You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
/* Quicktex Texture Compression Library
|
|
Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
|
|
Partially derived from rgbcx.h written by Richard Geldreich <richgel99@gmail.com>
|
|
and licenced under the public domain
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <array>
|
|
#include <cstdint>
|
|
#include <cstdlib>
|
|
#include <utility>
|
|
|
|
#include "../../Color.h"
|
|
|
|
namespace quicktex::s3tc {
|
|
|
|
class alignas(8) BC1Block {
|
|
public:
|
|
static constexpr size_t Width = 4;
|
|
static constexpr size_t Height = 4;
|
|
|
|
static constexpr size_t EndpointSize = 2; // size of a 5:6:5 endpoint in bytes
|
|
static constexpr size_t SelectorSize = 4; // size of selector array in bytes
|
|
static constexpr size_t SelectorBits = 2; // size of a selector in bits
|
|
static constexpr uint8_t SelectorMax = (1 << SelectorBits) - 1; // maximum value of a selector
|
|
|
|
using SelectorArray = std::array<std::array<uint8_t, Width>, Height>;
|
|
using ColorPair = std::pair<Color, Color>;
|
|
|
|
private:
|
|
std::array<uint8_t, EndpointSize> _color0;
|
|
std::array<uint8_t, EndpointSize> _color1;
|
|
std::array<uint8_t, SelectorSize> _selectors;
|
|
|
|
public:
|
|
/// Create a new BC1Blok
|
|
constexpr BC1Block() : _color0(), _color1(), _selectors() {
|
|
static_assert(sizeof(BC1Block) == 8);
|
|
static_assert(sizeof(std::array<BC1Block, 10>) == 8 * 10);
|
|
static_assert(alignof(BC1Block) >= 8);
|
|
}
|
|
|
|
/**
|
|
* Create a new BC1Block
|
|
* @param color0 first endpoint color
|
|
* @param color1 second endpoint color
|
|
* @param selectors the selectors as a 4x4 list of integers, between 0 and 3 inclusive.
|
|
*/
|
|
BC1Block(Color color0, Color color1, const SelectorArray& selectors) {
|
|
SetColor0(color0);
|
|
SetColor1(color1);
|
|
SetSelectors(selectors);
|
|
}
|
|
|
|
/**
|
|
* Create a new BC1Block
|
|
* @param ep0 first endpoint
|
|
* @param ep1 second endpoint
|
|
* @param selectors the selectors as a 4x4 list of integers, between 0 and 3 inclusive.
|
|
*/
|
|
BC1Block(uint16_t ep0, uint16_t ep1, const SelectorArray& selectors) {
|
|
SetColor0Raw(ep0);
|
|
SetColor1Raw(ep1);
|
|
SetSelectors(selectors);
|
|
}
|
|
|
|
/**
|
|
* Create a new BC1Block
|
|
* @param ep0 first endpoint
|
|
* @param ep1 second endpoint
|
|
* @param solid_mask single byte mask to use for each row
|
|
*/
|
|
BC1Block(uint16_t ep0, uint16_t ep1, uint8_t solid_mask) {
|
|
SetColor0Raw(ep0);
|
|
SetColor1Raw(ep1);
|
|
_selectors.fill(solid_mask);
|
|
}
|
|
|
|
uint16_t GetColor0Raw() const;
|
|
uint16_t GetColor1Raw() const;
|
|
|
|
void SetColor0Raw(uint16_t c);
|
|
void SetColor1Raw(uint16_t c);
|
|
|
|
Color GetColor0() const { return Color::Unpack565(GetColor0Raw()); }
|
|
Color GetColor1() const { return Color::Unpack565(GetColor1Raw()); }
|
|
ColorPair GetColors() const { return {GetColor0(), GetColor1()}; }
|
|
|
|
void SetColor0(Color c) { SetColor0Raw(c.Pack565()); }
|
|
void SetColor1(Color c) { SetColor1Raw(c.Pack565()); }
|
|
void SetColors(ColorPair cs) {
|
|
SetColor0(cs.first);
|
|
SetColor1(cs.second);
|
|
}
|
|
|
|
/**
|
|
* Get this block's selectors
|
|
* @return a 4x4 array of integers between 0 and 3 inclusive
|
|
*/
|
|
SelectorArray GetSelectors() const;
|
|
|
|
/**
|
|
* Set this block's selectors
|
|
* @param unpacked a 4x4 array of integers between 0 and 3 inclusive
|
|
*/
|
|
void SetSelectors(const SelectorArray& unpacked);
|
|
|
|
bool Is3Color() const { return GetColor0Raw() <= GetColor1Raw(); }
|
|
|
|
bool operator==(const BC1Block& Rhs) const;
|
|
bool operator!=(const BC1Block& Rhs) const;
|
|
};
|
|
} // namespace quicktex::s3tc
|