true;

          }

        }

      }

    mainVertHeader += ("#define NUM_VERTEX "   + ( foundV ? getMaxVertex()   : 0 ) + "\n");

    mainFragHeader += ("#define NUM_FRAGMENT " + ( foundF ? getMaxFragment() : 0 ) + "\n");

    //android.util.Log.e("Effects", "vertHeader= "+mainVertHeader);

    //android.util.Log.e("Effects", "fragHeader= "+mainFragHeader);

    String[] feedback = { "v_Position","v_Normal","v_TexCoordinate" };

    mMainProgram = new DistortedProgram(mainVertStream,mainFragStream, mainVertHeader, mainFragHeader, Distorted.GLSL, feedback);

    int mainProgramH = mMainProgram.getProgramHandle();

    EffectQueueFragment.getUniforms(mainProgramH);

    EffectQueueVertex.getUniforms(mainProgramH);

    EffectQueueMatrix.getUniforms(mainProgramH);

    mMainTextureH= GLES30.glGetUniformLocation( mainProgramH, "u_Texture");

    // BLIT PROGRAM ////////////////////////////////////

    final InputStream blitVertStream = resources.openRawResource(R.raw.blit_vertex_shader);

    final InputStream blitFragStream = resources.openRawResource(R.raw.blit_fragment_shader);

    String blitVertHeader= (Distorted.GLSL_VERSION + "#define NUM_VERTEX 0\n"  );

    String blitFragHeader= (Distorted.GLSL_VERSION + "#define NUM_FRAGMENT 0\n");

    try

      {

      mBlitProgram = new DistortedProgram(blitVertStream,blitFragStream,blitVertHeader,blitFragHeader, Distorted.GLSL);

      }

    catch(Exception e)

      {

      android.util.Log.e("EFFECTS", "exception trying to compile BLIT program: "+e.getMessage());

      throw new RuntimeException(e.getMessage());

      }

    int blitProgramH = mBlitProgram.getProgramHandle();

    mBlitTextureH  = GLES30.glGetUniformLocation( blitProgramH, "u_Texture");

    mBlitDepthH    = GLES30.glGetUniformLocation( blitProgramH, "u_Depth");

    // DEBUG PROGRAM //////////////////////////////////////

    final InputStream debugVertexStream   = resources.openRawResource(R.raw.test_vertex_shader);

    final InputStream debugFragmentStream = resources.openRawResource(R.raw.test_fragment_shader);

    try

      {

      mDebugProgram = new DistortedProgram(debugVertexStream,debugFragmentStream, Distorted.GLSL_VERSION, Distorted.GLSL_VERSION, Distorted.GLSL);

      }

    catch(Exception e)

      {

      android.util.Log.e("EFFECTS", "exception trying to compile DEBUG program: "+e.getMessage());

      throw new RuntimeException(e.getMessage());

      }

    int debugProgramH = mDebugProgram.getProgramHandle();

    mDebugObjDH      = GLES30.glGetUniformLocation( debugProgramH, "u_objD");

    mDebugMVPMatrixH = GLES30.glGetUniformLocation( debugProgramH, "u_MVPMatrix");

    }

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

  private void initializeEffectLists(DistortedEffects d, int flags)

    {

    if( (flags & Distorted.CLONE_MATRIX) != 0 )

      {

      mM = d.mM;

      matrixCloned = true;

      }

    else

      {

      mM = new EffectQueueMatrix(mID);

      matrixCloned = false;

      }

    if( (flags & Distorted.CLONE_VERTEX) != 0 )

      {

      mV = d.mV;

      vertexCloned = true;

      }

    else

      {

      mV = new EffectQueueVertex(mID);

      vertexCloned = false;

      }

    if( (flags & Distorted.CLONE_FRAGMENT) != 0 )

      {

      mF = d.mF;

      fragmentCloned = true;

      }

    else

      {

      mF = new EffectQueueFragment(mID);

      fragmentCloned = false;

