1385 lines
48 KiB
C#
1385 lines
48 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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namespace Ryujinx.Graphics.Gal.Texture
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{
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public class ASTCDecoderException : Exception
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{
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public ASTCDecoderException(string ExMsg) : base(ExMsg) { Switch_Toolbox.Library.Forms.STErrorDialog.Show(ExMsg, "", ExMsg); }
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}
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//https://github.com/GammaUNC/FasTC/blob/master/ASTCEncoder/src/Decompressor.cpp
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public static class ASTCDecoder
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{
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struct TexelWeightParams
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{
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public int Width;
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public int Height;
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public bool DualPlane;
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public int MaxWeight;
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public bool Error;
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public bool VoidExtentLDR;
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public bool VoidExtentHDR;
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public int GetPackedBitSize()
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{
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// How many indices do we have?
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int Indices = Height * Width;
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if (DualPlane)
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{
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Indices *= 2;
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}
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IntegerEncoded IntEncoded = IntegerEncoded.CreateEncoding(MaxWeight);
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return IntEncoded.GetBitLength(Indices);
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}
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public int GetNumWeightValues()
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{
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int Ret = Width * Height;
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if (DualPlane)
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{
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Ret *= 2;
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}
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return Ret;
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}
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}
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public static byte[] DecodeToRGBA8888(
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byte[] InputBuffer,
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int BlockX,
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int BlockY,
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int BlockZ,
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int X,
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int Y,
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int Z)
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{
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using (MemoryStream InputStream = new MemoryStream(InputBuffer))
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{
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BinaryReader BinReader = new BinaryReader(InputStream);
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if (BlockX > 12 || BlockY > 12)
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{
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throw new ASTCDecoderException("Block size unsupported!");
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}
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if (BlockZ != 1 || Z != 1)
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{
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throw new ASTCDecoderException("3D compressed textures unsupported!");
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}
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using (MemoryStream OutputStream = new MemoryStream())
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{
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int BlockIndex = 0;
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for (int j = 0; j < Y; j += BlockY)
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{
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for (int i = 0; i < X; i += BlockX)
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{
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int[] DecompressedData = new int[144];
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DecompressBlock(BinReader.ReadBytes(0x10), DecompressedData, BlockX, BlockY);
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int DecompressedWidth = Math.Min(BlockX, X - i);
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int DecompressedHeight = Math.Min(BlockY, Y - j);
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int BaseOffsets = (j * X + i) * 4;
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for (int jj = 0; jj < DecompressedHeight; jj++)
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{
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OutputStream.Seek(BaseOffsets + jj * X * 4, SeekOrigin.Begin);
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byte[] OutputBuffer = new byte[DecompressedData.Length * sizeof(int)];
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Buffer.BlockCopy(DecompressedData, 0, OutputBuffer, 0, OutputBuffer.Length);
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OutputStream.Write(OutputBuffer, jj * BlockX * 4, DecompressedWidth * 4);
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}
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BlockIndex++;
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}
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}
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return OutputStream.ToArray();
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}
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}
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}
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public static bool DecompressBlock(
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byte[] InputBuffer,
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int[] OutputBuffer,
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int BlockWidth,
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int BlockHeight)
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{
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BitArrayStream BitStream = new BitArrayStream(new BitArray(InputBuffer));
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TexelWeightParams TexelParams = DecodeBlockInfo(BitStream);
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if (TexelParams.Error)
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{
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throw new ASTCDecoderException("Invalid block mode");
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}
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if (TexelParams.VoidExtentLDR)
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{
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FillVoidExtentLDR(BitStream, OutputBuffer, BlockWidth, BlockHeight);
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return true;
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}
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if (TexelParams.VoidExtentHDR)
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{
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throw new ASTCDecoderException("HDR void extent blocks are unsupported!");
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}
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if (TexelParams.Width > BlockWidth)
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{
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throw new ASTCDecoderException("Texel weight grid width should be smaller than block width");
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}
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if (TexelParams.Height > BlockHeight)
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{
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throw new ASTCDecoderException("Texel weight grid height should be smaller than block height");
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}
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// Read num partitions
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int NumberPartitions = BitStream.ReadBits(2) + 1;
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Debug.Assert(NumberPartitions <= 4);
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if (NumberPartitions == 4 && TexelParams.DualPlane)
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{
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throw new ASTCDecoderException("Dual plane mode is incompatible with four partition blocks");
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}
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// Based on the number of partitions, read the color endpoint mode for
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// each partition.
