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-rw-r--r--src/video_core/textures/astc.cpp1577
-rw-r--r--src/video_core/textures/astc.h3
-rw-r--r--src/video_core/textures/decoders.cpp8
3 files changed, 1588 insertions, 0 deletions
diff --git a/src/video_core/textures/astc.cpp b/src/video_core/textures/astc.cpp
new file mode 100644
index 000000000..9b2177ebd
--- /dev/null
+++ b/src/video_core/textures/astc.cpp
@@ -0,0 +1,1577 @@
+// Copyright 2016 The University of North Carolina at Chapel Hill
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Please send all BUG REPORTS to <pavel@cs.unc.edu>.
+// <http://gamma.cs.unc.edu/FasTC/>
+
+#include <algorithm>
+#include <cassert>
+#include <cstring>
+#include <span>
+#include <vector>
+
+#include <boost/container/static_vector.hpp>
+
+#include "common/common_types.h"
+#include "video_core/textures/astc.h"
+
+class InputBitStream {
+public:
+ constexpr explicit InputBitStream(std::span<const u8> data, size_t start_offset = 0)
+ : cur_byte{data.data()}, total_bits{data.size()}, next_bit{start_offset % 8} {}
+
+ constexpr size_t GetBitsRead() const {
+ return bits_read;
+ }
+
+ constexpr bool ReadBit() {
+ if (bits_read >= total_bits * 8) {
+ return 0;
+ }
+ const bool bit = ((*cur_byte >> next_bit) & 1) != 0;
+ ++next_bit;
+ while (next_bit >= 8) {
+ next_bit -= 8;
+ ++cur_byte;
+ }
+ ++bits_read;
+ return bit;
+ }
+
+ constexpr u32 ReadBits(std::size_t nBits) {
+ u32 ret = 0;
+ for (std::size_t i = 0; i < nBits; ++i) {
+ ret |= (ReadBit() & 1) << i;
+ }
+ return ret;
+ }
+
+ template <std::size_t nBits>
+ constexpr u32 ReadBits() {
+ u32 ret = 0;
+ for (std::size_t i = 0; i < nBits; ++i) {
+ ret |= (ReadBit() & 1) << i;
+ }
+ return ret;
+ }
+
+private:
+ const u8* cur_byte;
+ size_t total_bits = 0;
+ size_t next_bit = 0;
+ size_t bits_read = 0;
+};
+
+class OutputBitStream {
+public:
+ constexpr explicit OutputBitStream(u8* ptr, std::size_t bits = 0, std::size_t start_offset = 0)
+ : cur_byte{ptr}, num_bits{bits}, next_bit{start_offset % 8} {}
+
+ constexpr std::size_t GetBitsWritten() const {
+ return bits_written;
+ }
+
+ constexpr void WriteBitsR(u32 val, u32 nBits) {
+ for (u32 i = 0; i < nBits; i++) {
+ WriteBit((val >> (nBits - i - 1)) & 1);
+ }
+ }
+
+ constexpr void WriteBits(u32 val, u32 nBits) {
+ for (u32 i = 0; i < nBits; i++) {
+ WriteBit((val >> i) & 1);
+ }
+ }
+
+private:
+ constexpr void WriteBit(bool b) {
+ if (bits_written >= num_bits) {
+ return;
+ }
+
+ const u32 mask = 1 << next_bit++;
+
+ // clear the bit
+ *cur_byte &= static_cast<u8>(~mask);
+
+ // Write the bit, if necessary
+ if (b)
+ *cur_byte |= static_cast<u8>(mask);
+
+ // Next byte?