      }

    }

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

// DEBUG ONLY

  @SuppressWarnings("unused")

  private void displayBoundingRect(float halfX, float halfY, float halfZ, DistortedOutputSurface surface, float[] mvp, float[] vertices, long currTime)

    {

    int len  = vertices.length/3;

    int minx = Integer.MAX_VALUE;

    int maxx = Integer.MIN_VALUE;

    int miny = Integer.MAX_VALUE;

    int maxy = Integer.MIN_VALUE;

    int wx,wy;

    float x,y,z, X,Y,W, ndcX,ndcY;

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

      {

      x = 2*halfX*vertices[3*i  ];

      y = 2*halfY*vertices[3*i+1];

      z = 2*halfZ*vertices[3*i+2];

      X = mvp[ 0]*x + mvp[ 4]*y + mvp[ 8]*z + mvp[12];

      Y = mvp[ 1]*x + mvp[ 5]*y + mvp[ 9]*z + mvp[13];

      W = mvp[ 3]*x + mvp[ 7]*y + mvp[11]*z + mvp[15];

      ndcX = X/W;

      ndcY = Y/W;

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

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

      if( wx<minx ) minx = wx;

      if( wx>maxx ) maxx = wx;

      if( wy<miny ) miny = wy;

      if( wy>maxy ) maxy = wy;

      }

    mDebugProgram.useProgram();

    surface.setAsOutput(currTime);

    Matrix.setIdentityM( mTmpMatrix, 0);

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

    Matrix.scaleM      ( mTmpMatrix, 0, (float)(maxx-minx)/(2*halfX), (float)(maxy-miny)/(2*halfY), 1.0f);

    Matrix.translateM  ( mTmpMatrix, 0, halfX,-halfY, 0);

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

    GLES30.glUniform2f(mDebugObjDH, 2*halfX, 2*halfY);

    GLES30.glUniformMatrix4fv(mDebugMVPMatrixH, 1, false, mMVPMatrix , 0);

    GLES30.glVertexAttribPointer(mDebugProgram.mAttribute[0], 2, GLES30.GL_FLOAT, false, 0, mQuadPositions);

    GLES30.glDrawArrays(GLES30.GL_TRIANGLE_STRIP, 0, 4);

    }

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

  private void displayTransformFeedback(MeshObject mesh)

    {

    GLES30.glBindBufferBase(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, mesh.mAttTFO[0]);

    GLES30.glBeginTransformFeedback( GLES30.GL_POINTS);

    DistortedRenderState.switchOffDrawing();

    GLES30.glDrawArrays( GLES30.GL_POINTS, 0, mesh.numVertices);

    DistortedRenderState.restoreDrawing();

    int error = GLES30.glGetError();

      if( error != GLES30.GL_NO_ERROR )

        {

        throw new RuntimeException("DrawArrays: glError 0x" + Integer.toHexString(error));

        }

/*

    int size = (MeshObject.POS_DATA_SIZE+MeshObject.NOR_DATA_SIZE+MeshObject.TEX_DATA_SIZE)*mesh.numVertices;

    Buffer mappedBuffer =  GLES30.glMapBufferRange(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, 4*size, GLES30.GL_MAP_READ_BIT);

    FloatBuffer fb = ((ByteBuffer) mappedBuffer).order(ByteOrder.nativeOrder()).asFloatBuffer();

    String msg = "";

    for(int i=0; i<size; i++) msg += (" "+fb.get(i));

    android.util.Log.d( "Feedback", msg);

    GLES30.glUnmapBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER);

*/

    GLES30.glEndTransformFeedback();

    GLES30.glBindBufferBase(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, 0);

    }

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

  void drawPriv(float halfW, float halfH, MeshObject mesh, DistortedOutputSurface surface, long currTime)

    {

    mM.compute(currTime);

    mV.compute(currTime);

    mF.compute(currTime);

    float halfZ = halfW*mesh.zFactor;

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

    mMainProgram.useProgram();

    surface.setAsOutput(currTime);

    GLES30.glUniform1i(mMainTextureH, 0);

    GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mesh.mAttVBO[0]);

    GLES30.glVertexAttribPointer(mMainProgram.mAttribute[0], MeshObject.POS_DATA_SIZE, GLES30.GL_FLOAT, false, MeshObject.VERTSIZE, MeshObject.OFFSET0);

    GLES30.glVertexAttribPointer(mMainProgram.mAttribute[1], MeshObject.NOR_DATA_SIZE, GLES30.GL_FLOAT, false, MeshObject.VERTSIZE, MeshObject.OFFSET1);

    GLES30.glVertexAttribPointer(mMainProgram.mAttribute[2], MeshObject.TEX_DATA_SIZE, GLES30.GL_FLOAT, false, MeshObject.VERTSIZE, MeshObject.OFFSET2);

    GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, 0 );

    mM.send(surface,halfW,halfH,halfZ);

    mV.send(halfW,halfH,halfZ);

    displayTransformFeedback(mesh);

    EffectQueueMatrix.sendZero();

    EffectQueueVertex.sendZero();

    mF.send(halfW,halfH);

    GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mesh.mAttTFO[0]);

    GLES30.glVertexAttribPointer(mMainProgram.mAttribute[0], MeshObject.POS_DATA_SIZE, GLES30.GL_FLOAT, false, MeshObject.VERTSIZE, MeshObject.OFFSET0);

    GLES30.glVertexAttribPointer(mMainProgram.mAttribute[1], MeshObject.NOR_DATA_SIZE, GLES30.GL_FLOAT, false, MeshObject.VERTSIZE, MeshObject.OFFSET1);

    GLES30.glVertexAttribPointer(mMainProgram.mAttribute[2], MeshObject.TEX_DATA_SIZE, GLES30.GL_FLOAT, false, MeshObject.VERTSIZE, MeshObject.OFFSET2);

    GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, 0 );

    GLES30.glDrawArrays(GLES30.GL_TRIANGLE_STRIP, 0, mesh.numVertices);

    /// DEBUG ONLY //////

    // displayBoundingRect(halfW, halfH, halfZ, surface, mM.getMVP(), mesh.getBoundingVertices() );

    /// END DEBUG ///////

    }

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

  static void blitPriv(DistortedOutputSurface surface)

    {

    mBlitProgram.useProgram();

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

    GLES30.glUniform1i(mBlitTextureH, 0);

    GLES30.glUniform1f( mBlitDepthH , 1.0f-surface.mNear);

    GLES30.glVertexAttribPointer(mBlitProgram.mAttribute[0], 2, GLES30.GL_FLOAT, false, 0, mQuadPositions);

    GLES30.glDrawArrays(GLES30.GL_TRIANGLE_STRIP, 0, 4);

    }

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

  private void releasePriv()

    {

    if( !matrixCloned     ) mM.abortAll(false);

    if( !vertexCloned     ) mV.abortAll(false);

    if( !fragmentCloned   ) mF.abortAll(false);

    mM = null;

    mV = null;

    mF = null;

    }

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

  static void onDestroy()

    {

    mNextID = 0;

    int len = EffectNames.size();

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

      {

      mEffectEnabled[i] = false;

      }

    }

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

// PUBLIC API

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

/**

 * Create empty effect queue.

 */

  public DistortedEffects()

    {

    mID = ++mNextID;

    initializeEffectLists(this,0);

    }

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

/**

 * Copy constructor.

 * <p>

 * Whatever we do not clone gets created just like in the default constructor.

 *

 * @param dc    Source object to create our object from

 * @param flags A bitmask of values specifying what to copy.

 *              For example, CLONE_VERTEX | CLONE_MATRIX.

 */

  public DistortedEffects(DistortedEffects dc, int flags)

    {

    mID = ++mNextID;

    initializeEffectLists(dc,flags);

    }

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

/**

 * Releases all resources. After this call, the queue should not be used anymore.

 */

  @SuppressWarnings("unused")

  public synchronized void delete()

    {

    releasePriv();

    }

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

/**

 * Returns unique ID of this instance.

