1523 lines
63 KiB
C++
1523 lines
63 KiB
C++
// SPDX-License-Identifier: MPL-2.0
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// Copyright © 2022 Skyline Team and Contributors (https://github.com/skyline-emu/)
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// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
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// This BCn Decoder is directly derivative of Swiftshader's BCn Decoder found at: https://github.com/google/swiftshader/blob/d070309f7d154d6764cbd514b1a5c8bfcef61d06/src/Device/BC_Decoder.cpp
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// This file does not follow the Skyline code conventions but has certain Skyline specific code
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// There are a lot of implicit and narrowing conversions in this file due to this (Warnings are disabled as a result)
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#include <array>
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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namespace {
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constexpr int BlockWidth = 4;
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constexpr int BlockHeight = 4;
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struct BC_color {
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void decode(uint8_t *dst, size_t x, size_t y, size_t dstW, size_t dstH, size_t dstPitch, size_t dstBpp, bool hasAlphaChannel, bool hasSeparateAlpha) const {
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Color c[4];
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c[0].extract565(c0);
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c[1].extract565(c1);
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if (hasSeparateAlpha || (c0 > c1)) {
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c[2] = ((c[0] * 2) + c[1]) / 3;
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c[3] = ((c[1] * 2) + c[0]) / 3;
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} else {
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c[2] = (c[0] + c[1]) >> 1;
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if (hasAlphaChannel) {
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c[3].clearAlpha();
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}
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}
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for (int j = 0; j < BlockHeight && (y + j) < dstH; j++) {
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size_t dstOffset = j * dstPitch;
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size_t idxOffset = j * BlockHeight;
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for (size_t i = 0; i < BlockWidth && (x + i) < dstW; i++, idxOffset++, dstOffset += dstBpp) {
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*reinterpret_cast<unsigned int *>(dst + dstOffset) = c[getIdx(idxOffset)].pack8888();
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}
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}
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}
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private:
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struct Color {
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Color() {
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c[0] = c[1] = c[2] = 0;
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c[3] = 0xFF000000;
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}
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void extract565(const unsigned int c565) {
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c[0] = ((c565 & 0x0000001F) << 3) | ((c565 & 0x0000001C) >> 2);
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c[1] = ((c565 & 0x000007E0) >> 3) | ((c565 & 0x00000600) >> 9);
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c[2] = ((c565 & 0x0000F800) >> 8) | ((c565 & 0x0000E000) >> 13);
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}
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unsigned int pack8888() const {
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return ((c[0] & 0xFF) << 16) | ((c[1] & 0xFF) << 8) | (c[2] & 0xFF) | c[3];
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}
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void clearAlpha() {
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c[3] = 0;
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}
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Color operator*(int factor) const {
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Color res;
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for (int i = 0; i < 4; ++i) {
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res.c[i] = c[i] * factor;
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}
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return res;
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}
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Color operator/(int factor) const {
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Color res;
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for (int i = 0; i < 4; ++i) {
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res.c[i] = c[i] / factor;
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}
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return res;
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}
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Color operator>>(int shift) const {
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Color res;
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for (int i = 0; i < 4; ++i) {
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res.c[i] = c[i] >> shift;
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}
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return res;
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}
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Color operator+(Color const &obj) const {
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Color res;
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for (int i = 0; i < 4; ++i) {
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res.c[i] = c[i] + obj.c[i];
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}
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return res;
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}
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private:
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int c[4];
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};
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size_t getIdx(int i) const {
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size_t offset = i << 1; // 2 bytes per index
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return (idx & (0x3 << offset)) >> offset;
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}
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unsigned short c0;
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unsigned short c1;
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unsigned int idx;
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};
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static_assert(sizeof(BC_color) == 8, "BC_color must be 8 bytes");
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struct BC_channel {
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void decode(uint8_t *dst, size_t x, size_t y, size_t dstW, size_t dstH, size_t dstPitch, size_t dstBpp, size_t channel, bool isSigned) const {
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int c[8] = {0};
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if (isSigned) {
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c[0] = static_cast<signed char>(data & 0xFF);
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c[1] = static_cast<signed char>((data & 0xFF00) >> 8);
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} else {
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c[0] = static_cast<uint8_t>(data & 0xFF);
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c[1] = static_cast<uint8_t>((data & 0xFF00) >> 8);
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}
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if (c[0] > c[1]) {
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for (int i = 2; i < 8; ++i) {
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c[i] = ((8 - i) * c[0] + (i - 1) * c[1]) / 7;
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}
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} else {
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for (int i = 2; i < 6; ++i) {
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c[i] = ((6 - i) * c[0] + (i - 1) * c[1]) / 5;
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}
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c[6] = isSigned ? -128 : 0;
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c[7] = isSigned ? 127 : 255;
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}
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for (size_t j = 0; j < BlockHeight && (y + j) < dstH; j++) {
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for (size_t i = 0; i < BlockWidth && (x + i) < dstW; i++) {
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dst[channel + (i * dstBpp) + (j * dstPitch)] = static_cast<uint8_t>(c[getIdx((j * BlockHeight) + i)]);
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}
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}
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}
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private:
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uint8_t getIdx(int i) const {
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int offset = i * 3 + 16;
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return static_cast<uint8_t>((data & (0x7ull << offset)) >> offset);
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}
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uint64_t data;
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};
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static_assert(sizeof(BC_channel) == 8, "BC_channel must be 8 bytes");
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struct BC_alpha {
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void decode(uint8_t *dst, size_t x, size_t y, size_t dstW, size_t dstH, size_t dstPitch, size_t dstBpp) const {
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dst += 3; // Write only to alpha (channel 3)
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for (size_t j = 0; j < BlockHeight && (y + j) < dstH; j++, dst += dstPitch) {
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uint8_t *dstRow = dst;
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for (size_t i = 0; i < BlockWidth && (x + i) < dstW; i++, dstRow += dstBpp) {
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*dstRow = getAlpha(j * BlockHeight + i);
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}
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}
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}
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private:
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uint8_t getAlpha(int i) const {
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int offset = i << 2;
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int alpha = (data & (0xFull << offset)) >> offset;
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return static_cast<uint8_t>(alpha | (alpha << 4));
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}
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uint64_t data;
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};
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static_assert(sizeof(BC_alpha) == 8, "BC_alpha must be 8 bytes");
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namespace BC6H {
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static constexpr int MaxPartitions = 64;
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// @fmt:off
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static constexpr uint8_t PartitionTable2[MaxPartitions][16] = {
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{ 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 },
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{ 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1 },
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{ 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1 },
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{ 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1 },
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{ 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1 },
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{ 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1 },
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{ 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1 },
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{ 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1 },
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{ 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
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{ 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1 },
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{ 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 },
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{ 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1 },
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{ 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1 },
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{ 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0 },
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{ 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0 },
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{ 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 },
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{ 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0 },
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{ 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1 },
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{ 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0 },
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{ 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0 },
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{ 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0 },
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{ 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0 },
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{ 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0 },
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{ 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0 },
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{ 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0 },
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{ 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0 },
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{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 },
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{ 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1 },
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{ 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0 },
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{ 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0 },
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{ 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0 },
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{ 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0 },
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{ 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1 },
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{ 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1 },
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{ 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0 },
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{ 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0 },
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{ 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0 },
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{ 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0 },
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{ 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 },
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{ 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1 },
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{ 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1 },
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{ 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0 },
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{ 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
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{ 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0 },
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{ 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0 },
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{ 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0 },
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{ 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1 },
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{ 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1 },
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{ 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0 },
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{ 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0 },
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{ 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1 },
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{ 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1 },
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{ 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1 },
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{ 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1 },
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{ 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1 },
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{ 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0 },
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{ 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0 },
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{ 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1 },
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};
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static constexpr uint8_t AnchorTable2[MaxPartitions] = {
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0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf,
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0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf,
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0xf, 0x2, 0x8, 0x2, 0x2, 0x8, 0x8, 0xf,
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0x2, 0x8, 0x2, 0x2, 0x8, 0x8, 0x2, 0x2,
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0xf, 0xf, 0x6, 0x8, 0x2, 0x8, 0xf, 0xf,
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0x2, 0x8, 0x2, 0x2, 0x2, 0xf, 0xf, 0x6,
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0x6, 0x2, 0x6, 0x8, 0xf, 0xf, 0x2, 0x2,
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0xf, 0xf, 0xf, 0xf, 0xf, 0x2, 0x2, 0xf,
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};
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// @fmt:on
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// 1.0f in half-precision floating point format
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static constexpr uint16_t halfFloat1 = 0x3C00;
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union Color {
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struct RGBA {
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uint16_t r = 0;
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uint16_t g = 0;
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uint16_t b = 0;
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uint16_t a = halfFloat1;
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RGBA(uint16_t r, uint16_t g, uint16_t b)
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: r(r), g(g), b(b) {
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}
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RGBA &operator=(const RGBA &other) {
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this->r = other.r;
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this->g = other.g;
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this->b = other.b;
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this->a = halfFloat1;
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return *this;
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}
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};
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Color(uint16_t r, uint16_t g, uint16_t b)
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: rgba(r, g, b) {
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}
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Color(int r, int g, int b)
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: rgba((uint16_t) r, (uint16_t) g, (uint16_t) b) {
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}
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Color() {}
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Color(const Color &other) {
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this->rgba = other.rgba;
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}
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Color &operator=(const Color &other) {
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this->rgba = other.rgba;
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return *this;
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}
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RGBA rgba;
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uint16_t channel[4];
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};
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static_assert(sizeof(Color) == 8, "BC6h::Color must be 8 bytes long");
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inline int32_t extendSign(int32_t val, size_t size) {
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// Suppose we have a 2-bit integer being stored in 4 bit variable:
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// x = 0b00AB
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//
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// In order to sign extend x, we need to turn the 0s into A's:
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// x_extend = 0bAAAB
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//
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// We can do that by flipping A in x then subtracting 0b0010 from x.
