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-rw-r--r--Ryujinx.Graphics/Texture/ASTCDecoder.cs1384
1 files changed, 1384 insertions, 0 deletions
diff --git a/Ryujinx.Graphics/Texture/ASTCDecoder.cs b/Ryujinx.Graphics/Texture/ASTCDecoder.cs
new file mode 100644
index 00000000..1efa0255
--- /dev/null
+++ b/Ryujinx.Graphics/Texture/ASTCDecoder.cs
@@ -0,0 +1,1384 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+
+namespace Ryujinx.Graphics.Texture
+{
+ public class ASTCDecoderException : Exception
+ {
+ public ASTCDecoderException(string ExMsg) : base(ExMsg) { }
+ }
+
+ //https://github.com/GammaUNC/FasTC/blob/master/ASTCEncoder/src/Decompressor.cpp
+ public static class ASTCDecoder
+ {
+ struct TexelWeightParams
+ {
+ public int Width;
+ public int Height;
+ public bool DualPlane;
+ public int MaxWeight;
+ public bool Error;
+ public bool VoidExtentLDR;
+ public bool VoidExtentHDR;
+
+ public int GetPackedBitSize()
+ {
+ // How many indices do we have?
+ int Indices = Height * Width;
+
+ if (DualPlane)
+ {
+ Indices *= 2;
+ }
+
+ IntegerEncoded IntEncoded = IntegerEncoded.CreateEncoding(MaxWeight);
+
+ return IntEncoded.GetBitLength(Indices);
+ }
+
+ public int GetNumWeightValues()
+ {
+ int Ret = Width * Height;
+
+ if (DualPlane)
+ {
+ Ret *= 2;
+ }
+
+ return Ret;
+ }
+ }
+
+ public static byte[] DecodeToRGBA8888(
+ byte[] InputBuffer,
+ int BlockX,
+ int BlockY,
+ int BlockZ,
+ int X,
+ int Y,
+ int Z)
+ {
+ using (MemoryStream InputStream = new MemoryStream(InputBuffer))
+ {
+ BinaryReader BinReader = new BinaryReader(InputStream);
+
+ if (BlockX > 12 || BlockY > 12)
+ {
+ throw new ASTCDecoderException("Block size unsupported!");
+ }
+
+ if (BlockZ != 1 || Z != 1)
+ {
+ throw new ASTCDecoderException("3D compressed textures unsupported!");
+ }
+
+ using (MemoryStream OutputStream = new MemoryStream())
+ {
+ int BlockIndex = 0;
+
+ for (int j = 0; j < Y; j += BlockY)
+ {
+ for (int i = 0; i < X; i += BlockX)
+ {
+ int[] DecompressedData = new int[144];
+
+ DecompressBlock(BinReader.ReadBytes(0x10), DecompressedData, BlockX, BlockY);
+
+ int DecompressedWidth = Math.Min(BlockX, X - i);
+ int DecompressedHeight = Math.Min(BlockY, Y - j);
+ int BaseOffsets = (j * X + i) * 4;
+
+ for (int jj = 0; jj < DecompressedHeight; jj++)
+ {
+ OutputStream.Seek(BaseOffsets + jj * X * 4, SeekOrigin.Begin);
+
+ byte[] OutputBuffer = new byte[DecompressedData.Length * sizeof(int)];
+ Buffer.BlockCopy(DecompressedData, 0, OutputBuffer, 0, OutputBuffer.Length);
+
+ OutputStream.Write(OutputBuffer, jj * BlockX * 4, DecompressedWidth * 4);
+ }
+
+ BlockIndex++;
+ }
+ }
+
+ return OutputStream.ToArray();
+ }
+ }
+ }
+
+ public static bool DecompressBlock(
+ byte[] InputBuffer,
+ int[] OutputBuffer,
+ int BlockWidth,
+ int BlockHeight)
+ {
+ BitArrayStream BitStream = new BitArrayStream(new BitArray(InputBuffer));
+ TexelWeightParams TexelParams = DecodeBlockInfo(BitStream);
+
+ if (TexelParams.Error)
+ {
+ throw new ASTCDecoderException("Invalid block mode");
+ }
+
+ if (TexelParams.VoidExtentLDR)
+ {
+ FillVoidExtentLDR(BitStream, OutputBuffer, BlockWidth, BlockHeight);
+
+ return true;
+ }
+
+ if (TexelParams.VoidExtentHDR)
+ {
+ throw new ASTCDecoderException("HDR void extent blocks are unsupported!");
+ }
+
+ if (TexelParams.Width > BlockWidth)
+ {
+ throw new ASTCDecoderException("Texel weight grid width should be smaller than block width");
+ }
+
+ if (TexelParams.Height > BlockHeight)
+ {
+ throw new ASTCDecoderException("Texel weight grid height should be smaller than block height");
+ }
+
+ // Read num partitions
+ int NumberPartitions = BitStream.ReadBits(2) + 1;
+ Debug.Assert(NumberPartitions <= 4);
+
+ if (NumberPartitions == 4 && TexelParams.DualPlane)
+ {
+ throw new ASTCDecoderException("Dual plane mode is incompatible with four partition blocks");
+ }
+
+ // Based on the number of partitions, read the color endpoint mode for
+ // each partition.
+
+ // Determine partitions, partition index, and color endpoint modes
+ int PlaneIndices = -1;
+ int PartitionIndex;
+ uint[] ColorEndpointMode = { 0, 0, 0, 0 };
+
+ BitArrayStream ColorEndpointStream = new BitArrayStream(new BitArray(16 * 8));
+
+ // Read extra config data...