 *

 * @return ID of the object.

 */

  public long getID()

      {

      return mID;

      }

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

/**

 * Adds the calling class to the list of Listeners that get notified each time some event happens 

 * to one of the Effects in those queues. Nothing will happen if 'el' is already in the list.

 * 

 * @param el A class implementing the EffectListener interface that wants to get notifications.

 */

  @SuppressWarnings("unused")

  public void registerForMessages(EffectListener el)

    {

    mV.registerForMessages(el);

    mF.registerForMessages(el);

    mM.registerForMessages(el);

    }

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

/**

 * Removes the calling class from the list of Listeners.

 * 

 * @param el A class implementing the EffectListener interface that no longer wants to get notifications.

 */

  @SuppressWarnings("unused")

  public void deregisterForMessages(EffectListener el)

    {

    mV.deregisterForMessages(el);

    mF.deregisterForMessages(el);

    mM.deregisterForMessages(el);

    }

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

/**

 * Aborts all Effects.

 * @return Number of effects aborted.

 */

  public int abortAllEffects()

    {

    return mM.abortAll(true) + mV.abortAll(true) + mF.abortAll(true);

    }

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

/**

 * Aborts all Effects of a given type, for example all MATRIX Effects.

 * 

 * @param type one of the constants defined in {@link EffectTypes}

 * @return Number of effects aborted.

 */

  public int abortEffects(EffectTypes type)

    {

    switch(type)

      {

      case MATRIX     : return mM.abortAll(true);

      case VERTEX     : return mV.abortAll(true);

      case FRAGMENT   : return mF.abortAll(true);

      default         : return 0;

      }

    }

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

/**

 * Aborts a single Effect.

 * 

 * @param id ID of the Effect we want to abort.

 * @return number of Effects aborted. Always either 0 or 1.

 */

  public int abortEffect(long id)

    {

    int type = (int)(id&EffectTypes.MASK);

    if( type==EffectTypes.MATRIX.type      ) return mM.removeByID(id>>EffectTypes.LENGTH);

    if( type==EffectTypes.VERTEX.type      ) return mV.removeByID(id>>EffectTypes.LENGTH);

    if( type==EffectTypes.FRAGMENT.type    ) return mF.removeByID(id>>EffectTypes.LENGTH);

    return 0;

    }

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

/**

 * Abort all Effects of a given name, for example all rotations.

 * 

 * @param name one of the constants defined in {@link EffectNames}

 * @return number of Effects aborted.

 */

  public int abortEffects(EffectNames name)

    {

    switch(name.getType())

      {

      case MATRIX     : return mM.removeByType(name);

      case VERTEX     : return mV.removeByType(name);

      case FRAGMENT   : return mF.removeByType(name);

      default         : return 0;

      }

    }

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

/**

 * Print some info about a given Effect to Android's standard out. Used for debugging only.

 * 

 * @param id Effect ID we want to print info about

 * @return <code>true</code> if a single Effect of type effectType has been found.

 */

  @SuppressWarnings("unused")

  public boolean printEffect(long id)

    {

    int type = (int)(id&EffectTypes.MASK);

    if( type==EffectTypes.MATRIX.type  )  return mM.printByID(id>>EffectTypes.LENGTH);

    if( type==EffectTypes.VERTEX.type  )  return mV.printByID(id>>EffectTypes.LENGTH);

    if( type==EffectTypes.FRAGMENT.type)  return mF.printByID(id>>EffectTypes.LENGTH);

    return false;

    }

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

/**

 * Enables a given Effect.

 * <p>

 * By default, all effects are disabled. One has to explicitly enable each effect one intends to use.

 * This needs to be called BEFORE shaders get compiled, i.e. before the call to Distorted.onCreate().

 * The point: by enabling only the effects we need, we can optimize the shaders.

 *

 * @param name Name of the Effect to enable.

