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#pragma warning disable CS0649
using System.Runtime.InteropServices;
namespace CompressShaders
{
static class DetectFp64
{
struct DXBCHeader
{
public uint FourCC; // Four character code "DXBC"
public uint Hash0; // 32-bit hash of the DXBC file
public uint Hash1; // 32-bit hash of the DXBC file
public uint Hash2; // 32-bit hash of the DXBC file
public uint Hash3; // 32-bit hash of the DXBC file
public uint unknownOne;
public uint TotalSize; // Total size of the DXBC file in bytes
public int NumChunks; // Number of chunks in the DXBC file
};
public static bool usesFp64( ReadOnlySpan<byte> dxbc )
{
ReadOnlySpan<DXBCHeader> dxbcHeaderSpan = MemoryMarshal.Cast<byte, DXBCHeader>( dxbc );
DXBCHeader dxbcHeader = dxbcHeaderSpan[ 0 ];
int cbHeader = Marshal.SizeOf<DXBCHeader>();
int nChunks = dxbcHeader.NumChunks;
ReadOnlySpan<int> chunkOffsets = MemoryMarshal.Cast<byte, int>( dxbc.Slice( cbHeader, nChunks * 4 ) );
foreach( int off in chunkOffsets )
{
uint id = MemoryMarshal.Cast<byte, uint>( dxbc.Slice( off, 4 ) )[ 0 ];
const uint SFI0 = 0x30494653;
if( id != SFI0 )
continue;
int size = MemoryMarshal.Cast<byte, int>( dxbc.Slice( off + 4, 4 ) )[ 0 ];
if( size < 4 )
throw new ApplicationException();
uint data = MemoryMarshal.Cast<byte, uint>( dxbc.Slice( off + 8, 4 ) )[ 0 ];
return 0 != ( data & 1u );
}
return false;
}
}
}
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