Function ParseGlobalInput

shadercompiler/ParserUtils.cpp:1251–1310

std::optional<std::vector<GlobalInputElement>> ParseGlobalInput( ParserState& state, const ScannerToken& input )
{
	auto processed = PreprocessString( input.stringValue );
	if( !processed )
	{
		return {};
	}

	auto tokens = TokenizeGlobalInput( { processed->c_str(), processed->c_str() + processed->size() } );
	if( !tokens )
	{
		state.ShowMessage( input.fileLocation, EC_CUSTOM_ERROR, "Malformed globalinput string" );
		return {};
	}

	std::vector<GlobalInputElement> result;
	for( auto& name : *tokens )
	{
		auto symbol = state.GetSymbolTable().LookupGlobal( ToString( name ).c_str() );
		bool isCBuffer = false;
		bool useCBuffers = false;
		if( useCBuffers )
		{
			if( symbol && symbol->type.IsStruct() )
			{
				symbol = nullptr;
			}
			if( !symbol )
			{
				symbol = state.GetSymbolTable().LookupBuffer( name );
				isCBuffer = true;
			}
		}
		else
		{
			if( !symbol )
			{
				symbol = state.GetSymbolTable().LookupBuffer( name );
				isCBuffer = true;
			}
			if( symbol && symbol->type.IsStruct() )
			{
				isCBuffer = true;
			}
		}
		if( !symbol )
		{
			state.ShowMessage( input.fileLocation, EC_UNDECLARED_IDENTIFIER, ToString( name ).c_str() );
			return {};
		}
		auto& type = symbol->type;
		if( !isCBuffer && !type.IsTexture() && !type.IsSampler() && !type.IsBuffer() && !( type.symbol == nullptr && type.builtInType == OP_RAYTRACING_ACCELERATION_STRUCTURE ) )
		{
			state.ShowMessage( input.fileLocation, EC_CUSTOM_ERROR, "Unsupported type for \"%s\" in the globalinput", ToString( name ).c_str() );
			return {};
		}
		result.push_back( { type, symbol->name, symbol->definition, symbol } );
	}