 */

  public static void enableEffect(EffectNames name)

    {

    mEffectEnabled[name.ordinal()] = true;

    }

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

/**

 * Returns the maximum number of Matrix effects.

 *

 * @return The maximum number of Matrix effects

 */

  @SuppressWarnings("unused")

  public static int getMaxMatrix()

    {

    return EffectQueue.getMax(EffectTypes.MATRIX.ordinal());

    }

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

/**

 * Returns the maximum number of Vertex effects.

 *

 * @return The maximum number of Vertex effects

 */

  @SuppressWarnings("unused")

  public static int getMaxVertex()

    {

    return EffectQueue.getMax(EffectTypes.VERTEX.ordinal());

    }

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

/**

 * Returns the maximum number of Fragment effects.

 *

 * @return The maximum number of Fragment effects

 */

  @SuppressWarnings("unused")

  public static int getMaxFragment()

    {

    return EffectQueue.getMax(EffectTypes.FRAGMENT.ordinal());

    }

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

/**

 * Sets the maximum number of Matrix effects that can be stored in a single EffectQueue at one time.

 * This can fail if:

 * <ul>

 * <li>the value of 'max' is outside permitted range (0 &le; max &le; Byte.MAX_VALUE)

 * <li>We try to increase the value of 'max' when it is too late to do so already. It needs to be called

 *     before the Vertex Shader gets compiled, i.e. before the call to {@link Distorted#onCreate}. After this

 *     time only decreasing the value of 'max' is permitted.

 * <li>Furthermore, this needs to be called before any instances of the DistortedEffects class get created.

 * </ul>

 *

 * @param max new maximum number of simultaneous Matrix Effects. Has to be a non-negative number not greater

 *            than Byte.MAX_VALUE

 * @return <code>true</code> if operation was successful, <code>false</code> otherwise.

 */

  @SuppressWarnings("unused")

  public static boolean setMaxMatrix(int max)

    {

    return EffectQueue.setMax(EffectTypes.MATRIX.ordinal(),max);

    }

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

/**

 * Sets the maximum number of Vertex effects that can be stored in a single EffectQueue at one time.

 * This can fail if:

 * <ul>

 * <li>the value of 'max' is outside permitted range (0 &le; max &le; Byte.MAX_VALUE)

 * <li>We try to increase the value of 'max' when it is too late to do so already. It needs to be called

 *     before the Vertex Shader gets compiled, i.e. before the call to {@link Distorted#onCreate}. After this

 *     time only decreasing the value of 'max' is permitted.

* <li>Furthermore, this needs to be called before any instances of the DistortedEffects class get created.

 * </ul>

 *

 * @param max new maximum number of simultaneous Vertex Effects. Has to be a non-negative number not greater

 *            than Byte.MAX_VALUE

 * @return <code>true</code> if operation was successful, <code>false</code> otherwise.

 */

  @SuppressWarnings("unused")

  public static boolean setMaxVertex(int max)

    {

    return EffectQueue.setMax(EffectTypes.VERTEX.ordinal(),max);

    }

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

/**

 * Sets the maximum number of Fragment effects that can be stored in a single EffectQueue at one time.

 * This can fail if:

 * <ul>

 * <li>the value of 'max' is outside permitted range (0 &le; max &le; Byte.MAX_VALUE)

 * <li>We try to increase the value of 'max' when it is too late to do so already. It needs to be called

 *     before the Fragment Shader gets compiled, i.e. before the call to {@link Distorted#onCreate}. After this

 *     time only decreasing the value of 'max' is permitted.

 * <li>Furthermore, this needs to be called before any instances of the DistortedEffects class get created.

 * </ul>

 *

 * @param max new maximum number of simultaneous Fragment Effects. Has to be a non-negative number not greater

 *            than Byte.MAX_VALUE

 * @return <code>true</code> if operation was successful, <code>false</code> otherwise.

 */

  @SuppressWarnings("unused")

  public static boolean setMaxFragment(int max)

    {

    return EffectQueue.setMax(EffectTypes.FRAGMENT.ordinal(),max);

    }

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

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

// Individual effect functions.

