mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-08-20 07:38:42 +02:00
1328 lines
54 KiB
C#
1328 lines
54 KiB
C#
|
using System;
|
|||
|
using System.Diagnostics;
|
|||
|
using System.Runtime.CompilerServices;
|
|||
|
using System.Runtime.Intrinsics;
|
|||
|
using System.Runtime.Intrinsics.X86;
|
|||
|
|
|||
|
namespace Ryujinx.Graphics.Texture.Utils
|
|||
|
{
|
|||
|
static class BC67Utils
|
|||
|
{
|
|||
|
private static byte[][] _quantizationLut;
|
|||
|
private static byte[][] _quantizationLutNoPBit;
|
|||
|
|
|||
|
static BC67Utils()
|
|||
|
{
|
|||
|
_quantizationLut = new byte[5][];
|
|||
|
_quantizationLutNoPBit = new byte[5][];
|
|||
|
|
|||
|
for (int depth = 4; depth < 9; depth++)
|
|||
|
{
|
|||
|
byte[] lut = new byte[512];
|
|||
|
byte[] lutNoPBit = new byte[256];
|
|||
|
|
|||
|
for (int i = 0; i < lut.Length; i++)
|
|||
|
{
|
|||
|
lut[i] = QuantizeComponentForLut((byte)i, depth, i >> 8);
|
|||
|
|
|||
|
if (i < lutNoPBit.Length)
|
|||
|
{
|
|||
|
lutNoPBit[i] = QuantizeComponentForLut((byte)i, depth);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
_quantizationLut[depth - 4] = lut;
|
|||
|
_quantizationLutNoPBit[depth - 4] = lutNoPBit;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
public static (RgbaColor8, RgbaColor8) GetMinMaxColors(ReadOnlySpan<uint> tile, int w, int h)
|
|||
|
{
|
|||
|
if (Sse41.IsSupported && w == 4 && h == 4)
|
|||
|
{
|
|||
|
GetMinMaxColorsOneSubset4x4Sse41(tile, out RgbaColor8 minColor, out RgbaColor8 maxColor);
|
|||
|
|
|||
|
return (minColor, maxColor);
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
RgbaColor8 minColor = new RgbaColor8(255, 255, 255, 255);
|
|||
|
RgbaColor8 maxColor = default;
|
|||
|
|
|||
|
for (int i = 0; i < tile.Length; i++)
|
|||
|
{
|
|||
|
RgbaColor8 color = RgbaColor8.FromUInt32(tile[i]);
|
|||
|
|
|||
|
minColor.R = Math.Min(minColor.R, color.R);
|
|||
|
minColor.G = Math.Min(minColor.G, color.G);
|
|||
|
minColor.B = Math.Min(minColor.B, color.B);
|
|||
|
minColor.A = Math.Min(minColor.A, color.A);
|
|||
|
|
|||
|
maxColor.R = Math.Max(maxColor.R, color.R);
|
|||
|
maxColor.G = Math.Max(maxColor.G, color.G);
|
|||
|
maxColor.B = Math.Max(maxColor.B, color.B);
|
|||
|
maxColor.A = Math.Max(maxColor.A, color.A);
|
|||
|
}
|
|||
|
|
|||
|
return (minColor, maxColor);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
public static void GetMinMaxColors(
|
|||
|
ReadOnlySpan<byte> partitionTable,
|
|||
|
ReadOnlySpan<uint> tile,
|
|||
|
int w,
|
|||
|
int h,
|
|||
|
Span<RgbaColor8> minColors,
|
|||
|
Span<RgbaColor8> maxColors,
|
|||
|
int subsetCount)
|
|||
|
{
|
|||
|
if (Sse41.IsSupported && w == 4 && h == 4)
|
|||
|
{
|
|||
|
if (subsetCount == 1)
|
|||
|
{
|
|||
|
GetMinMaxColorsOneSubset4x4Sse41(tile, out minColors[0], out maxColors[0]);
|
|||
|
return;
|
|||
|
}
|
|||
|
else if (subsetCount == 2)
|
|||
|
{
|
|||
|
GetMinMaxColorsTwoSubsets4x4Sse41(partitionTable, tile, minColors, maxColors);
|
|||
|
return;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
minColors.Fill(new RgbaColor8(255, 255, 255, 255));
|
|||
|
|
|||
|
int i = 0;
|
|||
|
for (int ty = 0; ty < h; ty++)
|
|||
|
{
|
|||
|
for (int tx = 0; tx < w; tx++)
|
|||
|
{
|
|||
|
int subset = partitionTable[ty * w + tx];
|
|||
|
RgbaColor8 color = RgbaColor8.FromUInt32(tile[i++]);
|
|||
|
|
|||
|
minColors[subset].R = Math.Min(minColors[subset].R, color.R);
|
|||
|
minColors[subset].G = Math.Min(minColors[subset].G, color.G);
|
|||
|
minColors[subset].B = Math.Min(minColors[subset].B, color.B);
|
|||
|
minColors[subset].A = Math.Min(minColors[subset].A, color.A);
|
|||
|
|
|||
|
maxColors[subset].R = Math.Max(maxColors[subset].R, color.R);
|
|||
|
maxColors[subset].G = Math.Max(maxColors[subset].G, color.G);
|
|||
|
maxColors[subset].B = Math.Max(maxColors[subset].B, color.B);
|
|||
|
maxColors[subset].A = Math.Max(maxColors[subset].A, color.A);
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe void GetMinMaxColorsOneSubset4x4Sse41(ReadOnlySpan<uint> tile, out RgbaColor8 minColor, out RgbaColor8 maxColor)
|
|||
|
{
|
|||
|
Vector128<byte> min = Vector128<byte>.AllBitsSet;
|
|||
|
Vector128<byte> max = Vector128<byte>.Zero;
|
|||
|
Vector128<byte> row0, row1, row2, row3;
|
|||
|
|
|||
|
fixed (uint* pTile = tile)
|
|||
|
{
|
|||
|
row0 = Sse2.LoadVector128(pTile).AsByte();
|
|||
|
row1 = Sse2.LoadVector128(pTile + 4).AsByte();
|
|||
|
row2 = Sse2.LoadVector128(pTile + 8).AsByte();
|
|||
|
row3 = Sse2.LoadVector128(pTile + 12).AsByte();
|
|||
|
}
|
|||
|
|
|||
|
min = Sse2.Min(min, row0);
|
|||
|
max = Sse2.Max(max, row0);
|
|||
|
min = Sse2.Min(min, row1);
|
|||
|
max = Sse2.Max(max, row1);
|
|||
|
min = Sse2.Min(min, row2);
|
|||
|
max = Sse2.Max(max, row2);
|
|||
|
min = Sse2.Min(min, row3);
|
|||
|
max = Sse2.Max(max, row3);
|
|||
|
|
|||
|
minColor = HorizontalMin(min);
|
|||
|
maxColor = HorizontalMax(max);
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe void GetMinMaxColorsTwoSubsets4x4Sse41(
|
|||
|
ReadOnlySpan<byte> partitionTable,
|
|||
|
ReadOnlySpan<uint> tile,
|
|||
|
Span<RgbaColor8> minColors,
|
|||
|
Span<RgbaColor8> maxColors)
|
|||
|
{
|
|||
|
Vector128<byte> partitionMask;
|
|||
|
|
|||
|
fixed (byte* pPartitionTable = partitionTable)
|
|||
|
{
|
|||
|
partitionMask = Sse2.LoadVector128(pPartitionTable);
|
|||
|
}
|
|||
|
|
|||
|
Vector128<byte> subset0Mask = Sse2.CompareEqual(partitionMask, Vector128<byte>.Zero);
|
|||
|
|
|||
|
Vector128<byte> subset0MaskRep16Low = Sse2.UnpackLow(subset0Mask, subset0Mask);
|
|||
|
Vector128<byte> subset0MaskRep16High = Sse2.UnpackHigh(subset0Mask, subset0Mask);
|
|||
|
|
|||
|
Vector128<byte> subset0Mask0 = Sse2.UnpackLow(subset0MaskRep16Low.AsInt16(), subset0MaskRep16Low.AsInt16()).AsByte();
|
|||
|
Vector128<byte> subset0Mask1 = Sse2.UnpackHigh(subset0MaskRep16Low.AsInt16(), subset0MaskRep16Low.AsInt16()).AsByte();