+ uint BaseColorEndpointMode = 0;
+
+ if (NumberPartitions == 1)
+ {
+ ColorEndpointMode[0] = (uint)BitStream.ReadBits(4);
+ PartitionIndex = 0;
+ }
+ else
+ {
+ PartitionIndex = BitStream.ReadBits(10);
+ BaseColorEndpointMode = (uint)BitStream.ReadBits(6);
+ }
+
+ uint BaseMode = (BaseColorEndpointMode & 3);
+
+ // Remaining bits are color endpoint data...
+ int NumberWeightBits = TexelParams.GetPackedBitSize();
+ int RemainingBits = 128 - NumberWeightBits - BitStream.Position;
+
+ // Consider extra bits prior to texel data...
+ uint ExtraColorEndpointModeBits = 0;
+
+ if (BaseMode != 0)
+ {
+ switch (NumberPartitions)
+ {
+ case 2: ExtraColorEndpointModeBits += 2; break;
+ case 3: ExtraColorEndpointModeBits += 5; break;
+ case 4: ExtraColorEndpointModeBits += 8; break;
+ default: Debug.Assert(false); break;
+ }
+ }
+
+ RemainingBits -= (int)ExtraColorEndpointModeBits;
+
+ // Do we have a dual plane situation?
+ int PlaneSelectorBits = 0;
+
+ if (TexelParams.DualPlane)
+ {
+ PlaneSelectorBits = 2;
+ }
+
+ RemainingBits -= PlaneSelectorBits;
+
+ // Read color data...
+ int ColorDataBits = RemainingBits;
+
+ while (RemainingBits > 0)
+ {
+ int NumberBits = Math.Min(RemainingBits, 8);
+ int Bits = BitStream.ReadBits(NumberBits);
+ ColorEndpointStream.WriteBits(Bits, NumberBits);
+ RemainingBits -= 8;
+ }
+
+ // Read the plane selection bits
+ PlaneIndices = BitStream.ReadBits(PlaneSelectorBits);
+
+ // Read the rest of the CEM
+ if (BaseMode != 0)
+ {
+ uint ExtraColorEndpointMode = (uint)BitStream.ReadBits((int)ExtraColorEndpointModeBits);
+ uint TempColorEndpointMode = (ExtraColorEndpointMode << 6) | BaseColorEndpointMode;
+ TempColorEndpointMode >>= 2;
+
+ bool[] C = new bool[4];
+
+ for (int i = 0; i < NumberPartitions; i++)
+ {
+ C[i] = (TempColorEndpointMode & 1) != 0;
+ TempColorEndpointMode >>= 1;
+ }
+
+ byte[] M = new byte[4];
+
+ for (int i = 0; i < NumberPartitions; i++)
+ {
+ M[i] = (byte)(TempColorEndpointMode & 3);
+ TempColorEndpointMode >>= 2;
+ Debug.Assert(M[i] <= 3);
+ }
+
+ for (int i = 0; i < NumberPartitions; i++)
+ {
+ ColorEndpointMode[i] = BaseMode;
+ if (!(C[i])) ColorEndpointMode[i] -= 1;
+ ColorEndpointMode[i] <<= 2;
+ ColorEndpointMode[i] |= M[i];
+ }
+ }
+ else if (NumberPartitions > 1)
+ {
+ uint TempColorEndpointMode = BaseColorEndpointMode >> 2;
+
+ for (uint i = 0; i < NumberPartitions; i++)
+ {
+ ColorEndpointMode[i] = TempColorEndpointMode;
+ }
+ }
+
+ // Make sure everything up till here is sane.
+ for (int i = 0; i < NumberPartitions; i++)
+ {
+ Debug.Assert(ColorEndpointMode[i] < 16);
+ }
+ Debug.Assert(BitStream.Position + TexelParams.GetPackedBitSize() == 128);
+
+ // Decode both color data and texel weight data
+ int[] ColorValues = new int[32]; // Four values * two endpoints * four maximum partitions
+ DecodeColorValues(ColorValues, ColorEndpointStream.ToByteArray(), ColorEndpointMode, NumberPartitions, ColorDataBits);
+
+ ASTCPixel[][] EndPoints = new ASTCPixel[4][];
+ EndPoints[0] = new ASTCPixel[2];
+ EndPoints[1] = new ASTCPixel[2];
+ EndPoints[2] = new ASTCPixel[2];
+ EndPoints[3] = new ASTCPixel[2];
+
+ int ColorValuesPosition = 0;
+
+ for (int i = 0; i < NumberPartitions; i++)
+ {
+ ComputeEndpoints(EndPoints[i], ColorValues, ColorEndpointMode[i], ref ColorValuesPosition);
+ }
+
+ // Read the texel weight data.
+ byte[] TexelWeightData = (byte[])InputBuffer.Clone();
+
+ // Reverse everything
+ for (int i = 0; i < 8; i++)
+ {
+ byte a = ReverseByte(TexelWeightData[i]);
+ byte b = ReverseByte(TexelWeightData[15 - i]);
+
+ TexelWeightData[i] = b;
+ TexelWeightData[15 - i] = a;
+ }
+
+ // Make sure that higher non-texel bits are set to zero
+ int ClearByteStart = (TexelParams.GetPackedBitSize() >> 3) + 1;
+ TexelWeightData[ClearByteStart - 1] &= (byte)((1 << (TexelParams.GetPackedBitSize() % 8)) - 1);
+
+ int cLen = 16 - ClearByteStart;
+ for (int i = ClearByteStart; i < ClearByteStart + cLen; i++) TexelWeightData[i] = 0;
+
+ List<IntegerEncoded> TexelWeightValues = new List<IntegerEncoded>();
+ BitArrayStream WeightBitStream = new BitArrayStream(new BitArray(TexelWeightData));
+
+ IntegerEncoded.DecodeIntegerSequence(TexelWeightValues, WeightBitStream, TexelParams.MaxWeight, TexelParams.GetNumWeightValues());
+
+ // Blocks can be at most 12x12, so we can have as many as 144 weights
+ int[][] Weights = new int[2][];
+ Weights[0] = new int[144];
+ Weights[1] = new int[144];
+
+ UnquantizeTexelWeights(Weights, TexelWeightValues, TexelParams, BlockWidth, BlockHeight);
+
+ // Now that we have endpoints and weights, we can interpolate and generate
+ // the proper decoding...
