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.effectqueue;

import android.opengl.GLES31;

import android.opengl.Matrix;

import org.distorted.library.effect.EffectType;

import org.distorted.library.effect.MatrixEffect;

import org.distorted.library.message.EffectMessageSender;

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

class EffectQueueMatrix extends EffectQueue

  {   

  private static final int NUM_UNIFORMS = MatrixEffect.NUM_UNIFORMS;

  private static final int INDEX = EffectType.MATRIX.ordinal();

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

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

  private static int[] mObjDH      = new int[MAIN_VARIANTS];

  private static int[] mMVPMatrixH = new int[MAIN_VARIANTS];

  private static int[] mMVMatrixH  = new int[MAIN_VARIANTS];

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

  private static float[] mTmpResult = new float[4];

  private static float[] mTmpPoint  = new float[4];

  private static float mMinX,mMaxX,mMinY,mMaxY;

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

  EffectQueueMatrix()

    { 

    super(NUM_UNIFORMS,INDEX );

    }

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

  static void uniforms(int mProgramH, int variant)

    {

    mObjDH[variant]     = GLES31.glGetUniformLocation(mProgramH, "u_objD");

    mMVPMatrixH[variant]= GLES31.glGetUniformLocation(mProgramH, "u_MVPMatrix");

    mMVMatrixH[variant] = GLES31.glGetUniformLocation(mProgramH, "u_MVMatrix");

    }

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

  private void magnifyDir()

    {

    Matrix.multiplyMV(mTmpResult,0,mTmpMatrix,0,mTmpPoint,0);

    float nx = mTmpResult[0]/mTmpResult[3];

    float ny = mTmpResult[1]/mTmpResult[3];

    if( nx<mMinX ) mMinX = nx;

    if( nx>mMaxX ) mMaxX = nx;

    if( ny<mMinY ) mMinY = ny;

    if( ny>mMaxY ) mMaxY = ny;

    }

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

// return a float which describes how much larger an object must be so that it appears to be (about)

// 'marginInPixels' pixels larger in each direction. Used in Postprocessing.

  float magnify(float[] projection, int width, int height, float mipmap, float halfX, float halfY, float halfZ, float marginInPixels)

    {

    mMinX = Integer.MAX_VALUE;

    mMaxX = Integer.MIN_VALUE;

    mMinY = Integer.MAX_VALUE;

    mMaxY = Integer.MIN_VALUE;

    mTmpPoint[3] = 1.0f;

    Matrix.multiplyMM(mTmpMatrix, 0, projection, 0, mViewMatrix, 0);

    mTmpPoint[0] = +halfX; mTmpPoint[1] = +halfY; mTmpPoint[2] = +halfZ; magnifyDir();

    mTmpPoint[0] = +halfX; mTmpPoint[1] = +halfY; mTmpPoint[2] = -halfZ; magnifyDir();

    mTmpPoint[0] = +halfX; mTmpPoint[1] = -halfY; mTmpPoint[2] = +halfZ; magnifyDir();

    mTmpPoint[0] = +halfX; mTmpPoint[1] = -halfY; mTmpPoint[2] = -halfZ; magnifyDir();

    mTmpPoint[0] = -halfX; mTmpPoint[1] = +halfY; mTmpPoint[2] = +halfZ; magnifyDir();

    mTmpPoint[0] = -halfX; mTmpPoint[1] = +halfY; mTmpPoint[2] = -halfZ; magnifyDir();

    mTmpPoint[0] = -halfX; mTmpPoint[1] = -halfY; mTmpPoint[2] = +halfZ; magnifyDir();

    mTmpPoint[0] = -halfX; mTmpPoint[1] = -halfY; mTmpPoint[2] = -halfZ; magnifyDir();

    float xLenInPixels = width *(mMaxX-mMinX)/2;

    float yLenInPixels = height*(mMaxY-mMinY)/2;

    // already margin / avg(xLen,yLen) is the size of the halo.

    // Here we need a bit more because we are marking not only the halo, but a little bit around

    // it as well so that the (blur for example) will be smooth on the edges. Thus the 2.0f.

    // ( 4.0 because there is an extra 2.0 from the avg(xLen,yLen) )

    //

    // mMipmap ( 1.0, 0.5, 0.25, 0.125 ) - we need to make the size of the halo independent

    // of postprocessing effect quality.

    return mipmap*4.0f*marginInPixels/( xLenInPixels+yLenInPixels );

    }

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

  void compute(long currTime)

    {

    if( currTime==mTime ) return;

    if( mTime==0 ) mTime = currTime;

    long step = (currTime-mTime);

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

      {

      mCurrentDuration[i] += step;

      if( mEffects[i].compute(mUniforms, NUM_UNIFORMS*i, mCurrentDuration[i], step) )

        {

        EffectMessageSender.newMessage(mEffects[i]);

        }

      }

    mTime = currTime;  

    }  

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

  float[] getMVP()

    {

    return mMVPMatrix;

    }

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

  void send(int width, int height, float distance, float mipmap, float[] projection, float halfX, float halfY, float halfZ, int variant)

    {

    Matrix.setIdentityM(mViewMatrix, 0);

    Matrix.translateM(mViewMatrix, 0, -width*0.5f, -height*0.5f, -distance);

    if( mipmap!=1 ) Matrix.scaleM(mViewMatrix, 0, mipmap, mipmap, mipmap);

    for(int i=mNumEffects-1; i>=0; i--) ((MatrixEffect)mEffects[i]).apply(mViewMatrix,mUniforms,i);

    Matrix.translateM(mViewMatrix, 0, halfX,halfY,halfZ);

    Matrix.multiplyMM(mMVPMatrix, 0, projection, 0, mViewMatrix, 0);

    GLES31.glUniform3f( mObjDH[variant] , halfX, halfY, halfZ);

    GLES31.glUniformMatrix4fv(mMVMatrixH[variant] , 1, false, mViewMatrix, 0);

    GLES31.glUniformMatrix4fv(mMVPMatrixH[variant], 1, false, mMVPMatrix , 0);

    }

  }