CS计算机代考程序代写 /////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 – 2015 G-Truc Creation (www.g-truc.net)
/// 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.
///
/// Restrictions:
/// By making use of the Software for military purposes, you choose to make
/// a Bunny unhappy.
///
/// 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.
///
/// @ref gtx_color_space
/// @file glm/gtx/color_space.inl
/// @date 2005-12-21 / 2011-06-07
/// @author Christophe Riccio
///////////////////////////////////////////////////////////////////////////////////////////////////

namespace glm
{
template
GLM_FUNC_QUALIFIER tvec3 rgbColor(const tvec3& hsvColor)
{
tvec3 hsv = hsvColor;
tvec3 rgbColor;

if(hsv.y == static_cast(0))
// achromatic (grey)
rgbColor = tvec3(hsv.z);
else
{
T sector = floor(hsv.x / T(60));
T frac = (hsv.x / T(60)) – sector;
// factorial part of h
T o = hsv.z * (T(1) – hsv.y);
T p = hsv.z * (T(1) – hsv.y * frac);
T q = hsv.z * (T(1) – hsv.y * (T(1) – frac));

switch(int(sector))
{
default:
case 0:
rgbColor.r = hsv.z;
rgbColor.g = q;
rgbColor.b = o;
break;
case 1:
rgbColor.r = p;
rgbColor.g = hsv.z;
rgbColor.b = o;
break;
case 2:
rgbColor.r = o;
rgbColor.g = hsv.z;
rgbColor.b = q;
break;
case 3:
rgbColor.r = o;
rgbColor.g = p;
rgbColor.b = hsv.z;
break;
case 4:
rgbColor.r = q;
rgbColor.g = o;
rgbColor.b = hsv.z;
break;
case 5:
rgbColor.r = hsv.z;
rgbColor.g = o;
rgbColor.b = p;
break;
}
}

return rgbColor;
}

template
GLM_FUNC_QUALIFIER tvec3 hsvColor(const tvec3& rgbColor)
{
tvec3 hsv = rgbColor;
float Min = min(min(rgbColor.r, rgbColor.g), rgbColor.b);
float Max = max(max(rgbColor.r, rgbColor.g), rgbColor.b);
float Delta = Max – Min;

hsv.z = Max;

if(Max != static_cast(0))
{
hsv.y = Delta / hsv.z;
T h = static_cast(0);

if(rgbColor.r == Max)
// between yellow & magenta
h = static_cast(0) + T(60) * (rgbColor.g – rgbColor.b) / Delta;
else if(rgbColor.g == Max)
// between cyan & yellow
h = static_cast(120) + T(60) * (rgbColor.b – rgbColor.r) / Delta;
else
// between magenta & cyan
h = static_cast(240) + T(60) * (rgbColor.r – rgbColor.g) / Delta;

if(h < T(0)) hsv.x = h + T(360); else hsv.x = h; } else { // If r = g = b = 0 then s = 0, h is undefined hsv.y = static_cast(0);
hsv.x = static_cast(0);
}

return hsv;
}

template
GLM_FUNC_QUALIFIER tmat4x4 saturation(T const s)
{
tvec3 rgbw = tvec3(T(0.2126), T(0.7152), T(0.0722));

T col0 = (T(1) – s) * rgbw.r;
T col1 = (T(1) – s) * rgbw.g;
T col2 = (T(1) – s) * rgbw.b;

tmat4x4 result(T(1));
result[0][0] = col0 + s;
result[0][1] = col0;
result[0][2] = col0;
result[1][0] = col1;
result[1][1] = col1 + s;
result[1][2] = col1;
result[2][0] = col2;
result[2][1] = col2;
result[2][2] = col2 + s;
return result;
}

template
GLM_FUNC_QUALIFIER tvec3 saturation(const T s, const tvec3& color)
{
return tvec3(saturation(s) * tvec4(color, T(0)));
}

template
GLM_FUNC_QUALIFIER tvec4 saturation(const T s, const tvec4& color)
{
return saturation(s) * color;
}

template
GLM_FUNC_QUALIFIER T luminosity(const tvec3& color)
{
const tvec3 tmp = tvec3(0.33, 0.59, 0.11);
return dot(color, tmp);
}
}//namespace glm