mirror of https://github.com/axmolengine/axmol.git
86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
/****************************************************************************
|
|
Copyright (c) 2016 Google Inc.
|
|
Copyright (c) 2016 Chukong Technologies Inc.
|
|
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
|
|
|
|
http://www.cocos2d-x.org
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to 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, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
****************************************************************************/
|
|
|
|
#include "vr/CCVRDistortion.h"
|
|
#include <math.h>
|
|
|
|
NS_CC_BEGIN
|
|
|
|
Distortion::Distortion()
|
|
{
|
|
_coefficients[0] = 0.441f;
|
|
_coefficients[1] = 0.156f;
|
|
}
|
|
|
|
void Distortion::setCoefficients(float *coefficients)
|
|
{
|
|
for (int i = 0; i < s_numberOfCoefficients; i++)
|
|
{
|
|
_coefficients[i] = coefficients[i];
|
|
}
|
|
}
|
|
|
|
float *Distortion::coefficients()
|
|
{
|
|
return _coefficients;
|
|
}
|
|
|
|
float Distortion::distortionFactor(float radius)
|
|
{
|
|
float result = 1.0f;
|
|
float rFactor = 1.0f;
|
|
float squaredRadius = radius * radius;
|
|
for (int i = 0; i < s_numberOfCoefficients; i++)
|
|
{
|
|
rFactor *= squaredRadius;
|
|
result += _coefficients[i] * rFactor;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
float Distortion::distort(float radius)
|
|
{
|
|
return radius * distortionFactor(radius);
|
|
}
|
|
|
|
float Distortion::distortInverse(float radius)
|
|
{
|
|
float r0 = radius / 0.9f;
|
|
float r = radius * 0.9f;
|
|
float dr0 = radius - distort(r0);
|
|
while (fabsf(r - r0) > 0.0001f)
|
|
{
|
|
float dr = radius - distort(r);
|
|
float r2 = r - dr * ((r - r0) / (dr - dr0));
|
|
r0 = r;
|
|
r = r2;
|
|
dr0 = dr;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
NS_CC_END
|