819 lines
32 KiB
C#
819 lines
32 KiB
C#
using Ryujinx.Graphics.Texture.Utils;
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using System;
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using System.Runtime.InteropServices;
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namespace Ryujinx.Graphics.Texture
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{
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static class BC6Decoder
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{
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private const int HalfOne = 0x3C00;
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public static void Decode(Span<byte> output, ReadOnlySpan<byte> data, int width, int height, bool signed)
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{
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ReadOnlySpan<Block> blocks = MemoryMarshal.Cast<byte, Block>(data);
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Span<ulong> output64 = MemoryMarshal.Cast<byte, ulong>(output);
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int wInBlocks = (width + 3) / 4;
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int hInBlocks = (height + 3) / 4;
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for (int y = 0; y < hInBlocks; y++)
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{
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int y2 = y * 4;
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int bh = Math.Min(4, height - y2);
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for (int x = 0; x < wInBlocks; x++)
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{
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int x2 = x * 4;
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int bw = Math.Min(4, width - x2);
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DecodeBlock(blocks[y * wInBlocks + x], output64[(y2 * width + x2)..], bw, bh, width, signed);
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}
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}
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}
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private static void DecodeBlock(Block block, Span<ulong> output, int w, int h, int width, bool signed)
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{
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int mode = (int)(block.Low & 3);
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if ((mode & 2) != 0)
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{
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mode = (int)(block.Low & 0x1f);
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}
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Span<RgbaColor32> endPoints = stackalloc RgbaColor32[4];
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int subsetCount = DecodeEndPoints(ref block, endPoints, mode, signed);
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if (subsetCount == 0)
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{
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// Mode is invalid, the spec mandates that hardware fills the block with
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// a opaque black color.
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for (int ty = 0; ty < h; ty++)
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{
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int baseOffs = ty * width;
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for (int tx = 0; tx < w; tx++)
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{
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output[baseOffs + tx] = (ulong)HalfOne << 48;
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}
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}
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return;
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}
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int partition;
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int indexBitCount;
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ulong indices;
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if (subsetCount > 1)
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{
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partition = (int)((block.High >> 13) & 0x1F);
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indexBitCount = 3;
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int fixUpIndex = BC67Tables.FixUpIndices[subsetCount - 1][partition][1] * 3;
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ulong lowMask = (ulong.MaxValue >> (65 - fixUpIndex)) << 3;
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ulong highMask = ulong.MaxValue << (fixUpIndex + 3);
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indices = ((block.High >> 16) & highMask) | ((block.High >> 17) & lowMask) | ((block.High >> 18) & 3);
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}
