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127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
/* Quicktex Texture Compression Library
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Copyright (C) 2021-2022 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 <cstdint>
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#include <cstdlib>
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#include <utility>
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#include "../../Color.h"
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namespace quicktex::s3tc {
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class alignas(8) BC1Block {
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public:
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static constexpr size_t Width = 4;
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static constexpr size_t Height = 4;
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static constexpr size_t EndpointSize = 2; // size of a 5:6:5 endpoint in bytes
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static constexpr size_t SelectorSize = 4; // size of selector array in bytes
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static constexpr size_t SelectorBits = 2; // size of a selector in bits
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static constexpr uint8_t SelectorMax = (1 << SelectorBits) - 1; // maximum value of a selector
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using SelectorArray = std::array<std::array<uint8_t, Width>, Height>;
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using ColorPair = std::pair<Color, Color>;
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private:
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std::array<uint8_t, EndpointSize> _color0;
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std::array<uint8_t, EndpointSize> _color1;
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std::array<uint8_t, SelectorSize> _selectors;
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public:
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/// Create a new BC1Blok
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constexpr BC1Block() : _color0(), _color1(), _selectors() {
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static_assert(sizeof(BC1Block) == 8);
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static_assert(sizeof(std::array<BC1Block, 10>) == 8 * 10);
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static_assert(alignof(BC1Block) >= 8);
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}
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/**
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* Create a new BC1Block
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* @param color0 first endpoint color
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* @param color1 second endpoint color
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* @param selectors the selectors as a 4x4 list of integers, between 0 and 3 inclusive.
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*/
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BC1Block(Color color0, Color color1, const SelectorArray& selectors) {
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SetColor0(color0);
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SetColor1(color1);
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SetSelectors(selectors);
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}
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/**
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* Create a new BC1Block
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* @param ep0 first endpoint
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* @param ep1 second endpoint
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* @param selectors the selectors as a 4x4 list of integers, between 0 and 3 inclusive.
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*/
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BC1Block(uint16_t ep0, uint16_t ep1, const SelectorArray& selectors) {
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SetColor0Raw(ep0);
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SetColor1Raw(ep1);
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SetSelectors(selectors);
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}
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/**
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* Create a new BC1Block
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* @param ep0 first endpoint
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* @param ep1 second endpoint
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* @param solid_mask single byte mask to use for each row
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*/
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BC1Block(uint16_t ep0, uint16_t ep1, uint8_t solid_mask) {
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SetColor0Raw(ep0);
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SetColor1Raw(ep1);
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_selectors.fill(solid_mask);
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}
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uint16_t GetColor0Raw() const;
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uint16_t GetColor1Raw() const;
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void SetColor0Raw(uint16_t c);
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void SetColor1Raw(uint16_t c);
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Color GetColor0() const { return Color::Unpack565(GetColor0Raw()); }
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Color GetColor1() const { return Color::Unpack565(GetColor1Raw()); }
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ColorPair GetColors() const { return {GetColor0(), GetColor1()}; }
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void SetColor0(Color c) { SetColor0Raw(c.Pack565()); }
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void SetColor1(Color c) { SetColor1Raw(c.Pack565()); }
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void SetColors(ColorPair cs) {
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SetColor0(cs.first);
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SetColor1(cs.second);
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}
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/**
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* Get this block's selectors
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* @return a 4x4 array of integers between 0 and 3 inclusive
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*/
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SelectorArray GetSelectors() const;
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/**
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* Set this block's selectors
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* @param unpacked a 4x4 array of integers between 0 and 3 inclusive
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*/
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void SetSelectors(const SelectorArray& unpacked);
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bool Is3Color() const { return GetColor0Raw() <= GetColor1Raw(); }
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bool operator==(const BC1Block& Rhs) const;
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bool operator!=(const BC1Block& Rhs) const;
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};
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} // namespace quicktex::s3tc
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