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// Suppose A is 1:
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// x = 0b001B
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// x_flip = 0b000B
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// x_minus = 0b111B
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// Since A is flipped to 0, subtracting the mask sets it and all the bits above it to 1.
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// And if A is 0:
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// x = 0b000B
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// x_flip = 0b001B
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// x_minus = 0b000B
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// We unset the bit we flipped, and touch no other bit
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uint16_t mask = 1u << (size - 1);
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return (val ^ mask) - mask;
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}
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static int constexpr RGBfChannels = 3;
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struct RGBf {
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uint16_t channel[RGBfChannels];
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size_t size[RGBfChannels];
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bool isSigned;
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RGBf() {
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static_assert(RGBfChannels == 3, "RGBf must have exactly 3 channels");
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static_assert(sizeof(channel) / sizeof(channel[0]) == RGBfChannels, "RGBf must have exactly 3 channels");
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static_assert(sizeof(channel) / sizeof(channel[0]) == sizeof(size) / sizeof(size[0]), "RGBf requires equally sized arrays for channels and channel sizes");
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for (int i = 0; i < RGBfChannels; i++) {
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channel[i] = 0;
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size[i] = 0;
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}
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isSigned = false;
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}
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void extendSign() {
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for (int i = 0; i < RGBfChannels; i++) {
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channel[i] = BC6H::extendSign(channel[i], size[i]);
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}
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}
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// Assuming this is the delta, take the base-endpoint and transform this into
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// a proper endpoint.
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//
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// The final computed endpoint is truncated to the base-endpoint's size;
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void resolveDelta(RGBf base) {
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for (int i = 0; i < RGBfChannels; i++) {
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size[i] = base.size[i];
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channel[i] = (base.channel[i] + channel[i]) & ((1 << base.size[i]) - 1);
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}
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// Per the spec:
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// "For signed formats, the results of the delta calculation must be sign
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// extended as well."
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if (isSigned) {
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extendSign();
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}
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}
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void unquantize() {
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if (isSigned) {
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unquantizeSigned();
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} else {
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unquantizeUnsigned();
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}
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}
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void unquantizeUnsigned() {
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for (int i = 0; i < RGBfChannels; i++) {
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if (size[i] >= 15 || channel[i] == 0) {
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continue;
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} else if (channel[i] == ((1u << size[i]) - 1)) {
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channel[i] = 0xFFFFu;
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} else {
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// Need 32 bits to avoid overflow
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uint32_t tmp = channel[i];
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channel[i] = (uint16_t) (((tmp << 16) + 0x8000) >> size[i]);
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}
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size[i] = 16;
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}
|
|
}
|
|
|
|
void unquantizeSigned() {
|
|
for (int i = 0; i < RGBfChannels; i++) {
|
|
if (size[i] >= 16 || channel[i] == 0) {
|
|
continue;
|
|
}
|
|
|
|
int16_t value = (int16_t)channel[i];
|
|
int32_t result = value;
|
|
bool signBit = value < 0;
|
|
if (signBit) {
|
|
value = -value;
|
|
}
|
|
|
|
if (value >= ((1 << (size[i] - 1)) - 1)) {
|
|
result = 0x7FFF;
|
|
} else {
|
|
// Need 32 bits to avoid overflow
|
|
int32_t tmp = value;
|
|
result = (((tmp << 15) + 0x4000) >> (size[i] - 1));
|
|
}
|
|
|
|
if (signBit) {
|
|
result = -result;
|
|
}
|
|
|
|
channel[i] = (uint16_t) result;
|
|
size[i] = 16;
|
|
}
|
|
}
|
|
};
|
|
|
|
struct Data {
|
|
uint64_t low64;
|
|
uint64_t high64;
|
|
|
|
Data() = default;
|
|
|
|
Data(uint64_t low64, uint64_t high64)
|
|
: low64(low64), high64(high64) {
|
|
}
|
|
|
|
// Consumes the lowest N bits from from low64 and high64 where N is:
|
|
// abs(MSB - LSB)
|
|
// MSB and LSB come from the block description of the BC6h spec and specify
|
|
// the location of the bits in the returned bitstring.
|
|
//
|
|
// If MSB < LSB, then the bits are reversed. Otherwise, the bitstring is read and
|
|
// shifted without further modification.
|
|
//
|
|
uint32_t consumeBits(uint32_t MSB, uint32_t LSB) {
|
|
bool reversed = MSB < LSB;
|
|
if (reversed) {
|
|
std::swap(MSB, LSB);
|
|
}
|
|
assert(MSB - LSB + 1 < sizeof(uint32_t) * 8);
|
|
|
|
uint32_t numBits = MSB - LSB + 1;
|
|
uint32_t mask = (1 << numBits) - 1;
|
|
// Read the low N bits
|
|
uint32_t bits = (low64 & mask);
|
|
|
|
low64 >>= numBits;
|
|
// Put the low N bits of high64 into the high 64-N bits of low64
|
|
low64 |= (high64 & mask) << (sizeof(high64) * 8 - numBits);
|
|
high64 >>= numBits;
|
|
|
|
if (reversed) {
|
|
uint32_t tmp = 0;
|
|
for (uint32_t numSwaps = 0; numSwaps < numBits; numSwaps++) {
|
|
tmp <<= 1;
|
|
tmp |= (bits & 1);
|
|
bits >>= 1;
|
|
}
|
|
|
|
bits = tmp;
|
|
}
|
|
|
|
return bits << LSB;
|
|
}
|
|
};
|
|
|
|
struct IndexInfo {
|
|
uint64_t value;
|
|
int numBits;
|
|
};
|
|
|
|
// Interpolates between two endpoints, then does a final unquantization step
|
|
Color interpolate(RGBf e0, RGBf e1, const IndexInfo &index, bool isSigned) {
|
|
static constexpr uint32_t weights3[] = {0, 9, 18, 27, 37, 46, 55, 64};
|
|
static constexpr uint32_t weights4[] = {0, 4, 9, 13, 17, 21, 26, 30,
|
|
34, 38, 43, 47, 51, 55, 60, 64};
|
|
static constexpr uint32_t const *weightsN[] = {
|
|
nullptr, nullptr, nullptr, weights3, weights4
|
|
};
|
|
auto weights = weightsN[index.numBits];
|
|
assert(weights != nullptr);
|
|
Color color;
|
|
uint32_t e0Weight = 64 - weights[index.value];
|
|
uint32_t e1Weight = weights[index.value];
|
|
|
|
for (int i = 0; i < RGBfChannels; i++) {
|
|
int32_t e0Channel = e0.channel[i];
|
|
int32_t e1Channel = e1.channel[i];
|
|
|
|
if (isSigned) {
|
|
e0Channel = extendSign(e0Channel, 16);
|
|
e1Channel = extendSign(e1Channel, 16);
|
|
}
|
|
|
|
int32_t e0Value = e0Channel * e0Weight;
|
|
int32_t e1Value = e1Channel * e1Weight;
|
|
|
|
uint32_t tmp = ((e0Value + e1Value + 32) >> 6);
|
|
|
|
// Need to unquantize value to limit it to the legal range of half-precision
|
|
// floats. We do this by scaling by 31/32 or 31/64 depending on if the value
|
|
// is signed or unsigned.
|
|
if (isSigned) {
|
|
tmp = ((tmp & 0x80000000) != 0) ? (((~tmp + 1) * 31) >> 5) | 0x8000 : (tmp * 31) >> 5;
|
|
// Don't return -0.0f, just normalize it to 0.0f.