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else
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{
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partition = 0;
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indexBitCount = 4;
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indices = (block.High & ~0xFUL) | ((block.High >> 1) & 7);
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}
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ulong indexMask = (1UL << indexBitCount) - 1;
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for (int ty = 0; ty < h; ty++)
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{
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int baseOffs = ty * width;
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for (int tx = 0; tx < w; tx++)
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{
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int offs = baseOffs + tx;
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int index = (int)(indices & indexMask);
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int endPointBase = BC67Tables.PartitionTable[subsetCount - 1][partition][ty * 4 + tx] << 1;
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RgbaColor32 color1 = endPoints[endPointBase];
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RgbaColor32 color2 = endPoints[endPointBase + 1];
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RgbaColor32 color = BC67Utils.Interpolate(color1, color2, index, indexBitCount);
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output[offs] =
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(ulong)FinishUnquantize(color.R, signed) |
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((ulong)FinishUnquantize(color.G, signed) << 16) |
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((ulong)FinishUnquantize(color.B, signed) << 32) |
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((ulong)HalfOne << 48);
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indices >>= indexBitCount;
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}
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}
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}
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private static int DecodeEndPoints(ref Block block, Span<RgbaColor32> endPoints, int mode, bool signed)
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{
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ulong low = block.Low;
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ulong high = block.High;
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int r0 = 0, g0 = 0, b0 = 0, r1 = 0, g1 = 0, b1 = 0, r2 = 0, g2 = 0, b2 = 0, r3 = 0, g3 = 0, b3 = 0;
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int subsetCount;
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switch (mode)
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{
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case 0:
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r0 = (int)(low >> 5) & 0x3FF;
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g0 = (int)(low >> 15) & 0x3FF;
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b0 = (int)(low >> 25) & 0x3FF;
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if (signed)
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{
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r0 = SignExtend(r0, 10);
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g0 = SignExtend(g0, 10);
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b0 = SignExtend(b0, 10);
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}
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r1 = r0 + SignExtend((int)(low >> 35), 5);
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g1 = g0 + SignExtend((int)(low >> 45), 5);
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b1 = b0 + SignExtend((int)(low >> 55), 5);
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r2 = r0 + SignExtend((int)(high >> 1), 5);
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g2 = g0 + SignExtend((int)(((low << 2) & 0x10) | ((low >> 41) & 0xF)), 5);
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b2 = b0 + SignExtend((int)(((low << 1) & 0x10) | ((high << 3) & 0x08) | (low >> 61)), 5);
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r3 = r0 + SignExtend((int)(high >> 7), 5);
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g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0xF)), 5);
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b3 = b0 + SignExtend((int)(
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((low) & 0x10) |
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((high >> 9) & 0x08) |
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((high >> 4) & 0x04) |
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((low >> 59) & 0x02) |
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((low >> 50) & 0x01)), 5);
