NAME

SDL2::haptic - SDL Haptic Subsystem Allowing You to Control Haptic (Force Feedback) Devices

SYNOPSIS

use SDL2 qw[:haptic];

DESCRIPTION

The SDL haptic subsystem allows you to control haptic (force feedback) devices.

The basic usage is as follows:

- Initialize the subsystem (SDL_INIT_HAPTIC).

- Open a haptic device.

- SDL_HapticOpen( ... ) to open from index.
- SDL_HapticOpenFromJoystick( ... ) to open from an existing joystick.

- Create an effect (SDL_HapticEffect).

- Upload the effect with SDL_HapticNewEffect( ... ).

- Run the effect with SDL_HapticRunEffect( ... ).

- (optional) Free the effect with SDL_HapticDestroyEffect( ... ).

- Close the haptic device with SDL_HapticClose( ... ).

Simple rumble example:

# Open the device
my $haptic = SDL_HapticOpen( 0 );
$haptic // return -1;

# Initialize simple rumble
return -1 if SDL_HapticRumbleInit( $haptic ) != 0;

# Play effect at 50% strength for 2 seconds
return -1 if SDL_HapticRumblePlay( $haptic, 0.5, 2000 ) != 0;
SDL_Delay( 2000 );

# Clean up
SDL_HapticClose( $haptic );

Complete example:

sub test_haptic ($joystick) {
    my $effect_id;

    # Open the device
    my $haptic = SDL_HapticOpenFromJoystick($joystick);
    $haptic // return -1;    # Most likely joystick isn't haptic

    # See if it can do sine waves
    if ( ( SDL_HapticQuery($haptic) & SDL_HAPTIC_SINE ) == 0 ) {
        SDL_HapticClose($haptic);    # No sine effect
        return -1;
    }

    # Create the effect
    my $effect = SDL2::HapticEffect->new();
    $effect->type(SDL_HAPTIC_SINE);
    $effect->periodic->direction->type(SDL_HAPTIC_POLAR);   # Polar coordinates
    $effect->periodic->direction->dir->[0] = 18000;         # Force comes from south
    $effect->periodic->period(1000);                        # 1000 ms
    $effect->periodic->magnitude(20000);                    # 20000/32767 strength
    $effect->periodic->length(5000);                        # 5 seconds long
    $effect->periodic->attack_length(1000);                 # Takes 1 second to get max strength
    $effect->periodic->fade_length(1000);                   # Takes 1 second to fade away

    #  Upload the effect
    $effect_id = SDL_HapticNewEffect( $haptic, \$effect );

    # Test the effect
    SDL_HapticRunEffect( $haptic, $effect_id, 1 );
    SDL_Delay(5000);                                        # Wait for the effect to finish

    # We destroy the effect, although closing the device also does this
    SDL_HapticDestroyEffect( $haptic, $effect_id );

    # Close the device
    SDL_HapticClose($haptic);
    return 0;                                               # Success
}

Functions

These may be imported by name or with the :haptic tag.

`SDL_NumHaptics( ... )`

Count the number of haptic devices attached to the system.

Returns the number of haptic devices detected on the system or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticName( ... )`

Get the implementation dependent name of a haptic device.

This can be called before any joysticks are opened. If no name can be found, this function returns undef.

Expected parameters include:

device_index - index of the device to query

Returns the name of the device or undef on failure; call SDL_GetError( ) for more information.

`SDL_HapticOpen( ... )`

Open a haptic device for use.

The index passed as an argument refers to the N'th haptic device on this system.

When opening a haptic device, its gain will be set to maximum and autocenter will be disabled. To modify these values use SDL_HapticSetGain( ... ) and SDL_HapticSetAutocenter( ... ).

Expected parameters include:

device_index - index of the device to open

Returns the device identifier or undef on failure; call SDL_GetError( ) for more information.

`SDL_HapticOpened( ... )`

Check if the haptic device at the designated index has been opened.

Expected parameters include:

device_index - the index of the device to query

Returns 1 if it has been opened, 0 if it hasn't or on failure; call SDL_GetError( ) for more information.

`SDL_HapticIndex( ... )`

Get the index of a haptic device.

Expected parameters include:

haptic - the SDL2::Haptic device to query

Returns the index of the specified haptic device or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_MouseIsHaptic( )`

Query whether or not the current mouse has haptic capabilities.