|
|||
|
Vector128<byte> subset0Mask2 = Sse2.UnpackLow(subset0MaskRep16High.AsInt16(), subset0MaskRep16High.AsInt16()).AsByte();
|
|||
|
Vector128<byte> subset0Mask3 = Sse2.UnpackHigh(subset0MaskRep16High.AsInt16(), subset0MaskRep16High.AsInt16()).AsByte();
|
|||
|
|
|||
|
Vector128<byte> min0 = Vector128<byte>.AllBitsSet;
|
|||
|
Vector128<byte> min1 = Vector128<byte>.AllBitsSet;
|
|||
|
Vector128<byte> max0 = Vector128<byte>.Zero;
|
|||
|
Vector128<byte> max1 = Vector128<byte>.Zero;
|
|||
|
|
|||
|
Vector128<byte> row0, row1, row2, row3;
|
|||
|
|
|||
|
fixed (uint* pTile = tile)
|
|||
|
{
|
|||
|
row0 = Sse2.LoadVector128(pTile).AsByte();
|
|||
|
row1 = Sse2.LoadVector128(pTile + 4).AsByte();
|
|||
|
row2 = Sse2.LoadVector128(pTile + 8).AsByte();
|
|||
|
row3 = Sse2.LoadVector128(pTile + 12).AsByte();
|
|||
|
}
|
|||
|
|
|||
|
min0 = Sse2.Min(min0, Sse41.BlendVariable(min0, row0, subset0Mask0));
|
|||
|
min0 = Sse2.Min(min0, Sse41.BlendVariable(min0, row1, subset0Mask1));
|
|||
|
min0 = Sse2.Min(min0, Sse41.BlendVariable(min0, row2, subset0Mask2));
|
|||
|
min0 = Sse2.Min(min0, Sse41.BlendVariable(min0, row3, subset0Mask3));
|
|||
|
|
|||
|
min1 = Sse2.Min(min1, Sse2.Or(row0, subset0Mask0));
|
|||
|
min1 = Sse2.Min(min1, Sse2.Or(row1, subset0Mask1));
|
|||
|
min1 = Sse2.Min(min1, Sse2.Or(row2, subset0Mask2));
|
|||
|
min1 = Sse2.Min(min1, Sse2.Or(row3, subset0Mask3));
|
|||
|
|
|||
|
max0 = Sse2.Max(max0, Sse2.And(row0, subset0Mask0));
|
|||
|
max0 = Sse2.Max(max0, Sse2.And(row1, subset0Mask1));
|
|||
|
max0 = Sse2.Max(max0, Sse2.And(row2, subset0Mask2));
|
|||
|
max0 = Sse2.Max(max0, Sse2.And(row3, subset0Mask3));
|
|||
|
|
|||
|
max1 = Sse2.Max(max1, Sse2.AndNot(subset0Mask0, row0));
|
|||
|
max1 = Sse2.Max(max1, Sse2.AndNot(subset0Mask1, row1));
|
|||
|
max1 = Sse2.Max(max1, Sse2.AndNot(subset0Mask2, row2));
|
|||
|
max1 = Sse2.Max(max1, Sse2.AndNot(subset0Mask3, row3));
|
|||
|
|
|||
|
minColors[0] = HorizontalMin(min0);
|
|||
|
minColors[1] = HorizontalMin(min1);
|
|||
|
maxColors[0] = HorizontalMax(max0);
|
|||
|
maxColors[1] = HorizontalMax(max1);
|
|||
|
}
|
|||
|
|
|||
|
private static RgbaColor8 HorizontalMin(Vector128<byte> x)
|
|||
|
{
|
|||
|
x = Sse2.Min(x, Sse2.Shuffle(x.AsInt32(), 0x31).AsByte());
|
|||
|
x = Sse2.Min(x, Sse2.Shuffle(x.AsInt32(), 2).AsByte());
|
|||
|
return RgbaColor8.FromUInt32(x.AsUInt32().GetElement(0));
|
|||
|
}
|
|||
|
|
|||
|
private static RgbaColor8 HorizontalMax(Vector128<byte> x)
|
|||
|
{
|
|||
|
x = Sse2.Max(x, Sse2.Shuffle(x.AsInt32(), 0x31).AsByte());
|
|||
|
x = Sse2.Max(x, Sse2.Shuffle(x.AsInt32(), 2).AsByte());
|
|||
|
return RgbaColor8.FromUInt32(x.AsUInt32().GetElement(0));
|
|||
|
}
|
|||
|
|
|||
|
public static int SelectIndices(
|
|||
|
ReadOnlySpan<uint> values,
|
|||
|
uint endPoint0,
|
|||
|
uint endPoint1,
|
|||
|
int pBit0,
|
|||
|
int pBit1,
|
|||
|
int indexBitCount,
|
|||
|
int indexCount,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
if (Sse41.IsSupported)
|
|||
|
{
|
|||
|
if (indexBitCount == 2)
|
|||
|
{
|
|||
|
return Select2BitIndicesSse41(
|
|||
|
values,
|
|||
|
endPoint0,
|
|||
|
endPoint1,
|
|||
|
pBit0,
|
|||
|
pBit1,
|
|||
|
indexBitCount,
|
|||
|
indexCount,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
else if (indexBitCount == 3)
|
|||
|
{
|
|||
|
return Select3BitIndicesSse41(
|
|||
|
values,
|
|||
|
endPoint0,
|
|||
|
endPoint1,
|
|||
|
pBit0,
|
|||
|
pBit1,
|
|||
|
indexBitCount,
|
|||
|
indexCount,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
else if (indexBitCount == 4)
|
|||
|
{
|
|||
|
return Select4BitIndicesOneSubsetSse41(
|
|||
|
values,
|
|||
|
endPoint0,
|
|||
|
endPoint1,
|
|||
|
pBit0,
|
|||
|
pBit1,
|
|||
|
indexBitCount,
|
|||
|
indexCount,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return SelectIndicesFallback(
|
|||
|
values,
|
|||
|
endPoint0,
|
|||
|
endPoint1,
|
|||
|
pBit0,
|
|||
|
pBit1,
|
|||
|
indexBitCount,
|
|||
|
indexCount,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe int Select2BitIndicesSse41(
|
|||
|
ReadOnlySpan<uint> values,
|
|||
|
uint endPoint0,
|
|||
|
uint endPoint1,
|
|||
|
int pBit0,
|
|||
|
int pBit1,
|
|||
|
int indexBitCount,
|
|||
|
int indexCount,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoint0), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoint1), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Vector128<byte> c0Rep = Vector128.Create(c0.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
Vector128<byte> c1Rep = Vector128.Create(c1.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
|
|||
|
Vector128<byte> c0c1 = Sse2.UnpackLow(c0Rep, c1Rep);
|
|||
|
|
|||
|
Vector128<byte> rWeights;
|
|||
|
Vector128<byte> lWeights;
|
|||
|
|
|||
|
fixed (byte* pWeights = BC67Tables.Weights[0], pInvWeights = BC67Tables.InverseWeights[0])
|
|||
|
{
|
|||
|
rWeights = Sse2.LoadScalarVector128((uint*)pWeights).AsByte();
|
|||
|
lWeights = Sse2.LoadScalarVector128((uint*)pInvWeights).AsByte();
|
|||
|
}
|
|||
|
|
|||
|
Vector128<byte> iWeights = Sse2.UnpackLow(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeights01 = Sse2.UnpackLow(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights0 = Sse2.UnpackLow(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights1 = Sse2.UnpackHigh(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
|
|||
|
Vector128<short> pal0 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights0.AsSByte()));
|
|||
|
Vector128<short> pal1 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights1.AsSByte()));
|
|||
|
|
|||
|
for (int i = 0; i < values.Length; i++)
|
|||
|
{
|
|||
|
uint c = values[i] | alphaMask;
|
|||
|
|
|||
|
Vector128<short> color = Sse41.ConvertToVector128Int16(Vector128.Create(c).AsByte());
|
|||
|
|
|||
|
Vector128<short> delta0 = Sse2.Subtract(color, pal0);
|
|||
|