+ if (next_bit >= 8) {
+ cur_byte += 1;
+ next_bit = 0;
+ }
+ }
+
+ u8* cur_byte;
+ std::size_t num_bits;
+ std::size_t bits_written = 0;
+ std::size_t next_bit = 0;
+};
+
+template <typename IntType>
+class Bits {
+public:
+ explicit Bits(const IntType& v) : m_Bits(v) {}
+
+ Bits(const Bits&) = delete;
+ Bits& operator=(const Bits&) = delete;
+
+ u8 operator[](u32 bitPos) const {
+ return static_cast<u8>((m_Bits >> bitPos) & 1);
+ }
+
+ IntType operator()(u32 start, u32 end) const {
+ if (start == end) {
+ return (*this)[start];
+ } else if (start > end) {
+ u32 t = start;
+ start = end;
+ end = t;
+ }
+
+ u64 mask = (1 << (end - start + 1)) - 1;
+ return (m_Bits >> start) & static_cast<IntType>(mask);
+ }
+
+private:
+ const IntType& m_Bits;
+};
+
+namespace Tegra::Texture::ASTC {
+using IntegerEncodedVector = boost::container::static_vector<
+ IntegerEncodedValue, 256,
+ boost::container::static_vector_options<
+ boost::container::inplace_alignment<alignof(IntegerEncodedValue)>,
+ boost::container::throw_on_overflow<false>>::type>;
+
+static void DecodeTritBlock(InputBitStream& bits, IntegerEncodedVector& result, u32 nBitsPerValue) {
+ // Implement the algorithm in section C.2.12
+ std::array<u32, 5> m;
+ std::array<u32, 5> t;
+ u32 T;
+
+ // Read the trit encoded block according to
+ // table C.2.14
+ m[0] = bits.ReadBits(nBitsPerValue);
+ T = bits.ReadBits<2>();
+ m[1] = bits.ReadBits(nBitsPerValue);
+ T |= bits.ReadBits<2>() << 2;
+ m[2] = bits.ReadBits(nBitsPerValue);
+ T |= bits.ReadBit() << 4;
+ m[3] = bits.ReadBits(nBitsPerValue);
+ T |= bits.ReadBits<2>() << 5;
+ m[4] = bits.ReadBits(nBitsPerValue);
+ T |= bits.ReadBit() << 7;
+
+ u32 C = 0;
+
+ Bits<u32> Tb(T);
+ if (Tb(2, 4) == 7) {
+ C = (Tb(5, 7) << 2) | Tb(0, 1);
+ t[4] = t[3] = 2;
+ } else {
+ C = Tb(0, 4);
+ if (Tb(5, 6) == 3) {
+ t[4] = 2;
+ t[3] = Tb[7];
+ } else {
+ t[4] = Tb[7];
+ t[3] = Tb(5, 6);
+ }
+ }
+
+ Bits<u32> Cb(C);
+ if (Cb(0, 1) == 3) {
+ t[2] = 2;
+ t[1] = Cb[4];
+ t[0] = (Cb[3] << 1) | (Cb[2] & ~Cb[3]);
+ } else if (Cb(2, 3) == 3) {
+ t[2] = 2;
+ t[1] = 2;
+ t[0] = Cb(0, 1);
+ } else {
+ t[2] = Cb[4];
+ t[1] = Cb(2, 3);
+ t[0] = (Cb[1] << 1) | (Cb[0] & ~Cb[1]);
+ }
+
+ for (std::size_t i = 0; i < 5; ++i) {
+ IntegerEncodedValue& val = result.emplace_back(IntegerEncoding::Trit, nBitsPerValue);
+ val.bit_value = m[i];
+ val.trit_value = t[i];
+ }
+}
+
+static void DecodeQuintBlock(InputBitStream& bits, IntegerEncodedVector& result,
+ u32 nBitsPerValue) {
+ // Implement the algorithm in section C.2.12
+ u32 m[3];
+ u32 q[3];
+ u32 Q;
+
+ // Read the trit encoded block according to
+ // table C.2.15
+ m[0] = bits.ReadBits(nBitsPerValue);
+ Q = bits.ReadBits<3>();
+ m[1] = bits.ReadBits(nBitsPerValue);
+ Q |= bits.ReadBits<2>() << 3;
+ m[2] = bits.ReadBits(nBitsPerValue);
+ Q |= bits.ReadBits<2>() << 5;
+
+ Bits<u32> Qb(Q);
+ if (Qb(1, 2) == 3 && Qb(5, 6) == 0) {
+ q[0] = q[1] = 4;
+ q[2] = (Qb[0] << 2) | ((Qb[4] & ~Qb[0]) << 1) | (Qb[3] & ~Qb[0]);
+ } else {
+ u32 C = 0;
+ if (Qb(1, 2) == 3) {
+ q[2] = 4;
+ C = (Qb(3, 4) << 3) | ((~Qb(5, 6) & 3) << 1) | Qb[0];
+ } else {
+ q[2] = Qb(5, 6);
+ C = Qb(0, 4);
+ }
+
+ Bits<u32> Cb(C);
+ if (Cb(0, 2) == 5) {
+ q[1] = 4;
+ q[0] = Cb(3, 4);
+ } else {
+ q[1] = Cb(3, 4);
+ q[0] = Cb(0, 2);
+ }
+ }
+
+ for (std::size_t i = 0; i < 3; ++i) {
+ IntegerEncodedValue& val = result.emplace_back(IntegerEncoding::Quint, nBitsPerValue);
+ val.bit_value = m[i];
+ val.quint_value = q[i];
+ }
+}
+
+// Fills result with the values that are encoded in the given
+// bitstream. We must know beforehand what the maximum possible
+// value is, and how many values we're decoding.
