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/>.                            //

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

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

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

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

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

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

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

  private static float mMinX,mMaxX,mMinY,mMaxY;

    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(DistortedOutputSurface projection, 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.mProjectionMatrix, 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 = projection.mWidth *(mMaxX-mMinX)/2;

    float yLenInPixels = projection.mHeight*(mMaxY-mMinY)/2;

    // already margin / min(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.

    //

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

    // of postprocessing effect quality.

    return projection.mMipmap*2.0f*marginInPixels/( xLenInPixels>yLenInPixels ? yLenInPixels:xLenInPixels );

    }

    if( currTime==mTime ) return;

    if( mTime==0 ) mTime = currTime;

    long step = (currTime-mTime);

      {

        for(int j=0; j<mNumListeners; j++)

          }

      }

    mTime = currTime;  

    }  

  float[] getMVP()

    {

    return mMVPMatrix;

    }

    Matrix.setIdentityM(mViewMatrix, 0);

    Matrix.translateM(mViewMatrix, 0, -projection.mWidth/2, projection.mHeight/2, -projection.mDistance);

    float mipmap = projection.mMipmap;

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

    for(int i=0; i<mNumEffects; i++) ((MatrixEffect)mEffects[i]).apply(mViewMatrix,mUniforms,i);

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

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

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

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