1580 lines
47 KiB
C++
1580 lines
47 KiB
C++
// Copyright 2016 The University of North Carolina at Chapel Hill
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Please send all BUG REPORTS to <pavel@cs.unc.edu>.
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// <http://gamma.cs.unc.edu/FasTC/>
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#include <algorithm>
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#include <cassert>
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#include <cstring>
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#include <span>
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#include <vector>
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#include <boost/container/static_vector.hpp>
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#include "common/common_types.h"
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#include "video_core/textures/astc.h"
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class InputBitStream {
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public:
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constexpr explicit InputBitStream(std::span<const u8> data, size_t start_offset = 0)
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: cur_byte{data.data()}, total_bits{data.size()}, next_bit{start_offset % 8} {}
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constexpr size_t GetBitsRead() const {
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return bits_read;
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}
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constexpr bool ReadBit() {
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if (bits_read >= total_bits * 8) {
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return 0;
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}
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const bool bit = ((*cur_byte >> next_bit) & 1) != 0;
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++next_bit;
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while (next_bit >= 8) {
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next_bit -= 8;
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++cur_byte;
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}
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++bits_read;
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return bit;
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}
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constexpr u32 ReadBits(std::size_t nBits) {
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u32 ret = 0;
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for (std::size_t i = 0; i < nBits; ++i) {
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ret |= (ReadBit() & 1) << i;
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}
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return ret;
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}
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template <std::size_t nBits>
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constexpr u32 ReadBits() {
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u32 ret = 0;
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for (std::size_t i = 0; i < nBits; ++i) {
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ret |= (ReadBit() & 1) << i;
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}
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return ret;
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}
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private:
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const u8* cur_byte;
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size_t total_bits = 0;
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size_t next_bit = 0;
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size_t bits_read = 0;
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};
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class OutputBitStream {
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public:
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constexpr explicit OutputBitStream(u8* ptr, std::size_t bits = 0, std::size_t start_offset = 0)
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: cur_byte{ptr}, num_bits{bits}, next_bit{start_offset % 8} {}
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constexpr std::size_t GetBitsWritten() const {
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return bits_written;
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}
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constexpr void WriteBitsR(u32 val, u32 nBits) {
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for (u32 i = 0; i < nBits; i++) {
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WriteBit((val >> (nBits - i - 1)) & 1);
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}
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}
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constexpr void WriteBits(u32 val, u32 nBits) {
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for (u32 i = 0; i < nBits; i++) {
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WriteBit((val >> i) & 1);
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}
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}
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private:
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constexpr void WriteBit(bool b) {
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if (bits_written >= num_bits) {
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return;
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}
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const u32 mask = 1 << next_bit++;
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// clear the bit
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*cur_byte &= static_cast<u8>(~mask);
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// Write the bit, if necessary
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if (b)
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*cur_byte |= static_cast<u8>(mask);
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// Next byte?
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if (next_bit >= 8) {
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cur_byte += 1;
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next_bit = 0;
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}
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}
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u8* cur_byte;
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std::size_t num_bits;
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std::size_t bits_written = 0;
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std::size_t next_bit = 0;
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};
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template <typename IntType>
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class Bits {
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public:
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explicit Bits(const IntType& v) : m_Bits(v) {}
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Bits(const Bits&) = delete;
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Bits& operator=(const Bits&) = delete;
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u8 operator[](u32 bitPos) const {
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return static_cast<u8>((m_Bits >> bitPos) & 1);
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}
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IntType operator()(u32 start, u32 end) const {
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if (start == end) {
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return (*this)[start];
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} else if (start > end) {
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u32 t = start;
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start = end;
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end = t;
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}
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u64 mask = (1 << (end - start + 1)) - 1;
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return (m_Bits >> start) & static_cast<IntType>(mask);
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}
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private:
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const IntType& m_Bits;
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};
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namespace Tegra::Texture::ASTC {
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using IntegerEncodedVector = boost::container::static_vector<
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IntegerEncodedValue, 256,
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boost::container::static_vector_options<
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boost::container::inplace_alignment<alignof(IntegerEncodedValue)>,
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boost::container::throw_on_overflow<false>>::type>;
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static void DecodeTritBlock(InputBitStream& bits, IntegerEncodedVector& result, u32 nBitsPerValue) {
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// Implement the algorithm in section C.2.12
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std::array<u32, 5> m;
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std::array<u32, 5> t;
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u32 T;
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// Read the trit encoded block according to
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// table C.2.14
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m[0] = bits.ReadBits(nBitsPerValue);
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T = bits.ReadBits<2>();
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m[1] = bits.ReadBits(nBitsPerValue);
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T |= bits.ReadBits<2>() << 2;
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m[2] = bits.ReadBits(nBitsPerValue);
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T |= bits.ReadBit() << 4;
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m[3] = bits.ReadBits(nBitsPerValue);
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T |= bits.ReadBits<2>() << 5;
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m[4] = bits.ReadBits(nBitsPerValue);
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T |= bits.ReadBit() << 7;
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u32 C = 0;
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Bits<u32> Tb(T);
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if (Tb(2, 4) == 7) {
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C = (Tb(5, 7) << 2) | Tb(0, 1);
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t[4] = t[3] = 2;
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} else {
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C = Tb(0, 4);
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if (Tb(5, 6) == 3) {
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t[4] = 2;
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t[3] = Tb[7];
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} else {
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t[4] = Tb[7];
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t[3] = Tb(5, 6);
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}
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}
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Bits<u32> Cb(C);
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if (Cb(0, 1) == 3) {
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t[2] = 2;
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t[1] = Cb[4];
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t[0] = (Cb[3] << 1) | (Cb[2] & ~Cb[3]);
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} else if (Cb(2, 3) == 3) {
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t[2] = 2;
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t[1] = 2;
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t[0] = Cb(0, 1);
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} else {
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t[2] = Cb[4];
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t[1] = Cb(2, 3);
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t[0] = (Cb[1] << 1) | (Cb[0] & ~Cb[1]);
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}
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for (std::size_t i = 0; i < 5; ++i) {
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IntegerEncodedValue& val = result.emplace_back(IntegerEncoding::Trit, nBitsPerValue);
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val.bit_value = m[i];
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val.trit_value = t[i];
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}
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}
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static void DecodeQuintBlock(InputBitStream& bits, IntegerEncodedVector& result,
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u32 nBitsPerValue) {
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// Implement the algorithm in section C.2.12
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u32 m[3];
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u32 q[3];
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u32 Q;
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// Read the trit encoded block according to
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// table C.2.15
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m[0] = bits.ReadBits(nBitsPerValue);
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Q = bits.ReadBits<3>();
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m[1] = bits.ReadBits(nBitsPerValue);
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Q |= bits.ReadBits<2>() << 3;
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m[2] = bits.ReadBits(nBitsPerValue);
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Q |= bits.ReadBits<2>() << 5;
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Bits<u32> Qb(Q);
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if (Qb(1, 2) == 3 && Qb(5, 6) == 0) {
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q[0] = q[1] = 4;
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q[2] = (Qb[0] << 2) | ((Qb[4] & ~Qb[0]) << 1) | (Qb[3] & ~Qb[0]);
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} else {
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u32 C = 0;
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if (Qb(1, 2) == 3) {
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q[2] = 4;
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C = (Qb(3, 4) << 3) | ((~Qb(5, 6) & 3) << 1) | Qb[0];
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} else {
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q[2] = Qb(5, 6);
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C = Qb(0, 4);
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}
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Bits<u32> Cb(C);
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if (Cb(0, 2) == 5) {
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q[1] = 4;
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q[0] = Cb(3, 4);
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} else {
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q[1] = Cb(3, 4);
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q[0] = Cb(0, 2);
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}
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}
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for (std::size_t i = 0; i < 3; ++i) {
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IntegerEncodedValue& val = result.emplace_back(IntegerEncoding::Quint, nBitsPerValue);
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val.bit_value = m[i];
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val.quint_value = q[i];
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}
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}
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// Fills result with the values that are encoded in the given
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// bitstream. We must know beforehand what the maximum possible
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// value is, and how many values we're decoding.