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r0 = Unquantize(r0, 10, signed);
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g0 = Unquantize(g0, 10, signed);
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b0 = Unquantize(b0, 10, signed);
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r1 = Unquantize(r1 & 0x3FF, 10, signed);
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g1 = Unquantize(g1 & 0x3FF, 10, signed);
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b1 = Unquantize(b1 & 0x3FF, 10, signed);
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r2 = Unquantize(r2 & 0x3FF, 10, signed);
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g2 = Unquantize(g2 & 0x3FF, 10, signed);
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b2 = Unquantize(b2 & 0x3FF, 10, signed);
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r3 = Unquantize(r3 & 0x3FF, 10, signed);
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g3 = Unquantize(g3 & 0x3FF, 10, signed);
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b3 = Unquantize(b3 & 0x3FF, 10, signed);
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subsetCount = 2;
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break;
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case 1:
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r0 = (int)(low >> 5) & 0x7F;
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g0 = (int)(low >> 15) & 0x7F;
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b0 = (int)(low >> 25) & 0x7F;
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if (signed)
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{
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r0 = SignExtend(r0, 7);
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g0 = SignExtend(g0, 7);
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b0 = SignExtend(b0, 7);
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}
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r1 = r0 + SignExtend((int)(low >> 35), 6);
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g1 = g0 + SignExtend((int)(low >> 45), 6);
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b1 = b0 + SignExtend((int)(low >> 55), 6);
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r2 = r0 + SignExtend((int)(high >> 1), 6);
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g2 = g0 + SignExtend((int)(((low << 3) & 0x20) | ((low >> 20) & 0x10) | ((low >> 41) & 0x0F)), 6);
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b2 = b0 + SignExtend((int)(
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((low >> 17) & 0x20) |
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((low >> 10) & 0x10) |
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((high << 3) & 0x08) |
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(low >> 61)), 6);
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r3 = r0 + SignExtend((int)(high >> 7), 6);
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g3 = g0 + SignExtend((int)(((low << 1) & 0x30) | ((low >> 51) & 0xF)), 6);
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b3 = b0 + SignExtend((int)(
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((low >> 28) & 0x20) |
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((low >> 30) & 0x10) |
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((low >> 29) & 0x08) |
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((low >> 21) & 0x04) |
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((low >> 12) & 0x03)), 6);
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r0 = Unquantize(r0, 7, signed);
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g0 = Unquantize(g0, 7, signed);
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b0 = Unquantize(b0, 7, signed);
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r1 = Unquantize(r1 & 0x7F, 7, signed);
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g1 = Unquantize(g1 & 0x7F, 7, signed);
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b1 = Unquantize(b1 & 0x7F, 7, signed);
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r2 = Unquantize(r2 & 0x7F, 7, signed);
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g2 = Unquantize(g2 & 0x7F, 7, signed);
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b2 = Unquantize(b2 & 0x7F, 7, signed);
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r3 = Unquantize(r3 & 0x7F, 7, signed);
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g3 = Unquantize(g3 & 0x7F, 7, signed);
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b3 = Unquantize(b3 & 0x7F, 7, signed);
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subsetCount = 2;
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break;
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case 2:
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r0 = (int)(((low >> 30) & 0x400) | ((low >> 5) & 0x3FF));
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g0 = (int)(((low >> 39) & 0x400) | ((low >> 15) & 0x3FF));