Vector128<short> delta1 = Sse2.Subtract(color, pal1);
|
|||
|
|
|||
|
Vector128<int> deltaSum0 = Sse2.MultiplyAddAdjacent(delta0, delta0);
|
|||
|
Vector128<int> deltaSum1 = Sse2.MultiplyAddAdjacent(delta1, delta1);
|
|||
|
|
|||
|
Vector128<int> deltaSum01 = Ssse3.HorizontalAdd(deltaSum0, deltaSum1);
|
|||
|
|
|||
|
Vector128<ushort> delta = Sse41.PackUnsignedSaturate(deltaSum01, deltaSum01);
|
|||
|
|
|||
|
Vector128<ushort> min = Sse41.MinHorizontal(delta);
|
|||
|
|
|||
|
ushort error = min.GetElement(0);
|
|||
|
|
|||
|
errorSum += error;
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe int Select3BitIndicesSse41(
|
|||
|
ReadOnlySpan<uint> values,
|
|||
|
uint endPoint0,
|
|||
|
uint endPoint1,
|
|||
|
int pBit0,
|
|||
|
int pBit1,
|
|||
|
int indexBitCount,
|
|||
|
int indexCount,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoint0), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoint1), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Vector128<byte> c0Rep = Vector128.Create(c0.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
Vector128<byte> c1Rep = Vector128.Create(c1.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
|
|||
|
Vector128<byte> c0c1 = Sse2.UnpackLow(c0Rep, c1Rep);
|
|||
|
|
|||
|
Vector128<byte> rWeights;
|
|||
|
Vector128<byte> lWeights;
|
|||
|
|
|||
|
fixed (byte* pWeights = BC67Tables.Weights[1], pInvWeights = BC67Tables.InverseWeights[1])
|
|||
|
{
|
|||
|
rWeights = Sse2.LoadScalarVector128((ulong*)pWeights).AsByte();
|
|||
|
lWeights = Sse2.LoadScalarVector128((ulong*)pInvWeights).AsByte();
|
|||
|
}
|
|||
|
|
|||
|
Vector128<byte> iWeights = Sse2.UnpackLow(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeights01 = Sse2.UnpackLow(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights23 = Sse2.UnpackHigh(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights0 = Sse2.UnpackLow(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights1 = Sse2.UnpackHigh(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights2 = Sse2.UnpackLow(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights3 = Sse2.UnpackHigh(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
|
|||
|
Vector128<short> pal0 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights0.AsSByte()));
|
|||
|
Vector128<short> pal1 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights1.AsSByte()));
|
|||
|
Vector128<short> pal2 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights2.AsSByte()));
|
|||
|
Vector128<short> pal3 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights3.AsSByte()));
|
|||
|
|
|||
|
for (int i = 0; i < values.Length; i++)
|
|||
|
{
|
|||
|
uint c = values[i] | alphaMask;
|
|||
|
|
|||
|
Vector128<short> color = Sse41.ConvertToVector128Int16(Vector128.Create(c).AsByte());
|
|||
|
|
|||
|
Vector128<short> delta0 = Sse2.Subtract(color, pal0);
|
|||
|
Vector128<short> delta1 = Sse2.Subtract(color, pal1);
|
|||
|
Vector128<short> delta2 = Sse2.Subtract(color, pal2);
|
|||
|
Vector128<short> delta3 = Sse2.Subtract(color, pal3);
|
|||
|
|
|||
|
Vector128<int> deltaSum0 = Sse2.MultiplyAddAdjacent(delta0, delta0);
|
|||
|
Vector128<int> deltaSum1 = Sse2.MultiplyAddAdjacent(delta1, delta1);
|
|||
|
Vector128<int> deltaSum2 = Sse2.MultiplyAddAdjacent(delta2, delta2);
|
|||
|
Vector128<int> deltaSum3 = Sse2.MultiplyAddAdjacent(delta3, delta3);
|
|||
|
|
|||
|
Vector128<int> deltaSum01 = Ssse3.HorizontalAdd(deltaSum0, deltaSum1);
|
|||
|
Vector128<int> deltaSum23 = Ssse3.HorizontalAdd(deltaSum2, deltaSum3);
|
|||
|
|
|||
|
Vector128<ushort> delta = Sse41.PackUnsignedSaturate(deltaSum01, deltaSum23);
|
|||
|
|
|||
|
Vector128<ushort> min = Sse41.MinHorizontal(delta);
|
|||
|
|
|||
|
ushort error = min.GetElement(0);
|
|||
|
|
|||
|
errorSum += error;
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe int Select4BitIndicesOneSubsetSse41(
|
|||
|
ReadOnlySpan<uint> values,
|
|||
|
uint endPoint0,
|
|||
|
uint endPoint1,
|
|||
|
int pBit0,
|
|||
|
int pBit1,
|
|||
|
int indexBitCount,
|
|||
|
int indexCount,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoint0), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoint1), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Vector128<byte> c0Rep = Vector128.Create(c0.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
Vector128<byte> c1Rep = Vector128.Create(c1.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
|
|||
|
Vector128<byte> c0c1 = Sse2.UnpackLow(c0Rep, c1Rep);
|
|||
|
|
|||
|
Vector128<byte> rWeights;
|
|||
|
Vector128<byte> lWeights;
|
|||
|
|
|||
|
fixed (byte* pWeights = BC67Tables.Weights[2], pInvWeights = BC67Tables.InverseWeights[2])
|
|||
|
{
|
|||
|
rWeights = Sse2.LoadVector128(pWeights);
|
|||
|
lWeights = Sse2.LoadVector128(pInvWeights);
|
|||
|
}
|
|||
|
|
|||
|
Vector128<byte> iWeightsLow = Sse2.UnpackLow(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeightsHigh = Sse2.UnpackHigh(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeights01 = Sse2.UnpackLow(iWeightsLow.AsInt16(), iWeightsLow.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights23 = Sse2.UnpackHigh(iWeightsLow.AsInt16(), iWeightsLow.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights45 = Sse2.UnpackLow(iWeightsHigh.AsInt16(), iWeightsHigh.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights67 = Sse2.UnpackHigh(iWeightsHigh.AsInt16(), iWeightsHigh.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights0 = Sse2.UnpackLow(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights1 = Sse2.UnpackHigh(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights2 = Sse2.UnpackLow(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights3 = Sse2.UnpackHigh(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights4 = Sse2.UnpackLow(iWeights45.AsInt16(), iWeights45.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights5 = Sse2.UnpackHigh(iWeights45.AsInt16(), iWeights45.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights6 = Sse2.UnpackLow(iWeights67.AsInt16(), iWeights67.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights7 = Sse2.UnpackHigh(iWeights67.AsInt16(), iWeights67.AsInt16()).AsByte();