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static void DecodeIntegerSequence(IntegerEncodedVector& result, InputBitStream& bits, u32 maxRange,
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u32 nValues) {
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// Determine encoding parameters
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IntegerEncodedValue val = ASTC_ENCODINGS_VALUES[maxRange];
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// Start decoding
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u32 nValsDecoded = 0;
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while (nValsDecoded < nValues) {
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switch (val.encoding) {
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case IntegerEncoding::Quint:
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DecodeQuintBlock(bits, result, val.num_bits);
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nValsDecoded += 3;
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break;
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case IntegerEncoding::Trit:
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DecodeTritBlock(bits, result, val.num_bits);
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nValsDecoded += 5;
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break;
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case IntegerEncoding::JustBits:
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val.bit_value = bits.ReadBits(val.num_bits);
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result.push_back(val);
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nValsDecoded++;
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break;
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}
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}
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}
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struct TexelWeightParams {
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u32 m_Width = 0;
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u32 m_Height = 0;
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bool m_bDualPlane = false;
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u32 m_MaxWeight = 0;
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bool m_bError = false;
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bool m_bVoidExtentLDR = false;
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bool m_bVoidExtentHDR = false;
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u32 GetPackedBitSize() const {
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// How many indices do we have?
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u32 nIdxs = m_Height * m_Width;
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if (m_bDualPlane) {
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nIdxs *= 2;
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}
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return ASTC_ENCODINGS_VALUES[m_MaxWeight].GetBitLength(nIdxs);
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}
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u32 GetNumWeightValues() const {
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u32 ret = m_Width * m_Height;
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if (m_bDualPlane) {
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ret *= 2;
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}
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return ret;
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}
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};
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static TexelWeightParams DecodeBlockInfo(InputBitStream& strm) {
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TexelWeightParams params;
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// Read the entire block mode all at once
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u16 modeBits = static_cast<u16>(strm.ReadBits<11>());
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// Does this match the void extent block mode?
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if ((modeBits & 0x01FF) == 0x1FC) {
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if (modeBits & 0x200) {
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params.m_bVoidExtentHDR = true;
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} else {
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params.m_bVoidExtentLDR = true;
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}
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// Next two bits must be one.
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if (!(modeBits & 0x400) || !strm.ReadBit()) {
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params.m_bError = true;
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}
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return params;
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}
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// First check if the last four bits are zero
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if ((modeBits & 0xF) == 0) {
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params.m_bError = true;
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return params;
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}
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// If the last two bits are zero, then if bits
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// [6-8] are all ones, this is also reserved.
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if ((modeBits & 0x3) == 0 && (modeBits & 0x1C0) == 0x1C0) {
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params.m_bError = true;
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return params;
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}
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// Otherwise, there is no error... Figure out the layout
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// of the block mode. Layout is determined by a number
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// between 0 and 9 corresponding to table C.2.8 of the
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// ASTC spec.
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u32 layout = 0;
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if ((modeBits & 0x1) || (modeBits & 0x2)) {
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// layout is in [0-4]
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if (modeBits & 0x8) {
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// layout is in [2-4]
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if (modeBits & 0x4) {
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// layout is in [3-4]
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if (modeBits & 0x100) {
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layout = 4;
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} else {
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layout = 3;
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}
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} else {
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layout = 2;
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}
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} else {
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// layout is in [0-1]
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if (modeBits & 0x4) {
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layout = 1;
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} else {
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layout = 0;
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}
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}
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} else {
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// layout is in [5-9]
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if (modeBits & 0x100) {
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// layout is in [7-9]
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if (modeBits & 0x80) {
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// layout is in [7-8]
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assert((modeBits & 0x40) == 0U);
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if (modeBits & 0x20) {
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layout = 8;
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} else {
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layout = 7;
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}
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} else {
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layout = 9;
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}
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} else {
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// layout is in [5-6]
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if (modeBits & 0x80) {
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layout = 6;
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} else {
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layout = 5;
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}
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}
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}
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assert(layout < 10);
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// Determine R
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u32 R = !!(modeBits & 0x10);
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if (layout < 5) {
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R |= (modeBits & 0x3) << 1;
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} else {
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R |= (modeBits & 0xC) >> 1;
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}
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assert(2 <= R && R <= 7);
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// Determine width & height
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switch (layout) {
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case 0: {
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u32 A = (modeBits >> 5) & 0x3;
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u32 B = (modeBits >> 7) & 0x3;
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params.m_Width = B + 4;
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params.m_Height = A + 2;
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break;
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}
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case 1: {
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u32 A = (modeBits >> 5) & 0x3;
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u32 B = (modeBits >> 7) & 0x3;
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params.m_Width = B + 8;
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params.m_Height = A + 2;
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break;
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}
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case 2: {
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u32 A = (modeBits >> 5) & 0x3;
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u32 B = (modeBits >> 7) & 0x3;
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params.m_Width = A + 2;
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params.m_Height = B + 8;
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break;
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}
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case 3: {
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u32 A = (modeBits >> 5) & 0x3;
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u32 B = (modeBits >> 7) & 0x1;
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params.m_Width = A + 2;
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params.m_Height = B + 6;
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break;
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}
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case 4: {
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u32 A = (modeBits >> 5) & 0x3;
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u32 B = (modeBits >> 7) & 0x1;
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params.m_Width = B + 2;
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params.m_Height = A + 2;
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break;
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}
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case 5: {
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u32 A = (modeBits >> 5) & 0x3;
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params.m_Width = 12;
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params.m_Height = A + 2;
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break;
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}
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case 6: {
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u32 A = (modeBits >> 5) & 0x3;
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params.m_Width = A + 2;
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params.m_Height = 12;
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break;
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}
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case 7: {
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params.m_Width = 6;
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params.m_Height = 10;
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break;
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}
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case 8: {
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params.m_Width = 10;
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params.m_Height = 6;
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break;
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}
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case 9: {
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u32 A = (modeBits >> 5) & 0x3;
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u32 B = (modeBits >> 9) & 0x3;
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params.m_Width = A + 6;
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params.m_Height = B + 6;
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break;
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}
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default:
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assert(false && "Don't know this layout...");
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params.m_bError = true;
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break;
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}
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// Determine whether or not we're using dual planes
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// and/or high precision layouts.
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bool D = (layout != 9) && (modeBits & 0x400);
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bool H = (layout != 9) && (modeBits & 0x200);
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if (H) {
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const u32 maxWeights[6] = {9, 11, 15, 19, 23, 31};
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params.m_MaxWeight = maxWeights[R - 2];
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} else {
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const u32 maxWeights[6] = {1, 2, 3, 4, 5, 7};
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params.m_MaxWeight = maxWeights[R - 2];
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}
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params.m_bDualPlane = D;
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return params;
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}
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static void FillVoidExtentLDR(InputBitStream& strm, std::span<u32> outBuf, u32 blockWidth,
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u32 blockHeight) {
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// Don't actually care about the void extent, just read the bits...