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b0 = (int)(((low >> 49) & 0x400) | ((low >> 25) & 0x3FF));
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if (signed)
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{
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r0 = SignExtend(r0, 11);
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g0 = SignExtend(g0, 11);
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b0 = SignExtend(b0, 11);
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}
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r1 = r0 + SignExtend((int)(low >> 35), 5);
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g1 = g0 + SignExtend((int)(low >> 45), 4);
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b1 = b0 + SignExtend((int)(low >> 55), 4);
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r2 = r0 + SignExtend((int)(high >> 1), 5);
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g2 = g0 + SignExtend((int)(low >> 41), 4);
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b2 = b0 + SignExtend((int)(((high << 3) & 8) | (low >> 61)), 4);
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r3 = r0 + SignExtend((int)(high >> 7), 5);
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g3 = g0 + SignExtend((int)(low >> 51), 4);
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b3 = b0 + SignExtend((int)(
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((high >> 9) & 8) |
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((high >> 4) & 4) |
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((low >> 59) & 2) |
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((low >> 50) & 1)), 4);
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r0 = Unquantize(r0, 11, signed);
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g0 = Unquantize(g0, 11, signed);
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b0 = Unquantize(b0, 11, signed);
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r1 = Unquantize(r1 & 0x7FF, 11, signed);
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g1 = Unquantize(g1 & 0x7FF, 11, signed);
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b1 = Unquantize(b1 & 0x7FF, 11, signed);
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r2 = Unquantize(r2 & 0x7FF, 11, signed);
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g2 = Unquantize(g2 & 0x7FF, 11, signed);
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b2 = Unquantize(b2 & 0x7FF, 11, signed);
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r3 = Unquantize(r3 & 0x7FF, 11, signed);
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g3 = Unquantize(g3 & 0x7FF, 11, signed);
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b3 = Unquantize(b3 & 0x7FF, 11, signed);
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subsetCount = 2;
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break;
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case 3:
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r0 = (int)(low >> 5) & 0x3FF;
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g0 = (int)(low >> 15) & 0x3FF;
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b0 = (int)(low >> 25) & 0x3FF;
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r1 = (int)(low >> 35) & 0x3FF;
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g1 = (int)(low >> 45) & 0x3FF;
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b1 = (int)(((high << 9) & 0x200) | (low >> 55));
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if (signed)
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{
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r0 = SignExtend(r0, 10);
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g0 = SignExtend(g0, 10);
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b0 = SignExtend(b0, 10);
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r1 = SignExtend(r1, 10);
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g1 = SignExtend(g1, 10);
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b1 = SignExtend(b1, 10);
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}
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r0 = Unquantize(r0, 10, signed);
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g0 = Unquantize(g0, 10, signed);
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b0 = Unquantize(b0, 10, signed);
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r1 = Unquantize(r1, 10, signed);
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g1 = Unquantize(g1, 10, signed);
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b1 = Unquantize(b1, 10, signed);
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subsetCount = 1;
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break;
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case 6:
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r0 = (int)(((low >> 29) & 0x400) | ((low >> 5) & 0x3FF));
