Index - I
| identity | Reflex.SDL2 |
| ImmediateUpdates | Reflex.SDL2 |
| improvingMaybe | Reflex.SDL2 |
| Incremental | Reflex.SDL2 |
| incrementalToDynamic | Reflex.SDL2 |
| Index1LSB | Reflex.SDL2 |
| Index1MSB | Reflex.SDL2 |
| Index4LSB | Reflex.SDL2 |
| Index4MSB | Reflex.SDL2 |
| Index8 | Reflex.SDL2 |
| infinitePerspective | Reflex.SDL2 |
| Information | Reflex.SDL2 |
| InitAudio | Reflex.SDL2 |
| InitEvents | Reflex.SDL2 |
| InitFlag | Reflex.SDL2 |
| InitGameController | Reflex.SDL2 |
| InitHaptic | Reflex.SDL2 |
| initialize | Reflex.SDL2 |
| initializeAll | Reflex.SDL2 |
| InitJoystick | Reflex.SDL2 |
| InitTimer | Reflex.SDL2 |
| InitVideo | Reflex.SDL2 |
| InputMotion | Reflex.SDL2 |
| inv22 | Reflex.SDL2 |
| inv33 | Reflex.SDL2 |
| inv44 | Reflex.SDL2 |
| inverseFrustum | Reflex.SDL2 |
| inverseInfinitePerspective | Reflex.SDL2 |
| inverseOrtho | Reflex.SDL2 |
| inversePerspective | Reflex.SDL2 |
| IsHList | Reflex.SDL2 |
| isScreenKeyboardShown | Reflex.SDL2 |
| IYUV | Reflex.SDL2 |