+ for (int j = 0; j < BlockHeight; j++)
+ {
+ for (int i = 0; i < BlockWidth; i++)
+ {
+ int Partition = Select2DPartition(PartitionIndex, i, j, NumberPartitions, ((BlockHeight * BlockWidth) < 32));
+ Debug.Assert(Partition < NumberPartitions);
+
+ ASTCPixel Pixel = new ASTCPixel(0, 0, 0, 0);
+ for (int Component = 0; Component < 4; Component++)
+ {
+ int Component0 = EndPoints[Partition][0].GetComponent(Component);
+ Component0 = BitArrayStream.Replicate(Component0, 8, 16);
+ int Component1 = EndPoints[Partition][1].GetComponent(Component);
+ Component1 = BitArrayStream.Replicate(Component1, 8, 16);
+
+ int Plane = 0;
+
+ if (TexelParams.DualPlane && (((PlaneIndices + 1) & 3) == Component))
+ {
+ Plane = 1;
+ }
+
+ int Weight = Weights[Plane][j * BlockWidth + i];
+ int FinalComponent = (Component0 * (64 - Weight) + Component1 * Weight + 32) / 64;
+
+ if (FinalComponent == 65535)
+ {
+ Pixel.SetComponent(Component, 255);
+ }
+ else
+ {
+ double FinalComponentFloat = FinalComponent;
+ Pixel.SetComponent(Component, (int)(255.0 * (FinalComponentFloat / 65536.0) + 0.5));
+ }
+ }
+
+ OutputBuffer[j * BlockWidth + i] = Pixel.Pack();
+ }
+ }
+
+ return true;
+ }
+
+ private static int Select2DPartition(int Seed, int X, int Y, int PartitionCount, bool IsSmallBlock)
+ {
+ return SelectPartition(Seed, X, Y, 0, PartitionCount, IsSmallBlock);
+ }
+
+ private static int SelectPartition(int Seed, int X, int Y, int Z, int PartitionCount, bool IsSmallBlock)
+ {
+ if (PartitionCount == 1)
+ {
+ return 0;
+ }
+
+ if (IsSmallBlock)
+ {
+ X <<= 1;
+ Y <<= 1;
+ Z <<= 1;
+ }
+
+ Seed += (PartitionCount - 1) * 1024;
+
+ int RightNum = Hash52((uint)Seed);
+ byte Seed01 = (byte)(RightNum & 0xF);
+ byte Seed02 = (byte)((RightNum >> 4) & 0xF);
+ byte Seed03 = (byte)((RightNum >> 8) & 0xF);
+ byte Seed04 = (byte)((RightNum >> 12) & 0xF);
+ byte Seed05 = (byte)((RightNum >> 16) & 0xF);
+ byte Seed06 = (byte)((RightNum >> 20) & 0xF);
+ byte Seed07 = (byte)((RightNum >> 24) & 0xF);
+ byte Seed08 = (byte)((RightNum >> 28) & 0xF);
+ byte Seed09 = (byte)((RightNum >> 18) & 0xF);
+ byte Seed10 = (byte)((RightNum >> 22) & 0xF);
+ byte Seed11 = (byte)((RightNum >> 26) & 0xF);
+ byte Seed12 = (byte)(((RightNum >> 30) | (RightNum << 2)) & 0xF);
+
+ Seed01 *= Seed01; Seed02 *= Seed02;
+ Seed03 *= Seed03; Seed04 *= Seed04;
+ Seed05 *= Seed05; Seed06 *= Seed06;
+ Seed07 *= Seed07; Seed08 *= Seed08;
+ Seed09 *= Seed09; Seed10 *= Seed10;
+ Seed11 *= Seed11; Seed12 *= Seed12;
+
+ int SeedHash1, SeedHash2, SeedHash3;
+
+ if ((Seed & 1) != 0)
+ {
+ SeedHash1 = (Seed & 2) != 0 ? 4 : 5;
+ SeedHash2 = (PartitionCount == 3) ? 6 : 5;
+ }
+ else
+ {
+ SeedHash1 = (PartitionCount == 3) ? 6 : 5;
+ SeedHash2 = (Seed & 2) != 0 ? 4 : 5;
+ }
+
+ SeedHash3 = (Seed & 0x10) != 0 ? SeedHash1 : SeedHash2;
+
+ Seed01 >>= SeedHash1; Seed02 >>= SeedHash2; Seed03 >>= SeedHash1; Seed04 >>= SeedHash2;
+ Seed05 >>= SeedHash1; Seed06 >>= SeedHash2; Seed07 >>= SeedHash1; Seed08 >>= SeedHash2;
+ Seed09 >>= SeedHash3; Seed10 >>= SeedHash3; Seed11 >>= SeedHash3; Seed12 >>= SeedHash3;
+
+ int a = Seed01 * X + Seed02 * Y + Seed11 * Z + (RightNum >> 14);
+ int b = Seed03 * X + Seed04 * Y + Seed12 * Z + (RightNum >> 10);
+ int c = Seed05 * X + Seed06 * Y + Seed09 * Z + (RightNum >> 6);
+ int d = Seed07 * X + Seed08 * Y + Seed10 * Z + (RightNum >> 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 int Hash52(uint Val)
+ {
+ Val ^= Val >> 15; Val -= Val << 17; Val += Val << 7; Val += Val << 4;
+ Val ^= Val >> 5; Val += Val << 16; Val ^= Val >> 7; Val ^= Val >> 3;
+ Val ^= Val << 6; Val ^= Val >> 17;
+
+ return (int)Val;
+ }
+