|
|
if (tmp == 0x8000)
|
|
tmp = 0;
|
|
} else {
|
|
tmp = (tmp * 31) >> 6;
|
|
}
|
|
|
|
color.channel[i] = (uint16_t) tmp;
|
|
}
|
|
|
|
return color;
|
|
}
|
|
|
|
enum DataType {
|
|
// Endpoints
|
|
EP0 = 0,
|
|
EP1 = 1,
|
|
EP2 = 2,
|
|
EP3 = 3,
|
|
Mode,
|
|
Partition,
|
|
End,
|
|
};
|
|
|
|
enum Channel {
|
|
R = 0,
|
|
G = 1,
|
|
B = 2,
|
|
None,
|
|
};
|
|
|
|
struct DeltaBits {
|
|
size_t channel[3];
|
|
|
|
constexpr DeltaBits()
|
|
: channel{0, 0, 0} {
|
|
}
|
|
|
|
constexpr DeltaBits(size_t r, size_t g, size_t b)
|
|
: channel{r, g, b} {
|
|
}
|
|
};
|
|
|
|
struct ModeDesc {
|
|
int number;
|
|
bool hasDelta;
|
|
int partitionCount;
|
|
int endpointBits;
|
|
DeltaBits deltaBits;
|
|
|
|
constexpr ModeDesc()
|
|
: number(-1), hasDelta(false), partitionCount(0), endpointBits(0) {
|
|
}
|
|
|
|
constexpr ModeDesc(int number, bool hasDelta, int partitionCount, int endpointBits, DeltaBits deltaBits)
|
|
: number(number), hasDelta(hasDelta), partitionCount(partitionCount), endpointBits(endpointBits), deltaBits(deltaBits) {
|
|
}
|
|
};
|
|
|
|
struct BlockDesc {
|
|
DataType type;
|
|
Channel channel;
|
|
int MSB;
|
|
int LSB;
|
|
ModeDesc modeDesc;
|
|
|
|
constexpr BlockDesc()
|
|
: type(End), channel(None), MSB(0), LSB(0), modeDesc() {
|
|
}
|
|
|
|
constexpr BlockDesc(const DataType type, Channel channel, int MSB, int LSB, ModeDesc modeDesc)
|
|
: type(type), channel(channel), MSB(MSB), LSB(LSB), modeDesc(modeDesc) {
|
|
}
|
|
|
|
constexpr BlockDesc(DataType type, Channel channel, int MSB, int LSB)
|
|
: type(type), channel(channel), MSB(MSB), LSB(LSB), modeDesc() {
|
|
}
|
|
};
|
|
|
|
// Turns a legal mode into an index into the BlockDesc table.
|
|
// Illegal or reserved modes return -1.
|
|
static int modeToIndex(uint8_t mode) {
|
|
if (mode <= 3) {
|
|
return mode;
|
|
} else if ((mode & 0x2) != 0) {
|
|
if (mode <= 18) {
|
|
// Turns 6 into 4, 7 into 5, 10 into 6, etc.
|
|
return (mode / 2) + 1 + (mode & 0x1);
|
|
} else if (mode == 22 || mode == 26 || mode == 30) {
|
|
// Turns 22 into 11, 26 into 12, etc.
|
|
return mode / 4 + 6;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
// Returns a description of the bitfields for each mode from the LSB
|
|
// to the MSB before the index data starts.
|
|
//
|
|
// The numbers come from the BC6h block description. Each BlockDesc in the
|
|
// {Type, Channel, MSB, LSB}
|
|
// * Type describes which endpoint this is, or if this is a mode, a partition
|
|
// number, or the end of the block description.
|
|
// * Channel describes one of the 3 color channels within an endpoint
|
|
// * MSB and LSB specificy:
|
|
// * The size of the bitfield being read
|
|
// * The position of the bitfield within the variable it is being read to
|
|
// * If the bitfield is stored in reverse bit order
|
|
// If MSB < LSB then the bitfield is stored in reverse order. The size of
|
|
// the bitfield is abs(MSB-LSB+1). And the position of the bitfield within
|
|
// the variable is min(LSB, MSB).
|
|
//
|
|
// Invalid or reserved modes return an empty list.
|
|
static constexpr int NumBlocks = 14;
|
|
// The largest number of descriptions within a block.
|
|
static constexpr int MaxBlockDescIndex = 26;
|
|
static constexpr BlockDesc blockDescs[NumBlocks][MaxBlockDescIndex] = {
|
|
// @fmt:off
|
|
// Mode 0, Index 0
|
|
{
|
|
{ Mode, None, 1, 0, { 0, true, 2, 10, { 5, 5, 5 } } },
|
|
{ EP2, G, 4, 4 }, { EP2, B, 4, 4 }, { EP3, B, 4, 4 },
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 4, 0 }, { EP3, G, 4, 4 }, { EP2, G, 3, 0 },
|
|
{ EP1, G, 4, 0 }, { EP3, B, 0, 0 }, { EP3, G, 3, 0 },
|
|
{ EP1, B, 4, 0 }, { EP3, B, 1, 1 }, { EP2, B, 3, 0 },
|
|
{ EP2, R, 4, 0 }, { EP3, B, 2, 2 }, { EP3, R, 4, 0 },
|
|
{ EP3, B, 3, 3 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 1, Index 1
|
|
{
|
|
{ Mode, None, 1, 0, { 1, true, 2, 7, { 6, 6, 6 } } },
|
|
{ EP2, G, 5, 5 }, { EP3, G, 5, 4 }, { EP0, R, 6, 0 },
|
|
{ EP3, B, 1, 0 }, { EP2, B, 4, 4 }, { EP0, G, 6, 0 },
|
|
{ EP2, B, 5, 5 }, { EP3, B, 2, 2 }, { EP2, G, 4, 4 },
|
|
{ EP0, B, 6, 0 }, { EP3, B, 3, 3 }, { EP3, B, 5, 5 },
|
|
{ EP3, B, 4, 4 }, { EP1, R, 5, 0 }, { EP2, G, 3, 0 },
|
|
{ EP1, G, 5, 0 }, { EP3, G, 3, 0 }, { EP1, B, 5, 0 },
|
|
{ EP2, B, 3, 0 }, { EP2, R, 5, 0 }, { EP3, R, 5, 0 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 2, Index 2
|
|
{
|
|
{ Mode, None, 4, 0, { 2, true, 2, 11, { 5, 4, 4 } } },
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 4, 0 }, { EP0, R, 10, 10 }, { EP2, G, 3, 0 },
|
|
{ EP1, G, 3, 0 }, { EP0, G, 10, 10 }, { EP3, B, 0, 0 },
|
|
{ EP3, G, 3, 0 }, { EP1, B, 3, 0 }, { EP0, B, 10, 10 },
|
|
{ EP3, B, 1, 1 }, { EP2, B, 3, 0 }, { EP2, R, 4, 0 },
|
|
{ EP3, B, 2, 2 }, { EP3, R, 4, 0 }, { EP3, B, 3, 3 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 3, Index 3
|
|
{
|
|
{ Mode, None, 4, 0, { 3, false, 1, 10, { 0, 0, 0 } } },
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 9, 0 }, { EP1, G, 9, 0 }, { EP1, B, 9, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 6, Index 4
|
|
{
|
|
{ Mode, None, 4, 0, { 6, true, 2, 11, { 4, 5, 4 } } }, // 1 1
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 3, 0 }, { EP0, R, 10, 10 }, { EP3, G, 4, 4 },
|
|
{ EP2, G, 3, 0 }, { EP1, G, 4, 0 }, { EP0, G, 10, 10 },
|
|
{ EP3, G, 3, 0 }, { EP1, B, 3, 0 }, { EP0, B, 10, 10 },
|
|
{ EP3, B, 1, 1 }, { EP2, B, 3, 0 }, { EP2, R, 3, 0 },
|
|
{ EP3, B, 0, 0 }, { EP3, B, 2, 2 }, { EP3, R, 3, 0 }, // 18 19
|
|
{ EP2, G, 4, 4 }, { EP3, B, 3, 3 }, // 2 21
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 7, Index 5
|
|
{
|
|
{ Mode, None, 4, 0, { 7, true, 1, 11, { 9, 9, 9 } } },
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 8, 0 }, { EP0, R, 10, 10 }, { EP1, G, 8, 0 },
|
|
{ EP0, G, 10, 10 }, { EP1, B, 8, 0 }, { EP0, B, 10, 10 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 10, Index 6
|
|
{
|
|
