Distorted Android

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// Copyright 2017 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/>.                            //

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package org.distorted.library.effect;

public class MatrixEffectShear extends MatrixEffect

  {

 * 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.

 */

    mCenter = center;

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  public boolean compute(float[] uniforms, int index, long currentDuration, long step )

    {

    return mShear.get(uniforms,index,currentDuration,step);

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  public void apply(float[] matrix, float[] uniforms, int index)

    {

    float sx = uniforms[NUM_UNIFORMS*index  ];

    float sy = uniforms[NUM_UNIFORMS*index+1];

    float sz = uniforms[NUM_UNIFORMS*index+2];

    float x  = uniforms[NUM_UNIFORMS*index+4];

    float y  = uniforms[NUM_UNIFORMS*index+5];

    float z  = uniforms[NUM_UNIFORMS*index+6];

    Matrix.translateM(matrix, 0, x,-y, z);

    matrix[4] += sx*matrix[0]; // Multiply viewMatrix by 1 x 0 0 , i.e. X-shear.

    matrix[5] += sx*matrix[1]; //                        0 1 0 0

    matrix[6] += sx*matrix[2]; //                        0 0 1 0

    matrix[7] += sx*matrix[3]; //                        0 0 0 1

    matrix[0] += sy*matrix[4]; // Multiply viewMatrix by 1 0 0 0 , i.e. Y-shear.

    matrix[1] += sy*matrix[5]; //                        y 1 0 0

    matrix[2] += sy*matrix[6]; //                        0 0 1 0

    matrix[3] += sy*matrix[7]; //                        0 0 0 1

    matrix[4] += sz*matrix[8]; // Multiply viewMatrix by 1 0 0 0 , i.e. Z-shear.

    matrix[5] += sz*matrix[9]; //                        0 1 0 0

    matrix[6] += sz*matrix[10];//                        0 z 1 0

    matrix[7] += sz*matrix[11];//                        0 0 0 1

    Matrix.translateM(matrix, 0,-x, y, -z);

    }