+ static void UnquantizeTexelWeights(
+ int[][] OutputBuffer,
+ List<IntegerEncoded> Weights,
+ TexelWeightParams TexelParams,
+ int BlockWidth,
+ int BlockHeight)
+ {
+ int WeightIndices = 0;
+ int[][] Unquantized = new int[2][];
+ Unquantized[0] = new int[144];
+ Unquantized[1] = new int[144];
+
+ for (int i = 0; i < Weights.Count; i++)
+ {
+ Unquantized[0][WeightIndices] = UnquantizeTexelWeight(Weights[i]);
+
+ if (TexelParams.DualPlane)
+ {
+ i++;
+ Unquantized[1][WeightIndices] = UnquantizeTexelWeight(Weights[i]);
+
+ if (i == Weights.Count)
+ {
+ break;
+ }
+ }
+
+ if (++WeightIndices >= (TexelParams.Width * TexelParams.Height)) break;
+ }
+
+ // Do infill if necessary (Section C.2.18) ...
+ int Ds = (1024 + (BlockWidth / 2)) / (BlockWidth - 1);
+ int Dt = (1024 + (BlockHeight / 2)) / (BlockHeight - 1);
+
+ int PlaneScale = TexelParams.DualPlane ? 2 : 1;
+
+ for (int Plane = 0; Plane < PlaneScale; Plane++)
+ {
+ for (int t = 0; t < BlockHeight; t++)
+ {
+ for (int s = 0; s < BlockWidth; s++)
+ {
+ int cs = Ds * s;
+ int ct = Dt * t;
+
+ int gs = (cs * (TexelParams.Width - 1) + 32) >> 6;
+ int gt = (ct * (TexelParams.Height - 1) + 32) >> 6;
+
+ int js = gs >> 4;
+ int fs = gs & 0xF;
+
+ int jt = gt >> 4;
+ int ft = gt & 0x0F;
+
+ int w11 = (fs * ft + 8) >> 4;
+ int w10 = ft - w11;
+ int w01 = fs - w11;
+ int w00 = 16 - fs - ft + w11;
+
+ int v0 = js + jt * TexelParams.Width;
+
+ int p00 = 0;
+ int p01 = 0;
+ int p10 = 0;
+ int p11 = 0;
+
+ if (v0 < (TexelParams.Width * TexelParams.Height))
+ {
+ p00 = Unquantized[Plane][v0];
+ }
+
+ if (v0 + 1 < (TexelParams.Width * TexelParams.Height))
+ {
+ p01 = Unquantized[Plane][v0 + 1];
+ }
+
+ if (v0 + TexelParams.Width < (TexelParams.Width * TexelParams.Height))
+ {
+ p10 = Unquantized[Plane][v0 + TexelParams.Width];
+ }
+
+ if (v0 + TexelParams.Width + 1 < (TexelParams.Width * TexelParams.Height))
+ {
+ p11 = Unquantized[Plane][v0 + TexelParams.Width + 1];
+ }
+
+ OutputBuffer[Plane][t * BlockWidth + s] = (p00 * w00 + p01 * w01 + p10 * w10 + p11 * w11 + 8) >> 4;
+ }
+ }
+ }
+ }
+
+ static int UnquantizeTexelWeight(IntegerEncoded IntEncoded)
+ {
+ int BitValue = IntEncoded.BitValue;
+ int BitLength = IntEncoded.NumberBits;
+
+ int A = BitArrayStream.Replicate(BitValue & 1, 1, 7);
+ int B = 0, C = 0, D = 0;
+
+ int Result = 0;
+
+ switch (IntEncoded.GetEncoding())
+ {
+ case IntegerEncoded.EIntegerEncoding.JustBits:
+ Result = BitArrayStream.Replicate(BitValue, BitLength, 6);
+ break;
+
+ case IntegerEncoded.EIntegerEncoding.Trit:
+ {
+ D = IntEncoded.TritValue;
+ Debug.Assert(D < 3);
+
+ switch (BitLength)
+ {
+ case 0:
+ {
+ int[] Results = { 0, 32, 63 };
+ Result = Results[D];
+
+ break;
+ }
+
+ case 1:
+ {
+ C = 50;
+ break;
+ }
+
+ case 2:
+ {
+ C = 23;
+ int b = (BitValue >> 1) & 1;
+ B = (b << 6) | (b << 2) | b;
+
+ break;
+ }
+
+ case 3:
+ {
+ C = 11;
+ int cb = (BitValue >> 1) & 3;
+ B = (cb << 5) | cb;
+
+ break;
+ }
+
+ default:
+ throw new ASTCDecoderException("Invalid trit encoding for texel weight");
+ }
+
+ break;
+ }
+
+ case IntegerEncoded.EIntegerEncoding.Quint:
+ {
+ D = IntEncoded.QuintValue;
+ Debug.Assert(D < 5);
+
+ switch (BitLength)
+ {
+ case 0:
+ {
+ int[] Results = { 0, 16, 32, 47, 63 };
+ Result = Results[D];
+
+ break;
+ }
+
+ case 1:
+ {
+ C = 28;
+
+ break;
+ }
+
+ case 2:
+ {
+ C = 13;
+ int b = (BitValue >> 1) & 1;
+ B = (b << 6) | (b << 1);
+
+ break;
+ }
+
+ default:
+ throw new ASTCDecoderException("Invalid quint encoding for texel weight");
+ }
+
+ break;
+ }
+ }
+
+ if (IntEncoded.GetEncoding() != IntegerEncoded.EIntegerEncoding.JustBits && BitLength > 0)
+ {
+ // Decode the value...
