diff options
Diffstat (limited to 'Ryujinx.Graphics/Graphics3d/Texture/AstcDecoder.cs')
| -rw-r--r-- | Ryujinx.Graphics/Graphics3d/Texture/AstcDecoder.cs | 1385 |
1 files changed, 1385 insertions, 0 deletions
diff --git a/Ryujinx.Graphics/Graphics3d/Texture/AstcDecoder.cs b/Ryujinx.Graphics/Graphics3d/Texture/AstcDecoder.cs new file mode 100644 index 00000000..99b166f3 --- /dev/null +++ b/Ryujinx.Graphics/Graphics3d/Texture/AstcDecoder.cs @@ -0,0 +1,1385 @@ +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 b2 = (bitValue >> 1) & 1; + b = (b2 << 6) | (b2 << 2) | b2; + + 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 b2 = (bitValue >> 1) & 1; + b = (b2 << 6) | (b2 << 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 b2 = (bitValue >> 1) & 1; + b = (b2 << 8) | (b2 << 4) | (b2 << 2) | (b2 << 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 b2 = (bitValue >> 1) & 1; + b = (b2 << 8) | (b2 << 3) | (b2 << 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; + } + } +} |