+static void DecodeIntegerSequence(IntegerEncodedVector& result, InputBitStream& bits, u32 maxRange,
+ u32 nValues) {
+ // Determine encoding parameters
+ IntegerEncodedValue val = EncodingsValues[maxRange];
+
+ // Start decoding
+ u32 nValsDecoded = 0;
+ while (nValsDecoded < nValues) {
+ switch (val.encoding) {
+ case IntegerEncoding::Quint:
+ DecodeQuintBlock(bits, result, val.num_bits);
+ nValsDecoded += 3;
+ break;
+
+ case IntegerEncoding::Trit:
+ DecodeTritBlock(bits, result, val.num_bits);
+ nValsDecoded += 5;
+ break;
+
+ case IntegerEncoding::JustBits:
+ val.bit_value = bits.ReadBits(val.num_bits);
+ result.push_back(val);
+ nValsDecoded++;
+ break;
+ }
+ }
+}
+
+struct TexelWeightParams {
+ u32 m_Width = 0;
+ u32 m_Height = 0;
+ bool m_bDualPlane = false;
+ u32 m_MaxWeight = 0;
+ bool m_bError = false;
+ bool m_bVoidExtentLDR = false;
+ bool m_bVoidExtentHDR = false;
+
+ u32 GetPackedBitSize() const {
+ // How many indices do we have?
+ u32 nIdxs = m_Height * m_Width;
+ if (m_bDualPlane) {
+ nIdxs *= 2;
+ }
+
+ return EncodingsValues[m_MaxWeight].GetBitLength(nIdxs);
+ }
+
+ u32 GetNumWeightValues() const {
+ u32 ret = m_Width * m_Height;
+ if (m_bDualPlane) {
+ ret *= 2;
+ }
+ return ret;
+ }
+};
+
+static TexelWeightParams DecodeBlockInfo(InputBitStream& strm) {
+ TexelWeightParams params;
+
+ // Read the entire block mode all at once
+ u16 modeBits = static_cast<u16>(strm.ReadBits<11>());
+
+ // Does this match the void extent block mode?
+ if ((modeBits & 0x01FF) == 0x1FC) {
+ if (modeBits & 0x200) {
+ params.m_bVoidExtentHDR = true;
+ } else {
+ params.m_bVoidExtentLDR = true;
+ }
+
+ // Next two bits must be one.
+ if (!(modeBits & 0x400) || !strm.ReadBit()) {
+ params.m_bError = true;
+ }
+
+ return params;
+ }
+
+ // First check if the last four bits are zero
+ if ((modeBits & 0xF) == 0) {
+ params.m_bError = true;
+ return params;
+ }
+
+ // If the last two bits are zero, then if bits
+ // [6-8] are all ones, this is also reserved.
+ if ((modeBits & 0x3) == 0 && (modeBits & 0x1C0) == 0x1C0) {
+ params.m_bError = true;
+ return params;
+ }
+
+ // Otherwise, there is no error... Figure out the layout
+ // of the block mode. Layout is determined by a number
+ // between 0 and 9 corresponding to table C.2.8 of the
+ // ASTC spec.