Returns SDL_TRUE if the mouse is haptic or SDL_FALSE if it isn't.

`SDL_HapticOpenFromMouse( )`

Try to open a haptic device from the current mouse.

Returns the haptic device identifier or undef on failure; call SDL_GetError( ) for more information.

`SDL_JoystickIsHaptic( ... )`

Query if a joystick has haptic features.

Expected parameters include:

joystick - the SDL2::Joystick to test for haptic capabilities

Returns SDL_TRUE if the joystick is haptic, SDL_FALSE if it isn't, or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticOpenFromJoystick( ... )`

Open a haptic device for use from a joystick device.

You must still close the haptic device separately. It will not be closed with the joystick.

When opened from a joystick you should first close the haptic device before closing the joystick device. If not, on some implementations the haptic device will also get unallocated and you'll be unable to use force feedback on that device.

Expected parameters include:

joystick - the SDL2::Joystick to create a haptic device from

Returns a valid haptic device identifier on success or undef on failure; call SDL_GetError( ) for more information.

`SDL_HapticClose( ... )`

Close a haptic device previously opened with SDL_HapticOpen().

Expected parameters include:

haptic - the SDL2::Haptic device to close

`SDL_HapticNumEffects( ... )`

Get the number of effects a haptic device can store.

On some platforms this isn't fully supported, and therefore is an approximation. Always check to see if your created effect was actually created and do not rely solely on SDL_HapticNumEffects().

Expected parameters include:

haptic - the SDL2::Haptic device to query

Returns the number of effects the haptic device can store or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticNumEffectsPlaying( ... )`

Get the number of effects a haptic device can play at the same time.

This is not supported on all platforms, but will always return a value.

Expected parameters include:

haptic - the SDL2::Haptic device to query maximum playing effects

Returns the number of effects the haptic device can play at the same time or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticQuery( ... )`

Get the haptic device's supported features in bitwise manner.

Expected parameters include:

haptic - the SDL2::Haptic device to query

Returns a list of supported haptic features in bitwise manner (OR'd), or 0 on failure; call SDL_GetError( ) for more information.

`SDL_HapticNumAxes( ... )`

Get the number of haptic axes the device has.

The number of haptic axes might be useful if working with the SDL2::HapticDirection effect.

Expected parameters include:

haptic - the SDL2::Haptic device to query

Returns the number of axes on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticEffectSupported( ... )`

Check to see if an effect is supported by a haptic device.

Expected parameters include:

haptic - the SDL2::Haptic device to query
effect - the desired effect to query

Returns SDL_TRUE if effect is supported, SDL_FALSE if it isn't, or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticNewEffect( ... )`

Create a new haptic effect on a specified device.

Expected parameters include:

haptic - an SDL2::Haptic device to create the effect on
effect - an SDL2::HapticEffect structure containing the properties of the effect to create

Returns the ID of the effect on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticUpdateEffect( ... )`

Update the properties of an effect.

Can be used dynamically, although behavior when dynamically changing direction may be strange. Specifically the effect may re-upload itself and start playing from the start. You also cannot change the type either when running SDL_HapticUpdateEffect( ... ).

Expected parameters include:

haptic - the SDL2::Haptic device that has the effect
effect - the identifier of the effect to update
data - an SDL2::HapticEffect structure containing the new effect properties to use

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticRunEffect( ... )`

Run the haptic effect on its associated haptic device.

To repeat the effect over and over indefinitely, set iterations to SDL_HAPTIC_INFINITY. (Repeats the envelope - attack and fade.) To make one instance of the effect last indefinitely (so the effect does not fade), set the effect's `length` in its structure/union to SDL_HAPTIC_INFINITY instead.

Expected parameters include:

haptic - the SDL2::Haptic device to run the effect on
effect - the ID of the haptic effect to run
iterations - the number of iterations to run the effect; use SDL_HAPTIC_INFINITY to repeat forever

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticStopEffect( ... )`

Stop the haptic effect on its associated haptic device.

Expected parameters include:

haptic - the SDL_Haptic device to stop the effect on
effect - the ID of the haptic effect to stop

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticDestroyEffect( ... )`

Destroy a haptic effect on the device.

This will stop the effect if it's running. Effects are automatically destroyed when the device is closed.