{ Mode, None, 4, 0, { 10, true, 2, 11, { 4, 4, 5 } } },
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 3, 0 }, { EP0, R, 10, 10 }, { EP2, B, 4, 4 },
|
|
{ EP2, G, 3, 0 }, { EP1, G, 3, 0 }, { EP0, G, 10, 10 },
|
|
{ EP3, B, 0, 0 }, { EP3, G, 3, 0 }, { EP1, B, 4, 0 },
|
|
{ EP0, B, 10, 10 }, { EP2, B, 3, 0 }, { EP2, R, 3, 0 },
|
|
{ EP3, B, 1, 1 }, { EP3, B, 2, 2 }, { EP3, R, 3, 0 },
|
|
{ EP3, B, 4, 4 }, { EP3, B, 3, 3 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 11, Index 7
|
|
{
|
|
{ Mode, None, 4, 0, { 11, true, 1, 12, { 8, 8, 8 } } },
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 7, 0 }, { EP0, R, 10, 11 }, { EP1, G, 7, 0 },
|
|
{ EP0, G, 10, 11 }, { EP1, B, 7, 0 }, { EP0, B, 10, 11 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 14, Index 8
|
|
{
|
|
{ Mode, None, 4, 0, { 14, true, 2, 9, { 5, 5, 5 } } },
|
|
{ EP0, R, 8, 0 }, { EP2, B, 4, 4 }, { EP0, G, 8, 0 },
|
|
{ EP2, G, 4, 4 }, { EP0, B, 8, 0 }, { EP3, B, 4, 4 },
|
|
{ EP1, R, 4, 0 }, { EP3, G, 4, 4 }, { EP2, G, 3, 0 },
|
|
{ EP1, G, 4, 0 }, { EP3, B, 0, 0 }, { EP3, G, 3, 0 },
|
|
{ EP1, B, 4, 0 }, { EP3, B, 1, 1 }, { EP2, B, 3, 0 },
|
|
{ EP2, R, 4, 0 }, { EP3, B, 2, 2 }, { EP3, R, 4, 0 },
|
|
{ EP3, B, 3, 3 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 15, Index 9
|
|
{
|
|
{ Mode, None, 4, 0, { 15, true, 1, 16, { 4, 4, 4 } } },
|
|
{ EP0, R, 9, 0 }, { EP0, G, 9, 0 }, { EP0, B, 9, 0 },
|
|
{ EP1, R, 3, 0 }, { EP0, R, 10, 15 }, { EP1, G, 3, 0 },
|
|
{ EP0, G, 10, 15 }, { EP1, B, 3, 0 }, { EP0, B, 10, 15 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 18, Index 10
|
|
{
|
|
{ Mode, None, 4, 0, { 18, true, 2, 8, { 6, 5, 5 } } },
|
|
{ EP0, R, 7, 0 }, { EP3, G, 4, 4 }, { EP2, B, 4, 4 },
|
|
{ EP0, G, 7, 0 }, { EP3, B, 2, 2 }, { EP2, G, 4, 4 },
|
|
{ EP0, B, 7, 0 }, { EP3, B, 3, 3 }, { EP3, B, 4, 4 },
|
|
{ EP1, R, 5, 0 }, { EP2, G, 3, 0 }, { EP1, G, 4, 0 },
|
|
{ EP3, B, 0, 0 }, { EP3, G, 3, 0 }, { EP1, B, 4, 0 },
|
|
{ EP3, B, 1, 1 }, { EP2, B, 3, 0 }, { EP2, R, 5, 0 },
|
|
{ EP3, R, 5, 0 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 22, Index 11
|
|
{
|
|
{ Mode, None, 4, 0, { 22, true, 2, 8, { 5, 6, 5 } } },
|
|
{ EP0, R, 7, 0 }, { EP3, B, 0, 0 }, { EP2, B, 4, 4 },
|
|
{ EP0, G, 7, 0 }, { EP2, G, 5, 5 }, { EP2, G, 4, 4 },
|
|
{ EP0, B, 7, 0 }, { EP3, G, 5, 5 }, { EP3, B, 4, 4 },
|
|
{ EP1, R, 4, 0 }, { EP3, G, 4, 4 }, { EP2, G, 3, 0 },
|
|
{ EP1, G, 5, 0 }, { EP3, G, 3, 0 }, { EP1, B, 4, 0 },
|
|
{ EP3, B, 1, 1 }, { EP2, B, 3, 0 }, { EP2, R, 4, 0 },
|
|
{ EP3, B, 2, 2 }, { EP3, R, 4, 0 }, { EP3, B, 3, 3 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 26, Index 12
|
|
{
|
|
{ Mode, None, 4, 0, { 26, true, 2, 8, { 5, 5, 6 } } },
|
|
{ EP0, R, 7, 0 }, { EP3, B, 1, 1 }, { EP2, B, 4, 4 },
|
|
{ EP0, G, 7, 0 }, { EP2, B, 5, 5 }, { EP2, G, 4, 4 },
|
|
{ EP0, B, 7, 0 }, { EP3, B, 5, 5 }, { EP3, B, 4, 4 },
|
|
{ EP1, R, 4, 0 }, { EP3, G, 4, 4 }, { EP2, G, 3, 0 },
|
|
{ EP1, G, 4, 0 }, { EP3, B, 0, 0 }, { EP3, G, 3, 0 },
|
|
{ EP1, B, 5, 0 }, { EP2, B, 3, 0 }, { EP2, R, 4, 0 },
|
|
{ EP3, B, 2, 2 }, { EP3, R, 4, 0 }, { EP3, B, 3, 3 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
},
|
|
// Mode 30, Index 13
|
|
{
|
|
{ Mode, None, 4, 0, { 30, false, 2, 6, { 0, 0, 0 } } },
|
|
{ EP0, R, 5, 0 }, { EP3, G, 4, 4 }, { EP3, B, 0, 0 },
|
|
{ EP3, B, 1, 1 }, { EP2, B, 4, 4 }, { EP0, G, 5, 0 },
|
|
{ EP2, G, 5, 5 }, { EP2, B, 5, 5 }, { EP3, B, 2, 2 },
|
|
{ EP2, G, 4, 4 }, { EP0, B, 5, 0 }, { EP3, G, 5, 5 },
|
|
{ EP3, B, 3, 3 }, { EP3, B, 5, 5 }, { EP3, B, 4, 4 },
|
|
{ EP1, R, 5, 0 }, { EP2, G, 3, 0 }, { EP1, G, 5, 0 },
|
|
{ EP3, G, 3, 0 }, { EP1, B, 5, 0 }, { EP2, B, 3, 0 },
|
|
{ EP2, R, 5, 0 }, { EP3, R, 5, 0 },
|
|
{ Partition, None, 4, 0 },
|
|
{ End, None, 0, 0},
|
|
}
|
|
// @fmt:on
|
|
};
|
|
|
|
struct Block {
|
|
uint64_t low64;
|
|
uint64_t high64;
|
|
|
|
void decode(uint8_t *dst, size_t dstX, size_t dstY, size_t dstWidth, size_t dstHeight, size_t dstPitch, size_t dstBpp, bool isSigned) const {
|
|
uint8_t mode = 0;
|
|
Data data(low64, high64);
|
|
assert(dstBpp == sizeof(Color));
|
|
|
|
if ((data.low64 & 0x2) == 0) {
|
|
mode = data.consumeBits(1, 0);
|
|
} else {
|
|
mode = data.consumeBits(4, 0);
|
|
}
|
|
|
|
int blockIndex = modeToIndex(mode);
|
|
// Handle illegal or reserved mode
|
|
if (blockIndex == -1) {
|
|
for (int y = 0; y < 4 && y + dstY < dstHeight; y++) {
|
|
for (int x = 0; x < 4 && x + dstX < dstWidth; x++) {
|
|
auto out = reinterpret_cast<Color *>(dst + sizeof(Color) * x + dstPitch * y);
|
|
out->rgba = {0, 0, 0};
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
const BlockDesc *blockDesc = blockDescs[blockIndex];
|
|
|
|
RGBf e[4];
|
|
e[0].isSigned = e[1].isSigned = e[2].isSigned = e[3].isSigned = isSigned;
|
|
|
|
int partition = 0;
|
|
ModeDesc modeDesc;
|
|
for (int index = 0; blockDesc[index].type != End; index++) {
|
|
const BlockDesc desc = blockDesc[index];
|
|
|
|
switch (desc.type) {
|
|
case Mode:
|
|
modeDesc = desc.modeDesc;
|
|
assert(modeDesc.number == mode);
|
|
|
|
e[0].size[0] = e[0].size[1] = e[0].size[2] = modeDesc.endpointBits;
|
|
for (int i = 0; i < RGBfChannels; i++) {
|
|
if (modeDesc.hasDelta) {
|
|
e[1].size[i] = e[2].size[i] = e[3].size[i] = modeDesc.deltaBits.channel[i];
|
|
} else {
|
|
e[1].size[i] = e[2].size[i] = e[3].size[i] = modeDesc.endpointBits;
|
|
}
|
|
}
|
|
break;
|
|
case Partition:
|
|
partition |= data.consumeBits(desc.MSB, desc.LSB);
|
|
break;
|
|
case EP0:
|
|
case EP1:
|
|
case EP2:
|
|
case EP3:
|
|
e[desc.type].channel[desc.channel] |= data.consumeBits(desc.MSB, desc.LSB);
|
|
break;
|
|
default:
|
|
assert(false);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Sign extension
|
|
if (isSigned) {
|
|
for (int ep = 0; ep < modeDesc.partitionCount * 2; ep++) {
|
|
e[ep].extendSign();
|
|
}
|
|
} else if (modeDesc.hasDelta) {
|
|
// Don't sign-extend the base endpoint in an unsigned format.
