diff options
Diffstat (limited to 'Ryujinx.Graphics/Graphics3d/Texture/ASTCDecoder.cs')
| -rw-r--r-- | Ryujinx.Graphics/Graphics3d/Texture/ASTCDecoder.cs | 1385 |
1 files changed, 0 insertions, 1385 deletions
diff --git a/Ryujinx.Graphics/Graphics3d/Texture/ASTCDecoder.cs b/Ryujinx.Graphics/Graphics3d/Texture/ASTCDecoder.cs deleted file mode 100644 index 00158dc1..00000000 --- a/Ryujinx.Graphics/Graphics3d/Texture/ASTCDecoder.cs +++ /dev/null @@ -1,1385 +0,0 @@ -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) - { - // TODO: Support 3D textures? - 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; - } - } -} |