public static DebugInputOutputSignatureChunk Parse(DebugBytecodeReader reader, ChunkType chunkType,
ProgramType programType)
{
DebugInputOutputSignatureChunk result;
switch (chunkType)
{
case ChunkType.Isgn:
case ChunkType.Isg1:
result = new DebugInputSignatureChunk();
break;
case ChunkType.Osgn:
case ChunkType.Osg1:
case ChunkType.Osg5:
result = new DebugOutputSignatureChunk();
break;
case ChunkType.Pcsg:
result = new DebugPatchConstantSignatureChunk();
break;
default:
throw new ArgumentOutOfRangeException("chunkType", "Unrecognised chunk type: " + chunkType);
}
var chunkReader = reader.CopyAtCurrentPosition("ChunkReader", reader);
var elementCount = chunkReader.ReadUInt32("ElementCount");
var uniqueKey = chunkReader.ReadUInt32("UniqueKey");
SignatureElementSize elementSize;
switch (chunkType)
{
case ChunkType.Isgn:
case ChunkType.Osgn:
case ChunkType.Pcsg:
elementSize = SignatureElementSize._6;
break;
case ChunkType.Osg5:
elementSize = SignatureElementSize._7;
break;
case ChunkType.Osg1:
case ChunkType.Isg1:
elementSize = SignatureElementSize._8;
break;
default:
throw new ArgumentOutOfRangeException("chunkType", "Unrecognised chunk type: " + chunkType);
}
for (int i = 0; i < elementCount; i++)
{
var indent = chunkReader.AddIndent($"{i}");
var parameter = DebugSignatureParameterDescription.Parse(reader, chunkReader, chunkType, elementSize,
programType);
result.Parameters.Add(parameter);
chunkReader.RemoveIndent();
indent.Name += $": {parameter.SemanticName}";
}
return(result);
}
public static DebugSignatureParameterDescription Parse(DebugBytecodeReader reader, DebugBytecodeReader parameterReader,
ChunkType chunkType, SignatureElementSize size, ProgramType programType)
{
uint stream = 0;
if (size == SignatureElementSize._7 || size == SignatureElementSize._8)
{
stream = parameterReader.ReadUInt32("Stream");
}
uint nameOffset = parameterReader.ReadUInt32("NameOffset");
var nameReader = reader.CopyAtOffset("NameReader", parameterReader, (int)nameOffset);
var result = new DebugSignatureParameterDescription
{
SemanticName = nameReader.ReadString("SemanticName"),
SemanticIndex = parameterReader.ReadUInt32("SemanticIndex"),
SystemValueType = parameterReader.ReadEnum32 <Name>("SystemValueType"),
ComponentType = parameterReader.ReadEnum32 <RegisterComponentType>("ComponentType"),
Register = parameterReader.ReadUInt32("Register"),
Stream = stream,
};
result.Mask = parameterReader.ReadEnum8 <ComponentMask>("Mask");
result.ReadWriteMask = parameterReader.ReadEnum8 <ComponentMask>("ReadWriteMask");
parameterReader.ReadUInt16("MaskPadding");
if (size == SignatureElementSize._8)
{
MinPrecision minPrecision = parameterReader.ReadEnum32 <MinPrecision>("MinPrecision");
result.MinPrecision = minPrecision;
}
// This is my guesswork, but it works so far...
if (chunkType == ChunkType.Osg5 ||
chunkType == ChunkType.Osgn ||
chunkType == ChunkType.Osg1 ||
(chunkType == ChunkType.Pcsg && programType == ProgramType.HullShader))
{
result.ReadWriteMask = (ComponentMask)(ComponentMask.All - result.ReadWriteMask);
}
// Vertex and pixel shaders need special handling for SystemValueType in the output signature.
if ((programType == ProgramType.PixelShader || programType == ProgramType.VertexShader) &&
(chunkType == ChunkType.Osg5 || chunkType == ChunkType.Osgn || chunkType == ChunkType.Osg1))
{
if (result.Register == 0xffffffff)
{
switch (result.SemanticName.ToUpper())
{
case "SV_DEPTH":
result.SystemValueType = Name.Depth;
break;
case "SV_COVERAGE":
result.SystemValueType = Name.Coverage;
break;
case "SV_DEPTHGREATEREQUAL":
result.SystemValueType = Name.DepthGreaterEqual;
break;
case "SV_DEPTHLESSEQUAL":
result.SystemValueType = Name.DepthLessEqual;
break;
case "SV_STENCILREF":
result.SystemValueType = Name.StencilRef;
break;
}
}
else if (programType == ProgramType.PixelShader)
{
result.SystemValueType = Name.Target;
}
}
return(result);
}