|
|
for (int ep = 1; ep < modeDesc.partitionCount * 2; ep++) {
|
|
e[ep].extendSign();
|
|
}
|
|
}
|
|
|
|
// Turn the deltas into endpoints
|
|
if (modeDesc.hasDelta) {
|
|
for (int ep = 1; ep < modeDesc.partitionCount * 2; ep++) {
|
|
e[ep].resolveDelta(e[0]);
|
|
}
|
|
}
|
|
|
|
for (int ep = 0; ep < modeDesc.partitionCount * 2; ep++) {
|
|
e[ep].unquantize();
|
|
}
|
|
|
|
// Get the indices, calculate final colors, and output
|
|
for (int y = 0; y < 4; y++) {
|
|
for (int x = 0; x < 4; x++) {
|
|
int pixelNum = x + y * 4;
|
|
IndexInfo idx;
|
|
bool isAnchor = false;
|
|
int firstEndpoint = 0;
|
|
// Bc6H can have either 1 or 2 petitions depending on the mode.
|
|
// The number of petitions affects the number of indices with implicit
|
|
// leading 0 bits and the number of bits per index.
|
|
if (modeDesc.partitionCount == 1) {
|
|
idx.numBits = 4;
|
|
// There's an implicit leading 0 bit for the first idx
|
|
isAnchor = (pixelNum == 0);
|
|
} else {
|
|
idx.numBits = 3;
|
|
// There are 2 indices with implicit leading 0-bits.
|
|
isAnchor = ((pixelNum == 0) || (pixelNum == AnchorTable2[partition]));
|
|
firstEndpoint = PartitionTable2[partition][pixelNum] * 2;
|
|
}
|
|
|
|
idx.value = data.consumeBits(idx.numBits - isAnchor - 1, 0);
|
|
|
|
// Don't exit the loop early, we need to consume these index bits regardless if
|
|
// we actually output them or not.
|
|
if ((y + dstY >= dstHeight) || (x + dstX >= dstWidth)) {
|
|
continue;
|
|
}
|
|
|
|
Color color = interpolate(e[firstEndpoint], e[firstEndpoint + 1], idx, isSigned);
|
|
auto out = reinterpret_cast<Color *>(dst + dstBpp * x + dstPitch * y);
|
|
*out = color;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
} // namespace BC6H
|
|
|
|
namespace BC7 {
|
|
// https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_texture_compression_bptc.txt
|
|
// https://docs.microsoft.com/en-us/windows/win32/direct3d11/bc7-format
|
|
|
|
struct Bitfield {
|
|
int offset;
|
|
int count;
|
|
|
|
constexpr Bitfield Then(const int bits) { return {offset + count, bits}; }
|
|
|
|
constexpr bool operator==(const Bitfield &rhs) {
|
|
return offset == rhs.offset && count == rhs.count;
|
|
}
|
|
};
|
|
|
|
struct Mode {
|
|
const int IDX; // Mode index
|
|
const int NS; // Number of subsets in each partition
|
|
const int PB; // Partition bits
|
|
const int RB; // Rotation bits
|
|
const int ISB; // Index selection bits
|
|
const int CB; // Color bits
|
|
const int AB; // Alpha bits
|
|
const int EPB; // Endpoint P-bits
|
|
const int SPB; // Shared P-bits
|
|
const int IB; // Primary index bits per element
|
|
const int IBC; // Primary index bits total
|
|
const int IB2; // Secondary index bits per element
|
|
|
|
constexpr int NumColors() const { return NS * 2; }
|
|
|
|
constexpr Bitfield Partition() const { return {IDX + 1, PB}; }
|
|
|
|
constexpr Bitfield Rotation() const { return Partition().Then(RB); }
|
|
|
|
constexpr Bitfield IndexSelection() const { return Rotation().Then(ISB); }
|
|
|
|
constexpr Bitfield Red(int idx) const {
|
|
return IndexSelection().Then(CB * idx).Then(CB);
|
|
}
|
|
|
|
constexpr Bitfield Green(int idx) const {
|
|
return Red(NumColors() - 1).Then(CB * idx).Then(CB);
|
|
}
|
|
|
|
constexpr Bitfield Blue(int idx) const {
|
|
return Green(NumColors() - 1).Then(CB * idx).Then(CB);
|
|
}
|
|
|
|
constexpr Bitfield Alpha(int idx) const {
|
|
return Blue(NumColors() - 1).Then(AB * idx).Then(AB);
|
|
}
|
|
|
|
constexpr Bitfield EndpointPBit(int idx) const {
|
|
return Alpha(NumColors() - 1).Then(EPB * idx).Then(EPB);
|
|
}
|
|
|
|
constexpr Bitfield SharedPBit0() const {
|
|
return EndpointPBit(NumColors() - 1).Then(SPB);
|
|
}
|
|
|
|
constexpr Bitfield SharedPBit1() const {
|
|
return SharedPBit0().Then(SPB);
|
|
}
|
|
|
|
constexpr Bitfield PrimaryIndex(int offset, int count) const {
|
|
return SharedPBit1().Then(offset).Then(count);
|
|
}
|
|
|
|
constexpr Bitfield SecondaryIndex(int offset, int count) const {
|
|
return SharedPBit1().Then(IBC + offset).Then(count);
|
|
}
|
|
};
|
|
|
|
static constexpr Mode Modes[] = {
|
|
// IDX NS PB RB ISB CB AB EPB SPB IB IBC, IB2
|
|
/**/ {0x0, 0x3, 0x4, 0x0, 0x0, 0x4, 0x0, 0x1, 0x0, 0x3, 0x2d, 0x0},
|
|
/**/ {0x1, 0x2, 0x6, 0x0, 0x0, 0x6, 0x0, 0x0, 0x1, 0x3, 0x2e, 0x0},
|
|
/**/ {0x2, 0x3, 0x6, 0x0, 0x0, 0x5, 0x0, 0x0, 0x0, 0x2, 0x1d, 0x0},
|
|
/**/ {0x3, 0x2, 0x6, 0x0, 0x0, 0x7, 0x0, 0x1, 0x0, 0x2, 0x1e, 0x0},
|
|
/**/ {0x4, 0x1, 0x0, 0x2, 0x1, 0x5, 0x6, 0x0, 0x0, 0x2, 0x1f, 0x3},
|
|
/**/ {0x5, 0x1, 0x0, 0x2, 0x0, 0x7, 0x8, 0x0, 0x0, 0x2, 0x1f, 0x2},
|
|
/**/ {0x6, 0x1, 0x0, 0x0, 0x0, 0x7, 0x7, 0x1, 0x0, 0x4, 0x3f, 0x0},
|
|
/**/ {0x7, 0x2, 0x6, 0x0, 0x0, 0x5, 0x5, 0x1, 0x0, 0x2, 0x1e, 0x0},
|
|
/**/ {-1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x00, 0x0},
|
|
};
|
|
|
|
static constexpr int MaxPartitions = 64;
|
|
static constexpr int MaxSubsets = 3;
|
|
|
|
static constexpr uint8_t PartitionTable2[MaxPartitions][16] = {
|
|
{0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1},
|
|
{0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1},
|
|
{0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1},
|
|
{0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1},
|
|
{0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1},
|
|
{0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 1},
|
|
{0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1},
|
|
{0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1},
|
|
{0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0},
|
|
{0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0},
|
|
{0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0},
|
|
{0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0},
|
|
{0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1},
|
|
{0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0},
|
|
{0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0},
|
|
{0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0},
|
|
{0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0},
|
|
{0, 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0},
|
|
{0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0},
|
|
{0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0},
|
|
{0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0},
|
|
{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1},
|
|
{0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1},
|
|
{0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0},
|
|
{0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0},
|
|
