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Diffstat (limited to 'include/gal/opengl/glm/gtx/gradient_paint.inl')
| -rw-r--r-- | include/gal/opengl/glm/gtx/gradient_paint.inl | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/gal/opengl/glm/gtx/gradient_paint.inl b/include/gal/opengl/glm/gtx/gradient_paint.inl new file mode 100644 index 0000000..bdf5a65 --- /dev/null +++ b/include/gal/opengl/glm/gtx/gradient_paint.inl @@ -0,0 +1,43 @@ +/////////////////////////////////////////////////////////////////////////////////////////////////// +// OpenGL Mathematics Copyright (c) 2005 - 2013 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 +{ + template <typename valType> + valType radialGradient + ( + detail::tvec2<valType> const & Center, + valType const & Radius, + detail::tvec2<valType> const & Focal, + detail::tvec2<valType> const & Position + ) + { + detail::tvec2<valType> F = Focal - Center; + detail::tvec2<valType> D = Position - Focal; + valType Radius2 = pow2(Radius); + valType Fx2 = pow2(F.x); + valType Fy2 = pow2(F.y); + + valType Numerator = (D.x * F.x + D.y * F.y) + sqrt(Radius2 * (pow2(D.x) + pow2(D.y)) - pow2(D.x * F.y - D.y * F.x)); + valType Denominator = Radius2 - (Fx2 + Fy2); + return Numerator / Denominator; + } + + template <typename valType> + valType linearGradient + ( + detail::tvec2<valType> const & Point0, + detail::tvec2<valType> const & Point1, + detail::tvec2<valType> const & Position + ) + { + detail::tvec2<valType> Dist = Point1 - Point0; + return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist); + } +}//namespace glm |