|
|||
|
|
|||
|
Vector128<short> pal0 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights0.AsSByte()));
|
|||
|
Vector128<short> pal1 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights1.AsSByte()));
|
|||
|
Vector128<short> pal2 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights2.AsSByte()));
|
|||
|
Vector128<short> pal3 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights3.AsSByte()));
|
|||
|
Vector128<short> pal4 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights4.AsSByte()));
|
|||
|
Vector128<short> pal5 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights5.AsSByte()));
|
|||
|
Vector128<short> pal6 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights6.AsSByte()));
|
|||
|
Vector128<short> pal7 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights7.AsSByte()));
|
|||
|
|
|||
|
for (int i = 0; i < values.Length; i++)
|
|||
|
{
|
|||
|
uint c = values[i] | alphaMask;
|
|||
|
|
|||
|
Vector128<short> color = Sse41.ConvertToVector128Int16(Vector128.Create(c).AsByte());
|
|||
|
|
|||
|
Vector128<short> delta0 = Sse2.Subtract(color, pal0);
|
|||
|
Vector128<short> delta1 = Sse2.Subtract(color, pal1);
|
|||
|
Vector128<short> delta2 = Sse2.Subtract(color, pal2);
|
|||
|
Vector128<short> delta3 = Sse2.Subtract(color, pal3);
|
|||
|
Vector128<short> delta4 = Sse2.Subtract(color, pal4);
|
|||
|
Vector128<short> delta5 = Sse2.Subtract(color, pal5);
|
|||
|
Vector128<short> delta6 = Sse2.Subtract(color, pal6);
|
|||
|
Vector128<short> delta7 = Sse2.Subtract(color, pal7);
|
|||
|
|
|||
|
Vector128<int> deltaSum0 = Sse2.MultiplyAddAdjacent(delta0, delta0);
|
|||
|
Vector128<int> deltaSum1 = Sse2.MultiplyAddAdjacent(delta1, delta1);
|
|||
|
Vector128<int> deltaSum2 = Sse2.MultiplyAddAdjacent(delta2, delta2);
|
|||
|
Vector128<int> deltaSum3 = Sse2.MultiplyAddAdjacent(delta3, delta3);
|
|||
|
Vector128<int> deltaSum4 = Sse2.MultiplyAddAdjacent(delta4, delta4);
|
|||
|
Vector128<int> deltaSum5 = Sse2.MultiplyAddAdjacent(delta5, delta5);
|
|||
|
Vector128<int> deltaSum6 = Sse2.MultiplyAddAdjacent(delta6, delta6);
|
|||
|
Vector128<int> deltaSum7 = Sse2.MultiplyAddAdjacent(delta7, delta7);
|
|||
|
|
|||
|
Vector128<int> deltaSum01 = Ssse3.HorizontalAdd(deltaSum0, deltaSum1);
|
|||
|
Vector128<int> deltaSum23 = Ssse3.HorizontalAdd(deltaSum2, deltaSum3);
|
|||
|
Vector128<int> deltaSum45 = Ssse3.HorizontalAdd(deltaSum4, deltaSum5);
|
|||
|
Vector128<int> deltaSum67 = Ssse3.HorizontalAdd(deltaSum6, deltaSum7);
|
|||
|
|
|||
|
Vector128<ushort> delta0123 = Sse41.PackUnsignedSaturate(deltaSum01, deltaSum23);
|
|||
|
Vector128<ushort> delta4567 = Sse41.PackUnsignedSaturate(deltaSum45, deltaSum67);
|
|||
|
|
|||
|
Vector128<ushort> min0123 = Sse41.MinHorizontal(delta0123);
|
|||
|
Vector128<ushort> min4567 = Sse41.MinHorizontal(delta4567);
|
|||
|
|
|||
|
ushort minPos0123 = min0123.GetElement(0);
|
|||
|
ushort minPos4567 = min4567.GetElement(0);
|
|||
|
|
|||
|
if (minPos4567 < minPos0123)
|
|||
|
{
|
|||
|
errorSum += minPos4567;
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
errorSum += minPos0123;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
private static int SelectIndicesFallback(
|
|||
|
ReadOnlySpan<uint> values,
|
|||
|
uint endPoint0,
|
|||
|
uint endPoint1,
|
|||
|
int pBit0,
|
|||
|
int pBit1,
|
|||
|
int indexBitCount,
|
|||
|
int indexCount,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
Span<uint> palette = stackalloc uint[indexCount];
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoint0), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoint1), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Unsafe.As<RgbaColor8, uint>(ref c0) |= alphaMaskForPalette;
|
|||
|
Unsafe.As<RgbaColor8, uint>(ref c1) |= alphaMaskForPalette;
|
|||
|
|
|||
|
palette[0] = c0.ToUInt32();
|
|||
|
palette[indexCount - 1] = c1.ToUInt32();
|
|||
|
|
|||
|
for (int j = 1; j < indexCount - 1; j++)
|
|||
|
{
|
|||
|
palette[j] = Interpolate(c0, c1, j, indexBitCount).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
for (int i = 0; i < values.Length; i++)
|
|||
|
{
|
|||
|
uint color = values[i] | alphaMask;
|
|||
|
|
|||
|
int bestMatchScore = int.MaxValue;
|
|||
|
int bestMatchIndex = 0;
|
|||
|
|
|||
|
for (int j = 0; j < indexCount; j++)
|
|||
|
{
|
|||
|
int score = SquaredDifference(
|
|||
|
RgbaColor8.FromUInt32(color).GetColor32(),
|
|||
|
RgbaColor8.FromUInt32(palette[j]).GetColor32());
|
|||
|
|
|||
|
if (score < bestMatchScore)
|
|||
|
{
|
|||
|
bestMatchScore = score;
|
|||
|
bestMatchIndex = j;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
errorSum += bestMatchScore;
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
public static int SelectIndices(
|
|||
|
ReadOnlySpan<uint> tile,
|
|||
|
int w,
|
|||
|
int h,
|
|||
|
ReadOnlySpan<uint> endPoints0,
|
|||
|
ReadOnlySpan<uint> endPoints1,
|
|||
|
ReadOnlySpan<int> pBitValues,
|
|||
|
Span<byte> indices,
|
|||
|
int subsetCount,
|
|||
|
int partition,
|
|||
|
int indexBitCount,
|
|||
|
int indexCount,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
int pBits,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
if (Sse41.IsSupported)
|
|||
|
{
|
|||
|
if (indexBitCount == 2)
|
|||
|
{
|
|||
|
return Select2BitIndicesSse41(
|
|||
|
tile,
|
|||
|
w,
|
|||
|
h,
|
|||
|
endPoints0,
|
|||
|
endPoints1,
|
|||
|
pBitValues,
|
|||
|
indices,
|
|||
|
subsetCount,
|
|||
|
partition,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
pBits,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
else if (indexBitCount == 3)
|
|||
|
{
|
|||
|
