Function sdl2_sys::SDL_HapticSetGain

pub unsafe extern "C" fn SDL_HapticSetGain(
    haptic: *mut SDL_Haptic, 
    gain: c_int
) -> c_int

\brief Sets the global gain of the 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.

\param haptic Haptic device to set the gain on. \param gain Value to set the gain to, should be between 0 and 100. \return 0 on success or -1 on error.

\sa SDL_HapticQuery