+ Result = D * C + B;
+ Result ^= A;
+ Result = (A & 0x20) | (Result >> 2);
+ }
+
+ Debug.Assert(Result < 64);
+
+ // Change from [0,63] to [0,64]
+ if (Result > 32)
+ {
+ Result += 1;
+ }
+
+ return Result;
+ }
+
+ static byte ReverseByte(byte b)
+ {
+ // Taken from http://graphics.stanford.edu/~seander/bithacks.html#ReverseByteWith64Bits
+ return (byte)((((b) * 0x80200802L) & 0x0884422110L) * 0x0101010101L >> 32);
+ }
+
+ static uint[] ReadUintColorValues(int Number, int[] ColorValues, ref int ColorValuesPosition)
+ {
+ uint[] Ret = new uint[Number];
+
+ for (int i = 0; i < Number; i++)
+ {
+ Ret[i] = (uint)ColorValues[ColorValuesPosition++];
+ }
+
+ return Ret;
+ }
+
+ static int[] ReadIntColorValues(int Number, int[] ColorValues, ref int ColorValuesPosition)
+ {
+ int[] Ret = new int[Number];
+
+ for (int i = 0; i < Number; i++)
+ {
+ Ret[i] = ColorValues[ColorValuesPosition++];
+ }
+
+ return Ret;
+ }
+
+ static void ComputeEndpoints(
+ ASTCPixel[] EndPoints,
+ int[] ColorValues,
+ uint ColorEndpointMode,
+ ref int ColorValuesPosition)
+ {
+ switch (ColorEndpointMode)
+ {
+ case 0:
+ {
+ uint[] Val = ReadUintColorValues(2, ColorValues, ref ColorValuesPosition);
+
+ EndPoints[0] = new ASTCPixel(0xFF, (short)Val[0], (short)Val[0], (short)Val[0]);
+ EndPoints[1] = new ASTCPixel(0xFF, (short)Val[1], (short)Val[1], (short)Val[1]);
+
+ break;
+ }
+
+
+ case 1:
+ {
+ uint[] Val = ReadUintColorValues(2, ColorValues, ref ColorValuesPosition);
+ int L0 = (int)((Val[0] >> 2) | (Val[1] & 0xC0));
+ int L1 = (int)Math.Max(L0 + (Val[1] & 0x3F), 0xFFU);
+
+ EndPoints[0] = new ASTCPixel(0xFF, (short)L0, (short)L0, (short)L0);
+ EndPoints[1] = new ASTCPixel(0xFF, (short)L1, (short)L1, (short)L1);
+
+ break;
+ }
+
+ case 4:
+ {
+ uint[] Val = ReadUintColorValues(4, ColorValues, ref ColorValuesPosition);
+
+ EndPoints[0] = new ASTCPixel((short)Val[2], (short)Val[0], (short)Val[0], (short)Val[0]);
+ EndPoints[1] = new ASTCPixel((short)Val[3], (short)Val[1], (short)Val[1], (short)Val[1]);
+
+ break;
+ }
+
+ case 5:
+ {
+ int[] Val = ReadIntColorValues(4, ColorValues, ref ColorValuesPosition);
+
+ BitArrayStream.BitTransferSigned(ref Val[1], ref Val[0]);
+ BitArrayStream.BitTransferSigned(ref Val[3], ref Val[2]);
+
+ EndPoints[0] = new ASTCPixel((short)Val[2], (short)Val[0], (short)Val[0], (short)Val[0]);
+ EndPoints[1] = new ASTCPixel((short)(Val[2] + Val[3]), (short)(Val[0] + Val[1]), (short)(Val[0] + Val[1]), (short)(Val[0] + Val[1]));
+
+ EndPoints[0].ClampByte();
+ EndPoints[1].ClampByte();
+
+ break;
+ }
+
+ case 6:
+ {
+ uint[] Val = ReadUintColorValues(4, ColorValues, ref ColorValuesPosition);
+
+ EndPoints[0] = new ASTCPixel(0xFF, (short)(Val[0] * Val[3] >> 8), (short)(Val[1] * Val[3] >> 8), (short)(Val[2] * Val[3] >> 8));
+ EndPoints[1] = new ASTCPixel(0xFF, (short)Val[0], (short)Val[1], (short)Val[2]);
+
+ break;
+ }
+
+ case 8:
+ {
+ uint[] Val = ReadUintColorValues(6, ColorValues, ref ColorValuesPosition);
+
+ if (Val[1] + Val[3] + Val[5] >= Val[0] + Val[2] + Val[4])
+ {
+ EndPoints[0] = new ASTCPixel(0xFF, (short)Val[0], (short)Val[2], (short)Val[4]);
+ EndPoints[1] = new ASTCPixel(0xFF, (short)Val[1], (short)Val[3], (short)Val[5]);
+ }
+ else
+ {
+ EndPoints[0] = ASTCPixel.BlueContract(0xFF, (short)Val[1], (short)Val[3], (short)Val[5]);
+ EndPoints[1] = ASTCPixel.BlueContract(0xFF, (short)Val[0], (short)Val[2], (short)Val[4]);
+ }
+
+ break;
+ }
+
+ case 9:
+ {
+ int[] Val = ReadIntColorValues(6, ColorValues, ref ColorValuesPosition);
+
