blob: 6967ff4e8b412613e5ee287fc1c26f6c5fb3d42e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
///////////////////////////////////////////////////////////////////////////////////////////////////
// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
///////////////////////////////////////////////////////////////////////////////////////////////////
// Created : 2009-03-06
// Updated : 2009-03-09
// Licence : This source is under MIT License
// File : glm/gtx/gradient_paint.inl
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace glm{
namespace gtx{
namespace gradient_paint{
template <typename valType>
valType radialGradient(
glm::detail::tvec2<valType> const & Center,
valType const & Radius,
glm::detail::tvec2<valType> const & Focal,
glm::detail::tvec2<valType> const & Position)
{
glm::detail::tvec2<valType> F = Focal - Center;
glm::detail::tvec2<valType> D = Position - Focal;
valType Radius2 = gtx::optimum_pow::pow2(Radius);
valType Fx2 = gtx::optimum_pow::pow2(F.x);
valType Fy2 = gtx::optimum_pow::pow2(F.y);
valType Numerator = (D.x * F.x + D.y * F.y) + glm::sqrt(Radius2 * (gtx::optimum_pow::pow2(D.x) + gtx::optimum_pow::pow2(D.y)) - gtx::optimum_pow::pow2(D.x * F.y - D.y * F.x));
valType Denominator = Radius2 - (Fx2 + Fy2);
return Numerator / Denominator;
}
template <typename valType>
valType linearGradient(
glm::detail::tvec2<valType> const & Point0,
glm::detail::tvec2<valType> const & Point1,
glm::detail::tvec2<valType> const & Position)
{
glm::detail::tvec2<valType> Dist = Point1 - Point0;
return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist);
}
}//namespace gradient_paint
}//namespace gtx
}//namespace glm
|
