Index - U
| UnacceleratedRenderer | Reflex.SDL2 |
| unit | Reflex.SDL2 |
| unital | Reflex.SDL2 |
| unitalRep | Reflex.SDL2 |
| Unknown | Reflex.SDL2 |
| UnknownEvent | Reflex.SDL2 |
| UnknownEventData | |
| 1 (Data Constructor) | Reflex.SDL2 |
| 2 (Type/Class) | Reflex.SDL2 |
| unknownEventType | Reflex.SDL2 |
| UnknownPowerState | Reflex.SDL2 |
| Unlocked | Reflex.SDL2 |
| unlockSurface | Reflex.SDL2 |
| unlockTexture | Reflex.SDL2 |
| unP | Reflex.SDL2 |
| unReflexSDL2T | Reflex.SDL2.Base |
| Unsigned16BitBEAudio | Reflex.SDL2 |
| Unsigned16BitLEAudio | Reflex.SDL2 |
| Unsigned16BitNativeAudio | Reflex.SDL2 |
| Unsigned8BitAudio | Reflex.SDL2 |
| unwrapKeycode | Reflex.SDL2 |
| unwrapScancode | Reflex.SDL2 |
| updateTexture | Reflex.SDL2 |
| updateWindowSurface | Reflex.SDL2 |
| UserEvent | Reflex.SDL2 |
| userEventCode | Reflex.SDL2 |
| UserEventData | |
| 1 (Data Constructor) | Reflex.SDL2 |
| 2 (Type/Class) | Reflex.SDL2 |
| userEventData1 | Reflex.SDL2 |
| userEventData2 | Reflex.SDL2 |
| userEventType | Reflex.SDL2 |
| userEventWindow | Reflex.SDL2 |
| UYVY | Reflex.SDL2 |