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// Determine partitions, partition index, and color endpoint modes
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int PlaneIndices = -1;
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int PartitionIndex;
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uint[] ColorEndpointMode = { 0, 0, 0, 0 };
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BitArrayStream ColorEndpointStream = new BitArrayStream(new BitArray(16 * 8));
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// Read extra config data...
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uint BaseColorEndpointMode = 0;
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if (NumberPartitions == 1)
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{
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ColorEndpointMode[0] = (uint)BitStream.ReadBits(4);
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PartitionIndex = 0;
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}
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else
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{
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PartitionIndex = BitStream.ReadBits(10);
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BaseColorEndpointMode = (uint)BitStream.ReadBits(6);
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}
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uint BaseMode = (BaseColorEndpointMode & 3);
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// Remaining bits are color endpoint data...
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int NumberWeightBits = TexelParams.GetPackedBitSize();
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int RemainingBits = 128 - NumberWeightBits - BitStream.Position;
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// Consider extra bits prior to texel data...
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uint ExtraColorEndpointModeBits = 0;
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if (BaseMode != 0)
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{
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switch (NumberPartitions)
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{
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case 2: ExtraColorEndpointModeBits += 2; break;
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case 3: ExtraColorEndpointModeBits += 5; break;
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case 4: ExtraColorEndpointModeBits += 8; break;
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default: Debug.Assert(false); break;
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}
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}
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RemainingBits -= (int)ExtraColorEndpointModeBits;
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// Do we have a dual plane situation?
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int PlaneSelectorBits = 0;
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if (TexelParams.DualPlane)
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{
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PlaneSelectorBits = 2;
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}
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RemainingBits -= PlaneSelectorBits;
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// Read color data...
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int ColorDataBits = RemainingBits;
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while (RemainingBits > 0)
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{
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int NumberBits = Math.Min(RemainingBits, 8);
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int Bits = BitStream.ReadBits(NumberBits);
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ColorEndpointStream.WriteBits(Bits, NumberBits);
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RemainingBits -= 8;
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}
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// Read the plane selection bits
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PlaneIndices = BitStream.ReadBits(PlaneSelectorBits);
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// Read the rest of the CEM
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if (BaseMode != 0)
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{
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uint ExtraColorEndpointMode = (uint)BitStream.ReadBits((int)ExtraColorEndpointModeBits);
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uint TempColorEndpointMode = (ExtraColorEndpointMode << 6) | BaseColorEndpointMode;
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TempColorEndpointMode >>= 2;
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bool[] C = new bool[4];
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for (int i = 0; i < NumberPartitions; i++)
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{
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C[i] = (TempColorEndpointMode & 1) != 0;
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TempColorEndpointMode >>= 1;
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}
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byte[] M = new byte[4];
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for (int i = 0; i < NumberPartitions; i++)
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{
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M[i] = (byte)(TempColorEndpointMode & 3);
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TempColorEndpointMode >>= 2;
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Debug.Assert(M[i] <= 3);
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}
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for (int i = 0; i < NumberPartitions; i++)
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{
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ColorEndpointMode[i] = BaseMode;
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if (!(C[i])) ColorEndpointMode[i] -= 1;
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ColorEndpointMode[i] <<= 2;
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ColorEndpointMode[i] |= M[i];
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}
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}
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else if (NumberPartitions > 1)
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{
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uint TempColorEndpointMode = BaseColorEndpointMode >> 2;
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for (uint i = 0; i < NumberPartitions; i++)
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{
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ColorEndpointMode[i] = TempColorEndpointMode;
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}
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}
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// Make sure everything up till here is sane.
