Flags used for SDLLogLevel to provide correct enum values. This is purely for internal use.
Error level logging
SDLLogFlagError = 1 << 0
static var error: SDLLogFlag { get }
Warning level logging
SDLLogFlagWarning = 1 << 1
static var warning: SDLLogFlag { get }
Debug level logging
SDLLogFlagDebug = 1 << 2
static var debug: SDLLogFlag { get }
Verbose level logging
SDLLogFlagVerbose = 1 << 3
static var verbose: SDLLogFlag { get }