return Select3BitIndicesSse41(
|
|||
|
tile,
|
|||
|
w,
|
|||
|
h,
|
|||
|
endPoints0,
|
|||
|
endPoints1,
|
|||
|
pBitValues,
|
|||
|
indices,
|
|||
|
subsetCount,
|
|||
|
partition,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
pBits,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
else if (indexBitCount == 4)
|
|||
|
{
|
|||
|
Debug.Assert(subsetCount == 1);
|
|||
|
|
|||
|
return Select4BitIndicesOneSubsetSse41(
|
|||
|
tile,
|
|||
|
w,
|
|||
|
h,
|
|||
|
endPoints0[0],
|
|||
|
endPoints1[0],
|
|||
|
pBitValues,
|
|||
|
indices,
|
|||
|
partition,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
pBits,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return SelectIndicesFallback(
|
|||
|
tile,
|
|||
|
w,
|
|||
|
h,
|
|||
|
endPoints0,
|
|||
|
endPoints1,
|
|||
|
pBitValues,
|
|||
|
indices,
|
|||
|
subsetCount,
|
|||
|
partition,
|
|||
|
indexBitCount,
|
|||
|
indexCount,
|
|||
|
colorDepth,
|
|||
|
alphaDepth,
|
|||
|
pBits,
|
|||
|
alphaMask);
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe int Select2BitIndicesSse41(
|
|||
|
ReadOnlySpan<uint> tile,
|
|||
|
int w,
|
|||
|
int h,
|
|||
|
ReadOnlySpan<uint> endPoints0,
|
|||
|
ReadOnlySpan<uint> endPoints1,
|
|||
|
ReadOnlySpan<int> pBitValues,
|
|||
|
Span<byte> indices,
|
|||
|
int subsetCount,
|
|||
|
int partition,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
int pBits,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
byte[] partitionTable = BC67Tables.PartitionTable[subsetCount - 1][partition];
|
|||
|
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
for (int subset = 0; subset < subsetCount; subset++)
|
|||
|
{
|
|||
|
int pBit0 = -1, pBit1 = -1;
|
|||
|
|
|||
|
if (pBits == subsetCount)
|
|||
|
{
|
|||
|
pBit0 = pBit1 = pBitValues[subset];
|
|||
|
}
|
|||
|
else if (pBits != 0)
|
|||
|
{
|
|||
|
pBit0 = pBitValues[subset * 2];
|
|||
|
pBit1 = pBitValues[subset * 2 + 1];
|
|||
|
}
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoints0[subset]), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoints1[subset]), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Vector128<byte> c0Rep = Vector128.Create(c0.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
Vector128<byte> c1Rep = Vector128.Create(c1.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
|
|||
|
Vector128<byte> c0c1 = Sse2.UnpackLow(c0Rep, c1Rep);
|
|||
|
|
|||
|
Vector128<byte> rWeights;
|
|||
|
Vector128<byte> lWeights;
|
|||
|
|
|||
|
fixed (byte* pWeights = BC67Tables.Weights[0], pInvWeights = BC67Tables.InverseWeights[0])
|
|||
|
{
|
|||
|
rWeights = Sse2.LoadScalarVector128((uint*)pWeights).AsByte();
|
|||
|
lWeights = Sse2.LoadScalarVector128((uint*)pInvWeights).AsByte();
|
|||
|
}
|
|||
|
|
|||
|
Vector128<byte> iWeights = Sse2.UnpackLow(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeights01 = Sse2.UnpackLow(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights0 = Sse2.UnpackLow(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights1 = Sse2.UnpackHigh(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
|
|||
|
Vector128<short> pal0 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights0.AsSByte()));
|
|||
|
Vector128<short> pal1 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights1.AsSByte()));
|
|||
|
|
|||
|
int i = 0;
|
|||
|
for (int ty = 0; ty < h; ty++)
|
|||
|
{
|
|||
|
for (int tx = 0; tx < w; tx++, i++)
|
|||
|
{
|
|||
|
int tileOffset = ty * 4 + tx;
|
|||
|
if (partitionTable[tileOffset] != subset)
|
|||
|
{
|
|||
|
continue;
|
|||
|
}
|
|||
|
|
|||
|
uint c = tile[i] | alphaMask;
|
|||
|
|
|||
|
Vector128<short> color = Sse41.ConvertToVector128Int16(Vector128.Create(c).AsByte());
|
|||
|
|
|||
|
Vector128<short> delta0 = Sse2.Subtract(color, pal0);
|
|||
|
Vector128<short> delta1 = Sse2.Subtract(color, pal1);
|
|||
|
|
|||
|
Vector128<int> deltaSum0 = Sse2.MultiplyAddAdjacent(delta0, delta0);
|
|||
|
Vector128<int> deltaSum1 = Sse2.MultiplyAddAdjacent(delta1, delta1);
|
|||
|
|
|||
|
Vector128<int> deltaSum01 = Ssse3.HorizontalAdd(deltaSum0, deltaSum1);
|
|||
|
|
|||
|
Vector128<ushort> delta = Sse41.PackUnsignedSaturate(deltaSum01, deltaSum01);
|
|||
|
|
|||
|
Vector128<ushort> min = Sse41.MinHorizontal(delta);
|
|||
|
|
|||
|
uint minPos = min.AsUInt32().GetElement(0);
|
|||
|
ushort error = (ushort)minPos;
|
|||
|
uint index = minPos >> 16;
|
|||
|
|
|||
|
indices[tileOffset] = (byte)index;
|
|||
|
errorSum += error;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe int Select3BitIndicesSse41(
|
|||
|
ReadOnlySpan<uint> tile,
|
|||
|
int w,
|
|||
|
int h,
|
|||
|
ReadOnlySpan<uint> endPoints0,
|
|||
|
ReadOnlySpan<uint> endPoints1,
|
|||
|
ReadOnlySpan<int> pBitValues,
|
|||
|
Span<byte> indices,
|
|||
|
int subsetCount,
|
|||
|
int partition,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
int pBits,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
byte[] partitionTable = BC67Tables.PartitionTable[subsetCount - 1][partition];
|
|||
|
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
for (int subset = 0; subset < subsetCount; subset++)
|
|||
|
{
|
|||
|
int pBit0 = -1, pBit1 = -1;
|
|||
|
|
|||
|
if (pBits == subsetCount)
|
|||
|
{
|
|||
|
pBit0 = pBit1 = pBitValues[subset];
|
|||
|
}
|
|||
|
else if (pBits != 0)
|
|||
|
{
|
|||
|
pBit0 = pBitValues[subset * 2];
|
|||
|
pBit1 = pBitValues[subset * 2 + 1];
|
|||
|
}
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoints0[subset]), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoints1[subset]), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Vector128<byte> c0Rep = Vector128.Create(c0.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
Vector128<byte> c1Rep = Vector128.Create(c1.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
|
|||
|
Vector128<byte> c0c1 = Sse2.UnpackLow(c0Rep, c1Rep);
|
|||
|
|
|||
|
Vector128<byte> rWeights;
|
|||
|