{0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0},
|
|
{0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0},
|
|
{0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1},
|
|
{0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 1},
|
|
{0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0},
|
|
{0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0},
|
|
{0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0},
|
|
{0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0},
|
|
{0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0},
|
|
{0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1},
|
|
{0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1},
|
|
{0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0},
|
|
{0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0},
|
|
{0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0},
|
|
{0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0},
|
|
{0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0},
|
|
{0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1},
|
|
{0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1},
|
|
{0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0},
|
|
{0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0},
|
|
{0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1},
|
|
{0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1},
|
|
{0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1},
|
|
{0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1},
|
|
{0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1},
|
|
{0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0},
|
|
{0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0},
|
|
{0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1},
|
|
};
|
|
|
|
static constexpr uint8_t PartitionTable3[MaxPartitions][16] = {
|
|
{0, 0, 1, 1, 0, 0, 1, 1, 0, 2, 2, 1, 2, 2, 2, 2},
|
|
{0, 0, 0, 1, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2, 2, 1},
|
|
{0, 0, 0, 0, 2, 0, 0, 1, 2, 2, 1, 1, 2, 2, 1, 1},
|
|
{0, 2, 2, 2, 0, 0, 2, 2, 0, 0, 1, 1, 0, 1, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2},
|
|
{0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 2, 2, 0, 0, 2, 2},
|
|
{0, 0, 2, 2, 0, 0, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1},
|
|
{0, 0, 1, 1, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2},
|
|
{0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2},
|
|
{0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2},
|
|
{0, 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2},
|
|
{0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2},
|
|
{0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 2, 0, 1, 2, 2},
|
|
{0, 0, 1, 1, 0, 1, 1, 2, 1, 1, 2, 2, 1, 2, 2, 2},
|
|
{0, 0, 1, 1, 2, 0, 0, 1, 2, 2, 0, 0, 2, 2, 2, 0},
|
|
{0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 2, 1, 1, 2, 2},
|
|
{0, 1, 1, 1, 0, 0, 1, 1, 2, 0, 0, 1, 2, 2, 0, 0},
|
|
{0, 0, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2},
|
|
{0, 0, 2, 2, 0, 0, 2, 2, 0, 0, 2, 2, 1, 1, 1, 1},
|
|
{0, 1, 1, 1, 0, 1, 1, 1, 0, 2, 2, 2, 0, 2, 2, 2},
|
|
{0, 0, 0, 1, 0, 0, 0, 1, 2, 2, 2, 1, 2, 2, 2, 1},
|
|
{0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 2, 2, 0, 1, 2, 2},
|
|
{0, 0, 0, 0, 1, 1, 0, 0, 2, 2, 1, 0, 2, 2, 1, 0},
|
|
{0, 1, 2, 2, 0, 1, 2, 2, 0, 0, 1, 1, 0, 0, 0, 0},
|
|
{0, 0, 1, 2, 0, 0, 1, 2, 1, 1, 2, 2, 2, 2, 2, 2},
|
|
{0, 1, 1, 0, 1, 2, 2, 1, 1, 2, 2, 1, 0, 1, 1, 0},
|
|
{0, 0, 0, 0, 0, 1, 1, 0, 1, 2, 2, 1, 1, 2, 2, 1},
|
|
{0, 0, 2, 2, 1, 1, 0, 2, 1, 1, 0, 2, 0, 0, 2, 2},
|
|
{0, 1, 1, 0, 0, 1, 1, 0, 2, 0, 0, 2, 2, 2, 2, 2},
|
|
{0, 0, 1, 1, 0, 1, 2, 2, 0, 1, 2, 2, 0, 0, 1, 1},
|
|
{0, 0, 0, 0, 2, 0, 0, 0, 2, 2, 1, 1, 2, 2, 2, 1},
|
|
{0, 0, 0, 0, 0, 0, 0, 2, 1, 1, 2, 2, 1, 2, 2, 2},
|
|
{0, 2, 2, 2, 0, 0, 2, 2, 0, 0, 1, 2, 0, 0, 1, 1},
|
|
{0, 0, 1, 1, 0, 0, 1, 2, 0, 0, 2, 2, 0, 2, 2, 2},
|
|
{0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2, 0, 0, 1, 2, 0},
|
|
{0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 0},
|
|
{0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0},
|
|
{0, 1, 2, 0, 2, 0, 1, 2, 1, 2, 0, 1, 0, 1, 2, 0},
|
|
{0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2, 0, 0, 1, 1},
|
|
{0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 0, 0, 0, 0, 1, 1},
|
|
{0, 1, 0, 1, 0, 1, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 2, 1, 2, 1, 2, 1},
|
|
{0, 0, 2, 2, 1, 1, 2, 2, 0, 0, 2, 2, 1, 1, 2, 2},
|
|
{0, 0, 2, 2, 0, 0, 1, 1, 0, 0, 2, 2, 0, 0, 1, 1},
|
|
{0, 2, 2, 0, 1, 2, 2, 1, 0, 2, 2, 0, 1, 2, 2, 1},
|
|
{0, 1, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 0, 1, 0, 1},
|
|
{0, 0, 0, 0, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1},
|
|
{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 2, 2, 2},
|
|
{0, 2, 2, 2, 0, 1, 1, 1, 0, 2, 2, 2, 0, 1, 1, 1},
|
|
{0, 0, 0, 2, 1, 1, 1, 2, 0, 0, 0, 2, 1, 1, 1, 2},
|
|
{0, 0, 0, 0, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2},
|
|
{0, 2, 2, 2, 0, 1, 1, 1, 0, 1, 1, 1, 0, 2, 2, 2},
|
|
{0, 0, 0, 2, 1, 1, 1, 2, 1, 1, 1, 2, 0, 0, 0, 2},
|
|
{0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 2, 2, 2, 2},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 1, 2, 2, 1, 1, 2},
|
|
{0, 1, 1, 0, 0, 1, 1, 0, 2, 2, 2, 2, 2, 2, 2, 2},
|
|
{0, 0, 2, 2, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 2, 2},
|
|
{0, 0, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 0, 0, 2, 2},
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 1, 1, 2},
|
|
{0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1},
|
|
{0, 2, 2, 2, 1, 2, 2, 2, 0, 2, 2, 2, 1, 2, 2, 2},
|
|
{0, 1, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2},
|
|
{0, 1, 1, 1, 2, 0, 1, 1, 2, 2, 0, 1, 2, 2, 2, 0},
|
|
};
|
|
|
|
static constexpr uint8_t AnchorTable2[MaxPartitions] = {
|
|
// @fmt:off
|
|
0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf,
|
|
0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf,
|
|
0xf, 0x2, 0x8, 0x2, 0x2, 0x8, 0x8, 0xf,
|
|
0x2, 0x8, 0x2, 0x2, 0x8, 0x8, 0x2, 0x2,
|
|
0xf, 0xf, 0x6, 0x8, 0x2, 0x8, 0xf, 0xf,
|
|
0x2, 0x8, 0x2, 0x2, 0x2, 0xf, 0xf, 0x6,
|
|
0x6, 0x2, 0x6, 0x8, 0xf, 0xf, 0x2, 0x2,
|
|
0xf, 0xf, 0xf, 0xf, 0xf, 0x2, 0x2, 0xf,
|
|
// @fmt:on
|
|
};
|
|
|
|
static constexpr uint8_t AnchorTable3a[MaxPartitions] = {
|
|
// @fmt:off
|
|
0x3, 0x3, 0xf, 0xf, 0x8, 0x3, 0xf, 0xf,
|
|
0x8, 0x8, 0x6, 0x6, 0x6, 0x5, 0x3, 0x3,
|
|
0x3, 0x3, 0x8, 0xf, 0x3, 0x3, 0x6, 0xa,
|
|
0x5, 0x8, 0x8, 0x6, 0x8, 0x5, 0xf, 0xf,
|
|
0x8, 0xf, 0x3, 0x5, 0x6, 0xa, 0x8, 0xf,
|
|
0xf, 0x3, 0xf, 0x5, 0xf, 0xf, 0xf, 0xf,
|
|
