axmol/cocos2dx/support/TransformUtils.cpp

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Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2009      Valentin Milea

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

namespace cocos2d {

void CGAffineToGL(const CCAffineTransform *t, GLfloat *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 GLfloat *m, CCAffineTransform *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