Record Class SDL_HapticEffect

java.lang.Object
java.lang.Record
club.doki7.sdl3.datatype.SDL_HapticEffect
All Implemented Interfaces:
IPointer, ISDL_HapticEffect
@ValueBasedCandidate @UnsafeConstructor public record SDL_HapticEffect(@NotNull MemorySegment segment) extends Record implements ISDL_HapticEffect

The generic template for any haptic effect.

All values max at 32767 (0x7FFF). Signed values also can be negative. Time values unless specified otherwise are in milliseconds.

You can also pass SDL_HAPTIC_INFINITY to length instead of a 0-32767 value. Neither delay, interval, attack_length nor fade_length support SDL_HAPTIC_INFINITY. Fade will also not be used since effect never ends.

Additionally, the SDL_HAPTIC_RAMP effect does not support a duration of SDL_HAPTIC_INFINITY.

Button triggers may not be supported on all devices, it is advised to not use them if possible. Buttons start at index 1 instead of index 0 like the joystick.

If both attack_length and fade_level are 0, the envelope is not used, otherwise both values are used.

Common parts:

 // Replay - All effects have this
 Uint32 length;        // Duration of effect (ms).
 Uint16 delay;         // Delay before starting effect.

 // Trigger - All effects have this
 Uint16 button;        // Button that triggers effect.
 Uint16 interval;      // How soon before effect can be triggered again.

 // Envelope - All effects except condition effects have this
 Uint16 attack_length; // Duration of the attack (ms).
 Uint16 attack_level;  // Level at the start of the attack.
 Uint16 fade_length;   // Duration of the fade out (ms).
 Uint16 fade_level;    // Level at the end of the fade.

Here we have an example of a constant effect evolution in time:

 Strength
 ^
 |
 |    effect level -->  _________________
 |                     /                 \
 |                    /                   \
 |                   /                     \
 |                  /                       \
 | attack_level --> |                        \
 |                  |                        |  <---  fade_level
 |
 +--------------------------------------------------> Time
                    [--]                 [---]
                    attack_length        fade_length

 [------------------][-----------------------]
 delay               length

Note either the attack_level or the fade_level may be above the actual effect level.

\since This struct is available since SDL 3.2.0.

\sa SDL_HapticConstant \sa SDL_HapticPeriodic \sa SDL_HapticCondition \sa SDL_HapticRamp \sa SDL_HapticLeftRight \sa SDL_HapticCustom

Structure

typedef struct SDL_HapticEffect {
    Uint16 type;
    SDL_HapticConstant constant;
    SDL_HapticPeriodic periodic;
    SDL_HapticCondition condition;
    SDL_HapticRamp ramp;
    SDL_HapticLeftRight leftright;
    SDL_HapticCustom custom;
} SDL_HapticEffect;

Contracts

The property segment() should always be not-null (segment != NULL && !segment.equals(MemorySegment.NULL)), and properly aligned to LAYOUT.byteAlignment() bytes. To represent null pointer, you may use a Java null instead. See the documentation of IPointer.segment() for more details.

The constructor of this class is marked as UnsafeConstructor, because it does not perform any runtime check. The constructor can be useful for automatic code generators.