Vector128<byte> lWeights;
|
|||
|
|
|||
|
fixed (byte* pWeights = BC67Tables.Weights[1], pInvWeights = BC67Tables.InverseWeights[1])
|
|||
|
{
|
|||
|
rWeights = Sse2.LoadScalarVector128((ulong*)pWeights).AsByte();
|
|||
|
lWeights = Sse2.LoadScalarVector128((ulong*)pInvWeights).AsByte();
|
|||
|
}
|
|||
|
|
|||
|
Vector128<byte> iWeights = Sse2.UnpackLow(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeights01 = Sse2.UnpackLow(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights23 = Sse2.UnpackHigh(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights0 = Sse2.UnpackLow(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights1 = Sse2.UnpackHigh(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights2 = Sse2.UnpackLow(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights3 = Sse2.UnpackHigh(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
|
|||
|
Vector128<short> pal0 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights0.AsSByte()));
|
|||
|
Vector128<short> pal1 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights1.AsSByte()));
|
|||
|
Vector128<short> pal2 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights2.AsSByte()));
|
|||
|
Vector128<short> pal3 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights3.AsSByte()));
|
|||
|
|
|||
|
int i = 0;
|
|||
|
for (int ty = 0; ty < h; ty++)
|
|||
|
{
|
|||
|
for (int tx = 0; tx < w; tx++, i++)
|
|||
|
{
|
|||
|
int tileOffset = ty * 4 + tx;
|
|||
|
if (partitionTable[tileOffset] != subset)
|
|||
|
{
|
|||
|
continue;
|
|||
|
}
|
|||
|
|
|||
|
uint c = tile[i] | alphaMask;
|
|||
|
|
|||
|
Vector128<short> color = Sse41.ConvertToVector128Int16(Vector128.Create(c).AsByte());
|
|||
|
|
|||
|
Vector128<short> delta0 = Sse2.Subtract(color, pal0);
|
|||
|
Vector128<short> delta1 = Sse2.Subtract(color, pal1);
|
|||
|
Vector128<short> delta2 = Sse2.Subtract(color, pal2);
|
|||
|
Vector128<short> delta3 = Sse2.Subtract(color, pal3);
|
|||
|
|
|||
|
Vector128<int> deltaSum0 = Sse2.MultiplyAddAdjacent(delta0, delta0);
|
|||
|
Vector128<int> deltaSum1 = Sse2.MultiplyAddAdjacent(delta1, delta1);
|
|||
|
Vector128<int> deltaSum2 = Sse2.MultiplyAddAdjacent(delta2, delta2);
|
|||
|
Vector128<int> deltaSum3 = Sse2.MultiplyAddAdjacent(delta3, delta3);
|
|||
|
|
|||
|
Vector128<int> deltaSum01 = Ssse3.HorizontalAdd(deltaSum0, deltaSum1);
|
|||
|
Vector128<int> deltaSum23 = Ssse3.HorizontalAdd(deltaSum2, deltaSum3);
|
|||
|
|
|||
|
Vector128<ushort> delta = Sse41.PackUnsignedSaturate(deltaSum01, deltaSum23);
|
|||
|
|
|||
|
Vector128<ushort> min = Sse41.MinHorizontal(delta);
|
|||
|
|
|||
|
uint minPos = min.AsUInt32().GetElement(0);
|
|||
|
ushort error = (ushort)minPos;
|
|||
|
uint index = minPos >> 16;
|
|||
|
|
|||
|
indices[tileOffset] = (byte)index;
|
|||
|
errorSum += error;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
private static unsafe int Select4BitIndicesOneSubsetSse41(
|
|||
|
ReadOnlySpan<uint> tile,
|
|||
|
int w,
|
|||
|
int h,
|
|||
|
uint endPoint0,
|
|||
|
uint endPoint1,
|
|||
|
ReadOnlySpan<int> pBitValues,
|
|||
|
Span<byte> indices,
|
|||
|
int partition,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
int pBits,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
int pBit0 = -1, pBit1 = -1;
|
|||
|
|
|||
|
if (pBits != 0)
|
|||
|
{
|
|||
|
pBit0 = pBitValues[0];
|
|||
|
pBit1 = pBitValues[1];
|
|||
|
}
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoint0), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoint1), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Vector128<byte> c0Rep = Vector128.Create(c0.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
Vector128<byte> c1Rep = Vector128.Create(c1.ToUInt32() | alphaMaskForPalette).AsByte();
|
|||
|
|
|||
|
Vector128<byte> c0c1 = Sse2.UnpackLow(c0Rep, c1Rep);
|
|||
|
|
|||
|
Vector128<byte> rWeights;
|
|||
|
Vector128<byte> lWeights;
|
|||
|
|
|||
|
fixed (byte* pWeights = BC67Tables.Weights[2], pInvWeights = BC67Tables.InverseWeights[2])
|
|||
|
{
|
|||
|
rWeights = Sse2.LoadVector128(pWeights);
|
|||
|
lWeights = Sse2.LoadVector128(pInvWeights);
|
|||
|
}
|
|||
|
|
|||
|
Vector128<byte> iWeightsLow = Sse2.UnpackLow(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeightsHigh = Sse2.UnpackHigh(lWeights, rWeights);
|
|||
|
Vector128<byte> iWeights01 = Sse2.UnpackLow(iWeightsLow.AsInt16(), iWeightsLow.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights23 = Sse2.UnpackHigh(iWeightsLow.AsInt16(), iWeightsLow.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights45 = Sse2.UnpackLow(iWeightsHigh.AsInt16(), iWeightsHigh.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights67 = Sse2.UnpackHigh(iWeightsHigh.AsInt16(), iWeightsHigh.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights0 = Sse2.UnpackLow(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights1 = Sse2.UnpackHigh(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights2 = Sse2.UnpackLow(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights3 = Sse2.UnpackHigh(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights4 = Sse2.UnpackLow(iWeights45.AsInt16(), iWeights45.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights5 = Sse2.UnpackHigh(iWeights45.AsInt16(), iWeights45.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights6 = Sse2.UnpackLow(iWeights67.AsInt16(), iWeights67.AsInt16()).AsByte();
|
|||
|
Vector128<byte> iWeights7 = Sse2.UnpackHigh(iWeights67.AsInt16(), iWeights67.AsInt16()).AsByte();
|
|||
|
|
|||
|
Vector128<short> pal0 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights0.AsSByte()));
|
|||
|
Vector128<short> pal1 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights1.AsSByte()));
|
|||
|
Vector128<short> pal2 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights2.AsSByte()));
|
|||
|
