diff options
| author | TSR Berry <20988865+TSRBerry@users.noreply.github.com> | 2023-04-08 01:22:00 +0200 |
|---|---|---|
| committer | Mary <thog@protonmail.com> | 2023-04-27 23:51:14 +0200 |
| commit | cee712105850ac3385cd0091a923438167433f9f (patch) | |
| tree | 4a5274b21d8b7f938c0d0ce18736d3f2993b11b1 /src/Ryujinx.Graphics.Texture/Astc/BitStream128.cs | |
| parent | cd124bda587ef09668a971fa1cac1c3f0cfc9f21 (diff) | |
Move solution and projects to src
Diffstat (limited to 'src/Ryujinx.Graphics.Texture/Astc/BitStream128.cs')
| -rw-r--r-- | src/Ryujinx.Graphics.Texture/Astc/BitStream128.cs | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/Ryujinx.Graphics.Texture/Astc/BitStream128.cs b/src/Ryujinx.Graphics.Texture/Astc/BitStream128.cs new file mode 100644 index 00000000..3bf9769f --- /dev/null +++ b/src/Ryujinx.Graphics.Texture/Astc/BitStream128.cs @@ -0,0 +1,72 @@ +using Ryujinx.Common.Utilities; +using System; +using System.Diagnostics; + +namespace Ryujinx.Graphics.Texture.Astc +{ + public struct BitStream128 + { + private Buffer16 _data; + public int BitsLeft { get; set; } + + public BitStream128(Buffer16 data) + { + _data = data; + BitsLeft = 128; + } + + public int ReadBits(int bitCount) + { + Debug.Assert(bitCount < 32); + + if (bitCount == 0) + { + return 0; + } + + int mask = (1 << bitCount) - 1; + int value = _data.As<int>() & mask; + + Span<ulong> span = _data.AsSpan<ulong>(); + + ulong carry = span[1] << (64 - bitCount); + span[0] = (span[0] >> bitCount) | carry; + span[1] >>= bitCount; + + BitsLeft -= bitCount; + + return value; + } + + public void WriteBits(int value, int bitCount) + { + Debug.Assert(bitCount < 32); + + if (bitCount == 0) return; + + ulong maskedValue = (uint)(value & ((1 << bitCount) - 1)); + + Span<ulong> span = _data.AsSpan<ulong>(); + + if (BitsLeft < 64) + { + ulong lowMask = maskedValue << BitsLeft; + span[0] |= lowMask; + } + + if (BitsLeft + bitCount > 64) + { + if (BitsLeft > 64) + { + span[1] |= maskedValue << (BitsLeft - 64); + } + else + { + span[1] |= maskedValue >> (64 - BitsLeft); + } + } + + BitsLeft += bitCount; + } + } +}
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