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for (s32 i = 0; i < 4; ++i) {
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strm.ReadBits<13>();
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}
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// Decode the RGBA components and renormalize them to the range [0, 255]
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u16 r = static_cast<u16>(strm.ReadBits<16>());
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u16 g = static_cast<u16>(strm.ReadBits<16>());
|
|
u16 b = static_cast<u16>(strm.ReadBits<16>());
|
|
u16 a = static_cast<u16>(strm.ReadBits<16>());
|
|
|
|
u32 rgba = (r >> 8) | (g & 0xFF00) | (static_cast<u32>(b) & 0xFF00) << 8 |
|
|
(static_cast<u32>(a) & 0xFF00) << 16;
|
|
|
|
for (u32 j = 0; j < blockHeight; j++) {
|
|
for (u32 i = 0; i < blockWidth; i++) {
|
|
outBuf[j * blockWidth + i] = rgba;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void FillError(std::span<u32> outBuf, u32 blockWidth, u32 blockHeight) {
|
|
for (u32 j = 0; j < blockHeight; j++) {
|
|
for (u32 i = 0; i < blockWidth; i++) {
|
|
outBuf[j * blockWidth + i] = 0xFFFF00FF;
|
|
}
|
|
}
|
|
}
|
|
|
|
static constexpr auto REPLICATE_BYTE_TO_16_TABLE = MakeReplicateTable<u32, 8, 16>();
|
|
static constexpr u32 ReplicateByteTo16(std::size_t value) {
|
|
return REPLICATE_BYTE_TO_16_TABLE[value];
|
|
}
|
|
|
|
static constexpr auto REPLICATE_BIT_TO_7_TABLE = MakeReplicateTable<u32, 1, 7>();
|
|
static constexpr u32 ReplicateBitTo7(std::size_t value) {
|
|
return REPLICATE_BIT_TO_7_TABLE[value];
|
|
}
|
|
|
|
static constexpr auto REPLICATE_BIT_TO_9_TABLE = MakeReplicateTable<u32, 1, 9>();
|
|
static constexpr u32 ReplicateBitTo9(std::size_t value) {
|
|
return REPLICATE_BIT_TO_9_TABLE[value];
|
|
}
|
|
|
|
static constexpr auto REPLICATE_1_BIT_TO_8_TABLE = MakeReplicateTable<u32, 1, 8>();
|
|
static constexpr auto REPLICATE_2_BIT_TO_8_TABLE = MakeReplicateTable<u32, 2, 8>();
|
|
static constexpr auto REPLICATE_3_BIT_TO_8_TABLE = MakeReplicateTable<u32, 3, 8>();
|
|
static constexpr auto REPLICATE_4_BIT_TO_8_TABLE = MakeReplicateTable<u32, 4, 8>();
|
|
static constexpr auto REPLICATE_5_BIT_TO_8_TABLE = MakeReplicateTable<u32, 5, 8>();
|
|
/// Use a precompiled table with the most common usages, if it's not in the expected range, fallback
|
|
/// to the runtime implementation
|
|
static constexpr u32 FastReplicateTo8(u32 value, u32 num_bits) {
|
|
switch (num_bits) {
|
|
case 1:
|
|
return REPLICATE_1_BIT_TO_8_TABLE[value];
|
|
case 2:
|
|
return REPLICATE_2_BIT_TO_8_TABLE[value];
|
|
case 3:
|
|
return REPLICATE_3_BIT_TO_8_TABLE[value];
|
|
case 4:
|
|
return REPLICATE_4_BIT_TO_8_TABLE[value];
|
|
case 5:
|
|
return REPLICATE_5_BIT_TO_8_TABLE[value];
|
|
case 6:
|
|
return REPLICATE_6_BIT_TO_8_TABLE[value];
|
|
case 7:
|
|
return REPLICATE_7_BIT_TO_8_TABLE[value];
|
|
case 8:
|
|
return REPLICATE_8_BIT_TO_8_TABLE[value];
|
|
default:
|
|
return Replicate(value, num_bits, 8);
|
|
}
|
|
}
|
|
|
|
static constexpr auto REPLICATE_1_BIT_TO_6_TABLE = MakeReplicateTable<u32, 1, 6>();
|
|
static constexpr auto REPLICATE_2_BIT_TO_6_TABLE = MakeReplicateTable<u32, 2, 6>();
|
|
static constexpr auto REPLICATE_3_BIT_TO_6_TABLE = MakeReplicateTable<u32, 3, 6>();
|
|
static constexpr auto REPLICATE_4_BIT_TO_6_TABLE = MakeReplicateTable<u32, 4, 6>();
|
|
static constexpr auto REPLICATE_5_BIT_TO_6_TABLE = MakeReplicateTable<u32, 5, 6>();
|
|
static constexpr u32 FastReplicateTo6(u32 value, u32 num_bits) {
|
|
switch (num_bits) {
|
|
case 1:
|
|
return REPLICATE_1_BIT_TO_6_TABLE[value];
|
|
case 2:
|
|
return REPLICATE_2_BIT_TO_6_TABLE[value];
|
|
case 3:
|
|
return REPLICATE_3_BIT_TO_6_TABLE[value];
|
|
case 4:
|
|
return REPLICATE_4_BIT_TO_6_TABLE[value];
|
|
case 5:
|
|
return REPLICATE_5_BIT_TO_6_TABLE[value];
|
|
default:
|
|
return Replicate(value, num_bits, 6);
|
|
}
|
|
}
|
|
|
|
class Pixel {
|
|
protected:
|
|
using ChannelType = s16;
|
|
u8 m_BitDepth[4] = {8, 8, 8, 8};
|
|
s16 color[4] = {};
|
|
|
|
public:
|
|
Pixel() = default;
|
|
Pixel(u32 a, u32 r, u32 g, u32 b, u32 bitDepth = 8)
|
|
: m_BitDepth{u8(bitDepth), u8(bitDepth), u8(bitDepth), u8(bitDepth)},
|
|
color{static_cast<ChannelType>(a), static_cast<ChannelType>(r),
|
|
static_cast<ChannelType>(g), static_cast<ChannelType>(b)} {}
|
|
|
|
// Changes the depth of each pixel. This scales the values to
|
|
// the appropriate bit depth by either truncating the least
|
|
// significant bits when going from larger to smaller bit depth
|
|
// or by repeating the most significant bits when going from
|
|
// smaller to larger bit depths.
|
|
void ChangeBitDepth() {
|
|
for (u32 i = 0; i < 4; i++) {
|
|
Component(i) = ChangeBitDepth(Component(i), m_BitDepth[i]);
|
|
m_BitDepth[i] = 8;
|
|
}
|
|
}
|
|
|
|
template <typename IntType>
|
|
static float ConvertChannelToFloat(IntType channel, u8 bitDepth) {
|
|
float denominator = static_cast<float>((1 << bitDepth) - 1);
|
|
return static_cast<float>(channel) / denominator;
|
|
}
|
|
|
|
// Changes the bit depth of a single component. See the comment
|
|
// above for how we do this.
