SDL3/SDL_MouseWheelEvent

typedef struct SDL_MouseWheelEvent
{
    SDL_EventType type; /**< ::SDL_EVENT_MOUSE_WHEEL */
    Uint32 reserved;
    Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
    SDL_WindowID windowID; /**< The window with mouse focus, if any */
    SDL_MouseID which;  /**< The mouse instance id, SDL_TOUCH_MOUSEID, or SDL_PEN_MOUSEID */
    float x;            /**< The amount scrolled horizontally, positive to the right and negative to the left */
    float y;            /**< The amount scrolled vertically, positive away from the user and negative toward the user */
    SDL_MouseWheelDirection direction; /**< Set to one of the SDL_MOUSEWHEEL_* defines. When FLIPPED the values in X and Y will be opposite. Multiply by -1 to change them back */
    float mouse_x;      /**< X coordinate, relative to window */
    float mouse_y;      /**< Y coordinate, relative to window */
} SDL_MouseWheelEvent;

(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)

SDL_MouseWheelEvent

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