public static ShaderRequiresFlags GlobalFlagsToRequireFlags(GlobalFlags flags)
{
ShaderRequiresFlags result = ShaderRequiresFlags.None;
if (flags.HasFlag(GlobalFlags.ForceEarlyDepthStencilTest))
{
result |= ShaderRequiresFlags.EarlyDepthStencil;
}
return(result);
}
public void WriteTo(BinaryStream stream, int baseOffset = 0)
{
var value = Value;
switch (Type)
{
case DescriptorType.None:
stream.WriteByte(value);
break;
case DescriptorType.BigValue:
case DescriptorType.Reference:
{
var code = (byte)~Type;
if (ReferenceType == ReferenceType.Offset)
{
var ptr = (int)stream.Position + baseOffset;
var offset = (ptr - value);
if (offset < 0)
{
throw new InvalidOperationException("Cannot write a forward-offset!");
}
value = offset;
}
if (GlobalFlags.HasFlag(DescriptorFlags.Use24Bit))
{
if ((value & 0xFFFFFF) != value)
{
throw new InvalidOperationException($"Descriptor value '{value}' too large, cannot fit into 24-bits!");
}
value <<= 8;
value |= code;
stream.Write(value);
}
else
{
stream.WriteByte(code);
stream.Write(value);
}
} break;
}
}
public static string GetDescription(this GlobalFlags value)
{
string result = string.Empty;
foreach (Enum enumValue in Enum.GetValues(typeof(GlobalFlags)))
{
if ((int)value > 0 && value.HasFlag(enumValue))
{
if (!string.IsNullOrEmpty(result))
{
result += " | ";
}
result += enumValue.GetDescription();
}
}
return(result);
}
public static DescriptorTag CreateReference(int value, ReferenceType refType)
{
if (refType == ReferenceType.None)
{
throw new InvalidOperationException("ID:10T error -- why the f**k are you creating a reference with no type?!");
}
if (GlobalFlags.HasFlag(DescriptorFlags.Use24Bit))
{
if ((value & 0xFFFFFF) != value)
{
throw new InvalidOperationException($"Descriptor offset '{value}' too large, cannot fit into 24-bits!");
}
}
return(new DescriptorTag(value, DescriptorType.Reference, refType));
}
public static DescriptorTag Create(int value)
{
var type = DescriptorType.None;
if (value >= 254u)
{
type = DescriptorType.BigValue;
}
if (GlobalFlags.HasFlag(DescriptorFlags.Use24Bit))
{
if ((value & 0xFFFFFF) != value)
{
throw new InvalidOperationException($"Descriptor value '{value}' too large, cannot fit into 24-bits!");
}
}
return(new DescriptorTag(value, type, ReferenceType.None));
}
public static DescriptorTag Read(BinaryStream stream, ReferenceType refType = ReferenceType.None)
{
var ptr = (int)stream.Position;
var value = stream.ReadByte();
var type = GetDescriptorType(value);
if ((type == DescriptorType.Reference) && (refType == ReferenceType.None))
{
throw new InvalidOperationException("ID:10T error while reading a descriptor -- consumed a reference with no type defined!");
}
var isOffset = (type == DescriptorType.Reference) &&
(refType == ReferenceType.Offset);
if (type != DescriptorType.None)
{
if (GlobalFlags.HasFlag(DescriptorFlags.Use24Bit))
{
// move back
stream.Position -= 1;
// read in value without control code
value = (int)(stream.ReadUInt32() >> 8);
}
else
{
value = stream.ReadInt32();
}
if (isOffset)
{
// make offset absolute
value = (ptr - value);
}
}
return(new DescriptorTag(value, type, refType));
}