|
|
static ChannelType ChangeBitDepth(Pixel::ChannelType val, u8 oldDepth) {
|
|
assert(oldDepth <= 8);
|
|
|
|
if (oldDepth == 8) {
|
|
// Do nothing
|
|
return val;
|
|
} else if (oldDepth == 0) {
|
|
return static_cast<ChannelType>((1 << 8) - 1);
|
|
} else if (8 > oldDepth) {
|
|
return static_cast<ChannelType>(FastReplicateTo8(static_cast<u32>(val), oldDepth));
|
|
} else {
|
|
// oldDepth > newDepth
|
|
const u8 bitsWasted = static_cast<u8>(oldDepth - 8);
|
|
u16 v = static_cast<u16>(val);
|
|
v = static_cast<u16>((v + (1 << (bitsWasted - 1))) >> bitsWasted);
|
|
v = ::std::min<u16>(::std::max<u16>(0, v), static_cast<u16>((1 << 8) - 1));
|
|
return static_cast<u8>(v);
|
|
}
|
|
|
|
assert(false && "We shouldn't get here.");
|
|
return 0;
|
|
}
|
|
|
|
const ChannelType& A() const {
|
|
return color[0];
|
|
}
|
|
ChannelType& A() {
|
|
return color[0];
|
|
}
|
|
const ChannelType& R() const {
|
|
return color[1];
|
|
}
|
|
ChannelType& R() {
|
|
return color[1];
|
|
}
|
|
const ChannelType& G() const {
|
|
return color[2];
|
|
}
|
|
ChannelType& G() {
|
|
return color[2];
|
|
}
|
|
const ChannelType& B() const {
|
|
return color[3];
|
|
}
|
|
ChannelType& B() {
|
|
return color[3];
|
|
}
|
|
const ChannelType& Component(u32 idx) const {
|
|
return color[idx];
|
|
}
|
|
ChannelType& Component(u32 idx) {
|
|
return color[idx];
|
|
}
|
|
|
|
void GetBitDepth(u8 (&outDepth)[4]) const {
|
|
for (s32 i = 0; i < 4; i++) {
|
|
outDepth[i] = m_BitDepth[i];
|
|
}
|
|
}
|
|
|
|
// Take all of the components, transform them to their 8-bit variants,
|
|
// and then pack each channel into an R8G8B8A8 32-bit integer. We assume
|
|
// that the architecture is little-endian, so the alpha channel will end
|
|
// up in the most-significant byte.
|
|
u32 Pack() const {
|
|
Pixel eightBit(*this);
|
|
eightBit.ChangeBitDepth();
|
|
|
|
u32 r = 0;
|
|
r |= eightBit.A();
|
|
r <<= 8;
|
|
r |= eightBit.B();
|
|
r <<= 8;
|
|
r |= eightBit.G();
|
|
r <<= 8;
|
|
r |= eightBit.R();
|
|
return r;
|
|
}
|
|
|
|
// Clamps the pixel to the range [0,255]
|
|
void ClampByte() {
|
|
for (u32 i = 0; i < 4; i++) {
|
|
color[i] = (color[i] < 0) ? 0 : ((color[i] > 255) ? 255 : color[i]);
|
|
}
|
|
}
|
|
|
|
void MakeOpaque() {
|
|
A() = 255;
|
|
}
|
|
};
|
|
|
|
static void DecodeColorValues(u32* out, std::span<u8> data, const u32* modes, const u32 nPartitions,
|
|
const u32 nBitsForColorData) {
|
|
// First figure out how many color values we have
|
|
u32 nValues = 0;
|
|
for (u32 i = 0; i < nPartitions; i++) {
|
|
nValues += ((modes[i] >> 2) + 1) << 1;
|
|
}
|
|
|
|
// Then based on the number of values and the remaining number of bits,
|
|
// figure out the max value for each of them...
|
|
u32 range = 256;
|
|
while (--range > 0) {
|
|
IntegerEncodedValue val = ASTC_ENCODINGS_VALUES[range];
|
|
u32 bitLength = val.GetBitLength(nValues);
|
|
if (bitLength <= nBitsForColorData) {
|
|
// Find the smallest possible range that matches the given encoding
|
|
while (--range > 0) {
|
|
IntegerEncodedValue newval = ASTC_ENCODINGS_VALUES[range];
|
|
if (!newval.MatchesEncoding(val)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Return to last matching range.
|
|
range++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// We now have enough to decode our integer sequence.
|
|
IntegerEncodedVector decodedColorValues;
|
|
|
|
InputBitStream colorStream(data, 0);
|
|
DecodeIntegerSequence(decodedColorValues, colorStream, range, nValues);
|
|
|
|
// Once we have the decoded values, we need to dequantize them to the 0-255 range
|
|
// This procedure is outlined in ASTC spec C.2.13
|
|
u32 outIdx = 0;
|
|
for (auto itr = decodedColorValues.begin(); itr != decodedColorValues.end(); ++itr) {
|
|
// Have we already decoded all that we need?
|
|
if (outIdx >= nValues) {
|
|
break;
|
|
}
|
|
|
|
const IntegerEncodedValue& val = *itr;
|
|
u32 bitlen = val.num_bits;
|
|
u32 bitval = val.bit_value;
|
|
|
|
assert(bitlen >= 1);
|
|
|
|
u32 A = 0, B = 0, C = 0, D = 0;
|
|
// A is just the lsb replicated 9 times.
|
|
A = ReplicateBitTo9(bitval & 1);
|
|
|
|
switch (val.encoding) {
|
|
// Replicate bits
|
|
case IntegerEncoding::JustBits:
|
|
out[outIdx++] = FastReplicateTo8(bitval, bitlen);
|
|
break;
|
|
|
|
// Use algorithm in C.2.13
|
|
case IntegerEncoding::Trit: {
|
|
|
|
D = val.trit_value;
|
|
|
|
switch (bitlen) {
|
|
case 1: {
|
|
C = 204;
|
|
} break;
|
|
|
|
case 2: {
|
|
C = 93;
|
|
// B = b000b0bb0
|
|
u32 b = (bitval >> 1) & 1;
|
|
B = (b << 8) | (b << 4) | (b << 2) | (b << 1);
|
|
} break;
|
|
|
|
case 3: {
|
|
C = 44;
|
|
// B = cb000cbcb
|
|
u32 cb = (bitval >> 1) & 3;
|
|
B = (cb << 7) | (cb << 2) | cb;
|
|
} break;
|
|
|
|
case 4: {
|
|
C = 22;
|
|
// B = dcb000dcb
|
|
u32 dcb = (bitval >> 1) & 7;
|
|
B = (dcb << 6) | dcb;
|
|
} break;
|
|
|
|
case 5: {
|
|
C = 11;
|
|
// B = edcb000ed
|
|
u32 edcb = (bitval >> 1) & 0xF;
|
|
B = (edcb << 5) | (edcb >> 2);
|
|
} break;
|
|
|
|
case 6: {
|
|
C = 5;
|
|
// B = fedcb000f
|
|
u32 fedcb = (bitval >> 1) & 0x1F;
|
|
B = (fedcb << 4) | (fedcb >> 4);
|
|
} break;
|
|
|
|
default:
|
|
assert(false && "Unsupported trit encoding for color values!");
|
|
break;
|
|
} // switch(bitlen)
|
|
} // case IntegerEncoding::Trit
|
|
break;
|
|
|
|
case IntegerEncoding::Quint: {
|
|
|
|
D = val.quint_value;
|
|
|
|
switch (bitlen) {
|
|
case 1: {
|
|
C = 113;
|
|
} break;
|
|
|
|
case 2: {
|
|
C = 54;
|
|
// B = b0000bb00
|
|
u32 b = (bitval >> 1) & 1;
|
|
B = (b << 8) | (b << 3) | (b << 2);
|
|
} break;
|
|
|
|
case 3: {
|
|
C = 26;
|
|
// B = cb0000cbc
|
|
u32 cb = (bitval >> 1) & 3;
|
|
B = (cb << 7) | (cb << 1) | (cb >> 1);
|
|
} break;
|
|
|
|
case 4: {
|
|
C = 13;
|
|
// B = dcb0000dc
|
|
u32 dcb = (bitval >> 1) & 7;
|
|
B = (dcb << 6) | (dcb >> 1);
|
|
} break;
|
|
|
|
case 5: {
|
|
C = 6;
|
|
// B = edcb0000e
|
|
u32 edcb = (bitval >> 1) & 0xF;
|
|
B = (edcb << 5) | (edcb >> 3);
|
|
} break;
|
|
|
|
default:
|
|
assert(false && "Unsupported quint encoding for color values!");
|
|
break;
|
|
} // switch(bitlen)
|
|
} // case IntegerEncoding::Quint
|
|
break;
|
|
} // switch(val.encoding)
|
|
|
|
if (val.encoding != IntegerEncoding::JustBits) {
|
|
u32 T = D * C + B;
|
|
T ^= A;
|
|
T = (A & 0x80) | (T >> 2);
|
|
out[outIdx++] = T;
|
|
}
|
|
}
|
|
|
|
// Make sure that each of our values is in the proper range...
