AssetRipper/AssetRipper.TextureDecoder
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Astc BitTransferSigned use ref instead of pointer

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Jeremy Pritts committed 2023-09-17 00:26:00 -04:00
1 parent b3371b34d3
commit 2a41577d28
1 file changed
+17 -17
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AssetRipper.TextureDecoder/Astc/AstcDecoder.cs
+17 -17
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@@ -240,7 +240,7 @@ namespace AssetRipper.TextureDecoder.Astc
Span<IntSeqData> epSeq = stackalloc IntSeqData[32];
DecodeIntseq(input, pBlock.part_num == 1 ? 17 : 29, CemTableA[pBlock.cem_range], CemTableB[pBlock.cem_range], pBlock.endpoint_value_num, false, epSeq);
int* ev = stackalloc int[32];
Span<int> ev = stackalloc int[32];
switch (CemTableA[pBlock.cem_range])
{
case 3:
@@ -355,8 +355,8 @@ namespace AssetRipper.TextureDecoder.Astc
break;
}
int* v = ev;
for (int cem = 0, cemOff = 0; cem < pBlock.part_num; v += (pBlock.cem[cem] / 4 + 1) * 2, cem++, cemOff += 8)
Span<int> v = ev;
for (int cem = 0, cemOff = 0; cem < pBlock.part_num; v = v.Slice((pBlock.cem[cem] / 4 + 1) * 2), cem++, cemOff += 8)
{
switch (pBlock.cem[cem])
{
@@ -383,8 +383,8 @@ namespace AssetRipper.TextureDecoder.Astc
}
break;
case 5:
BitTransferSigned(&v[1], &v[0]);
BitTransferSigned(&v[3], &v[2]);
BitTransferSigned(ref v[1], ref v[0]);
BitTransferSigned(ref v[3], ref v[2]);
v[1] += v[0];
fixed (int* endpoint = &pBlock.endpoints[cemOff])
{
@@ -415,9 +415,9 @@ namespace AssetRipper.TextureDecoder.Astc
break;
case 9:
BitTransferSigned(&v[1], &v[0]);
BitTransferSigned(&v[3], &v[2]);
BitTransferSigned(&v[5], &v[4]);
BitTransferSigned(ref v[1], ref v[0]);
BitTransferSigned(ref v[3], ref v[2]);
BitTransferSigned(ref v[5], ref v[4]);
if (v[1] + v[3] + v[5] >= 0)
{
fixed (int* endpoint = &pBlock.endpoints[cemOff])
@@ -458,10 +458,10 @@ namespace AssetRipper.TextureDecoder.Astc
break;
case 13:
BitTransferSigned(&v[1], &v[0]);
BitTransferSigned(&v[3], &v[2]);
BitTransferSigned(&v[5], &v[4]);
BitTransferSigned(&v[7], &v[6]);
BitTransferSigned(ref v[1], ref v[0]);
BitTransferSigned(ref v[3], ref v[2]);
BitTransferSigned(ref v[5], ref v[4]);
BitTransferSigned(ref v[7], ref v[6]);
if (v[1] + v[3] + v[5] >= 0)
{
fixed (int* endpoint = &pBlock.endpoints[cemOff])
@@ -965,13 +965,13 @@ namespace AssetRipper.TextureDecoder.Astc
}
[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
private static unsafe void BitTransferSigned(int* a, int* b)
private static void BitTransferSigned(ref int a, ref int b)
{
*b = (*b >> 1) | (*a & 0x80);
*a = (*a >> 1) & 0x3f;
if ((*a & 0x20) != 0)
b = (b >> 1) | (a & 0x80);
a = (a >> 1) & 0x3f;
if ((a & 0x20) != 0)
{
*a -= 0x40;
a -= 0x40;
}
}