public static ShaderProgramChunk Parse(BytecodeReader reader)
{
var program = new ShaderProgramChunk
{
Version = ShaderVersion.ParseShex(reader),
// Length Token (LenTok)
// Always follows VerTok
// [31:00] Unsigned integer count of number of DWORDs in program code, including version and length tokens.
// So the minimum value is 0x00000002 (if an empty program is ever valid).
Length = reader.ReadUInt32()
};
while (!reader.EndOfBuffer)
{
// Opcode Format (OpcodeToken0)
//
// [10:00] D3D10_SB_OPCODE_TYPE
// if( [10:00] == D3D10_SB_OPCODE_CUSTOMDATA )
// {
// Token starts a custom-data block. See "Custom-Data Block Format".
// }
// else // standard opcode token
// {
// [23:11] Opcode-Specific Controls
// [30:24] Instruction length in DWORDs including the opcode token.
// [31] 0 normally. 1 if extended operand definition, meaning next DWORD
// contains extended opcode token.
// }
var opcodeHeaderReader = reader.CopyAtCurrentPosition();
var opcodeToken0 = opcodeHeaderReader.ReadUInt32();
var opcodeHeader = new OpcodeHeader
{
OpcodeType = opcodeToken0.DecodeValue <OpcodeType>(0, 10),
Length = opcodeToken0.DecodeValue(24, 30),
IsExtended = (opcodeToken0.DecodeValue(31, 31) == 1)
};
OpcodeToken opcodeToken;
if (opcodeHeader.OpcodeType == OpcodeType.CustomData)
{
opcodeToken = CustomDataToken.Parse(reader, opcodeToken0);
}
else if (opcodeHeader.OpcodeType.IsDeclaration())
{
opcodeToken = DeclarationToken.Parse(reader, opcodeHeader.OpcodeType);
}
else // Not custom data or declaration, so must be instruction.
{
opcodeToken = InstructionToken.Parse(reader, opcodeHeader);
}
opcodeToken.Header = opcodeHeader;
program.Tokens.Add(opcodeToken);
}
program.LinkControlFlowInstructions();
return(program);
}
protected void ParseInstance(BytecodeReader reader, uint chunkSize)
{
Version = ShaderVersion.ParseShex(reader);
var sizeInUint32 = reader.ReadUInt32();
var dxilMagic = reader.ReadUInt32();
DxilVersion = reader.ReadUInt32();
var bitcodeOffset = reader.ReadUInt32();
Debug.Assert(bitcodeOffset == 16, "Unexpected bitcode offset found");
var bitcodeLength = reader.ReadInt32();
var bitcodeReader = reader.CopyAtCurrentPosition();
Bitcode = bitcodeReader.ReadBytes(bitcodeLength);
}