/// <summary>
/// Parse a raw cached user shader program into an array of shader cache entry.
/// </summary>
/// <param name="data">The raw cached user shader program</param>
/// <param name="fileHeader">The user shader program header</param>
/// <returns>An array of shader cache entry</returns>
public static GuestShaderCacheEntry[] Parse(ref ReadOnlySpan <byte> data, out GuestShaderCacheHeader fileHeader)
{
fileHeader = MemoryMarshal.Read <GuestShaderCacheHeader>(data);
data = data.Slice(Unsafe.SizeOf <GuestShaderCacheHeader>());
ReadOnlySpan <GuestShaderCacheEntryHeader> entryHeaders = MemoryMarshal.Cast <byte, GuestShaderCacheEntryHeader>(data.Slice(0, fileHeader.Count * Unsafe.SizeOf <GuestShaderCacheEntryHeader>()));
data = data.Slice(fileHeader.Count * Unsafe.SizeOf <GuestShaderCacheEntryHeader>());
GuestShaderCacheEntry[] result = new GuestShaderCacheEntry[fileHeader.Count];
for (int i = 0; i < result.Length; i++)
{
GuestShaderCacheEntryHeader header = entryHeaders[i];
// Ignore empty entries
if (header.Size == 0 && header.SizeA == 0)
{
continue;
}
byte[] code = data.Slice(0, header.Size + header.SizeA).ToArray();
data = data.Slice(header.Size + header.SizeA);
result[i] = new GuestShaderCacheEntry(header, code);
ReadOnlySpan <GuestTextureDescriptor> textureDescriptors = MemoryMarshal.Cast <byte, GuestTextureDescriptor>(data.Slice(0, header.GpuAccessorHeader.TextureDescriptorCount * Unsafe.SizeOf <GuestTextureDescriptor>()));
foreach (GuestTextureDescriptor textureDescriptor in textureDescriptors)
{
result[i].TextureDescriptors.Add((int)textureDescriptor.Handle, textureDescriptor);
}
data = data.Slice(header.GpuAccessorHeader.TextureDescriptorCount * Unsafe.SizeOf <GuestTextureDescriptor>());
}
return(result);
}
/// <summary>
/// Create a new instance of <see cref="GuestShaderCacheEntry"/>.
/// </summary>
/// <param name="header">The header of the cached shader entry</param>
/// <param name="code">The code of this shader</param>
private GuestShaderCacheEntry(GuestShaderCacheEntryHeader header, byte[] code)
{
Header = header;
Code = code;
TextureDescriptors = new Dictionary <int, GuestTextureDescriptor>();
}