+ BitArrayStream.BitTransferSigned(ref Val[1], ref Val[0]);
+ BitArrayStream.BitTransferSigned(ref Val[3], ref Val[2]);
+ BitArrayStream.BitTransferSigned(ref Val[5], ref Val[4]);
+
+ if (Val[1] + Val[3] + Val[5] >= 0)
+ {
+ EndPoints[0] = new ASTCPixel(0xFF, (short)Val[0], (short)Val[2], (short)Val[4]);
+ EndPoints[1] = new ASTCPixel(0xFF, (short)(Val[0] + Val[1]), (short)(Val[2] + Val[3]), (short)(Val[4] + Val[5]));
+ }
+ else
+ {
+ EndPoints[0] = ASTCPixel.BlueContract(0xFF, Val[0] + Val[1], Val[2] + Val[3], Val[4] + Val[5]);
+ EndPoints[1] = ASTCPixel.BlueContract(0xFF, Val[0], Val[2], Val[4]);
+ }
+
+ EndPoints[0].ClampByte();
+ EndPoints[1].ClampByte();
+
+ break;
+ }
+
+ case 10:
+ {
+ uint[] Val = ReadUintColorValues(6, ColorValues, ref ColorValuesPosition);
+
+ EndPoints[0] = new ASTCPixel((short)Val[4], (short)(Val[0] * Val[3] >> 8), (short)(Val[1] * Val[3] >> 8), (short)(Val[2] * Val[3] >> 8));
+ EndPoints[1] = new ASTCPixel((short)Val[5], (short)Val[0], (short)Val[1], (short)Val[2]);
+
+ break;
+ }
+
+ case 12:
+ {
+ uint[] Val = ReadUintColorValues(8, ColorValues, ref ColorValuesPosition);
+
+ if (Val[1] + Val[3] + Val[5] >= Val[0] + Val[2] + Val[4])
+ {
+ EndPoints[0] = new ASTCPixel((short)Val[6], (short)Val[0], (short)Val[2], (short)Val[4]);
+ EndPoints[1] = new ASTCPixel((short)Val[7], (short)Val[1], (short)Val[3], (short)Val[5]);
+ }
+ else
+ {
+ EndPoints[0] = ASTCPixel.BlueContract((short)Val[7], (short)Val[1], (short)Val[3], (short)Val[5]);
+ EndPoints[1] = ASTCPixel.BlueContract((short)Val[6], (short)Val[0], (short)Val[2], (short)Val[4]);
+ }
+
+ break;
+ }
+
+ case 13:
+ {
+ int[] Val = ReadIntColorValues(8, ColorValues, ref ColorValuesPosition);
+
+ BitArrayStream.BitTransferSigned(ref Val[1], ref Val[0]);
+ BitArrayStream.BitTransferSigned(ref Val[3], ref Val[2]);
+ BitArrayStream.BitTransferSigned(ref Val[5], ref Val[4]);
+ BitArrayStream.BitTransferSigned(ref Val[7], ref Val[6]);
+
+ if (Val[1] + Val[3] + Val[5] >= 0)
+ {
+ EndPoints[0] = new ASTCPixel((short)Val[6], (short)Val[0], (short)Val[2], (short)Val[4]);
+ EndPoints[1] = new ASTCPixel((short)(Val[7] + Val[6]), (short)(Val[0] + Val[1]), (short)(Val[2] + Val[3]), (short)(Val[4] + Val[5]));
+ }
+ else
+ {
+ EndPoints[0] = ASTCPixel.BlueContract(Val[6] + Val[7], Val[0] + Val[1], Val[2] + Val[3], Val[4] + Val[5]);
+ EndPoints[1] = ASTCPixel.BlueContract(Val[6], Val[0], Val[2], Val[4]);
+ }
+
+ EndPoints[0].ClampByte();
+ EndPoints[1].ClampByte();
+
+ break;
+ }
+
+ default:
+ throw new ASTCDecoderException("Unsupported color endpoint mode (is it HDR?)");
+ }
+ }
+
+ static void DecodeColorValues(
+ int[] OutputValues,
+ byte[] InputData,
+ uint[] Modes,
+ int NumberPartitions,
+ int NumberBitsForColorData)
+ {
+ // First figure out how many color values we have
+ int NumberValues = 0;
+
+ for (int i = 0; i < NumberPartitions; i++)
+ {
+ NumberValues += (int)((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...
+ int Range = 256;
+
+ while (--Range > 0)
+ {
+ IntegerEncoded IntEncoded = IntegerEncoded.CreateEncoding(Range);
+ int BitLength = IntEncoded.GetBitLength(NumberValues);
+
+ if (BitLength <= NumberBitsForColorData)
+ {
+ // Find the smallest possible range that matches the given encoding
+ while (--Range > 0)
+ {
+ IntegerEncoded NewIntEncoded = IntegerEncoded.CreateEncoding(Range);
+ if (!NewIntEncoded.MatchesEncoding(IntEncoded))
+ {
+ break;
+ }
+ }
+
+ // Return to last matching range.
+ Range++;
+ break;
+ }
+ }
+
+ // We now have enough to decode our integer sequence.
