Man page - sdl_init_interface(3)

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SDL_INIT_INTERFACE - A macro to initialize an SDL interface.

Defined in SDL3/SDL_stdinc.h

#include "SDL3/SDL.h"

#define SDL_INIT_INTERFACE(iface) .BI do { .BI SDL_zerop(iface); .BI (iface)->version = sizeof(*(iface)); .BI } while (0)

This macro will initialize an SDL interface structure and should be called before you fill out the fields with your implementation.

You can use it like this:

SDL_IOStreamInterface iface;

SDL_INIT_INTERFACE(&iface);

// Fill in the interface function pointers with your implementation
iface.seek = ...

stream = SDL_OpenIO(&iface, NULL);

If you are using designated initializers, you can use the size of the interface as the version, e.g.

SDL_IOStreamInterface iface = {
.version = sizeof(iface),
.seek = ...
};
stream = SDL_OpenIO(&iface, NULL);

It is safe to call this macro from any thread.

This macro is available since SDL 3.2.0.