1 files changed, 66 insertions, 0 deletions
diff --git a/src/Ryujinx.Graphics.Texture/Astc/Bits.cs b/src/Ryujinx.Graphics.Texture/Astc/Bits.cs
new file mode 100644
index 00000000..b140a20a
--- /dev/null
+++ b/src/Ryujinx.Graphics.Texture/Astc/Bits.cs
@@ -0,0 +1,66 @@
+namespace Ryujinx.Graphics.Texture.Astc
+{
+    internal static class Bits
+    {
+        public static readonly ushort[] Replicate8_16Table;
+        public static readonly byte[] Replicate1_7Table;
+
+        static Bits()
+        {
+            Replicate8_16Table = new ushort[0x200];
+            Replicate1_7Table = new byte[0x200];
+
+            for (int i = 0; i < 0x200; i++)
+            {
+                Replicate8_16Table[i] = (ushort)Replicate(i, 8, 16);
+                Replicate1_7Table[i] = (byte)Replicate(i, 1, 7);
+            }
+        }
+
+        public static int Replicate8_16(int value)
+        {
+            return Replicate8_16Table[value];
+        }
+
+        public static int Replicate1_7(int value)
+        {
+            return Replicate1_7Table[value];
+        }
+
+        public static int Replicate(int value, int numberBits, int toBit)
+        {
+            if (numberBits == 0) return 0;
+            if (toBit == 0) return 0;
+
+            int tempValue = value & ((1 << numberBits) - 1);
+            int retValue = tempValue;
+            int resLength = numberBits;
+
+            while (resLength < toBit)
+            {
+                int comp = 0;
+                if (numberBits > toBit - resLength)
+                {
+                    int newShift = toBit - resLength;
+                    comp = numberBits - newShift;
+                    numberBits = newShift;
+                }
+                retValue <<= numberBits;
+                retValue |= tempValue >> comp;
+                resLength += numberBits;
+            }
+
+            return retValue;
+        }
+
+        // Transfers a bit as described in C.2.14
+        public static void BitTransferSigned(ref int a, ref int b)
+        {
+            b >>= 1;
+            b |= a & 0x80;
+            a >>= 1;
+            a &= 0x3F;
+            if ((a & 0x20) != 0) a -= 0x40;
+        }
+    }
+}