axmol/cocos/math/TransformUtils.cpp

/****************************************************************************
Copyright (c) 2009      Valentin Milea
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#include "math/TransformUtils.h"
#include "math/CCAffineTransform.h"

namespace cocos2d
{

void CGAffineToGL(const AffineTransform& t, float* m)
{
    // | m[0] m[4] m[8]  m[12] |     | m11 m21 m31 m41 |     | a c 0 tx |
    // | m[1] m[5] m[9]  m[13] |     | m12 m22 m32 m42 |     | b d 0 ty |
    // | m[2] m[6] m[10] m[14] | <=> | m13 m23 m33 m43 | <=> | 0 0 1  0 |
    // | m[3] m[7] m[11] m[15] |     | m14 m24 m34 m44 |     | 0 0 0  1 |

    m[2] = m[3] = m[6] = m[7] = m[8] = m[9] = m[11] = m[14] = 0.0f;
    m[10] = m[15] = 1.0f;
    m[0]          = t.a;
    m[4]          = t.c;
    m[12]         = t.tx;
    m[1]          = t.b;
    m[5]          = t.d;
    m[13]         = t.ty;
}

void GLToCGAffine(const float* m, AffineTransform* t)
{
    t->a  = m[0];
    t->c  = m[4];
    t->tx = m[12];
    t->b  = m[1];
    t->d  = m[5];
    t->ty = m[13];
}

}  // namespace   cocos2d