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for (int i = 0; i < NumberPartitions; i++)
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{
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Debug.Assert(ColorEndpointMode[i] < 16);
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}
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Debug.Assert(BitStream.Position + TexelParams.GetPackedBitSize() == 128);
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// Decode both color data and texel weight data
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int[] ColorValues = new int[32]; // Four values * two endpoints * four maximum partitions
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DecodeColorValues(ColorValues, ColorEndpointStream.ToByteArray(), ColorEndpointMode, NumberPartitions, ColorDataBits);
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ASTCPixel[][] EndPoints = new ASTCPixel[4][];
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EndPoints[0] = new ASTCPixel[2];
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EndPoints[1] = new ASTCPixel[2];
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EndPoints[2] = new ASTCPixel[2];
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EndPoints[3] = new ASTCPixel[2];
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int ColorValuesPosition = 0;
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for (int i = 0; i < NumberPartitions; i++)
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{
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ComputeEndpoints(EndPoints[i], ColorValues, ColorEndpointMode[i], ref ColorValuesPosition);
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}
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// Read the texel weight data.
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byte[] TexelWeightData = (byte[])InputBuffer.Clone();
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// Reverse everything
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for (int i = 0; i < 8; i++)
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{
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byte a = ReverseByte(TexelWeightData[i]);
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byte b = ReverseByte(TexelWeightData[15 - i]);
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TexelWeightData[i] = b;
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TexelWeightData[15 - i] = a;
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}
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// Make sure that higher non-texel bits are set to zero
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int ClearByteStart = (TexelParams.GetPackedBitSize() >> 3) + 1;
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TexelWeightData[ClearByteStart - 1] &= (byte)((1 << (TexelParams.GetPackedBitSize() % 8)) - 1);
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int cLen = 16 - ClearByteStart;
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for (int i = ClearByteStart; i < ClearByteStart + cLen; i++) TexelWeightData[i] = 0;
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List<IntegerEncoded> TexelWeightValues = new List<IntegerEncoded>();
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BitArrayStream WeightBitStream = new BitArrayStream(new BitArray(TexelWeightData));
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IntegerEncoded.DecodeIntegerSequence(TexelWeightValues, WeightBitStream, TexelParams.MaxWeight, TexelParams.GetNumWeightValues());
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// Blocks can be at most 12x12, so we can have as many as 144 weights
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int[][] Weights = new int[2][];
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Weights[0] = new int[144];
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Weights[1] = new int[144];
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UnquantizeTexelWeights(Weights, TexelWeightValues, TexelParams, BlockWidth, BlockHeight);
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// Now that we have endpoints and weights, we can interpolate and generate
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// the proper decoding...
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for (int j = 0; j < BlockHeight; j++)
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{
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for (int i = 0; i < BlockWidth; i++)
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{
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int Partition = Select2DPartition(PartitionIndex, i, j, NumberPartitions, ((BlockHeight * BlockWidth) < 32));
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Debug.Assert(Partition < NumberPartitions);
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ASTCPixel Pixel = new ASTCPixel(0, 0, 0, 0);
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for (int Component = 0; Component < 4; Component++)
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{
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int Component0 = EndPoints[Partition][0].GetComponent(Component);
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Component0 = BitArrayStream.Replicate(Component0, 8, 16);
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int Component1 = EndPoints[Partition][1].GetComponent(Component);
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Component1 = BitArrayStream.Replicate(Component1, 8, 16);
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int Plane = 0;
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if (TexelParams.DualPlane && (((PlaneIndices + 1) & 3) == Component))
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{
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Plane = 1;
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}
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int Weight = Weights[Plane][j * BlockWidth + i];
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int FinalComponent = (Component0 * (64 - Weight) + Component1 * Weight + 32) / 64;
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if (FinalComponent == 65535)
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{
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Pixel.SetComponent(Component, 255);
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}
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else
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{
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double FinalComponentFloat = FinalComponent;
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Pixel.SetComponent(Component, (int)(255.0 * (FinalComponentFloat / 65536.0) + 0.5));
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}
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}
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OutputBuffer[j * BlockWidth + i] = Pixel.Pack();
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}
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}
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return true;
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}
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private static int Select2DPartition(int Seed, int X, int Y, int PartitionCount, bool IsSmallBlock)
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|||
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{
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|||
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return SelectPartition(Seed, X, Y, 0, PartitionCount, IsSmallBlock);
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}
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|
|
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;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|