Expected parameters include:

haptic - the SDL2::Haptic device to destroy the effect on
effect - the ID of the haptic effect to destroy

`SDL_HapticGetEffectStatus( ... )`

Get the status of the current effect on the specified haptic device.

Device must support the SDL_HAPTIC_STATUS feature.

Expected parameters include:

haptic - the SDL2::Haptic device to query for the effect status on
effect - the ID of the haptic effect to query its status

Returns 0 if it isn't playing, 1 if it is playing, or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticSetGain( ... )`

Set the global gain of the specified haptic device.

Device must support the SDL_HAPTIC_GAIN feature.

The user may specify the maximum gain by setting the environment variable SDL_HAPTIC_GAIN_MAX which should be between 0 and 100. All calls to SDL_HapticSetGain( ... ) will scale linearly using SDL_HAPTIC_GAIN_MAX as the maximum.

Expected parameters include:

haptic - the SDL2::Haptic device to set the gain on
gain - value to set the gain to, should be between 0 and 100

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticSetAutocenter( ... )`

Set the global autocenter of the device.

Autocenter should be between 0 and 100. Setting it to 0 will disable autocentering.

Device must support the SDL_HAPTIC_AUTOCENTER feature.

Expected parameters include:

haptic - the SDL2::Haptic device to set autocentering on
autocenter - value to set autocenter to (0-100)

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticPause( ... )`

Pause a haptic device.

Device must support the SDL_HAPTIC_PAUSE feature. Call SDL_HapticUnpause( ... ) to resume playback.

Do not modify the effects nor add new ones while the device is paused. That can cause all sorts of weird errors.

Expected parameters include:

haptic - the SDL2::Haptic device to pause

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticUnpause( ... )`

Unpause a haptic device.

Call to unpause after SDL_HapticPause( ... ).

Expected parameters include:

haptic - the SDL2::Haptic device to unpause

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticStopAll( ... )`

Stop all the currently playing effects on a haptic device.

Expected parameters include:

haptic - the SDL2::Haptic device to stop

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticRumbleSupported( ... )`

Check whether rumble is supported on a haptic device.

Expected parameters include:

haptic - haptic device to check for rumble support

Returns SDL_TRUE if effect is supported, SDL_FALSE if it isn't, or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticRumbleInit( ... )`

Initialize a haptic device for simple rumble playback.

Expected parameters include:

haptic - the haptic device to initialize for simple rumble playback

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticRumblePlay( ... )`

Run a simple rumble effect on a haptic device.

Expected parameters include:

haptic - the haptic device to play the rumble effect on
strength - strength of the rumble to play as a 0-1 float value
length - length of the rumble to play in milliseconds

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

`SDL_HapticRumbleStop( ... )`

Stop the simple rumble on a haptic device.

Expected parameters include:

haptic - the haptic device to stop the rumble effect on

Returns 0 on success or a negative error code on failure; call SDL_GetError( ) for more information.

Defined Values and Enumerations

These may be imported by name or with the given tag.

Haptic Features

Different haptic features a device can have. These values may all be imported with the :haptic tag.

Haptic effects

SDL_HAPTIC_CONSTANT - Constant haptic effect
SDL_HAPTIC_SINE - Periodic haptic effect that simulates sine waves
SDL_HAPTIC_LEFTRIGHT - Haptic effect for direct control over high/low frequency motors
SDL_HAPTIC_TRIANGLE - Periodic haptic effect that simulates triangular waves
SDL_HAPTIC_SAWTOOTHUP - Periodic haptic effect that simulates saw tooth up waves
SDL_HAPTIC_SAWTOOTHDOWN - Periodic haptic effect that simulates saw tooth down waves
SDL_HAPTIC_RAMP - Ramp haptic effect
SDL_HAPTIC_SPRING - Condition haptic effect that simulates a spring. Effect is based on the axes position
SDL_HAPTIC_DAMPER - Condition haptic effect that simulates dampening. Effect is based on the axes velocity
SDL_HAPTIC_INERTIA - Condition haptic effect that simulates inertia. Effect is based on the axes acceleration
SDL_HAPTIC_FRICTION - Condition haptic effect that simulates friction. Effect is based on the axes movement
SDL_HAPTIC_CUSTOM - User defined custom haptic effect

