Man page - sdl_ns_per_ms(3)

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Manual

SDL_NS_PER_MS(3) SDL3 FUNCTIONS SDL_NS_PER_MS(3)

SDL_NS_PER_MS - Number of nanoseconds in a millisecond.

Defined in SDL3/SDL_timer.h

#include "SDL3/SDL.h"
#define SDL_NS_PER_MS       1000000

This is always 1000000.

This macro is available since SDL 3.2.0.

SDL 3.2.10 Simple Directmedia Layer