sdl_runtime_compiler git · main

/* game_mod_abi.h
 *
 * The contract between the engine and a player-built dynamic library.
 *
 * This header is included BOTH by the engine (to read the result) and is
 * emitted verbatim into the user's generated source (so their game_build()
 * agrees on the struct layout). Keep it pure C — no C++ — so the layout is
 * stable across the dlopen boundary regardless of how either side is built.
 *
 * IMPORTANT (security): the engine compiles and dlopen()s code the player
 * typed on the editor wall. This is acceptable ONLY because it is a local,
 * single-player sandbox where the player can affect nothing but their own
 * process. Never feed untrusted or networked input through this path.
 */
#ifndef GAME_MOD_ABI_H
#define GAME_MOD_ABI_H

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    DYN_TEXT = 0,
    DYN_BOX  = 1
} DynObjKind;

/* A flat, POD description of one object to spawn. No pointers, no C++:
 * the library fills these in, the engine constructs the real Text::Token::Data /
 * SolidBox from them. Nothing the library allocates outlives dlclose(). */
typedef struct {
    int    kind;          /* DynObjKind */
    int    dynamic;
    double x, y, z;       /* world position (centre) */
    double hx, hy, hz;    /* half-extents — BOX only; ignored for TEXT */
    float  r, g, b;       /* colour 0..1 */
    char   text[64];      /* TEXT only, null-terminated; ignored for BOX */
} DynObject;

/* The user's compiled library MUST export this symbol.
 * Fills `out` (capacity `max` entries) and returns the number written.
 * Returning more than `max` is undefined; the engine passes a generous max. */
int game_build(DynObject* out, int max);

#ifdef __cplusplus
}
#endif

#endif /* GAME_MOD_ABI_H */