Simple debug logging macros for Unreal Engine 4.

UnrealLogging.cc

/**
 * Log a green debug message in the corner of the game screen. Generally
 * used for situations in which an operation has completed successfully.
 */
#define BL_LOG_GREEN(str) (GEngine->AddOnScreenDebugMessage(-1, 5.f, \
                                                            FColor::Green, \
                                                            TEXT(str)))

/**
 * Log a yellow debug message in the corner of the game screen. Generally
 * used for warnings that aren't necessarily crucial.
 */
#define BL_LOG_YELLOW(str) (GEngine->AddOnScreenDebugMessage(-1, 5.f, \
                                                             FColor::Yellow, \
                                                             TEXT(str)))

/**
 * Log a blue debug message in the corner of the game screen. Generally
 * used for basic information that isn't necessarily important.
 */
#define BL_LOG_BLUE(str) (GEngine->AddOnScreenDebugMessage(-1, 5.f, \
                                                           FColor::Blue, \
                                                           TEXT(str)))

/**
 * Log a red debug message in the corner of the game screen. Generally
 * used for situations when an operation fails badly (e.g. an error that
 * shouldn't be showing up).
 */
#define BL_LOG_RED(str) (GEngine->AddOnScreenDebugMessage(-1, 5.f, \
                                                          FColor::Red, \
                                                          TEXT(str)))