💿🐜 Antkeeper source code
https://antkeeper.com
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110 lines
3.0 KiB
110 lines
3.0 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/texture-cube.hpp>
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#include <cmath>
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namespace gl {
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cube_map_layout texture_cube::infer_cube_map_layout(std::uint16_t w, std::uint16_t h) noexcept
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{
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if (h == w * 6)
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{
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return cube_map_layout::column;
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}
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else if (w == h * 6)
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{
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return cube_map_layout::row;
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}
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else if (w == (h / 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 (h == (w / 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 (w == h * 2)
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{
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return cube_map_layout::equirectangular;
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}
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else if (w == h)
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{
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return cube_map_layout::spherical;
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}
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return {};
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}
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std::uint16_t texture_cube::infer_cube_map_face_size(cube_map_layout layout, std::uint16_t w, std::uint16_t h) 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 w;
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case cube_map_layout::row:
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return h;
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case cube_map_layout::vertical_cross:
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return h / 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 w / 4;
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default:
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return 0;
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}
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}
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texture_cube::texture_cube(std::uint16_t width, std::uint16_t height, gl::pixel_type type, gl::pixel_format format, gl::transfer_function transfer_function, const std::byte* data):
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texture(width, height, true, type, format, transfer_function, data)
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{
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resized();
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}
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void texture_cube::resize(std::uint16_t width, std::uint16_t height, gl::pixel_type type, gl::pixel_format format, gl::transfer_function transfer_function, const std::byte* data)
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{
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texture::resize(width, height, type, format, transfer_function, data);
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resized();
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}
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void texture_cube::resize(std::uint16_t width, std::uint16_t height, const std::byte* data)
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{
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texture::resize(width, height, get_pixel_type(), get_pixel_format(), get_transfer_function(), data);
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resized();
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}
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void texture_cube::set_wrapping(gl::texture_wrapping wrap_s, texture_wrapping wrap_t, texture_wrapping wrap_r)
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{
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texture::set_wrapping(wrap_s, wrap_t, wrap_r);
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}
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void texture_cube::resized()
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{
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const auto w = get_width();
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const auto h = get_height();
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const auto layout = infer_cube_map_layout(w, h);
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m_face_size = infer_cube_map_face_size(layout, w, h);
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m_mip_count = 1 + static_cast<std::uint16_t>(std::log2(m_face_size));
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}
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} // namespace gl
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