Method Open

shadercompiler/CachingIncludeHandler.cpp:88–176

-------------------------------------------------------------------------------------- Description: Loads an included file. Arguments: fileName - File name to include (can be relative to parent path) parentData - Contents of the parent file as returned by a previous call to Open; used for resolving relative paths rootPath - Custom root path for resolving relative paths ----------------------------

//   rootPath - Custom root path for resolving relative paths
// --------------------------------------------------------------------------------------
std::optional<CachingIncludeHandler::IncludedFile> CachingIncludeHandler::Open( const char* fileName, const char* parentData, const char* rootPath )
{
	std::lock_guard scope( m_cs );

	std::string fullPath;
	if( PathIsRelative( fileName ) )
	{
		std::string parentPath;
		if( parentData == nullptr )
		{
			parentPath = rootPath ? rootPath : m_rootPath;
		}
		else
		{
			auto parent = m_pathFromFile.find( parentData - 1 );
			if( parent != m_pathFromFile.end() )
			{
				parentPath = parent->second;
			}
			else
			{
				parentPath = "";
			}
		}
		if( auto joined = JoinPath( parentPath.c_str(), fileName ) )
		{
			fullPath = *joined;
		}
		else
		{
			return std::nullopt;
		}
	}
	else
	{
		fullPath = fileName;
	}
	auto fileFromPath = m_fileFromPath.find( fullPath );
	if( fileFromPath != m_fileFromPath.end() )
	{
		return fileFromPath->second;
	}

	IncludedFile info;
	info.fullPath = fullPath;

	FILE* file = nullptr;
	fopen_s( &file, fullPath.c_str(), "rb" );
	if( !file )
	{
		return std::nullopt;
	}

	size_t fileSize = 0;
	struct stat buf;
	if( stat( fullPath.c_str(), &buf ) == 0 )
	{
		info.modifiedTime = buf.st_mtime;