mirror of
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138 lines
5.0 KiB
C++
138 lines
5.0 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 2020 <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 Affero 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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero 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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#pragma pack(push, 1)
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class BC1Block {
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public:
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uint16_t GetLowColor() const { return _low_color[0] | _low_color[1] << 8U; }
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uint16_t GetHighColor() const { return _high_color[0] | _high_color[1] << 8U; }
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Color32 GetLowColor32() const { return Color32::unpack565(GetLowColor()); }
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Color32 GetHighColor32() const { return Color32::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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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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class BC4Block {
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public:
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inline uint32_t GetLowAlpha() const { return low_alpha; }
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inline uint32_t GetHighAlpha() const { return high_alpha; }
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inline bool Is6Alpha() const { return GetLowAlpha() <= GetHighAlpha(); }
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inline uint64_t GetSelectorBits() const {
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return ((uint64_t)((uint32_t)selectors[0] | ((uint32_t)selectors[1] << 8U) | ((uint32_t)selectors[2] << 16U) | ((uint32_t)selectors[3] << 24U))) |
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(((uint64_t)selectors[4]) << 32U) | (((uint64_t)selectors[5]) << 40U);
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}
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inline uint32_t GetSelector(uint32_t x, uint32_t y, uint64_t selector_bits) const {
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assert((x < 4U) && (y < 4U));
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return (selector_bits >> (((y * 4) + x) * SelectorBits)) & (SelectorMask);
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}
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static inline std::array<uint8_t, 8> GetBlockValues6(uint32_t l, uint32_t h) {
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return {static_cast<uint8_t>(l),
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static_cast<uint8_t>(h),
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static_cast<uint8_t>((l * 4 + h) / 5),
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static_cast<uint8_t>((l * 3 + h * 2) / 5),
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static_cast<uint8_t>((l * 2 + h * 3) / 5),
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static_cast<uint8_t>((l + h * 4) / 5),
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0,
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255};
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}
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static inline std::array<uint8_t, 8> GetBlockValues8(uint32_t l, uint32_t h) {
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return {static_cast<uint8_t>(l),
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static_cast<uint8_t>(h),
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static_cast<uint8_t>((l * 6 + h) / 7),
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static_cast<uint8_t>((l * 5 + h * 2) / 7),
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static_cast<uint8_t>((l * 4 + h * 3) / 7),
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static_cast<uint8_t>((l * 3 + h * 4) / 7),
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static_cast<uint8_t>((l * 2 + h * 5) / 7),
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static_cast<uint8_t>((l + h * 6) / 7)};
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}
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static inline std::array<uint8_t, 8> GetBlockValues(uint32_t l, uint32_t h) {
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if (l > h)
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return GetBlockValues8(l, h);
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else
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return GetBlockValues6(l, h);
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}
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constexpr static inline size_t EndpointSize = 1;
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constexpr static inline size_t SelectorSize = 6;
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constexpr static inline uint8_t SelectorBits = 3;
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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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uint8_t low_alpha;
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uint8_t high_alpha;
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uint8_t selectors[SelectorSize];
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};
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class BC3Block {
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public:
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BC4Block alpha_block;
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BC1Block color_block;
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};
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class BC5Block {
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public:
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BC4Block r_block;
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BC4Block g_block;
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};
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#pragma pack(pop) |