💿🐜 Antkeeper source code
https://antkeeper.com
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77 lines
1.9 KiB
77 lines
1.9 KiB
/*
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* Copyright (C) 2023 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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#include <engine/gl/cube-map.hpp>
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namespace gl {
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cube_map_layout infer_cube_map_layout(std::uint32_t width, std::uint32_t height) noexcept
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{
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if (width == height / 6)
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{
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return cube_map_layout::column;
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}
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else if (width == height * 6)
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{
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return cube_map_layout::row;
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}
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else if (width == (height / 4) * 3)
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{
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return cube_map_layout::vertical_cross;
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}
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else if (width == (height * 4) / 3)
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{
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return cube_map_layout::horizontal_cross;
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}
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else if (width == height * 2)
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{
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return cube_map_layout::equirectangular;
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}
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else if (width == height)
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{
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return cube_map_layout::spherical;
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}
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return cube_map_layout::unknown;
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}
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std::uint32_t infer_cube_map_face_width(std::uint32_t width, std::uint32_t height, cube_map_layout layout) noexcept
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{
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switch (layout)
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{
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case cube_map_layout::column:
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case cube_map_layout::spherical:
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return width;
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case cube_map_layout::row:
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return height;
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case cube_map_layout::vertical_cross:
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return height / 4;
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case cube_map_layout::horizontal_cross:
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case cube_map_layout::equirectangular:
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return width / 4;
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default:
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return 0;
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}
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}
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} // namespace gl
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