SDL_RenderEvent.3type - Man Page

#include <SDL3/SDL_events.h>

typedef struct SDL_RenderEvent
{
    SDL_EventType type; /**< SDL_EVENT_RENDER_TARGETS_RESET, SDL_EVENT_RENDER_DEVICE_RESET, SDL_EVENT_RENDER_DEVICE_LOST */
    Uint32 reserved;
    Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
    SDL_WindowID windowID; /**< The window containing the renderer in question. */
} SDL_RenderEvent;

This struct is available since SDL 3.2.0.