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_SetHapticGain() will scale linearly using SDL_HAPTIC_GAIN_MAX as the
maximum.
\param haptic the SDL_Haptic device to set the gain on.
\param gain value to set the gain to, should be between 0 and 100 (0 -
100).
\returns true on success or false on failure; call SDL_GetError() for more
information.
\since This function is available since SDL 3.2.0.
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_SetHapticGain() will scale linearly using SDL_HAPTIC_GAIN_MAX as the maximum.
\param haptic the SDL_Haptic device to set the gain on. \param gain value to set the gain to, should be between 0 and 100 (0 - 100). \returns true on success or false on failure; call SDL_GetError() for more information.
\since This function is available since SDL 3.2.0.
\sa SDL_GetHapticFeatures