|
|
for (u32 i = 0; i < nValues; i++) {
|
|
assert(out[i] <= 255);
|
|
}
|
|
}
|
|
|
|
static u32 UnquantizeTexelWeight(const IntegerEncodedValue& val) {
|
|
u32 bitval = val.bit_value;
|
|
u32 bitlen = val.num_bits;
|
|
|
|
u32 A = ReplicateBitTo7(bitval & 1);
|
|
u32 B = 0, C = 0, D = 0;
|
|
|
|
u32 result = 0;
|
|
switch (val.encoding) {
|
|
case IntegerEncoding::JustBits:
|
|
result = FastReplicateTo6(bitval, bitlen);
|
|
break;
|
|
|
|
case IntegerEncoding::Trit: {
|
|
D = val.trit_value;
|
|
assert(D < 3);
|
|
|
|
switch (bitlen) {
|
|
case 0: {
|
|
u32 results[3] = {0, 32, 63};
|
|
result = results[D];
|
|
} break;
|
|
|
|
case 1: {
|
|
C = 50;
|
|
} break;
|
|
|
|
case 2: {
|
|
C = 23;
|
|
u32 b = (bitval >> 1) & 1;
|
|
B = (b << 6) | (b << 2) | b;
|
|
} break;
|
|
|
|
case 3: {
|
|
C = 11;
|
|
u32 cb = (bitval >> 1) & 3;
|
|
B = (cb << 5) | cb;
|
|
} break;
|
|
|
|
default:
|
|
assert(false && "Invalid trit encoding for texel weight");
|
|
break;
|
|
}
|
|
} break;
|
|
|
|
case IntegerEncoding::Quint: {
|
|
D = val.quint_value;
|
|
assert(D < 5);
|
|
|
|
switch (bitlen) {
|
|
case 0: {
|
|
u32 results[5] = {0, 16, 32, 47, 63};
|
|
result = results[D];
|
|
} break;
|
|
|
|
case 1: {
|
|
C = 28;
|
|
} break;
|
|
|
|
case 2: {
|
|
C = 13;
|
|
u32 b = (bitval >> 1) & 1;
|
|
B = (b << 6) | (b << 1);
|
|
} break;
|
|
|
|
default:
|
|
assert(false && "Invalid quint encoding for texel weight");
|
|
break;
|
|
}
|
|
} break;
|
|
}
|
|
|
|
if (val.encoding != IntegerEncoding::JustBits && bitlen > 0) {
|
|
// Decode the value...
|
|
result = D * C + B;
|
|
result ^= A;
|
|
result = (A & 0x20) | (result >> 2);
|
|
}
|
|
|
|
assert(result < 64);
|
|
|
|
// Change from [0,63] to [0,64]
|
|
if (result > 32) {
|
|
result += 1;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void UnquantizeTexelWeights(u32 out[2][144], const IntegerEncodedVector& weights,
|
|
const TexelWeightParams& params, const u32 blockWidth,
|
|
const u32 blockHeight) {
|
|
u32 weightIdx = 0;
|
|
u32 unquantized[2][144];
|
|
|
|
for (auto itr = weights.begin(); itr != weights.end(); ++itr) {
|
|
unquantized[0][weightIdx] = UnquantizeTexelWeight(*itr);
|
|
|
|
if (params.m_bDualPlane) {
|
|
++itr;
|
|
unquantized[1][weightIdx] = UnquantizeTexelWeight(*itr);
|
|
if (itr == weights.end()) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (++weightIdx >= (params.m_Width * params.m_Height))
|
|
break;
|
|
}
|
|
|
|
// Do infill if necessary (Section C.2.18) ...
|
|
u32 Ds = (1024 + (blockWidth / 2)) / (blockWidth - 1);
|
|
u32 Dt = (1024 + (blockHeight / 2)) / (blockHeight - 1);
|
|
|
|
const u32 kPlaneScale = params.m_bDualPlane ? 2U : 1U;
|
|
for (u32 plane = 0; plane < kPlaneScale; plane++)
|
|
for (u32 t = 0; t < blockHeight; t++)
|
|
for (u32 s = 0; s < blockWidth; s++) {
|
|
u32 cs = Ds * s;
|
|
u32 ct = Dt * t;
|
|
|
|
u32 gs = (cs * (params.m_Width - 1) + 32) >> 6;
|
|
u32 gt = (ct * (params.m_Height - 1) + 32) >> 6;
|
|
|
|
u32 js = gs >> 4;
|
|
u32 fs = gs & 0xF;
|
|
|
|
u32 jt = gt >> 4;
|
|
u32 ft = gt & 0x0F;
|
|
|
|
u32 w11 = (fs * ft + 8) >> 4;
|
|
u32 w10 = ft - w11;
|
|
u32 w01 = fs - w11;
|
|
u32 w00 = 16 - fs - ft + w11;
|
|
|
|
u32 v0 = js + jt * params.m_Width;
|
|
|
|
#define FIND_TEXEL(tidx, bidx) \
|
|
u32 p##bidx = 0; \
|
|
do { \
|
|
if ((tidx) < (params.m_Width * params.m_Height)) { \
|
|
p##bidx = unquantized[plane][(tidx)]; \
|
|
} \
|
|
} while (0)
|
|
|
|
FIND_TEXEL(v0, 00);
|
|
FIND_TEXEL(v0 + 1, 01);
|
|
FIND_TEXEL(v0 + params.m_Width, 10);
|
|
FIND_TEXEL(v0 + params.m_Width + 1, 11);
|
|
|
|
#undef FIND_TEXEL
|
|
|
|
out[plane][t * blockWidth + s] =
|
|
(p00 * w00 + p01 * w01 + p10 * w10 + p11 * w11 + 8) >> 4;
|
|
}
|
|
}
|
|
|
|
// Transfers a bit as described in C.2.14
|
|
static inline void BitTransferSigned(int& a, int& b) {
|
|
b >>= 1;
|
|
b |= a & 0x80;
|
|
a >>= 1;
|
|
a &= 0x3F;
|
|
if (a & 0x20)
|
|
a -= 0x40;
|
|
}
|
|
|
|
// Adds more precision to the blue channel as described
|
|
// in C.2.14
|
|
static inline Pixel BlueContract(s32 a, s32 r, s32 g, s32 b) {
|
|
return Pixel(static_cast<s16>(a), static_cast<s16>((r + b) >> 1),
|
|
static_cast<s16>((g + b) >> 1), static_cast<s16>(b));
|
|
}
|
|
|
|
// Partition selection functions as specified in
|
|
// C.2.21
|
|
static inline u32 hash52(u32 p) {
|
|
p ^= p >> 15;
|
|
p -= p << 17;
|
|
p += p << 7;
|
|
p += p << 4;
|
|
p ^= p >> 5;
|
|
p += p << 16;
|
|
p ^= p >> 7;
|
|
p ^= p >> 3;
|
|
p ^= p << 6;
|
|
p ^= p >> 17;
|
|
return p;
|
|
}
|
|
|
|