+ u32 layout = 0;
+
+ if ((modeBits & 0x1) || (modeBits & 0x2)) {
+ // layout is in [0-4]
+ if (modeBits & 0x8) {
+ // layout is in [2-4]
+ if (modeBits & 0x4) {
+ // layout is in [3-4]
+ if (modeBits & 0x100) {
+ layout = 4;
+ } else {
+ layout = 3;
+ }
+ } else {
+ layout = 2;
+ }
+ } else {
+ // layout is in [0-1]
+ if (modeBits & 0x4) {
+ layout = 1;
+ } else {
+ layout = 0;
+ }
+ }
+ } else {
+ // layout is in [5-9]
+ if (modeBits & 0x100) {
+ // layout is in [7-9]
+ if (modeBits & 0x80) {
+ // layout is in [7-8]
+ assert((modeBits & 0x40) == 0U);
+ if (modeBits & 0x20) {
+ layout = 8;
+ } else {
+ layout = 7;
+ }
+ } else {
+ layout = 9;
+ }
+ } else {
+ // layout is in [5-6]
+ if (modeBits & 0x80) {
+ layout = 6;
+ } else {
+ layout = 5;
+ }
+ }
+ }
+
+ assert(layout < 10);
+
+ // Determine R
+ u32 R = !!(modeBits & 0x10);
+ if (layout < 5) {
+ R |= (modeBits & 0x3) << 1;
+ } else {
+ R |= (modeBits & 0xC) >> 1;
+ }
+ assert(2 <= R && R <= 7);
+
+ // Determine width & height
+ switch (layout) {
+ case 0: {
+ u32 A = (modeBits >> 5) & 0x3;
+ u32 B = (modeBits >> 7) & 0x3;
+ params.m_Width = B + 4;
+ params.m_Height = A + 2;
+ break;
+ }
+
+ case 1: {
+ u32 A = (modeBits >> 5) & 0x3;
+ u32 B = (modeBits >> 7) & 0x3;
+ params.m_Width = B + 8;
+ params.m_Height = A + 2;
+ break;
+ }
+
+ case 2: {
+ u32 A = (modeBits >> 5) & 0x3;
+ u32 B = (modeBits >> 7) & 0x3;
+ params.m_Width = A + 2;
+ params.m_Height = B + 8;
+ break;
+ }
+
+ case 3: {
+ u32 A = (modeBits >> 5) & 0x3;
+ u32 B = (modeBits >> 7) & 0x1;
+ params.m_Width = A + 2;
+ params.m_Height = B + 6;
+ break;
+ }
+
+ case 4: {
+ u32 A = (modeBits >> 5) & 0x3;
+ u32 B = (modeBits >> 7) & 0x1;
+ params.m_Width = B + 2;
+ params.m_Height = A + 2;
+ break;
+ }
+
+ case 5: {
+ u32 A = (modeBits >> 5) & 0x3;
+ params.m_Width = 12;
+ params.m_Height = A + 2;
+ break;
+ }
+
+ case 6: {
+ u32 A = (modeBits >> 5) & 0x3;
+ params.m_Width = A + 2;
+ params.m_Height = 12;
+ break;
+ }
+
+ case 7: {
+ params.m_Width = 6;
+ params.m_Height = 10;
+ break;
+ }
+
+ case 8: {
+ params.m_Width = 10;
+ params.m_Height = 6;
+ break;
+ }
+
+ case 9: {
+ u32 A = (modeBits >> 5) & 0x3;
+ u32 B = (modeBits >> 9) & 0x3;
+ params.m_Width = A + 6;
+ params.m_Height = B + 6;
+ break;
+ }
+
+ default:
+ assert(false && "Don't know this layout...");
+ params.m_bError = true;
+ break;
+ }
+
+ // Determine whether or not we're using dual planes
+ // and/or high precision layouts.
