public DXT3Block(EndianBinaryReader reader, DXTxBlockLayout blockLayout)
{
switch (blockLayout)
{
case DXTxBlockLayout.Normal:
Alpha = reader.ReadUInt64();
Color = new DXT1Block(reader, blockLayout);
break;
case DXTxBlockLayout.PSP:
Color = new DXT1Block(reader, blockLayout);
Alpha = reader.ReadUInt64();
break;
default:
throw new Exception("Unknown block layout");
}
}
public DXT5Block(EndianBinaryReader reader, DXTxBlockLayout blockLayout)
{
byte bits_5, bits_4, bits_3, bits_2, bits_1, bits_0;
switch (blockLayout)
{
case DXTxBlockLayout.Normal:
Alpha0 = reader.ReadByte();
Alpha1 = reader.ReadByte();
bits_5 = reader.ReadByte();
bits_4 = reader.ReadByte();
bits_3 = reader.ReadByte();
bits_2 = reader.ReadByte();
bits_1 = reader.ReadByte();
bits_0 = reader.ReadByte();
Bits = DXTx.ExtractBits((((ulong)bits_0 << 40) | ((ulong)bits_1 << 32) | ((ulong)bits_2 << 24) | ((ulong)bits_3 << 16) | ((ulong)bits_4 << 8) | (ulong)bits_5), 3);
Color = new DXT1Block(reader, blockLayout);
break;
case DXTxBlockLayout.PSP:
Color = new DXT1Block(reader, blockLayout);
Alpha0 = reader.ReadByte();
Alpha1 = reader.ReadByte();
bits_5 = reader.ReadByte();
bits_4 = reader.ReadByte();
bits_3 = reader.ReadByte();
bits_2 = reader.ReadByte();
bits_1 = reader.ReadByte();
bits_0 = reader.ReadByte();
Bits = DXTx.ExtractBits((((ulong)bits_0 << 40) | ((ulong)bits_1 << 32) | ((ulong)bits_2 << 24) | ((ulong)bits_3 << 16) | ((ulong)bits_4 << 8) | (ulong)bits_5), 3);
break;
default:
throw new Exception("Unknown block layout");
}
}
public DXT1Block(EndianBinaryReader reader, DXTxBlockLayout blockLayout)
{
byte color0_hi, color0_lo, color1_hi, color1_lo, bits_3, bits_2, bits_1, bits_0;
switch (blockLayout)
{
case DXTxBlockLayout.Normal:
color0_hi = reader.ReadByte();
color0_lo = reader.ReadByte();
color1_hi = reader.ReadByte();
color1_lo = reader.ReadByte();
bits_3 = reader.ReadByte();
bits_2 = reader.ReadByte();
bits_1 = reader.ReadByte();
bits_0 = reader.ReadByte();
break;
case DXTxBlockLayout.PSP:
bits_3 = reader.ReadByte();
bits_2 = reader.ReadByte();
bits_1 = reader.ReadByte();
bits_0 = reader.ReadByte();
color0_hi = reader.ReadByte();
color0_lo = reader.ReadByte();
color1_hi = reader.ReadByte();
color1_lo = reader.ReadByte();
break;
default:
throw new Exception("Unknown block layout");
}
Bits = DXTx.ExtractBits((((uint)bits_0 << 24) | ((uint)bits_1 << 16) | ((uint)bits_2 << 8) | (uint)bits_3), 2);
Color0 = (ushort)(((ushort)color0_lo << 8) | (ushort)color0_hi);
Color1 = (ushort)(((ushort)color1_lo << 8) | (ushort)color1_hi);
}
private static byte[] DecodeDXT5Block(EndianBinaryReader reader, PixelDataFormat inputFormat, DXTxBlockLayout blockLayout)
{
DXT5Block inBlock = new DXT5Block(reader, blockLayout);
byte[] outData = DecodeColorBlock(inBlock.Color, false, false);
for (int y = 0; y < 4; y++)
{
for (int x = 0; x < 4; x++)
{
byte code = inBlock.Bits[(y * 4) + x];
int destOffset = (((y * 4) + x) * 4) + 3;
if (inBlock.Alpha0 > inBlock.Alpha1)
{
switch (code)
{
case 0x00: outData[destOffset] = inBlock.Alpha0; break;
case 0x01: outData[destOffset] = inBlock.Alpha1; break;
case 0x02: outData[destOffset] = (byte)((6 * inBlock.Alpha0 + 1 * inBlock.Alpha1) / 7); break;
case 0x03: outData[destOffset] = (byte)((5 * inBlock.Alpha0 + 2 * inBlock.Alpha1) / 7); break;
case 0x04: outData[destOffset] = (byte)((4 * inBlock.Alpha0 + 3 * inBlock.Alpha1) / 7); break;
case 0x05: outData[destOffset] = (byte)((3 * inBlock.Alpha0 + 4 * inBlock.Alpha1) / 7); break;
case 0x06: outData[destOffset] = (byte)((2 * inBlock.Alpha0 + 5 * inBlock.Alpha1) / 7); break;
case 0x07: outData[destOffset] = (byte)((1 * inBlock.Alpha0 + 6 * inBlock.Alpha1) / 7); break;
}
}
else
{
switch (code)
{
case 0x00: outData[destOffset] = inBlock.Alpha0; break;
case 0x01: outData[destOffset] = inBlock.Alpha1; break;
case 0x02: outData[destOffset] = (byte)((4 * inBlock.Alpha0 + 1 * inBlock.Alpha1) / 5); break;
case 0x03: outData[destOffset] = (byte)((3 * inBlock.Alpha0 + 2 * inBlock.Alpha1) / 5); break;
case 0x04: outData[destOffset] = (byte)((2 * inBlock.Alpha0 + 3 * inBlock.Alpha1) / 5); break;
case 0x05: outData[destOffset] = (byte)((1 * inBlock.Alpha0 + 4 * inBlock.Alpha1) / 5); break;
case 0x06: outData[destOffset] = 0x00; break;
case 0x07: outData[destOffset] = 0xFF; break;
}
}
}
}
return(outData);
}
private static byte[] DecodeDXT3Block(EndianBinaryReader reader, PixelDataFormat inputFormat, DXTxBlockLayout blockLayout)
{
DXT3Block inBlock = new DXT3Block(reader, blockLayout);
byte[] outData = DecodeColorBlock(inBlock.Color, false, false);
ulong alpha = inBlock.Alpha;
for (int i = 0; i < outData.Length; i += 4)
{
outData[i + 3] = (byte)(((alpha & 0xF) << 4) | (alpha & 0xF));
alpha >>= 4;
}
return(outData);
}
private static byte[] DecodeDXT1Block(EndianBinaryReader reader, PixelDataFormat inputFormat, DXTxBlockLayout blockLayout)
{
DXT1Block inBlock = new DXT1Block(reader, blockLayout);
return(DecodeColorBlock(inBlock, (inputFormat & PixelDataFormat.MaskChannels) != PixelDataFormat.ChannelsRgb, true));
}