cocos-enhance-kit/cocos2d-x/cocos/math/MathUtil.h

/**
 Copyright 2013 BlackBerry Inc.
 Copyright (c) 2014-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.

 Original file from GamePlay3D: http://gameplay3d.org

 This file was modified to fit the cocos2d-x project
 */

#ifndef MATHUTIL_H_
#define MATHUTIL_H_

#ifdef __SSE__
#include <xmmintrin.h>
#endif

#include "math/CCMathBase.h"

/**
 * @addtogroup base
 * @{
 */

NS_CC_MATH_BEGIN

/**
 * Defines a math utility class.
 *
 * This is primarily used for optimized internal math operations.
 */
class CC_DLL MathUtil
{
    friend class Mat4;
    friend class Vec3;

public:

    /**
     * Updates the given scalar towards the given target using a smoothing function.
     * The given response time determines the amount of smoothing (lag). A longer
     * response time yields a smoother result and more lag. To force the scalar to
     * follow the target closely, provide a response time that is very small relative
     * to the given elapsed time.
     *
     * @param x the scalar to update.
     * @param target target value.
     * @param elapsedTime elapsed time between calls.
     * @param responseTime response time (in the same units as elapsedTime).
     */
    static void smooth(float* x, float target, float elapsedTime, float responseTime);

    /**
     * Updates the given scalar towards the given target using a smoothing function.
     * The given rise and fall times determine the amount of smoothing (lag). Longer
     * rise and fall times yield a smoother result and more lag. To force the scalar to
     * follow the target closely, provide rise and fall times that are very small relative
     * to the given elapsed time.
     *
     * @param x the scalar to update.
     * @param target target value.
     * @param elapsedTime elapsed time between calls.
     * @param riseTime response time for rising slope (in the same units as elapsedTime).
     * @param fallTime response time for falling slope (in the same units as elapsedTime).
     */
    static void smooth(float* x, float target, float elapsedTime, float riseTime, float fallTime);

    /**
     * Linearly interpolates between from value to to value by alpha which is in
     * the range [0,1]
     *
     * @param from the from value.
     * @param to the to value.
     * @param alpha the alpha value between [0,1]
     *
     * @return interpolated float value
     */
    static float lerp(float from, float to, float alpha);
    
    /**
     * Add hash_combine math according to:
     * https://www.boost.org/doc/libs/1_55_0/doc/html/hash/reference.html#boost.hash_combine
     * @param seed
     * @param v
     */
    static void combineHash(size_t& seed, const size_t& v);
private:
    //Indicates that if neon is enabled
    static bool isNeon32Enabled();
    static bool isNeon64Enabled();
private:
#ifdef __SSE__
    static void addMatrix(const __m128 m[4], float scalar, __m128 dst[4]);

    static void addMatrix(const __m128 m1[4], const __m128 m2[4], __m128 dst[4]);

    static void subtractMatrix(const __m128 m1[4], const __m128 m2[4], __m128 dst[4]);

    static void multiplyMatrix(const __m128 m[4], float scalar, __m128 dst[4]);

    static void multiplyMatrix(const __m128 m1[4], const __m128 m2[4], __m128 dst[4]);

    static void negateMatrix(const __m128 m[4], __m128 dst[4]);

    static void transposeMatrix(const __m128 m[4], __m128 dst[4]);

    static void transformVec4(const __m128 m[4], const __m128& v, __m128& dst);
#endif
    static void addMatrix(const float* m, float scalar, float* dst);

    static void addMatrix(const float* m1, const float* m2, float* dst);

    static void subtractMatrix(const float* m1, const float* m2, float* dst);

    static void multiplyMatrix(const float* m, float scalar, float* dst);

    static void multiplyMatrix(const float* m1, const float* m2, float* dst);

    static void negateMatrix(const float* m, float* dst);

    static void transposeMatrix(const float* m, float* dst);

    static void transformVec4(const float* m, float x, float y, float z, float w, float* dst);

    static void transformVec4(const float* m, const float* v, float* dst);

    static void crossVec3(const float* v1, const float* v2, float* dst);
};

NS_CC_MATH_END
/**
 end of base group
 @}
 */
#define MATRIX_SIZE ( sizeof(float) * 16)

#endif