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g0 = (int)(((low >> 40) & 0x400) | ((low >> 15) & 0x3FF));
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b0 = (int)(((low >> 49) & 0x400) | ((low >> 25) & 0x3FF));
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if (signed)
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{
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r0 = SignExtend(r0, 11);
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g0 = SignExtend(g0, 11);
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b0 = SignExtend(b0, 11);
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}
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r1 = r0 + SignExtend((int)(low >> 35), 4);
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g1 = g0 + SignExtend((int)(low >> 45), 5);
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b1 = b0 + SignExtend((int)(low >> 55), 4);
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r2 = r0 + SignExtend((int)(high >> 1), 4);
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g2 = g0 + SignExtend((int)(((high >> 7) & 0x10) | ((low >> 41) & 0x0F)), 5);
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b2 = b0 + SignExtend((int)(((high << 3) & 0x08) | ((low >> 61))), 4);
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r3 = r0 + SignExtend((int)(high >> 7), 4);
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g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0x0F)), 5);
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b3 = b0 + SignExtend((int)(
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((high >> 9) & 8) |
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((high >> 4) & 4) |
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((low >> 59) & 2) |
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((high >> 5) & 1)), 4);
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r0 = Unquantize(r0, 11, signed);
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g0 = Unquantize(g0, 11, signed);
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b0 = Unquantize(b0, 11, signed);
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r1 = Unquantize(r1 & 0x7FF, 11, signed);
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g1 = Unquantize(g1 & 0x7FF, 11, signed);
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b1 = Unquantize(b1 & 0x7FF, 11, signed);
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r2 = Unquantize(r2 & 0x7FF, 11, signed);
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g2 = Unquantize(g2 & 0x7FF, 11, signed);
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b2 = Unquantize(b2 & 0x7FF, 11, signed);
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r3 = Unquantize(r3 & 0x7FF, 11, signed);
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g3 = Unquantize(g3 & 0x7FF, 11, signed);
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b3 = Unquantize(b3 & 0x7FF, 11, signed);
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subsetCount = 2;
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break;
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case 7:
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r0 = (int)(((low >> 34) & 0x400) | ((low >> 5) & 0x3FF));
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g0 = (int)(((low >> 44) & 0x400) | ((low >> 15) & 0x3FF));
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b0 = (int)(((high << 10) & 0x400) | ((low >> 25) & 0x3FF));
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if (signed)
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{
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r0 = SignExtend(r0, 11);
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g0 = SignExtend(g0, 11);
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b0 = SignExtend(b0, 11);
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}
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r1 = (r0 + SignExtend((int)(low >> 35), 9)) & 0x7FF;
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g1 = (g0 + SignExtend((int)(low >> 45), 9)) & 0x7FF;
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b1 = (b0 + SignExtend((int)(low >> 55), 9)) & 0x7FF;
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r0 = Unquantize(r0, 11, signed);
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g0 = Unquantize(g0, 11, signed);
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b0 = Unquantize(b0, 11, signed);
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r1 = Unquantize(r1, 11, signed);
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g1 = Unquantize(g1, 11, signed);
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b1 = Unquantize(b1, 11, signed);
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subsetCount = 1;
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break;
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case 10:
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r0 = (int)(((low >> 29) & 0x400) | ((low >> 5) & 0x3FF));
