| Tony-LunarG | b0b195d | 2015-05-13 15:01:06 -0600 | [diff] [blame] | 1 | /////////////////////////////////////////////////////////////////////////////////////////////////// |
| 2 | // OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) |
| 3 | /////////////////////////////////////////////////////////////////////////////////////////////////// |
| 4 | // Created : 2009-03-06 |
| 5 | // Updated : 2013-04-09 |
| 6 | // Licence : This source is under MIT License |
| 7 | // File : glm/gtx/gradient_paint.inl |
| 8 | /////////////////////////////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | namespace glm |
| 11 | { |
| 12 | template <typename T, precision P> |
| 13 | GLM_FUNC_QUALIFIER T radialGradient |
| 14 | ( |
| 15 | detail::tvec2<T, P> const & Center, |
| 16 | T const & Radius, |
| 17 | detail::tvec2<T, P> const & Focal, |
| 18 | detail::tvec2<T, P> const & Position |
| 19 | ) |
| 20 | { |
| 21 | detail::tvec2<T, P> F = Focal - Center; |
| 22 | detail::tvec2<T, P> D = Position - Focal; |
| 23 | T Radius2 = pow2(Radius); |
| 24 | T Fx2 = pow2(F.x); |
| 25 | T Fy2 = pow2(F.y); |
| 26 | |
| 27 | T 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)); |
| 28 | T Denominator = Radius2 - (Fx2 + Fy2); |
| 29 | return Numerator / Denominator; |
| 30 | } |
| 31 | |
| 32 | template <typename T, precision P> |
| 33 | GLM_FUNC_QUALIFIER T linearGradient |
| 34 | ( |
| 35 | detail::tvec2<T, P> const & Point0, |
| 36 | detail::tvec2<T, P> const & Point1, |
| 37 | detail::tvec2<T, P> const & Position |
| 38 | ) |
| 39 | { |
| 40 | detail::tvec2<T, P> Dist = Point1 - Point0; |
| 41 | return (Dist.x * (Position.x - Point0.x) + Dist.y * (Position.y - Point0.y)) / glm::dot(Dist, Dist); |
| 42 | } |
| 43 | }//namespace glm |