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

// Matrix-based effects

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

/**

 * Moves the Object by a (possibly changing in time) vector.

 * 

 * @param vector 3-dimensional Data which at any given time will return a Static3D

 *               representing the current coordinates of the vector we want to move the Object with.

 * @return       ID of the effect added, or -1 if we failed to add one.

 */

  public long move(Data3D vector)

    {   

    return mM.add(EffectNames.MOVE,vector);

    }

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

/**

 * Scales the Object by (possibly changing in time) 3D scale factors.

 * 

 * @param scale 3-dimensional Data which at any given time returns a Static3D

 *              representing the current x- , y- and z- scale factors.

 * @return      ID of the effect added, or -1 if we failed to add one.

 */

  public long scale(Data3D scale)

    {   

    return mM.add(EffectNames.SCALE,scale);

    }

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

/**

 * Scales the Object by one uniform, constant factor in all 3 dimensions. Convenience function.

 *

 * @param scale The factor to scale all 3 dimensions with.

 * @return      ID of the effect added, or -1 if we failed to add one.

 */

  public long scale(float scale)

    {

    return mM.add(EffectNames.SCALE, new Static3D(scale,scale,scale));

    }

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

/**

 * Rotates the Object by 'angle' degrees around the center.

 * Static axis of rotation is given by the last parameter.

 *

 * @param angle  Angle that we want to rotate the Object to. Unit: degrees

 * @param axis   Axis of rotation

 * @param center Coordinates of the Point we are rotating around.

 * @return       ID of the effect added, or -1 if we failed to add one.

 */

  public long rotate(Data1D angle, Static3D axis, Data3D center )

    {   

    return mM.add(EffectNames.ROTATE, angle, axis, center);

    }

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

/**

 * Rotates the Object by 'angle' degrees around the center.

 * Here both angle and axis can dynamically change.

 *

 * @param angleaxis Combined 4-tuple representing the (angle,axisX,axisY,axisZ).

 * @param center    Coordinates of the Point we are rotating around.

 * @return          ID of the effect added, or -1 if we failed to add one.

 */

  public long rotate(Data4D angleaxis, Data3D center)

    {

    return mM.add(EffectNames.ROTATE, angleaxis, center);

    }

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

/**

 * Rotates the Object by quaternion.

 *

 * @param quaternion The quaternion describing the rotation.

 * @param center     Coordinates of the Point we are rotating around.

 * @return           ID of the effect added, or -1 if we failed to add one.

 */

  public long quaternion(Data4D quaternion, Data3D center )

    {

    return mM.add(EffectNames.QUATERNION,quaternion,center);

    }

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

/**

 * Shears the Object.

 *

 * @param shear   The 3-tuple of shear factors. The first controls level

 *                of shearing in the X-axis, second - Y-axis and the third -

 *                Z-axis. Each is the tangens of the shear angle, i.e 0 -

 *                no shear, 1 - shear by 45 degrees (tan(45deg)=1) etc.

 * @param center  Center of shearing, i.e. the point which stays unmoved.

 * @return        ID of the effect added, or -1 if we failed to add one.

 */

  public long shear(Data3D shear, Data3D center)

    {

    return mM.add(EffectNames.SHEAR, shear, center);

    }

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

// Fragment-based effects  

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

/**

 * Makes a certain sub-region of the Object smoothly change all three of its RGB components.

 *        

 * @param blend  1-dimensional Data that returns the level of blend a given pixel will be

 *               mixed with the next parameter 'color': pixel = (1-level)*pixel + level*color.

 *               Valid range: <0,1>

 * @param color  Color to mix. (1,0,0) is RED.

 * @param region Region this Effect is limited to.

 * @param smooth If true, the level of 'blend' will smoothly fade out towards the edges of the region.

 * @return       ID of the effect added, or -1 if we failed to add one.