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g0 = (int)(((low >> 39) & 0x400) | ((low >> 15) & 0x3FF));
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b0 = (int)(((low >> 50) & 0x400) | ((low >> 25) & 0x3FF));
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if (signed)
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{
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r0 = SignExtend(r0, 11);
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g0 = SignExtend(g0, 11);
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b0 = SignExtend(b0, 11);
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}
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r1 = r0 + SignExtend((int)(low >> 35), 4);
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g1 = g0 + SignExtend((int)(low >> 45), 4);
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b1 = b0 + SignExtend((int)(low >> 55), 5);
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r2 = r0 + SignExtend((int)(high >> 1), 4);
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g2 = g0 + SignExtend((int)(low >> 41), 4);
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b2 = b0 + SignExtend((int)(((low >> 36) & 0x10) | ((high << 3) & 8) | (low >> 61)), 5);
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r3 = r0 + SignExtend((int)(high >> 7), 4);
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g3 = g0 + SignExtend((int)(low >> 51), 4);
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b3 = b0 + SignExtend((int)(
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((high >> 7) & 0x10) |
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((high >> 9) & 0x08) |
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((high >> 4) & 0x06) |
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((low >> 50) & 0x01)), 5);
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r0 = Unquantize(r0, 11, signed);
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g0 = Unquantize(g0, 11, signed);
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b0 = Unquantize(b0, 11, signed);
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r1 = Unquantize(r1 & 0x7FF, 11, signed);
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g1 = Unquantize(g1 & 0x7FF, 11, signed);
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b1 = Unquantize(b1 & 0x7FF, 11, signed);
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r2 = Unquantize(r2 & 0x7FF, 11, signed);
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g2 = Unquantize(g2 & 0x7FF, 11, signed);
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b2 = Unquantize(b2 & 0x7FF, 11, signed);
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r3 = Unquantize(r3 & 0x7FF, 11, signed);
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g3 = Unquantize(g3 & 0x7FF, 11, signed);
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b3 = Unquantize(b3 & 0x7FF, 11, signed);
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subsetCount = 2;
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break;
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case 11:
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r0 = (int)(((low >> 32) & 0x800) | ((low >> 34) & 0x400) | ((low >> 5) & 0x3FF));
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g0 = (int)(((low >> 42) & 0x800) | ((low >> 44) & 0x400) | ((low >> 15) & 0x3FF));
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b0 = (int)(((low >> 52) & 0x800) | ((high << 10) & 0x400) | ((low >> 25) & 0x3FF));
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if (signed)
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{
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r0 = SignExtend(r0, 12);
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g0 = SignExtend(g0, 12);
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b0 = SignExtend(b0, 12);
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}
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r1 = (r0 + SignExtend((int)(low >> 35), 8)) & 0xFFF;
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g1 = (g0 + SignExtend((int)(low >> 45), 8)) & 0xFFF;
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b1 = (b0 + SignExtend((int)(low >> 55), 8)) & 0xFFF;
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r0 = Unquantize(r0, 12, signed);
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g0 = Unquantize(g0, 12, signed);
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b0 = Unquantize(b0, 12, signed);
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r1 = Unquantize(r1, 12, signed);
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g1 = Unquantize(g1, 12, signed);
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b1 = Unquantize(b1, 12, signed);
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subsetCount = 1;
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break;
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case 14:
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r0 = (int)(low >> 5) & 0x1FF;