static u32 SelectPartition(s32 seed, s32 x, s32 y, s32 z, s32 partitionCount, s32 smallBlock) {
|
|
if (1 == partitionCount)
|
|
return 0;
|
|
|
|
if (smallBlock) {
|
|
x <<= 1;
|
|
y <<= 1;
|
|
z <<= 1;
|
|
}
|
|
|
|
seed += (partitionCount - 1) * 1024;
|
|
|
|
u32 rnum = hash52(static_cast<u32>(seed));
|
|
u8 seed1 = static_cast<u8>(rnum & 0xF);
|
|
u8 seed2 = static_cast<u8>((rnum >> 4) & 0xF);
|
|
u8 seed3 = static_cast<u8>((rnum >> 8) & 0xF);
|
|
u8 seed4 = static_cast<u8>((rnum >> 12) & 0xF);
|
|
u8 seed5 = static_cast<u8>((rnum >> 16) & 0xF);
|
|
u8 seed6 = static_cast<u8>((rnum >> 20) & 0xF);
|
|
u8 seed7 = static_cast<u8>((rnum >> 24) & 0xF);
|
|
u8 seed8 = static_cast<u8>((rnum >> 28) & 0xF);
|
|
u8 seed9 = static_cast<u8>((rnum >> 18) & 0xF);
|
|
u8 seed10 = static_cast<u8>((rnum >> 22) & 0xF);
|
|
u8 seed11 = static_cast<u8>((rnum >> 26) & 0xF);
|
|
u8 seed12 = static_cast<u8>(((rnum >> 30) | (rnum << 2)) & 0xF);
|
|
|
|
seed1 = static_cast<u8>(seed1 * seed1);
|
|
seed2 = static_cast<u8>(seed2 * seed2);
|
|
seed3 = static_cast<u8>(seed3 * seed3);
|
|
seed4 = static_cast<u8>(seed4 * seed4);
|
|
seed5 = static_cast<u8>(seed5 * seed5);
|
|
seed6 = static_cast<u8>(seed6 * seed6);
|
|
seed7 = static_cast<u8>(seed7 * seed7);
|
|
seed8 = static_cast<u8>(seed8 * seed8);
|
|
seed9 = static_cast<u8>(seed9 * seed9);
|
|
seed10 = static_cast<u8>(seed10 * seed10);
|
|
seed11 = static_cast<u8>(seed11 * seed11);
|
|
seed12 = static_cast<u8>(seed12 * seed12);
|
|
|
|
s32 sh1, sh2, sh3;
|
|
if (seed & 1) {
|
|
sh1 = (seed & 2) ? 4 : 5;
|
|
sh2 = (partitionCount == 3) ? 6 : 5;
|
|
} else {
|
|
sh1 = (partitionCount == 3) ? 6 : 5;
|
|
sh2 = (seed & 2) ? 4 : 5;
|
|
}
|
|
sh3 = (seed & 0x10) ? sh1 : sh2;
|
|
|
|
seed1 = static_cast<u8>(seed1 >> sh1);
|
|
seed2 = static_cast<u8>(seed2 >> sh2);
|
|
seed3 = static_cast<u8>(seed3 >> sh1);
|
|
seed4 = static_cast<u8>(seed4 >> sh2);
|
|
seed5 = static_cast<u8>(seed5 >> sh1);
|
|
seed6 = static_cast<u8>(seed6 >> sh2);
|
|
seed7 = static_cast<u8>(seed7 >> sh1);
|
|
seed8 = static_cast<u8>(seed8 >> sh2);
|
|
seed9 = static_cast<u8>(seed9 >> sh3);
|
|
seed10 = static_cast<u8>(seed10 >> sh3);
|
|
seed11 = static_cast<u8>(seed11 >> sh3);
|
|
seed12 = static_cast<u8>(seed12 >> sh3);
|
|
|
|
s32 a = seed1 * x + seed2 * y + seed11 * z + (rnum >> 14);
|
|
s32 b = seed3 * x + seed4 * y + seed12 * z + (rnum >> 10);
|
|
s32 c = seed5 * x + seed6 * y + seed9 * z + (rnum >> 6);
|
|
s32 d = seed7 * x + seed8 * y + seed10 * z + (rnum >> 2);
|
|
|
|
a &= 0x3F;
|
|
b &= 0x3F;
|
|
c &= 0x3F;
|
|
d &= 0x3F;
|
|
|
|
if (partitionCount < 4)
|
|
d = 0;
|
|
if (partitionCount < 3)
|
|
c = 0;
|
|
|
|
if (a >= b && a >= c && a >= d)
|
|
return 0;
|
|
else if (b >= c && b >= d)
|
|
return 1;
|
|
else if (c >= d)
|
|
return 2;
|
|
return 3;
|
|
}
|
|
|
|
static inline u32 Select2DPartition(s32 seed, s32 x, s32 y, s32 partitionCount, s32 smallBlock) {
|
|
return SelectPartition(seed, x, y, 0, partitionCount, smallBlock);
|
|
}
|
|
|
|
// Section C.2.14
|
|
static void ComputeEndpoints(Pixel& ep1, Pixel& ep2, const u32*& colorValues,
|
|
u32 colorEndpointMode) {
|
|
#define READ_UINT_VALUES(N) \
|
|
u32 v[N]; \
|
|
for (u32 i = 0; i < N; i++) { \
|
|
v[i] = *(colorValues++); \
|
|
}
|
|
|
|
#define READ_INT_VALUES(N) \
|
|
s32 v[N]; \
|
|
for (u32 i = 0; i < N; i++) { \
|
|
v[i] = static_cast<int>(*(colorValues++)); \
|
|
}
|
|
|
|
switch (colorEndpointMode) {
|
|
case 0: {
|
|
READ_UINT_VALUES(2)
|
|
ep1 = Pixel(0xFF, v[0], v[0], v[0]);
|
|
ep2 = Pixel(0xFF, v[1], v[1], v[1]);
|
|
} break;
|
|
|
|
case 1: {
|
|
READ_UINT_VALUES(2)
|
|
u32 L0 = (v[0] >> 2) | (v[1] & 0xC0);
|
|
u32 L1 = std::min(L0 + (v[1] & 0x3F), 0xFFU);
|
|
ep1 = Pixel(0xFF, L0, L0, L0);
|
|
ep2 = Pixel(0xFF, L1, L1, L1);
|
|
} break;
|
|
|
|
case 4: {
|
|
READ_UINT_VALUES(4)
|
|
ep1 = Pixel(v[2], v[0], v[0], v[0]);
|
|
ep2 = Pixel(v[3], v[1], v[1], v[1]);
|
|
} break;
|
|
|
|
case 5: {
|
|
READ_INT_VALUES(4)
|
|
BitTransferSigned(v[1], v[0]);
|
|
BitTransferSigned(v[3], v[2]);
|
|
ep1 = Pixel(v[2], v[0], v[0], v[0]);
|
|
ep2 = Pixel(v[2] + v[3], v[0] + v[1], v[0] + v[1], v[0] + v[1]);
|
|
ep1.ClampByte();
|
|
ep2.ClampByte();
|
|
} break;
|
|
|
|
case 6: {
|
|
READ_UINT_VALUES(4)
|
|
ep1 = Pixel(0xFF, v[0] * v[3] >> 8, v[1] * v[3] >> 8, v[2] * v[3] >> 8);
|
|
ep2 = Pixel(0xFF, v[0], v[1], v[2]);
|
|
} break;
|
|
|
|
case 8: {
|
|
READ_UINT_VALUES(6)
|
|
if (v[1] + v[3] + v[5] >= v[0] + v[2] + v[4]) {
|
|
ep1 = Pixel(0xFF, v[0], v[2], v[4]);
|
|
ep2 = Pixel(0xFF, v[1], v[3], v[5]);
|
|
} else {
|
|
