Matrix.cpp

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/* Copyright (c) 2014-2017, ARM Limited and Contributors
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge,
 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
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 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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 */

#include "Skybox.h"
#include "Matrix.h"

#include <cmath>
#include <cstdlib>
#include <cstring>

namespace Skybox
{
    /* Identity matrix. */
    const float Matrix::identityArray[16] =
    {
        1.0f, 0.0f, 0.0f, 0.0f,
        0.0f, 1.0f, 0.0f, 0.0f,
        0.0f, 0.0f, 1.0f, 0.0f,
        0.0f, 0.0f, 0.0f, 1.0f
    };

    /* Please see header for specification. */
    Matrix::Matrix(const float* array)
    {
        memcpy(elements, array, 16 * sizeof(float));
    }

    /* Please see header for specification. */
    Matrix Matrix::identityMatrix = Matrix(identityArray);

    /* Please see header for specification. */
    Matrix::Matrix(void){}

    /* Please see header for specification. */
    float* Matrix::getAsArray(void)
    {
        return elements;
    }

    /* Please see header for specification. */
    Matrix& Matrix::operator=(const Matrix &another)
    {
        if(this != &another)
        {
            memcpy(this->elements, another.elements, 16 * sizeof(float));
        }

        return *this;
    }

    /* Please see header for specification. */
    Matrix Matrix::matrixOrthographic(float left, float right, float bottom, float top, float zNear, float zFar)
    {
        Matrix result = identityMatrix;

        result.elements[0]  = 2.0f / (right - left);
        result.elements[12] = -(right + left) / (right - left);

        result.elements[5]  = 2.0f / (top - bottom);
        result.elements[13] = -(top + bottom) / (top - bottom);

        result.elements[10] = -2.0f / (zFar - zNear);
        result.elements[14] = -(zFar + zNear) / (zFar - zNear);

        return result;
    }
}