|
|
g0 = (int)(low >> 15) & 0x1FF;
|
|
b0 = (int)(low >> 25) & 0x1FF;
|
|
|
|
if (signed)
|
|
{
|
|
r0 = SignExtend(r0, 9);
|
|
g0 = SignExtend(g0, 9);
|
|
b0 = SignExtend(b0, 9);
|
|
}
|
|
|
|
r1 = r0 + SignExtend((int)(low >> 35), 5);
|
|
g1 = g0 + SignExtend((int)(low >> 45), 5);
|
|
b1 = b0 + SignExtend((int)(low >> 55), 5);
|
|
|
|
r2 = r0 + SignExtend((int)(high >> 1), 5);
|
|
g2 = g0 + SignExtend((int)(((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 5);
|
|
b2 = b0 + SignExtend((int)(((low >> 10) & 0x10) | ((high << 3) & 8) | (low >> 61)), 5);
|
|
|
|
r3 = r0 + SignExtend((int)(high >> 7), 5);
|
|
g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0xF)), 5);
|
|
b3 = b0 + SignExtend((int)(
|
|
((low >> 30) & 0x10) |
|
|
((high >> 9) & 0x08) |
|
|
((high >> 4) & 0x04) |
|
|
((low >> 59) & 0x02) |
|
|
((low >> 50) & 0x01)), 5);
|
|
|
|
r0 = Unquantize(r0, 9, signed);
|
|
g0 = Unquantize(g0, 9, signed);
|
|
b0 = Unquantize(b0, 9, signed);
|
|
|
|
r1 = Unquantize(r1 & 0x1FF, 9, signed);
|
|
g1 = Unquantize(g1 & 0x1FF, 9, signed);
|
|
b1 = Unquantize(b1 & 0x1FF, 9, signed);
|
|
|
|
r2 = Unquantize(r2 & 0x1FF, 9, signed);
|
|
g2 = Unquantize(g2 & 0x1FF, 9, signed);
|
|
b2 = Unquantize(b2 & 0x1FF, 9, signed);
|
|
|
|
r3 = Unquantize(r3 & 0x1FF, 9, signed);
|
|
g3 = Unquantize(g3 & 0x1FF, 9, signed);
|
|
b3 = Unquantize(b3 & 0x1FF, 9, signed);
|
|
|
|
subsetCount = 2;
|
|
break;
|
|
case 15:
|
|
r0 = (BitReverse6((int)(low >> 39) & 0x3F) << 10) | ((int)(low >> 5) & 0x3FF);
|
|
g0 = (BitReverse6((int)(low >> 49) & 0x3F) << 10) | ((int)(low >> 15) & 0x3FF);
|
|
b0 = ((BitReverse6((int)(low >> 59)) | (int)(high & 1)) << 10) | ((int)(low >> 25) & 0x3FF);
|
|
|
|
if (signed)
|
|
{
|
|
r0 = SignExtend(r0, 16);
|
|
g0 = SignExtend(g0, 16);
|
|
b0 = SignExtend(b0, 16);
|
|
}
|
|
|
|
r1 = (r0 + SignExtend((int)(low >> 35), 4)) & 0xFFFF;
|
|
g1 = (g0 + SignExtend((int)(low >> 45), 4)) & 0xFFFF;
|
|
b1 = (b0 + SignExtend((int)(low >> 55), 4)) & 0xFFFF;
|
|
|
|
subsetCount = 1;
|
|
break;
|
|
case 18:
|
|
r0 = (int)(low >> 5) & 0xFF;
|
|
g0 = (int)(low >> 15) & 0xFF;
|
|
b0 = (int)(low >> 25) & 0xFF;
|
|
|
|
if (signed)
|
|
{
|
|
r0 = SignExtend(r0, 8);
|
|
g0 = SignExtend(g0, 8);
|
|
b0 = SignExtend(b0, 8);
|
|
}
|
|
|
|
r1 = r0 + SignExtend((int)(low >> 35), 6);
|
|
g1 = g0 + SignExtend((int)(low >> 45), 5);
|
|
b1 = b0 + SignExtend((int)(low >> 55), 5);
|
|
|
|
r2 = r0 + SignExtend((int)(high >> 1), 6);
|
|
g2 = g0 + SignExtend((int)(((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 5);
|
|
b2 = b0 + SignExtend((int)(((low >> 10) & 0x10) | ((high << 3) & 8) | (low >> 61)), 5);
|
|
|
|
r3 = r0 + SignExtend((int)(high >> 7), 6);
|
|
g3 = g0 + SignExtend((int)(((low >> 9) & 0x10) | ((low >> 51) & 0xF)), 5);
|
|
b3 = b0 + SignExtend((int)(
|
|
((low >> 30) & 0x18) |
|
|
((low >> 21) & 0x04) |
|
|
((low >> 59) & 0x02) |
|
|
((low >> 50) & 0x01)), 5);
|
|
|
|
r0 = Unquantize(r0, 8, signed);
|
|
g0 = Unquantize(g0, 8, signed);
|
|
b0 = Unquantize(b0, 8, signed);
|
|
|
|
r1 = Unquantize(r1 & 0xFF, 8, signed);
|
|
g1 = Unquantize(g1 & 0xFF, 8, signed);
|
|
b1 = Unquantize(b1 & 0xFF, 8, signed);
|
|
|
|
r2 = Unquantize(r2 & 0xFF, 8, signed);
|
|
g2 = Unquantize(g2 & 0xFF, 8, signed);
|
|
b2 = Unquantize(b2 & 0xFF, 8, signed);
|
|
|
|
r3 = Unquantize(r3 & 0xFF, 8, signed);
|
|
g3 = Unquantize(g3 & 0xFF, 8, signed);
|
|
b3 = Unquantize(b3 & 0xFF, 8, signed);
|
|
|
|
subsetCount = 2;
|
|
break;
|
|
case 22:
|
|
r0 = (int)(low >> 5) & 0xFF;
|
|
g0 = (int)(low >> 15) & 0xFF;
|
|
b0 = (int)(low >> 25) & 0xFF;
|
|
|
|
if (signed)
|
|
{
|
|
r0 = SignExtend(r0, 8);
|
|
g0 = SignExtend(g0, 8);
|
|
b0 = SignExtend(b0, 8);
|
|
}
|
|
|
|
r1 = r0 + SignExtend((int)(low >> 35), 5);
|
|
g1 = g0 + SignExtend((int)(low >> 45), 6);
|
|
b1 = b0 + SignExtend((int)(low >> 55), 5);
|
|
|
|
r2 = r0 + SignExtend((int)(high >> 1), 5);
|
|
g2 = g0 + SignExtend((int)(((low >> 18) & 0x20) | ((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 6);
|
|
b2 = b0 + SignExtend((int)(((low >> 10) & 0x10) | ((high << 3) & 0x08) | (low >> 61)), 5);
|
|
|
|
r3 = r0 + SignExtend((int)(high >> 7), 5);
|
|
g3 = g0 + SignExtend((int)(((low >> 28) & 0x20) | ((low >> 36) & 0x10) | ((low >> 51) & 0x0F)), 6);
|
|
b3 = b0 + SignExtend((int)(
|
|
((low >> 30) & 0x10) |
|
|
((high >> 9) & 0x08) |
|
|
((high >> 4) & 0x04) |
|
|
((low >> 59) & 0x02) |
|
|
((low >> 13) & 0x01)), 5);
|
|
|
|
r0 = Unquantize(r0, 8, signed);
|
|
g0 = Unquantize(g0, 8, signed);
|
|
b0 = Unquantize(b0, 8, signed);
|
|
|
|
r1 = Unquantize(r1 & 0xFF, 8, signed);
|
|
g1 = Unquantize(g1 & 0xFF, 8, signed);
|
|
b1 = Unquantize(b1 & 0xFF, 8, signed);
|
|
|
|
r2 = Unquantize(r2 & 0xFF, 8, signed);
|
|
g2 = Unquantize(g2 & 0xFF, 8, signed);
|
|
b2 = Unquantize(b2 & 0xFF, 8, signed);
|
|
|
|
r3 = Unquantize(r3 & 0xFF, 8, signed);
|
|
g3 = Unquantize(g3 & 0xFF, 8, signed);
|
|
b3 = Unquantize(b3 & 0xFF, 8, signed);
|
|
|
|
subsetCount = 2;
|
|
break;
|
|
case 26:
|
|
r0 = (int)(low >> 5) & 0xFF;