+ List<IntegerEncoded> IntegerEncodedSequence = new List<IntegerEncoded>();
+ BitArrayStream ColorBitStream = new BitArrayStream(new BitArray(InputData));
+
+ IntegerEncoded.DecodeIntegerSequence(IntegerEncodedSequence, ColorBitStream, Range, NumberValues);
+
+ // 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
+ int OutputIndices = 0;
+
+ foreach (IntegerEncoded IntEncoded in IntegerEncodedSequence)
+ {
+ int BitLength = IntEncoded.NumberBits;
+ int BitValue = IntEncoded.BitValue;
+
+ Debug.Assert(BitLength >= 1);
+
+ int A = 0, B = 0, C = 0, D = 0;
+ // A is just the lsb replicated 9 times.
+ A = BitArrayStream.Replicate(BitValue & 1, 1, 9);
+
+ switch (IntEncoded.GetEncoding())
+ {
+ case IntegerEncoded.EIntegerEncoding.JustBits:
+ {
+ OutputValues[OutputIndices++] = BitArrayStream.Replicate(BitValue, BitLength, 8);
+
+ break;
+ }
+
+ case IntegerEncoded.EIntegerEncoding.Trit:
+ {
+ D = IntEncoded.TritValue;
+
+ switch (BitLength)
+ {
+ case 1:
+ {
+ C = 204;
+
+ break;
+ }
+
+ case 2:
+ {
+ C = 93;
+ // B = b000b0bb0
+ int b = (BitValue >> 1) & 1;
+ B = (b << 8) | (b << 4) | (b << 2) | (b << 1);
+
+ break;
+ }
+
+ case 3:
+ {
+ C = 44;
+ // B = cb000cbcb
+ int cb = (BitValue >> 1) & 3;
+ B = (cb << 7) | (cb << 2) | cb;
+
+ break;
+ }
+
+
+ case 4:
+ {
+ C = 22;
+ // B = dcb000dcb
+ int dcb = (BitValue >> 1) & 7;
+ B = (dcb << 6) | dcb;
+
+ break;
+ }
+
+ case 5:
+ {
+ C = 11;
+ // B = edcb000ed
+ int edcb = (BitValue >> 1) & 0xF;
+ B = (edcb << 5) | (edcb >> 2);
+
+ break;
+ }
+
+ case 6:
+ {
+ C = 5;
+ // B = fedcb000f
+ int fedcb = (BitValue >> 1) & 0x1F;
+ B = (fedcb << 4) | (fedcb >> 4);
+
+ break;
+ }
+
+ default:
+ throw new ASTCDecoderException("Unsupported trit encoding for color values!");
+ }
+
+ break;
+ }
+
+ case IntegerEncoded.EIntegerEncoding.Quint:
+ {
+ D = IntEncoded.QuintValue;
+
+ switch (BitLength)
+ {
+ case 1:
+ {
+ C = 113;
+
+ break;
+ }
+
+ case 2:
+ {
+ C = 54;
+ // B = b0000bb00
+ int b = (BitValue >> 1) & 1;
+ B = (b << 8) | (b << 3) | (b << 2);
+
+ break;
+ }
+
+ case 3:
+ {
+ C = 26;
+ // B = cb0000cbc
+ int cb = (BitValue >> 1) & 3;
+ B = (cb << 7) | (cb << 1) | (cb >> 1);
+
+ break;
+ }
+
+ case 4:
+ {
+ C = 13;
+ // B = dcb0000dc
+ int dcb = (BitValue >> 1) & 7;
+ B = (dcb << 6) | (dcb >> 1);
+
+ break;
+ }
+
+ case 5:
+ {
+ C = 6;
+ // B = edcb0000e
+ int edcb = (BitValue >> 1) & 0xF;
+ B = (edcb << 5) | (edcb >> 3);
+
+ break;
+ }
+
+ default:
+ throw new ASTCDecoderException("Unsupported quint encoding for color values!");
+ }
+ break;
+ }
+ }
+
+ if (IntEncoded.GetEncoding() != IntegerEncoded.EIntegerEncoding.JustBits)
+ {
+ int T = D * C + B;
+ T ^= A;
+ T = (A & 0x80) | (T >> 2);
+
+ OutputValues[OutputIndices++] = T;
+ }
+ }
+
+ // Make sure that each of our values is in the proper range...
+ for (int i = 0; i < NumberValues; i++)
+ {
+ Debug.Assert(OutputValues[i] <= 255);
+ }
+ }
+
+ static void FillVoidExtentLDR(BitArrayStream BitStream, int[] OutputBuffer, int BlockWidth, int BlockHeight)
+ {
+ // Don't actually care about the void extent, just read the bits...
+ for (int i = 0; i < 4; ++i)
+ {
+ BitStream.ReadBits(13);
+ }
+
+ // Decode the RGBA components and renormalize them to the range [0, 255]
+ ushort R = (ushort)BitStream.ReadBits(16);
+ ushort G = (ushort)BitStream.ReadBits(16);
+ ushort B = (ushort)BitStream.ReadBits(16);
+ ushort A = (ushort)BitStream.ReadBits(16);
+
+ int RGBA = (R >> 8) | (G & 0xFF00) | ((B) & 0xFF00) << 8 | ((A) & 0xFF00) << 16;
+
+ for (int j = 0; j < BlockHeight; j++)
+ {
+ for (int i = 0; i < BlockWidth; i++)
+ {
+ OutputBuffer[j * BlockWidth + i] = RGBA;
+ }
+ }
+ }
+
+ static TexelWeightParams DecodeBlockInfo(BitArrayStream BitStream)
+ {
+ TexelWeightParams TexelParams = new TexelWeightParams();
+
+ // Read the entire block mode all at once
+ ushort ModeBits = (ushort)BitStream.ReadBits(11);
+
+ // Does this match the void extent block mode?