Vector128<short> pal3 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights3.AsSByte()));
|
|||
|
Vector128<short> pal4 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights4.AsSByte()));
|
|||
|
Vector128<short> pal5 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights5.AsSByte()));
|
|||
|
Vector128<short> pal6 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights6.AsSByte()));
|
|||
|
Vector128<short> pal7 = ShiftRoundToNearest(Ssse3.MultiplyAddAdjacent(c0c1, iWeights7.AsSByte()));
|
|||
|
|
|||
|
int i = 0;
|
|||
|
for (int ty = 0; ty < h; ty++)
|
|||
|
{
|
|||
|
for (int tx = 0; tx < w; tx++, i++)
|
|||
|
{
|
|||
|
uint c = tile[i] | alphaMask;
|
|||
|
|
|||
|
Vector128<short> color = Sse41.ConvertToVector128Int16(Vector128.Create(c).AsByte());
|
|||
|
|
|||
|
Vector128<short> delta0 = Sse2.Subtract(color, pal0);
|
|||
|
Vector128<short> delta1 = Sse2.Subtract(color, pal1);
|
|||
|
Vector128<short> delta2 = Sse2.Subtract(color, pal2);
|
|||
|
Vector128<short> delta3 = Sse2.Subtract(color, pal3);
|
|||
|
Vector128<short> delta4 = Sse2.Subtract(color, pal4);
|
|||
|
Vector128<short> delta5 = Sse2.Subtract(color, pal5);
|
|||
|
Vector128<short> delta6 = Sse2.Subtract(color, pal6);
|
|||
|
Vector128<short> delta7 = Sse2.Subtract(color, pal7);
|
|||
|
|
|||
|
Vector128<int> deltaSum0 = Sse2.MultiplyAddAdjacent(delta0, delta0);
|
|||
|
Vector128<int> deltaSum1 = Sse2.MultiplyAddAdjacent(delta1, delta1);
|
|||
|
Vector128<int> deltaSum2 = Sse2.MultiplyAddAdjacent(delta2, delta2);
|
|||
|
Vector128<int> deltaSum3 = Sse2.MultiplyAddAdjacent(delta3, delta3);
|
|||
|
Vector128<int> deltaSum4 = Sse2.MultiplyAddAdjacent(delta4, delta4);
|
|||
|
Vector128<int> deltaSum5 = Sse2.MultiplyAddAdjacent(delta5, delta5);
|
|||
|
Vector128<int> deltaSum6 = Sse2.MultiplyAddAdjacent(delta6, delta6);
|
|||
|
Vector128<int> deltaSum7 = Sse2.MultiplyAddAdjacent(delta7, delta7);
|
|||
|
|
|||
|
Vector128<int> deltaSum01 = Ssse3.HorizontalAdd(deltaSum0, deltaSum1);
|
|||
|
Vector128<int> deltaSum23 = Ssse3.HorizontalAdd(deltaSum2, deltaSum3);
|
|||
|
Vector128<int> deltaSum45 = Ssse3.HorizontalAdd(deltaSum4, deltaSum5);
|
|||
|
Vector128<int> deltaSum67 = Ssse3.HorizontalAdd(deltaSum6, deltaSum7);
|
|||
|
|
|||
|
Vector128<ushort> delta0123 = Sse41.PackUnsignedSaturate(deltaSum01, deltaSum23);
|
|||
|
Vector128<ushort> delta4567 = Sse41.PackUnsignedSaturate(deltaSum45, deltaSum67);
|
|||
|
|
|||
|
Vector128<ushort> min0123 = Sse41.MinHorizontal(delta0123);
|
|||
|
Vector128<ushort> min4567 = Sse41.MinHorizontal(delta4567);
|
|||
|
|
|||
|
uint minPos0123 = min0123.AsUInt32().GetElement(0);
|
|||
|
uint minPos4567 = min4567.AsUInt32().GetElement(0);
|
|||
|
|
|||
|
if ((ushort)minPos4567 < (ushort)minPos0123)
|
|||
|
{
|
|||
|
errorSum += (ushort)minPos4567;
|
|||
|
indices[ty * 4 + tx] = (byte)(8 + (minPos4567 >> 16));
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
errorSum += (ushort)minPos0123;
|
|||
|
indices[ty * 4 + tx] = (byte)(minPos0123 >> 16);
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
private static Vector128<short> ShiftRoundToNearest(Vector128<short> x)
|
|||
|
{
|
|||
|
return Sse2.ShiftRightLogical(Sse2.Add(x, Vector128.Create((short)32)), 6);
|
|||
|
}
|
|||
|
|
|||
|
private static int SelectIndicesFallback(
|
|||
|
ReadOnlySpan<uint> tile,
|
|||
|
int w,
|
|||
|
int h,
|
|||
|
ReadOnlySpan<uint> endPoints0,
|
|||
|
ReadOnlySpan<uint> endPoints1,
|
|||
|
ReadOnlySpan<int> pBitValues,
|
|||
|
Span<byte> indices,
|
|||
|
int subsetCount,
|
|||
|
int partition,
|
|||
|
int indexBitCount,
|
|||
|
int indexCount,
|
|||
|
int colorDepth,
|
|||
|
int alphaDepth,
|
|||
|
int pBits,
|
|||
|
uint alphaMask)
|
|||
|
{
|
|||
|
int errorSum = 0;
|
|||
|
|
|||
|
uint alphaMaskForPalette = alphaMask;
|
|||
|
|
|||
|
if (alphaDepth == 0)
|
|||
|
{
|
|||
|
alphaMaskForPalette |= new RgbaColor8(0, 0, 0, 255).ToUInt32();
|
|||
|
}
|
|||
|
|
|||
|
Span<uint> palette = stackalloc uint[subsetCount * indexCount];
|
|||
|
|
|||
|
for (int subset = 0; subset < subsetCount; subset++)
|
|||
|
{
|
|||
|
int palBase = subset * indexCount;
|
|||
|
|
|||
|
int pBit0 = -1, pBit1 = -1;
|
|||
|
|
|||
|
if (pBits == subsetCount)
|
|||
|
{
|
|||
|
pBit0 = pBit1 = pBitValues[subset];
|
|||
|
}
|
|||
|
else if (pBits != 0)
|
|||
|
{
|
|||
|
pBit0 = pBitValues[subset * 2];
|
|||
|
pBit1 = pBitValues[subset * 2 + 1];
|
|||
|
}
|
|||
|
|
|||
|
RgbaColor8 c0 = Quantize(RgbaColor8.FromUInt32(endPoints0[subset]), colorDepth, alphaDepth, pBit0);
|
|||
|
RgbaColor8 c1 = Quantize(RgbaColor8.FromUInt32(endPoints1[subset]), colorDepth, alphaDepth, pBit1);
|
|||
|
|
|||
|
Unsafe.As<RgbaColor8, uint>(ref c0) |= alphaMaskForPalette;
|
|||
|
Unsafe.As<RgbaColor8, uint>(ref c1) |= alphaMaskForPalette;
|
|||
|
|
|||
|
palette[palBase + 0] = c0.ToUInt32();
|
|||
|
palette[palBase + indexCount - 1] = c1.ToUInt32();
|
|||
|
|
|||
|
for (int j = 1; j < indexCount - 1; j++)
|
|||
|
{
|
|||
|
palette[palBase + j] = Interpolate(c0, c1, j, indexBitCount).ToUInt32();
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
int i = 0;
|
|||
|
for (int ty = 0; ty < h; ty++)
|
|||
|
{
|
|||
|
for (int tx = 0; tx < w; tx++)
|
|||
|
{
|
|||
|
int subset = BC67Tables.PartitionTable[subsetCount - 1][partition][ty * 4 + tx];
|
|||
|
uint color = tile[i++] | alphaMask;
|
|||
|
|
|||
|
int bestMatchScore = int.MaxValue;
|
|||
|
int bestMatchIndex = 0;
|
|||
|
|
|||
|
for (int j = 0; j < indexCount; j++)
|
|||
|
{
|
|||
|
int score = SquaredDifference(
|
|||
|
RgbaColor8.FromUInt32(color).GetColor32(),
|
|||
|
RgbaColor8.FromUInt32(palette[subset * indexCount + j]).GetColor32());
|
|||
|
|
|||
|
if (score < bestMatchScore)
|
|||
|
{
|
|||
|
bestMatchScore = score;
|
|||
|
bestMatchIndex = j;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
indices[ty * 4 + tx] = (byte)bestMatchIndex;
|
|||
|
