mirror of
https://github.com/drewcassidy/quicktex.git
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67 lines
2.7 KiB
C++
67 lines
2.7 KiB
C++
/* Quicktex Texture Compression Library
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Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
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Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
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and licenced under the public domain
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser 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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This program 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "BC4Block.h"
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#include <stdexcept>
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#include <algorithm>
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#include "../../util.h"
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namespace quicktex::s3tc {
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BC4Block::SelectorArray BC4Block::GetSelectors() const {
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auto packed = Pack<uint8_t, uint64_t, 8, SelectorSize>(_selectors);
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auto rows = Unpack<uint64_t, uint16_t, SelectorBits * Width, Height>(packed);
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return MapArray(rows, Unpack<uint16_t, uint8_t, SelectorBits, Width>);
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}
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void BC4Block::SetSelectors(const BC4Block::SelectorArray& unpacked) {
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for (unsigned y = 0; y < (unsigned)Height; y++) {
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if (std::any_of(unpacked[y].begin(), unpacked[y].end(), [](uint8_t i) { return i > SelectorMax; }))
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throw std::invalid_argument("Selector value out of bounds.");
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}
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auto rows = MapArray(unpacked, Pack<uint8_t, uint16_t, SelectorBits, Width>);
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auto packed = Pack<uint16_t, uint64_t, SelectorBits * Width, Height>(rows);
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_selectors = Unpack<uint64_t, uint8_t, 8, SelectorSize>(packed);
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}
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std::array<uint8_t, 8> BC4Block::GetValues6() const {
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return {alpha0,
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alpha1,
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static_cast<uint8_t>((alpha0 * 4 + alpha1) / 5),
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static_cast<uint8_t>((alpha0 * 3 + alpha1 * 2) / 5),
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static_cast<uint8_t>((alpha0 * 2 + alpha1 * 3) / 5),
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static_cast<uint8_t>((alpha0 + alpha1 * 4) / 5),
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0,
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0xFF};
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}
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std::array<uint8_t, 8> BC4Block::GetValues8() const {
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return {alpha0,
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alpha1,
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static_cast<uint8_t>((alpha0 * 6 + alpha1) / 7),
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static_cast<uint8_t>((alpha0 * 5 + alpha1 * 2) / 7),
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static_cast<uint8_t>((alpha0 * 4 + alpha1 * 3) / 7),
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static_cast<uint8_t>((alpha0 * 3 + alpha1 * 4) / 7),
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static_cast<uint8_t>((alpha0 * 2 + alpha1 * 5) / 7),
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static_cast<uint8_t>((alpha0 + alpha1 * 6) / 7)};
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}
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} // namespace quicktex::s3tc
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