PSP2: Improved controller rumble

CHANGES

@@ -23,6 +23,7 @@ Misc:
  - GBA Video: Allow multiple handles into the same tile cache
  - VFS: Call msync when syncing mapped data
  - GBA Video, GB Video: Colors are now fully scaled
+ - PSP2: Improved controller rumble
 
 0.5.1: (2016-10-05)
 Bugfixes:

src/platform/psp2/psp2-context.c

@@ -134,9 +134,11 @@ static void _setRumble(struct mRumble* source, int enable) {
 		rumble->current -= oldLevel;
 	}
 	CircleBufferWrite8(&rumble->history, enable);
+	int small = (rumble->current << 21) / 65793;
+	int big = ((rumble->current * rumble->current) << 18) / 65793;
 	struct SceCtrlActuator state = {
-		rumble->current * 31,
-		0
+		small,
+		big
 	};
 	sceCtrlSetActuator(1, &state);
 }