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85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
/* Python-rgbcx 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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#pragma once
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#include <array>
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#include <cassert>
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#include <cstdint>
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#include <cstdlib>
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#include "../Color.h"
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#include "../util.h"
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namespace rgbcx {
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#pragma pack(push, 1)
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class BC1Block {
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public:
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using UnpackedSelectors = std::array<std::array<uint8_t, 4>, 4>;
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uint16_t GetLowColor() const { return static_cast<uint16_t>(_low_color[0] | (_low_color[1] << 8U)); }
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uint16_t GetHighColor() const { return static_cast<uint16_t>(_high_color[0] | (_high_color[1] << 8U)); }
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Color GetLowColor32() const { return Color::Unpack565(GetLowColor()); }
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Color GetHighColor32() const { return Color::Unpack565(GetHighColor()); }
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bool Is3Color() const { return GetLowColor() <= GetHighColor(); }
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void SetLowColor(uint16_t c) {
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_low_color[0] = c & 0xFF;
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_low_color[1] = (c >> 8) & 0xFF;
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}
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void SetHighColor(uint16_t c) {
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_high_color[0] = c & 0xFF;
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_high_color[1] = (c >> 8) & 0xFF;
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}
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uint32_t GetSelector(uint32_t x, uint32_t y) const {
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assert((x < 4U) && (y < 4U));
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return (selectors[y] >> (x * SelectorBits)) & SelectorMask;
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}
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void SetSelector(uint32_t x, uint32_t y, uint32_t val) {
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assert((x < 4U) && (y < 4U) && (val < 4U));
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selectors[y] &= (~(SelectorMask << (x * SelectorBits)));
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selectors[y] |= (val << (x * SelectorBits));
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}
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UnpackedSelectors UnpackSelectors() const {
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UnpackedSelectors unpacked;
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for (unsigned i = 0; i < 4; i++) { unpacked[i] = Unpack<uint8_t, uint8_t, 2, 4>(selectors[i]); }
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return unpacked;
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}
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void PackSelectors(const UnpackedSelectors& unpacked, uint8_t mask = 0) {
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for (unsigned i = 0; i < 4; i++) { selectors[i] = mask ^ Pack<uint8_t, uint8_t, 2, 4>(unpacked[i]); }
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}
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constexpr static inline size_t EndpointSize = 2;
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constexpr static inline size_t SelectorSize = 4;
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constexpr static inline uint8_t SelectorBits = 2;
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constexpr static inline uint8_t SelectorValues = 1 << SelectorBits;
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constexpr static inline uint8_t SelectorMask = SelectorValues - 1;
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private:
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std::array<uint8_t, EndpointSize> _low_color;
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std::array<uint8_t, EndpointSize> _high_color;
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public:
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std::array<uint8_t, 4> selectors;
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};
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#pragma pack(pop)
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} // namespace rgbcx
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