Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_SetJoystickVirtualAxis - Set the state of an axis on an opened virtual joystick.
SYNOPSIS
#include <SDL3/SDL_joystick.h>
bool SDL_SetJoystickVirtualAxis(SDL_Joystick *joystick, int axis, Sint16 value);
DESCRIPTION
Please note that values set here will not be applied until the next call to SDL_UpdateJoysticks, which
can either be called directly, or can be called indirectly through various other SDL APIs, including, but
not limited to the following: SDL_PollEvent, SDL_PumpEvents, SDL_WaitEventTimeout, SDL_WaitEvent.
Note that when sending trigger axes, you should scale the value to the full range of Sint16. For
example, a trigger at rest would have the value of SDL_JOYSTICK_AXIS_MIN.
FUNCTION PARAMETERS
joystick
the virtual joystick on which to set state.
axis the index of the axis on the virtual joystick to update.
value the new value for the specified axis.
RETURN VALUE
for more information.
AVAILABILITY
This function is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.20 SDL_SetJoystickVirtualAxis(3)