 */

  public long chroma(Data1D blend, Data3D color, Data4D region, boolean smooth)

    {

    return mF.add( smooth? EffectNames.SMOOTH_CHROMA:EffectNames.CHROMA, blend, color, region);

    }

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

/**

 * Makes the whole Object smoothly change all three of its RGB components.

 *

 * @param blend  1-dimensional Data that returns the level of blend a given pixel will be

 *               mixed with the next parameter 'color': pixel = (1-level)*pixel + level*color.

 *               Valid range: <0,1>

 * @param color  Color to mix. (1,0,0) is RED.

 * @return       ID of the effect added, or -1 if we failed to add one.

 */

  public long chroma(Data1D blend, Data3D color)

    {

    return mF.add(EffectNames.CHROMA, blend, color);

    }

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

/**

 * Makes a certain sub-region of the Object smoothly change its transparency level.

 *        

 * @param alpha  1-dimensional Data that returns the level of transparency we want to have at any given

 *               moment: pixel.a *= alpha.

 *               Valid range: <0,1>

 * @param region Region this Effect is limited to. 

 * @param smooth If true, the level of 'alpha' will smoothly fade out towards the edges of the region.

 * @return       ID of the effect added, or -1 if we failed to add one. 

 */

  public long alpha(Data1D alpha, Data4D region, boolean smooth)

    {

    return mF.add( smooth? EffectNames.SMOOTH_ALPHA:EffectNames.ALPHA, alpha, region);

    }

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

/**

 * Makes the whole Object smoothly change its transparency level.

 *

 * @param alpha  1-dimensional Data that returns the level of transparency we want to have at any

 *               given moment: pixel.a *= alpha.

 *               Valid range: <0,1>

 * @return       ID of the effect added, or -1 if we failed to add one.

 */

  public long alpha(Data1D alpha)

    {

    return mF.add(EffectNames.ALPHA, alpha);

    }

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

/**

 * Makes a certain sub-region of the Object smoothly change its brightness level.

 *        

 * @param brightness 1-dimensional Data that returns the level of brightness we want to have

 *                   at any given moment. Valid range: <0,infinity)

 * @param region     Region this Effect is limited to.

 * @param smooth     If true, the level of 'brightness' will smoothly fade out towards the edges of the region.

 * @return           ID of the effect added, or -1 if we failed to add one.

 */

  public long brightness(Data1D brightness, Data4D region, boolean smooth)

    {

    return mF.add( smooth ? EffectNames.SMOOTH_BRIGHTNESS: EffectNames.BRIGHTNESS, brightness, region);

    }

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

/**

 * Makes the whole Object smoothly change its brightness level.

 *

 * @param brightness 1-dimensional Data that returns the level of brightness we want to have

 *                   at any given moment. Valid range: <0,infinity)

 * @return           ID of the effect added, or -1 if we failed to add one.

 */

  public long brightness(Data1D brightness)

    {

    return mF.add(EffectNames.BRIGHTNESS, brightness);

    }

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

/**

 * Makes a certain sub-region of the Object smoothly change its contrast level.

 *        

 * @param contrast 1-dimensional Data that returns the level of contrast we want to have

 *                 at any given moment. Valid range: <0,infinity)

 * @param region   Region this Effect is limited to.

 * @param smooth   If true, the level of 'contrast' will smoothly fade out towards the edges of the region.

 * @return         ID of the effect added, or -1 if we failed to add one.

 */

  public long contrast(Data1D contrast, Data4D region, boolean smooth)

    {

    return mF.add( smooth ? EffectNames.SMOOTH_CONTRAST:EffectNames.CONTRAST, contrast, region);

    }

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

/**

 * Makes the whole Object smoothly change its contrast level.

 *

 * @param contrast 1-dimensional Data that returns the level of contrast we want to have

 *                 at any given moment. Valid range: <0,infinity)

 * @return         ID of the effect added, or -1 if we failed to add one.

 */

  public long contrast(Data1D contrast)

    {

    return mF.add(EffectNames.CONTRAST, contrast);

    }

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

/**

 * Makes a certain sub-region of the Object smoothly change its saturation level.