+ if ((ModeBits & 0x01FF) == 0x1FC)
+ {
+ if ((ModeBits & 0x200) != 0)
+ {
+ TexelParams.VoidExtentHDR = true;
+ }
+ else
+ {
+ TexelParams.VoidExtentLDR = true;
+ }
+
+ // Next two bits must be one.
+ if ((ModeBits & 0x400) == 0 || BitStream.ReadBits(1) == 0)
+ {
+ TexelParams.Error = true;
+ }
+
+ return TexelParams;
+ }
+
+ // First check if the last four bits are zero
+ if ((ModeBits & 0xF) == 0)
+ {
+ TexelParams.Error = true;
+ return TexelParams;
+ }
+
+ // 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)
+ {
+ TexelParams.Error = true;
+
+ return TexelParams;
+ }
+
+ // 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.
+ int Layout = 0;
+
+ if ((ModeBits & 0x1) != 0 || (ModeBits & 0x2) != 0)
+ {
+ // layout is in [0-4]
+ if ((ModeBits & 0x8) != 0)
+ {
+ // layout is in [2-4]
+ if ((ModeBits & 0x4) != 0)
+ {
+ // layout is in [3-4]
+ if ((ModeBits & 0x100) != 0)
+ {
+ Layout = 4;
+ }
+ else
+ {
+ Layout = 3;
+ }
+ }
+ else
+ {
+ Layout = 2;
+ }
+ }
+ else
+ {
+ // layout is in [0-1]
+ if ((ModeBits & 0x4) != 0)
+ {
+ Layout = 1;
+ }
+ else
+ {
+ Layout = 0;
+ }
+ }
+ }
+ else
+ {
+ // layout is in [5-9]
+ if ((ModeBits & 0x100) != 0)
+ {
+ // layout is in [7-9]
+ if ((ModeBits & 0x80) != 0)
+ {
+ // layout is in [7-8]
+ Debug.Assert((ModeBits & 0x40) == 0);
+
+ if ((ModeBits & 0x20) != 0)
+ {
+ Layout = 8;
+ }
+ else
+ {
+ Layout = 7;
+ }
+ }
+ else
+ {
+ Layout = 9;
+ }
+ }
+ else
+ {
+ // layout is in [5-6]
+ if ((ModeBits & 0x80) != 0)
+ {
+ Layout = 6;
+ }
+ else
+ {
+ Layout = 5;
+ }
+ }
+ }
+
+ Debug.Assert(Layout < 10);
+
+ // Determine R
+ int R = (ModeBits >> 4) & 1;
+ if (Layout < 5)
+ {
+ R |= (ModeBits & 0x3) << 1;
+ }
+ else
+ {
+ R |= (ModeBits & 0xC) >> 1;
+ }
+
+ Debug.Assert(2 <= R && R <= 7);
+
+ // Determine width & height
+ switch (Layout)
+ {
+ case 0:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+ int B = (ModeBits >> 7) & 0x3;
+
+ TexelParams.Width = B + 4;
+ TexelParams.Height = A + 2;
+
+ break;
+ }
+
+ case 1:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+ int B = (ModeBits >> 7) & 0x3;
+
+ TexelParams.Width = B + 8;
+ TexelParams.Height = A + 2;
+
+ break;
+ }
+
+ case 2:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+ int B = (ModeBits >> 7) & 0x3;
+
+ TexelParams.Width = A + 2;
+ TexelParams.Height = B + 8;
+
+ break;
+ }
+
+ case 3:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+ int B = (ModeBits >> 7) & 0x1;
+
+ TexelParams.Width = A + 2;
+ TexelParams.Height = B + 6;
+
+ break;
+ }
+
+ case 4:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+ int B = (ModeBits >> 7) & 0x1;
+
+ TexelParams.Width = B + 2;
+ TexelParams.Height = A + 2;
+
+ break;
+ }
+
+ case 5:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+
+ TexelParams.Width = 12;
+ TexelParams.Height = A + 2;
+
+ break;
+ }
+
+ case 6:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+
+ TexelParams.Width = A + 2;
+ TexelParams.Height = 12;
+
+ break;
+ }
+
+ case 7:
+ {
+ TexelParams.Width = 6;
+ TexelParams.Height = 10;
+
+ break;
+ }
+
+ case 8:
+ {
+ TexelParams.Width = 10;
+ TexelParams.Height = 6;
+ break;
+ }
+
+ case 9:
+ {
+ int A = (ModeBits >> 5) & 0x3;
+ int B = (ModeBits >> 9) & 0x3;
+
+ TexelParams.Width = A + 6;
+ TexelParams.Height = B + 6;
+
+ break;
+ }
+
+ default:
+ //Don't know this layout...
+ TexelParams.Error = true;
+ break;
+ }
+
+ // Determine whether or not we're using dual planes
+ // and/or high precision layouts.
+ bool D = ((Layout != 9) && ((ModeBits & 0x400) != 0));
+ bool H = (Layout != 9) && ((ModeBits & 0x200) != 0);
+
+ if (H)
+ {
+ int[] MaxWeights = { 9, 11, 15, 19, 23, 31 };
+ TexelParams.MaxWeight = MaxWeights[R - 2];
+ }
+ else
+ {
+ int[] MaxWeights = { 1, 2, 3, 4, 5, 7 };
+ TexelParams.MaxWeight = MaxWeights[R - 2];
+ }
+
+ TexelParams.DualPlane = D;
+
+ return TexelParams;
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-12 23:21:46 +0000