errorSum += bestMatchScore;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return errorSum;
|
|||
|
}
|
|||
|
|
|||
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|||
|
public static int SquaredDifference(RgbaColor32 color1, RgbaColor32 color2)
|
|||
|
{
|
|||
|
RgbaColor32 delta = color1 - color2;
|
|||
|
return RgbaColor32.Dot(delta, delta);
|
|||
|
}
|
|||
|
|
|||
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|||
|
public static RgbaColor8 Interpolate(RgbaColor8 color1, RgbaColor8 color2, int weightIndex, int indexBitCount)
|
|||
|
{
|
|||
|
return Interpolate(color1.GetColor32(), color2.GetColor32(), weightIndex, indexBitCount).GetColor8();
|
|||
|
}
|
|||
|
|
|||
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|||
|
public static RgbaColor32 Interpolate(RgbaColor32 color1, RgbaColor32 color2, int weightIndex, int indexBitCount)
|
|||
|
{
|
|||
|
Debug.Assert(indexBitCount >= 2 && indexBitCount <= 4);
|
|||
|
|
|||
|
int weight = (((weightIndex << 7) / ((1 << indexBitCount) - 1)) + 1) >> 1;
|
|||
|
|
|||
|
RgbaColor32 weightV = new RgbaColor32(weight);
|
|||
|
RgbaColor32 invWeightV = new RgbaColor32(64 - weight);
|
|||
|
|
|||
|
return (color1 * invWeightV + color2 * weightV + new RgbaColor32(32)) >> 6;
|
|||
|
}
|
|||
|
|
|||
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|||
|
public static RgbaColor32 Interpolate(
|
|||
|
RgbaColor32 color1,
|
|||
|
RgbaColor32 color2,
|
|||
|
int colorWeightIndex,
|
|||
|
int alphaWeightIndex,
|
|||
|
int colorIndexBitCount,
|
|||
|
int alphaIndexBitCount)
|
|||
|
{
|
|||
|
Debug.Assert(colorIndexBitCount >= 2 && colorIndexBitCount <= 4);
|
|||
|
Debug.Assert(alphaIndexBitCount >= 2 && alphaIndexBitCount <= 4);
|
|||
|
|
|||
|
int colorWeight = BC67Tables.Weights[colorIndexBitCount - 2][colorWeightIndex];
|
|||
|
int alphaWeight = BC67Tables.Weights[alphaIndexBitCount - 2][alphaWeightIndex];
|
|||
|
|
|||
|
RgbaColor32 weightV = new RgbaColor32(colorWeight);
|
|||
|
weightV.A = alphaWeight;
|
|||
|
RgbaColor32 invWeightV = new RgbaColor32(64) - weightV;
|
|||
|
|
|||
|
return (color1 * invWeightV + color2 * weightV + new RgbaColor32(32)) >> 6;
|
|||
|
}
|
|||
|
|
|||
|
public static RgbaColor8 Quantize(RgbaColor8 color, int colorBits, int alphaBits, int pBit = -1)
|
|||
|
{
|
|||
|
if (alphaBits == 0)
|
|||
|
{
|
|||
|
int colorShift = 8 - colorBits;
|
|||
|
|
|||
|
uint c;
|
|||
|
|
|||
|
if (pBit >= 0)
|
|||
|
{
|
|||
|
byte[] lutColor = _quantizationLut[colorBits - 4];
|
|||
|
|
|||
|
Debug.Assert(pBit <= 1);
|
|||
|
int high = pBit << 8;
|
|||
|
uint mask = (0xffu >> (colorBits + 1)) * 0x10101;
|
|||
|
|
|||
|
c = lutColor[color.R | high];
|
|||
|
c |= (uint)lutColor[color.G | high] << 8;
|
|||
|
c |= (uint)lutColor[color.B | high] << 16;
|
|||
|
|
|||
|
c <<= colorShift;
|
|||
|
c |= (c >> (colorBits + 1)) & mask;
|
|||
|
c |= ((uint)pBit * 0x10101) << (colorShift - 1);
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
byte[] lutColor = _quantizationLutNoPBit[colorBits - 4];
|
|||
|
|
|||
|
uint mask = (0xffu >> colorBits) * 0x10101;
|
|||
|
|
|||
|
c = lutColor[color.R];
|
|||
|
c |= (uint)lutColor[color.G] << 8;
|
|||
|
c |= (uint)lutColor[color.B] << 16;
|
|||
|
|
|||
|
c <<= colorShift;
|
|||
|
c |= (c >> colorBits) & mask;
|
|||
|
}
|
|||
|
|
|||
|
c |= (uint)color.A << 24;
|
|||
|
|
|||
|
return RgbaColor8.FromUInt32(c);
|
|||
|
}
|
|||
|
|
|||
|
return QuantizeFallback(color, colorBits, alphaBits, pBit);
|
|||
|
}
|
|||
|
|
|||
|
private static RgbaColor8 QuantizeFallback(RgbaColor8 color, int colorBits, int alphaBits, int pBit = -1)
|
|||
|
{
|
|||
|
byte r = UnquantizeComponent(QuantizeComponent(color.R, colorBits, pBit), colorBits, pBit);
|
|||
|
byte g = UnquantizeComponent(QuantizeComponent(color.G, colorBits, pBit), colorBits, pBit);
|
|||
|
byte b = UnquantizeComponent(QuantizeComponent(color.B, colorBits, pBit), colorBits, pBit);
|
|||
|
byte a = alphaBits == 0 ? color.A : UnquantizeComponent(QuantizeComponent(color.A, alphaBits, pBit), alphaBits, pBit);
|
|||
|
return new RgbaColor8(r, g, b, a);
|
|||
|
}
|
|||
|
|
|||
|
public static byte QuantizeComponent(byte component, int bits, int pBit = -1)
|
|||
|
{
|
|||
|
return pBit >= 0 ? _quantizationLut[bits - 4][component | (pBit << 8)] : _quantizationLutNoPBit[bits - 4][component];
|
|||
|
}
|
|||
|
|
|||
|
private static byte QuantizeComponentForLut(byte component, int bits, int pBit = -1)
|
|||
|
{
|
|||
|
int shift = 8 - bits;
|
|||
|
int fill = component >> bits;
|
|||
|
|
|||
|
if (pBit >= 0)
|
|||
|
{
|
|||
|
Debug.Assert(pBit <= 1);
|
|||
|
fill >>= 1;
|
|||
|
fill |= pBit << (shift - 1);
|
|||
|
}
|
|||
|
|
|||
|
int q1 = component >> shift;
|
|||
|
int q2 = Math.Max(q1 - 1, 0);
|
|||
|
int q3 = Math.Min(q1 + 1, (1 << bits) - 1);
|
|||
|
|
|||
|
int delta1 = FastAbs(((q1 << shift) | fill) - component);
|
|||
|
int delta2 = component - ((q2 << shift) | fill);
|
|||
|
int delta3 = ((q3 << shift) | fill) - component;
|
|||
|
|
|||
|
if (delta1 < delta2 && delta1 < delta3)
|
|||
|
{
|
|||
|
return (byte)q1;
|
|||
|
}
|
|||
|
else if (delta2 < delta3)
|
|||
|
{
|
|||
|
return (byte)q2;
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
return (byte)q3;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|||
|
private static int FastAbs(int x)
|
|||
|
{
|
|||
|
int sign = x >> 31;
|
|||
|
return (x + sign) ^ sign;
|
|||
|
}
|
|||
|
|
|||
|
private static byte UnquantizeComponent(byte component, int bits, int pBit)
|
|||
|
{
|
|||
|
int shift = 8 - bits;
|
|||
|
int value = component << shift;
|
|||
|
|
|||
|
if (pBit >= 0)
|
|||
|
{
|
|||
|
Debug.Assert(pBit <= 1);
|
|||
|
value |= value >> (bits + 1);
|
|||
|
value |= pBit << (shift - 1);
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
value |= value >> bits;
|
|||
|
}
|
|||
|
|
|||
|
return (byte)value;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|