|
|
g0 = (int)(low >> 15) & 0xFF;
|
|
b0 = (int)(low >> 25) & 0xFF;
|
|
|
|
if (signed)
|
|
{
|
|
r0 = SignExtend(r0, 8);
|
|
g0 = SignExtend(g0, 8);
|
|
b0 = SignExtend(b0, 8);
|
|
}
|
|
|
|
r1 = r0 + SignExtend((int)(low >> 35), 5);
|
|
g1 = g0 + SignExtend((int)(low >> 45), 5);
|
|
b1 = b0 + SignExtend((int)(low >> 55), 6);
|
|
|
|
r2 = r0 + SignExtend((int)(high >> 1), 5);
|
|
g2 = g0 + SignExtend((int)(((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 5);
|
|
b2 = b0 + SignExtend((int)(
|
|
((low >> 18) & 0x20) |
|
|
((low >> 10) & 0x10) |
|
|
((high << 3) & 0x08) |
|
|
(low >> 61)), 6);
|
|
|
|
r3 = r0 + SignExtend((int)(high >> 7), 5);
|
|
g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0xF)), 5);
|
|
b3 = b0 + SignExtend((int)(
|
|
((low >> 28) & 0x20) |
|
|
((low >> 30) & 0x10) |
|
|
((high >> 9) & 0x08) |
|
|
((high >> 4) & 0x04) |
|
|
((low >> 12) & 0x02) |
|
|
((low >> 50) & 0x01)), 6);
|
|
|
|
r0 = Unquantize(r0, 8, signed);
|
|
g0 = Unquantize(g0, 8, signed);
|
|
b0 = Unquantize(b0, 8, signed);
|
|
|
|
r1 = Unquantize(r1 & 0xFF, 8, signed);
|
|
g1 = Unquantize(g1 & 0xFF, 8, signed);
|
|
b1 = Unquantize(b1 & 0xFF, 8, signed);
|
|
|
|
r2 = Unquantize(r2 & 0xFF, 8, signed);
|
|
g2 = Unquantize(g2 & 0xFF, 8, signed);
|
|
b2 = Unquantize(b2 & 0xFF, 8, signed);
|
|
|
|
r3 = Unquantize(r3 & 0xFF, 8, signed);
|
|
g3 = Unquantize(g3 & 0xFF, 8, signed);
|
|
b3 = Unquantize(b3 & 0xFF, 8, signed);
|
|
|
|
subsetCount = 2;
|
|
break;
|
|
case 30:
|
|
r0 = (int)(low >> 5) & 0x3F;
|
|
g0 = (int)(low >> 15) & 0x3F;
|
|
b0 = (int)(low >> 25) & 0x3F;
|
|
|
|
r1 = (int)(low >> 35) & 0x3F;
|
|
g1 = (int)(low >> 45) & 0x3F;
|
|
b1 = (int)(low >> 55) & 0x3F;
|
|
|
|
r2 = (int)(high >> 1) & 0x3F;
|
|
g2 = (int)(((low >> 16) & 0x20) | ((low >> 20) & 0x10) | ((low >> 41) & 0xF));
|
|
b2 = (int)(((low >> 17) & 0x20) | ((low >> 10) & 0x10) | ((high << 3) & 0x08) | (low >> 61));
|
|
|
|
r3 = (int)(high >> 7) & 0x3F;
|
|
g3 = (int)(((low >> 26) & 0x20) | ((low >> 7) & 0x10) | ((low >> 51) & 0xF));
|
|
b3 = (int)(
|
|
((low >> 28) & 0x20) |
|
|
((low >> 30) & 0x10) |
|
|
((low >> 29) & 0x08) |
|
|
((low >> 21) & 0x04) |
|
|
((low >> 12) & 0x03));
|
|
|
|
if (signed)
|
|
{
|
|
r0 = SignExtend(r0, 6);
|
|
g0 = SignExtend(g0, 6);
|
|
b0 = SignExtend(b0, 6);
|
|
|
|
r1 = SignExtend(r1, 6);
|
|
g1 = SignExtend(g1, 6);
|
|
b1 = SignExtend(b1, 6);
|
|
|
|
r2 = SignExtend(r2, 6);
|
|
g2 = SignExtend(g2, 6);
|
|
b2 = SignExtend(b2, 6);
|
|
|
|
r3 = SignExtend(r3, 6);
|
|
g3 = SignExtend(g3, 6);
|
|
b3 = SignExtend(b3, 6);
|
|
}
|
|
|
|
r0 = Unquantize(r0, 6, signed);
|
|
g0 = Unquantize(g0, 6, signed);
|
|
b0 = Unquantize(b0, 6, signed);
|
|
|
|
r1 = Unquantize(r1, 6, signed);
|
|
g1 = Unquantize(g1, 6, signed);
|
|
b1 = Unquantize(b1, 6, signed);
|
|
|
|
r2 = Unquantize(r2, 6, signed);
|
|
g2 = Unquantize(g2, 6, signed);
|
|
b2 = Unquantize(b2, 6, signed);
|
|
|
|
r3 = Unquantize(r3, 6, signed);
|
|
g3 = Unquantize(g3, 6, signed);
|
|
b3 = Unquantize(b3, 6, signed);
|
|
|
|
subsetCount = 2;
|
|
break;
|
|
default:
|
|
subsetCount = 0;
|
|
break;
|
|
}
|
|
|
|
if (subsetCount > 0)
|
|
{
|
|
endPoints[0] = new RgbaColor32(r0, g0, b0, HalfOne);
|
|
endPoints[1] = new RgbaColor32(r1, g1, b1, HalfOne);
|
|
|
|
if (subsetCount > 1)
|
|
{
|
|
endPoints[2] = new RgbaColor32(r2, g2, b2, HalfOne);
|
|
endPoints[3] = new RgbaColor32(r3, g3, b3, HalfOne);
|
|
}
|
|
}
|
|
|
|
return subsetCount;
|
|
}
|
|
|
|
private static int SignExtend(int value, int bits)
|
|
{
|
|
int shift = 32 - bits;
|
|
return (value << shift) >> shift;
|
|
}
|
|
|
|
private static int Unquantize(int value, int bits, bool signed)
|
|
{
|
|
if (signed)
|
|
{
|
|
if (bits >= 16)
|
|
{
|
|
return value;
|
|
}
|
|
else
|
|
{
|
|
bool sign = value < 0;
|
|
|
|
if (sign)
|
|
{
|
|
value = -value;
|
|
}
|
|
|
|
if (value == 0)
|
|
{
|
|
return value;
|
|
}
|
|
else if (value >= ((1 << (bits - 1)) - 1))
|
|
{
|
|
value = 0x7FFF;
|
|
}
|
|
else
|
|
{
|
|
value = ((value << 15) + 0x4000) >> (bits - 1);
|
|
}
|
|
|
|
if (sign)
|
|
{
|
|
value = -value;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (bits >= 15 || value == 0)
|
|
{
|
|
return value;
|
|
}
|
|
else if (value == ((1 << bits) - 1))
|
|
{
|
|
return 0xFFFF;
|
|
}
|
|
else
|
|
{
|
|
return ((value << 16) + 0x8000) >> bits;
|
|
}
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
private static ushort FinishUnquantize(int value, bool signed)
|
|
{
|
|
if (signed)
|
|
{
|
|
value = value < 0 ? -((-value * 31) >> 5) : (value * 31) >> 5;
|
|
|
|
int sign = 0;
|
|
if (value < 0)
|
|
{
|
|
sign = 0x8000;
|
|
value = -value;
|
|
}
|
|
|
|
return (ushort)(sign | value);
|
|
}
|
|
else
|
|
{
|
|
return (ushort)((value * 31) >> 6);
|
|
}
|
|
}
|
|
|
|
private static int BitReverse6(int value)
|
|
{
|
|
value = ((value >> 1) & 0x55) | ((value << 1) & 0xaa);
|
|
value = ((value >> 2) & 0x33) | ((value << 2) & 0xcc);
|
|
value = ((value >> 4) & 0x0f) | ((value << 4) & 0xf0);
|
|
return value >> 2;
|
|
}
|
|
}
|
|
}
|