💿🐜 Antkeeper source code
https://antkeeper.com
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61 lines
1.7 KiB
61 lines
1.7 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_MATH_PROJECTION_HPP
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#define ANTKEEPER_MATH_PROJECTION_HPP
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#include <cmath>
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namespace math {
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/**
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* Calculates a horizontal FoV given a vertical FoV and aspect ratio.
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*
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* @param v Vertical FoV, in radians.
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* @param r Ratio of width to height.
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*
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* @return Horizontal FoV, in radians.
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*
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* @see https://en.wikipedia.org/wiki/Field_of_view_in_video_games
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*/
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template <class T>
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T horizontal_fov(T v, T r)
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{
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return T{2} * std::atan(std::tan(v * T{0.5}) * r);
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}
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/**
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* Calculates a vertical FoV given a horizontal FoV and aspect ratio.
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*
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* @param h Horizontal FoV, in radians.
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* @param r Ratio of width to height.
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*
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* @return Vertical FoV, in radians.
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*
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* @see https://en.wikipedia.org/wiki/Field_of_view_in_video_games
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*/
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template <class T>
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T vertical_fov(T h, T r)
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{
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return T{2} * std::atan(std::tan(h * T{0.5}) / r);
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}
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} // namespace math
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#endif // ANTKEEPER_MATH_PROJECTION_HPP
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