ep1 = BlueContract(0xFF, v[1], v[3], v[5]);
|
|
ep2 = BlueContract(0xFF, v[0], v[2], v[4]);
|
|
}
|
|
} break;
|
|
|
|
case 9: {
|
|
READ_INT_VALUES(6)
|
|
BitTransferSigned(v[1], v[0]);
|
|
BitTransferSigned(v[3], v[2]);
|
|
BitTransferSigned(v[5], v[4]);
|
|
if (v[1] + v[3] + v[5] >= 0) {
|
|
ep1 = Pixel(0xFF, v[0], v[2], v[4]);
|
|
ep2 = Pixel(0xFF, v[0] + v[1], v[2] + v[3], v[4] + v[5]);
|
|
} else {
|
|
ep1 = BlueContract(0xFF, v[0] + v[1], v[2] + v[3], v[4] + v[5]);
|
|
ep2 = BlueContract(0xFF, v[0], v[2], v[4]);
|
|
}
|
|
ep1.ClampByte();
|
|
ep2.ClampByte();
|
|
} break;
|
|
|
|
case 10: {
|
|
READ_UINT_VALUES(6)
|
|
ep1 = Pixel(v[4], v[0] * v[3] >> 8, v[1] * v[3] >> 8, v[2] * v[3] >> 8);
|
|
ep2 = Pixel(v[5], v[0], v[1], v[2]);
|
|
} break;
|
|
|
|
case 12: {
|
|
READ_UINT_VALUES(8)
|
|
if (v[1] + v[3] + v[5] >= v[0] + v[2] + v[4]) {
|
|
ep1 = Pixel(v[6], v[0], v[2], v[4]);
|
|
ep2 = Pixel(v[7], v[1], v[3], v[5]);
|
|
} else {
|
|
ep1 = BlueContract(v[7], v[1], v[3], v[5]);
|
|
ep2 = BlueContract(v[6], v[0], v[2], v[4]);
|
|
}
|
|
} break;
|
|
|
|
case 13: {
|
|
READ_INT_VALUES(8)
|
|
BitTransferSigned(v[1], v[0]);
|
|
BitTransferSigned(v[3], v[2]);
|
|
BitTransferSigned(v[5], v[4]);
|
|
BitTransferSigned(v[7], v[6]);
|
|
if (v[1] + v[3] + v[5] >= 0) {
|
|
ep1 = Pixel(v[6], v[0], v[2], v[4]);
|
|
ep2 = Pixel(v[7] + v[6], v[0] + v[1], v[2] + v[3], v[4] + v[5]);
|
|
} else {
|
|
ep1 = BlueContract(v[6] + v[7], v[0] + v[1], v[2] + v[3], v[4] + v[5]);
|
|
ep2 = BlueContract(v[6], v[0], v[2], v[4]);
|
|
}
|
|
ep1.ClampByte();
|
|
ep2.ClampByte();
|
|
} break;
|
|
|
|
default:
|
|
assert(false && "Unsupported color endpoint mode (is it HDR?)");
|
|
break;
|
|
}
|
|
|
|
#undef READ_UINT_VALUES
|
|
#undef READ_INT_VALUES
|
|
}
|
|
|
|
static void DecompressBlock(std::span<const u8, 16> inBuf, const u32 blockWidth,
|
|
const u32 blockHeight, std::span<u32, 12 * 12> outBuf) {
|
|
InputBitStream strm(inBuf);
|
|
TexelWeightParams weightParams = DecodeBlockInfo(strm);
|
|
|
|
// Was there an error?
|
|
if (weightParams.m_bError) {
|
|
assert(false && "Invalid block mode");
|
|
FillError(outBuf, blockWidth, blockHeight);
|
|
return;
|
|
}
|
|
|
|
if (weightParams.m_bVoidExtentLDR) {
|
|
FillVoidExtentLDR(strm, outBuf, blockWidth, blockHeight);
|
|
return;
|
|
}
|
|
|
|
if (weightParams.m_bVoidExtentHDR) {
|
|
assert(false && "HDR void extent blocks are unsupported!");
|
|
FillError(outBuf, blockWidth, blockHeight);
|
|
return;
|
|
}
|
|
|
|
if (weightParams.m_Width > blockWidth) {
|
|
assert(false && "Texel weight grid width should be smaller than block width");
|
|
FillError(outBuf, blockWidth, blockHeight);
|
|
return;
|
|
}
|
|
|
|
if (weightParams.m_Height > blockHeight) {
|
|
assert(false && "Texel weight grid height should be smaller than block height");
|
|
FillError(outBuf, blockWidth, blockHeight);
|
|
return;
|
|
}
|
|
|
|
// Read num partitions
|
|
u32 nPartitions = strm.ReadBits<2>() + 1;
|
|
assert(nPartitions <= 4);
|
|
|
|
if (nPartitions == 4 && weightParams.m_bDualPlane) {
|
|
assert(false && "Dual plane mode is incompatible with four partition blocks");
|
|
FillError(outBuf, blockWidth, blockHeight);
|
|
return;
|
|
}
|
|
|
|
// Based on the number of partitions, read the color endpoint mode for
|
|
// each partition.
|
|
|
|
// Determine partitions, partition index, and color endpoint modes
|
|
s32 planeIdx = -1;
|
|
u32 partitionIndex;
|
|
u32 colorEndpointMode[4] = {0, 0, 0, 0};
|
|
|
|
// Define color data.
|
|
u8 colorEndpointData[16];
|
|
memset(colorEndpointData, 0, sizeof(colorEndpointData));
|
|
OutputBitStream colorEndpointStream(colorEndpointData, 16 * 8, 0);
|
|
|
|
// Read extra config data...
|
|
u32 baseCEM = 0;
|
|
if (nPartitions == 1) {
|
|
colorEndpointMode[0] = strm.ReadBits<4>();
|
|
partitionIndex = 0;
|
|
} else {
|
|
partitionIndex = strm.ReadBits<10>();
|
|
baseCEM = strm.ReadBits<6>();
|
|
}
|
|
u32 baseMode = (baseCEM & 3);
|
|
|
|
// Remaining bits are color endpoint data...
|
|
u32 nWeightBits = weightParams.GetPackedBitSize();
|
|
s32 remainingBits = 128 - nWeightBits - static_cast<int>(strm.GetBitsRead());
|
|
|
|
// Consider extra bits prior to texel data...
|
|
u32 extraCEMbits = 0;
|
|
if (baseMode) {
|
|
switch (nPartitions) {
|
|
case 2:
|
|
extraCEMbits += 2;
|
|
break;
|
|
case 3:
|
|
extraCEMbits += 5;
|
|
break;
|
|
case 4:
|
|
extraCEMbits += 8;
|
|
break;
|
|
default:
|
|
assert(false);
|
|
break;
|
|
}
|
|
}
|
|
remainingBits -= extraCEMbits;
|
|
|
|
// Do we have a dual plane situation?