0x3, 0xf, 0x5, 0x5, 0x5, 0x8, 0x5, 0xa,
|
|
0x5, 0xa, 0x8, 0xd, 0xf, 0xc, 0x3, 0x3,
|
|
// @fmt:on
|
|
};
|
|
|
|
static constexpr uint8_t AnchorTable3b[MaxPartitions] = {
|
|
// @fmt:off
|
|
0xf, 0x8, 0x8, 0x3, 0xf, 0xf, 0x3, 0x8,
|
|
0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf, 0x8,
|
|
0xf, 0x8, 0xf, 0x3, 0xf, 0x8, 0xf, 0x8,
|
|
0x3, 0xf, 0x6, 0xa, 0xf, 0xf, 0xa, 0x8,
|
|
0xf, 0x3, 0xf, 0xa, 0xa, 0x8, 0x9, 0xa,
|
|
0x6, 0xf, 0x8, 0xf, 0x3, 0x6, 0x6, 0x8,
|
|
0xf, 0x3, 0xf, 0xf, 0xf, 0xf, 0xf, 0xf,
|
|
0xf, 0xf, 0xf, 0xf, 0x3, 0xf, 0xf, 0x8,
|
|
// @fmt:on
|
|
};
|
|
|
|
struct Color {
|
|
struct RGB {
|
|
RGB() = default;
|
|
|
|
RGB(uint8_t r, uint8_t g, uint8_t b)
|
|
: b(b), g(g), r(r) {}
|
|
|
|
RGB(int r, int g, int b)
|
|
: b(static_cast<uint8_t>(b)), g(static_cast<uint8_t>(g)), r(static_cast<uint8_t>(r)) {}
|
|
|
|
RGB operator<<(int shift) const { return {r << shift, g << shift, b << shift}; }
|
|
|
|
RGB operator>>(int shift) const { return {r >> shift, g >> shift, b >> shift}; }
|
|
|
|
RGB operator|(int bits) const { return {r | bits, g | bits, b | bits}; }
|
|
|
|
RGB operator|(const RGB &rhs) const { return {r | rhs.r, g | rhs.g, b | rhs.b}; }
|
|
|
|
RGB operator+(const RGB &rhs) const { return {r + rhs.r, g + rhs.g, b + rhs.b}; }
|
|
|
|
uint8_t b;
|
|
uint8_t g;
|
|
uint8_t r;
|
|
};
|
|
|
|
RGB rgb;
|
|
uint8_t a;
|
|
};
|
|
|
|
static_assert(sizeof(Color) == 4, "Color size must be 4 bytes");
|
|
|
|
struct Block {
|
|
constexpr uint64_t Get(const Bitfield &bf) const {
|
|
uint64_t mask = (1ULL << bf.count) - 1;
|
|
if (bf.offset + bf.count <= 64) {
|
|
return (low >> bf.offset) & mask;
|
|
}
|
|
if (bf.offset >= 64) {
|
|
return (high >> (bf.offset - 64)) & mask;
|
|
}
|
|
return ((low >> bf.offset) | (high << (64 - bf.offset))) & mask;
|
|
}
|
|
|
|
const Mode &mode() const {
|
|
if ((low & 0b00000001) != 0) {
|
|
return Modes[0];
|
|
}
|
|
if ((low & 0b00000010) != 0) {
|
|
return Modes[1];
|
|
}
|
|
if ((low & 0b00000100) != 0) {
|
|
return Modes[2];
|
|
}
|
|
if ((low & 0b00001000) != 0) {
|
|
return Modes[3];
|
|
}
|
|
if ((low & 0b00010000) != 0) {
|
|
return Modes[4];
|
|
}
|
|
if ((low & 0b00100000) != 0) {
|
|
return Modes[5];
|
|
}
|
|
if ((low & 0b01000000) != 0) {
|
|
return Modes[6];
|
|
}
|
|
if ((low & 0b10000000) != 0) {
|
|
return Modes[7];
|
|
}
|
|
return Modes[8]; // Invalid mode
|
|
}
|
|
|
|
struct IndexInfo {
|
|
uint64_t value;
|
|
int numBits;
|
|
};
|
|
|
|
uint8_t interpolate(uint8_t e0, uint8_t e1, const IndexInfo &index) const {
|
|
static constexpr uint16_t weights2[] = {0, 21, 43, 64};
|
|
static constexpr uint16_t weights3[] = {0, 9, 18, 27, 37, 46, 55, 64};
|
|
static constexpr uint16_t weights4[] = {0, 4, 9, 13, 17, 21, 26, 30,
|
|
34, 38, 43, 47, 51, 55, 60, 64};
|
|
static constexpr uint16_t const *weightsN[] = {
|
|
nullptr, nullptr, weights2, weights3, weights4
|
|
};
|
|
auto weights = weightsN[index.numBits];
|
|
assert(weights != nullptr);
|
|
return (uint8_t) (((64 - weights[index.value]) * uint16_t(e0) + weights[index.value] * uint16_t(e1) + 32) >> 6);
|
|
}
|
|
|
|
void decode(uint8_t *dst, size_t dstX, size_t dstY, size_t dstWidth, size_t dstHeight, size_t dstPitch) const {
|
|
auto const &mode = this->mode();
|
|
|
|
if (mode.IDX < 0) // Invalid mode:
|
|
{
|
|
for (size_t y = 0; y < 4 && y + dstY < dstHeight; y++) {
|
|
for (size_t x = 0; x < 4 && x + dstX < dstWidth; x++) {
|
|
auto out = reinterpret_cast<Color *>(dst + sizeof(Color) * x + dstPitch * y);
|
|
out->rgb = {0, 0, 0};
|
|
out->a = 0;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
using Endpoint = std::array<Color, 2>;
|
|
std::array<Endpoint, MaxSubsets> subsets;
|
|
|
|
for (size_t i = 0; i < mode.NS; i++) {
|
|
auto &subset = subsets[i];
|
|
subset[0].rgb.r = Get(mode.Red(i * 2 + 0));
|
|
subset[0].rgb.g = Get(mode.Green(i * 2 + 0));
|
|
subset[0].rgb.b = Get(mode.Blue(i * 2 + 0));
|
|
subset[0].a = (mode.AB > 0) ? Get(mode.Alpha(i * 2 + 0)) : 255;
|
|
|
|
subset[1].rgb.r = Get(mode.Red(i * 2 + 1));
|
|
subset[1].rgb.g = Get(mode.Green(i * 2 + 1));
|
|
subset[1].rgb.b = Get(mode.Blue(i * 2 + 1));
|
|
subset[1].a = (mode.AB > 0) ? Get(mode.Alpha(i * 2 + 1)) : 255;
|
|
}
|
|
|
|
if (mode.SPB > 0) {
|
|
auto pbit0 = Get(mode.SharedPBit0());
|
|
auto pbit1 = Get(mode.SharedPBit1());
|
|
subsets[0][0].rgb = (subsets[0][0].rgb << 1) | pbit0;
|
|
subsets[0][1].rgb = (subsets[0][1].rgb << 1) | pbit0;
|
|
subsets[1][0].rgb = (subsets[1][0].rgb << 1) | pbit1;
|
|
subsets[1][1].rgb = (subsets[1][1].rgb << 1) | pbit1;
|
|
}
|
|
|
|
if (mode.EPB > 0) {
|
|
for (size_t i = 0; i < mode.NS; i++) {
|
|
auto &subset = subsets[i];
|
|
auto pbit0 = Get(mode.EndpointPBit(i * 2 + 0));
|
|
auto pbit1 = Get(mode.EndpointPBit(i * 2 + 1));
|
|
subset[0].rgb = (subset[0].rgb << 1) | pbit0;
|
|
subset[1].rgb = (subset[1].rgb << 1) | pbit1;
|
|
if (mode.AB > 0) {
|
|
subset[0].a = (subset[0].a << 1) | pbit0;
|
|
subset[1].a = (subset[1].a << 1) | pbit1;
|
|
}
|
|
}
|
|
}
|
|
|
|
auto const colorBits = mode.CB + mode.SPB + mode.EPB;
|
|
auto const alphaBits = mode.AB + mode.SPB + mode.EPB;
|
|
|
|
for (size_t i = 0; i < mode.NS; i++) {
|
|
auto &subset = subsets[i];
|
|
subset[0].rgb = subset[0].rgb << (8 - colorBits);
|
|
subset[1].rgb = subset[1].rgb << (8 - colorBits);
|
|
subset[0].rgb = subset[0].rgb | (subset[0].rgb >> colorBits);
|
|
subset[1].rgb = subset[1].rgb | (subset[1].rgb >> colorBits);
|
|
|
|
if (mode.AB > 0) {
|
|
subset[0].a = subset[0].a << (8 - alphaBits);
|
|
subset[1].a = subset[1].a << (8 - alphaBits);
|
|
subset[0].a = subset[0].a | (subset[0].a >> alphaBits);
|
|
subset[1].a = subset[1].a | (subset[1].a >> alphaBits);
|
|
}
|
|
}
|
|
|
|
int colorIndexBitOffset = 0;
|
|
int alphaIndexBitOffset = 0;
|
|
for (int y = 0; y < 4; y++) {
|
|
for (int x = 0; x < 4; x++) {
|
|
auto texelIdx = y * 4 + x;
|
|
auto partitionIdx = Get(mode.Partition());
|
|
assert(partitionIdx < MaxPartitions);
|
|
auto subsetIdx = subsetIndex(mode, partitionIdx, texelIdx);
|
|
assert(subsetIdx < MaxSubsets);
|
|
auto const &subset = subsets[subsetIdx];
|
|
|
|
auto anchorIdx = anchorIndex(mode, partitionIdx, subsetIdx);
|
|
auto isAnchor = anchorIdx == texelIdx;
|
|
auto colorIdx = colorIndex(mode, isAnchor, colorIndexBitOffset);
|
|
auto alphaIdx = alphaIndex(mode, isAnchor, alphaIndexBitOffset);
|
|
|
|
if (y + dstY >= dstHeight || x + dstX >= dstWidth) {
|
|
// Don't be tempted to skip early at the loops:
|
|
// The calls to colorIndex() and alphaIndex() adjust bit
|
|
// offsets that need to be carefully tracked.