These last few are features the device has, not effects:

SDL_HAPTIC_GAIN - Device supports setting the global gain
SDL_HAPTIC_AUTOCENTER - Device supports setting autocenter
SDL_HAPTIC_STATUS - Device supports querying effect status
SDL_HAPTIC_PAUSE - Devices supports being paused

Direction encodings

SDL_HAPTIC_POLAR - Uses polar coordinates for the direction
SDL_HAPTIC_CARTESIAN - Uses cartesian coordinates for the direction
SDL_HAPTIC_SPHERICAL - Uses spherical coordinates for the direction
SDL_HAPTIC_STEERING_AXIS - Use this value to play an effect on the steering wheel axis. This provides better compatibility across platforms and devices as SDL will guess the correct axis

Misc defines

SDL_HAPTIC_INFINITY - Used to play a device an infinite number of times

LICENSE

This library is free software; you can redistribute it and/or modify it under the terms found in the Artistic License 2. Other copyrights, terms, and conditions may apply to data transmitted through this module.

AUTHOR

Sanko Robinson <sanko@cpan.org>

To install SDL2::FFI, copy and paste the appropriate command in to your terminal.

cpanm

cpanm SDL2::FFI

CPAN shell

perl -MCPAN -e shell
install SDL2::FFI

For more information on module installation, please visit the detailed CPAN module installation guide.

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NAME

SYNOPSIS

DESCRIPTION

Functions

SDL_NumHaptics( ... )

SDL_HapticName( ... )

SDL_HapticOpen( ... )

SDL_HapticOpened( ... )

SDL_HapticIndex( ... )

SDL_MouseIsHaptic( )

SDL_HapticOpenFromMouse( )

SDL_JoystickIsHaptic( ... )

SDL_HapticOpenFromJoystick( ... )

SDL_HapticClose( ... )

SDL_HapticNumEffects( ... )

SDL_HapticNumEffectsPlaying( ... )

SDL_HapticQuery( ... )

SDL_HapticNumAxes( ... )

SDL_HapticEffectSupported( ... )

SDL_HapticNewEffect( ... )

SDL_HapticUpdateEffect( ... )

SDL_HapticRunEffect( ... )

SDL_HapticStopEffect( ... )

SDL_HapticDestroyEffect( ... )

SDL_HapticGetEffectStatus( ... )

SDL_HapticSetGain( ... )

SDL_HapticSetAutocenter( ... )

SDL_HapticPause( ... )

SDL_HapticUnpause( ... )

SDL_HapticStopAll( ... )

SDL_HapticRumbleSupported( ... )

SDL_HapticRumbleInit( ... )

SDL_HapticRumblePlay( ... )

SDL_HapticRumbleStop( ... )

Defined Values and Enumerations

Haptic Features

Haptic effects

Direction encodings

Misc defines

LICENSE

AUTHOR

Module Install Instructions

`SDL_NumHaptics( ... )`

`SDL_HapticName( ... )`

`SDL_HapticOpen( ... )`

`SDL_HapticOpened( ... )`

`SDL_HapticIndex( ... )`

`SDL_MouseIsHaptic( )`

`SDL_HapticOpenFromMouse( )`

`SDL_JoystickIsHaptic( ... )`

`SDL_HapticOpenFromJoystick( ... )`

`SDL_HapticClose( ... )`

`SDL_HapticNumEffects( ... )`

`SDL_HapticNumEffectsPlaying( ... )`

`SDL_HapticQuery( ... )`

`SDL_HapticNumAxes( ... )`

`SDL_HapticEffectSupported( ... )`

`SDL_HapticNewEffect( ... )`

`SDL_HapticUpdateEffect( ... )`

`SDL_HapticRunEffect( ... )`

`SDL_HapticStopEffect( ... )`

`SDL_HapticDestroyEffect( ... )`

`SDL_HapticGetEffectStatus( ... )`

`SDL_HapticSetGain( ... )`

`SDL_HapticSetAutocenter( ... )`

`SDL_HapticPause( ... )`

`SDL_HapticUnpause( ... )`

`SDL_HapticStopAll( ... )`

`SDL_HapticRumbleSupported( ... )`

`SDL_HapticRumbleInit( ... )`

`SDL_HapticRumblePlay( ... )`

`SDL_HapticRumbleStop( ... )`