|
|
u32 planeSelectorBits = 0;
|
|
if (weightParams.m_bDualPlane) {
|
|
planeSelectorBits = 2;
|
|
}
|
|
remainingBits -= planeSelectorBits;
|
|
|
|
// Read color data...
|
|
u32 colorDataBits = remainingBits;
|
|
while (remainingBits > 0) {
|
|
u32 nb = std::min(remainingBits, 8);
|
|
u32 b = strm.ReadBits(nb);
|
|
colorEndpointStream.WriteBits(b, nb);
|
|
remainingBits -= 8;
|
|
}
|
|
|
|
// Read the plane selection bits
|
|
planeIdx = strm.ReadBits(planeSelectorBits);
|
|
|
|
// Read the rest of the CEM
|
|
if (baseMode) {
|
|
u32 extraCEM = strm.ReadBits(extraCEMbits);
|
|
u32 CEM = (extraCEM << 6) | baseCEM;
|
|
CEM >>= 2;
|
|
|
|
bool C[4] = {0};
|
|
for (u32 i = 0; i < nPartitions; i++) {
|
|
C[i] = CEM & 1;
|
|
CEM >>= 1;
|
|
}
|
|
|
|
u8 M[4] = {0};
|
|
for (u32 i = 0; i < nPartitions; i++) {
|
|
M[i] = CEM & 3;
|
|
CEM >>= 2;
|
|
assert(M[i] <= 3);
|
|
}
|
|
|
|
for (u32 i = 0; i < nPartitions; i++) {
|
|
colorEndpointMode[i] = baseMode;
|
|
if (!(C[i]))
|
|
colorEndpointMode[i] -= 1;
|
|
colorEndpointMode[i] <<= 2;
|
|
colorEndpointMode[i] |= M[i];
|
|
}
|
|
} else if (nPartitions > 1) {
|
|
u32 CEM = baseCEM >> 2;
|
|
for (u32 i = 0; i < nPartitions; i++) {
|
|
colorEndpointMode[i] = CEM;
|
|
}
|
|
}
|
|
|
|
// Make sure everything up till here is sane.
|
|
for (u32 i = 0; i < nPartitions; i++) {
|
|
assert(colorEndpointMode[i] < 16);
|
|
}
|
|
assert(strm.GetBitsRead() + weightParams.GetPackedBitSize() == 128);
|
|
|
|
// Decode both color data and texel weight data
|
|
u32 colorValues[32]; // Four values, two endpoints, four maximum paritions
|
|
DecodeColorValues(colorValues, colorEndpointData, colorEndpointMode, nPartitions,
|
|
colorDataBits);
|
|
|
|
Pixel endpoints[4][2];
|
|
const u32* colorValuesPtr = colorValues;
|
|
for (u32 i = 0; i < nPartitions; i++) {
|
|
ComputeEndpoints(endpoints[i][0], endpoints[i][1], colorValuesPtr, colorEndpointMode[i]);
|
|
}
|
|
|
|
// Read the texel weight data..
|
|
std::array<u8, 16> texelWeightData;
|
|
std::ranges::copy(inBuf, texelWeightData.begin());
|
|
|
|
// Reverse everything
|
|
for (u32 i = 0; i < 8; i++) {
|
|
// Taken from http://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith64Bits
|
|
#define REVERSE_BYTE(b) (((b)*0x80200802ULL) & 0x0884422110ULL) * 0x0101010101ULL >> 32
|
|
u8 a = static_cast<u8>(REVERSE_BYTE(texelWeightData[i]));
|
|
u8 b = static_cast<u8>(REVERSE_BYTE(texelWeightData[15 - i]));
|
|
#undef REVERSE_BYTE
|
|
|
|
texelWeightData[i] = b;
|
|
texelWeightData[15 - i] = a;
|
|
}
|
|
|
|
// Make sure that higher non-texel bits are set to zero
|
|
const u32 clearByteStart = (weightParams.GetPackedBitSize() >> 3) + 1;
|
|
if (clearByteStart > 0 && clearByteStart <= texelWeightData.size()) {
|
|
texelWeightData[clearByteStart - 1] &=
|
|
static_cast<u8>((1 << (weightParams.GetPackedBitSize() % 8)) - 1);
|
|
std::memset(texelWeightData.data() + clearByteStart, 0,
|
|
std::min(16U - clearByteStart, 16U));
|
|
}
|
|
|
|
IntegerEncodedVector texelWeightValues;
|
|
|
|
InputBitStream weightStream(texelWeightData);
|
|
|
|
DecodeIntegerSequence(texelWeightValues, weightStream, weightParams.m_MaxWeight,
|
|
weightParams.GetNumWeightValues());
|
|
|
|
// Blocks can be at most 12x12, so we can have as many as 144 weights
|
|
u32 weights[2][144];
|
|
UnquantizeTexelWeights(weights, texelWeightValues, weightParams, blockWidth, blockHeight);
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// Now that we have endpoints and weights, we can interpolate and generate
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// the proper decoding...
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for (u32 j = 0; j < blockHeight; j++)
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for (u32 i = 0; i < blockWidth; i++) {
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u32 partition = Select2DPartition(partitionIndex, i, j, nPartitions,
|
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(blockHeight * blockWidth) < 32);
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assert(partition < nPartitions);
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|
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Pixel p;
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for (u32 c = 0; c < 4; c++) {
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u32 C0 = endpoints[partition][0].Component(c);
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C0 = ReplicateByteTo16(C0);
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u32 C1 = endpoints[partition][1].Component(c);
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C1 = ReplicateByteTo16(C1);
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|
|
|
u32 plane = 0;
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if (weightParams.m_bDualPlane && (((planeIdx + 1) & 3) == c)) {
|
|
plane = 1;
|
|
}
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|
|
|
u32 weight = weights[plane][j * blockWidth + i];
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u32 C = (C0 * (64 - weight) + C1 * weight + 32) / 64;
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|
if (C == 65535) {
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p.Component(c) = 255;
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|
} else {
|
|
double Cf = static_cast<double>(C);
|
|
p.Component(c) = static_cast<u16>(255.0 * (Cf / 65536.0) + 0.5);
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|
}
|
|
}
|
|
|
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outBuf[j * blockWidth + i] = p.Pack();
|
|
}
|
|
}
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|
|
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void Decompress(std::span<const uint8_t> data, uint32_t width, uint32_t height, uint32_t depth,
|
|
uint32_t block_width, uint32_t block_height, std::span<uint8_t> output) {
|
|
u32 block_index = 0;
|
|
std::size_t depth_offset = 0;
|
|
for (u32 z = 0; z < depth; z++) {
|
|
for (u32 y = 0; y < height; y += block_height) {
|
|
for (u32 x = 0; x < width; x += block_width) {
|
|
const std::span<const u8, 16> blockPtr{data.subspan(block_index * 16, 16)};
|
|
|
|
// Blocks can be at most 12x12
|
|
std::array<u32, 12 * 12> uncompData;
|
|
DecompressBlock(blockPtr, block_width, block_height, uncompData);
|
|
|
|
u32 decompWidth = std::min(block_width, width - x);
|
|
u32 decompHeight = std::min(block_height, height - y);
|
|
|
|
const std::span<u8> outRow = output.subspan(depth_offset + (y * width + x) * 4);
|
|
for (u32 jj = 0; jj < decompHeight; jj++) {
|
|
std::memcpy(outRow.data() + jj * width * 4,
|
|
uncompData.data() + jj * block_width, decompWidth * 4);
|
|
}
|
|
++block_index;
|
|
}
|
|
}
|
|
depth_offset += height * width * 4;
|
|
}
|
|
}
|
|
|
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} // namespace Tegra::Texture::ASTC
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