|
|
continue;
|
|
}
|
|
|
|
Color output;
|
|
// Note: We flip r and b channels past this point as the texture storage is BGR while the output is RGB
|
|
output.rgb.r = interpolate(subset[0].rgb.b, subset[1].rgb.b, colorIdx);
|
|
output.rgb.g = interpolate(subset[0].rgb.g, subset[1].rgb.g, colorIdx);
|
|
output.rgb.b = interpolate(subset[0].rgb.r, subset[1].rgb.r, colorIdx);
|
|
output.a = interpolate(subset[0].a, subset[1].a, alphaIdx);
|
|
|
|
switch (Get(mode.Rotation())) {
|
|
default:
|
|
break;
|
|
case 1:
|
|
std::swap(output.a, output.rgb.b);
|
|
break;
|
|
case 2:
|
|
std::swap(output.a, output.rgb.g);
|
|
break;
|
|
case 3:
|
|
std::swap(output.a, output.rgb.r);
|
|
break;
|
|
}
|
|
|
|
auto out = reinterpret_cast<Color *>(dst + sizeof(Color) * x + dstPitch * y);
|
|
*out = output;
|
|
}
|
|
}
|
|
}
|
|
|
|
int subsetIndex(const Mode &mode, int partitionIdx, int texelIndex) const {
|
|
switch (mode.NS) {
|
|
default:
|
|
return 0;
|
|
case 2:
|
|
return PartitionTable2[partitionIdx][texelIndex];
|
|
case 3:
|
|
return PartitionTable3[partitionIdx][texelIndex];
|
|
}
|
|
}
|
|
|
|
int anchorIndex(const Mode &mode, int partitionIdx, int subsetIdx) const {
|
|
// ARB_texture_compression_bptc states:
|
|
// "In partition zero, the anchor index is always index zero.
|
|
// In other partitions, the anchor index is specified by tables
|
|
// Table.A2 and Table.A3.""
|
|
// Note: This is really confusing - I believe they meant subset instead
|
|
// of partition here.
|
|
switch (subsetIdx) {
|
|
default:
|
|
return 0;
|
|
case 1:
|
|
return mode.NS == 2 ? AnchorTable2[partitionIdx] : AnchorTable3a[partitionIdx];
|
|
case 2:
|
|
return AnchorTable3b[partitionIdx];
|
|
}
|
|
}
|
|
|
|
IndexInfo colorIndex(const Mode &mode, bool isAnchor,
|
|
int &indexBitOffset) const {
|
|
// ARB_texture_compression_bptc states:
|
|
// "The index value for interpolating color comes from the secondary
|
|
// index for the texel if the format has an index selection bit and its
|
|
// value is one and from the primary index otherwise.""
|
|
auto idx = Get(mode.IndexSelection());
|
|
assert(idx <= 1);
|
|
bool secondary = idx == 1;
|
|
auto numBits = secondary ? mode.IB2 : mode.IB;
|
|
auto numReadBits = numBits - (isAnchor ? 1 : 0);
|
|
auto index =
|
|
Get(secondary ? mode.SecondaryIndex(indexBitOffset, numReadBits)
|
|
: mode.PrimaryIndex(indexBitOffset, numReadBits));
|
|
indexBitOffset += numReadBits;
|
|
return {index, numBits};
|
|
}
|
|
|
|
IndexInfo alphaIndex(const Mode &mode, bool isAnchor,
|
|
int &indexBitOffset) const {
|
|
// ARB_texture_compression_bptc states:
|
|
// "The alpha index comes from the secondary index if the block has a
|
|
// secondary index and the block either doesn't have an index selection
|
|
// bit or that bit is zero and the primary index otherwise."
|
|
auto idx = Get(mode.IndexSelection());
|
|
assert(idx <= 1);
|
|
bool secondary = (mode.IB2 != 0) && (idx == 0);
|
|
auto numBits = secondary ? mode.IB2 : mode.IB;
|
|
auto numReadBits = numBits - (isAnchor ? 1 : 0);
|
|
auto index =
|
|
Get(secondary ? mode.SecondaryIndex(indexBitOffset, numReadBits)
|
|
: mode.PrimaryIndex(indexBitOffset, numReadBits));
|
|
indexBitOffset += numReadBits;
|
|
return {index, numBits};
|
|
}
|
|
|
|
// Assumes little-endian
|
|
uint64_t low;
|
|
uint64_t high;
|
|
};
|
|
|
|
} // namespace BC7
|
|
} // anonymous namespace
|
|
|
|
namespace bcn {
|
|
constexpr size_t R8Bpp{1}; //!< The amount of bytes per pixel in R8
|
|
constexpr size_t R8g8Bpp{2}; //!< The amount of bytes per pixel in R8G8
|
|
constexpr size_t R8g8b8a8Bpp{4}; //!< The amount of bytes per pixel in R8G8B8A8
|
|
constexpr size_t R16g16b16a16Bpp{8}; //!< The amount of bytes per pixel in R16G16B16
|
|
|
|
void DecodeBc1(const uint8_t *src, uint8_t *dst, size_t x, size_t y, size_t width, size_t height) {
|
|
const auto *color{reinterpret_cast<const BC_color *>(src)};
|
|
size_t pitch{R8g8b8a8Bpp * width};
|
|
color->decode(dst, x, y, width, height, pitch, R8g8b8a8Bpp, true, false);
|
|
}
|
|
|
|
void DecodeBc2(const uint8_t *src, uint8_t *dst, size_t x, size_t y, size_t width, size_t height) {
|
|
const auto *alpha{reinterpret_cast<const BC_alpha *>(src)};
|
|
const auto *color{reinterpret_cast<const BC_color *>(src + 8)};
|
|
size_t pitch{R8g8b8a8Bpp * width};
|
|
color->decode(dst, x, y, width, height, pitch, R8g8b8a8Bpp, false, true);
|
|
alpha->decode(dst, x, y, width, height, pitch, R8g8b8a8Bpp);
|
|
}
|
|
|
|
void DecodeBc3(const uint8_t *src, uint8_t *dst, size_t x, size_t y, size_t width, size_t height) {
|
|
const auto *alpha{reinterpret_cast<const BC_channel *>(src)};
|
|
const auto *color{reinterpret_cast<const BC_color *>(src + 8)};
|
|
size_t pitch{R8g8b8a8Bpp * width};
|
|
color->decode(dst, x, y, width, height, pitch, R8g8b8a8Bpp, false, true);
|
|
alpha->decode(dst, x, y, width, height, pitch, R8g8b8a8Bpp, 3, false);
|
|
}
|
|
|
|
void DecodeBc4(const uint8_t *src, uint8_t *dst, size_t x, size_t y, size_t width, size_t height, bool isSigned) {
|
|
const auto *red{reinterpret_cast<const BC_channel *>(src)};
|
|
size_t pitch{R8Bpp * width};
|
|
red->decode(dst, x, y, width, height, pitch, R8Bpp, 0, isSigned);
|
|
}
|
|
|
|
void DecodeBc5(const uint8_t *src, uint8_t *dst, size_t x, size_t y, size_t width, size_t height, bool isSigned) {
|
|
const auto *red{reinterpret_cast<const BC_channel *>(src)};
|
|
const auto *green{reinterpret_cast<const BC_channel *>(src + 8)};
|
|
size_t pitch{R8g8Bpp * width};
|
|
red->decode(dst, x, y, width, height, pitch, R8g8Bpp, 0, isSigned);
|
|
green->decode(dst, x, y, width, height, pitch, R8g8Bpp, 1, isSigned);
|
|
}
|
|
|
|
void DecodeBc6(const uint8_t *src, uint8_t *dst, size_t x, size_t y, size_t width, size_t height, bool isSigned) {
|
|
const auto *block{reinterpret_cast<const BC6H::Block *>(src)};
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size_t pitch{R16g16b16a16Bpp * width};
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block->decode(dst, x, y, width, height, pitch, R16g16b16a16Bpp, isSigned);
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}
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void DecodeBc7(const uint8_t *src, uint8_t *dst, size_t x, size_t y, size_t width, size_t height) {
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const auto *block{reinterpret_cast<const BC7::Block *>(src)};
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size_t pitch{R8g8b8a8Bpp * width};
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block->decode(dst, x, y, width, height, pitch);
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}
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}
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