+ bool D = (layout != 9) && (modeBits & 0x400);
+ bool H = (layout != 9) && (modeBits & 0x200);
+
+ if (H) {
+ const u32 maxWeights[6] = {9, 11, 15, 19, 23, 31};
+ params.m_MaxWeight = maxWeights[R - 2];
+ } else {
+ const u32 maxWeights[6] = {1, 2, 3, 4, 5, 7};
+ params.m_MaxWeight = maxWeights[R - 2];
+ }
+
+ params.m_bDualPlane = D;
+
+ return params;
+}
+
+static void FillVoidExtentLDR(InputBitStream& strm, std::span<u32> outBuf, u32 blockWidth,
+ u32 blockHeight) {
+ // Don't actually care about the void extent, just read the bits...
+ for (s32 i = 0; i < 4; ++i) {
+ strm.ReadBits<13>();
+ }
+
+ // Decode the RGBA components and renormalize them to the range [0, 255]
+ u16 r = static_cast<u16>(strm.ReadBits<16>());
+ 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 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 = EncodingsValues[range];
+ u32 bitLength = val.GetBitLength(nValues);
+ if (bitLength <= nBitsForColorData) {
+ // Find the smallest possible range that matches the given encoding
+ while (--range > 0) {
+ IntegerEncodedValue newval = EncodingsValues[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);
+
+ // Now that we have endpoints and weights, we can interpolate and generate
+ // the proper decoding...
+ for (u32 j = 0; j < blockHeight; j++)
+ for (u32 i = 0; i < blockWidth; i++) {
+ u32 partition = Select2DPartition(partitionIndex, i, j, nPartitions,
+ (blockHeight * blockWidth) < 32);
+ assert(partition < nPartitions);
+
+ Pixel p;
+ for (u32 c = 0; c < 4; c++) {
+ u32 C0 = endpoints[partition][0].Component(c);
+ C0 = ReplicateByteTo16(C0);
+ u32 C1 = endpoints[partition][1].Component(c);
+ C1 = ReplicateByteTo16(C1);
+
+ u32 plane = 0;
+ if (weightParams.m_bDualPlane && (((planeIdx + 1) & 3) == c)) {
+ plane = 1;
+ }
+
+ u32 weight = weights[plane][j * blockWidth + i];
+ u32 C = (C0 * (64 - weight) + C1 * weight + 32) / 64;
+ if (C == 65535) {
+ p.Component(c) = 255;
+ } else {
+ double Cf = static_cast<double>(C);
+ p.Component(c) = static_cast<u16>(255.0 * (Cf / 65536.0) + 0.5);
+ }
+ }
+
+ outBuf[j * blockWidth + i] = p.Pack();
+ }
+}
+
+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;
+ }
+}
+
+} // namespace Tegra::Texture::ASTC
diff --git a/src/video_core/textures/astc.h b/src/video_core/textures/astc.h
index c1c73fda5..c1c37dfe7 100644
--- a/src/video_core/textures/astc.h
+++ b/src/video_core/textures/astc.h
@@ -129,4 +129,7 @@ struct AstcBufferData {
decltype(REPLICATE_BYTE_TO_16_TABLE) replicate_byte_to_16 = REPLICATE_BYTE_TO_16_TABLE;
} constexpr ASTC_BUFFER_DATA;
+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);
+
} // namespace Tegra::Texture::ASTC
diff --git a/src/video_core/textures/decoders.cpp b/src/video_core/textures/decoders.cpp
index 3a463d5db..f1f523ad1 100644
--- a/src/video_core/textures/decoders.cpp
+++ b/src/video_core/textures/decoders.cpp
@@ -63,6 +63,14 @@ void Swizzle(std::span<u8> output, std::span<const u8> input, u32 bytes_per_pixe
const u32 unswizzled_offset =
slice * pitch * height + line * pitch + column * bytes_per_pixel;
+ if (const auto offset = (TO_LINEAR ? unswizzled_offset : swizzled_offset);
+ offset >= input.size()) {
+ // TODO(Rodrigo): This is an out of bounds access that should never happen. To
+ // avoid crashing the emulator, break.
+ ASSERT_MSG(false, "offset {} exceeds input size {}!", offset, input.size());
+ break;
+ }
+
u8* const dst = &output[TO_LINEAR ? swizzled_offset : unswizzled_offset];
const u8* const src = &input[TO_LINEAR ? unswizzled_offset : swizzled_offset];
std::memcpy(dst, src, bytes_per_pixel);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 11:21:45 +0100