Oldschool virtual methods

typedef struct {
    void (*systemSleep)(long ms);
    long (*currentTimeMillis)();
    void* (*createPrimarySurface)();
    void* (*createSurface)(int width, int height);
    void (*getSystemPath)(char *buf, char *name);
    void* (*loadSurfaceFromFile)(char * name);
    void (*blitSurface)(void * dest, void * src, int x, int y);
    void (*blitSurfaceRegion)(void * dest, void * src, int x, int y, int dx, int dy, int w, int h);
    void (*flipSurface)(void * surface);
    void (*fillSurfaceRect)(void * surface, int x, int y, int w, int h, int color);
    void (*surfaceClip)(void * surface, int i, int j, int k, int l);
    void (*surfaceAlpha)(void * surface, int alpha);
    int (*getSurfaceWidth)(void * surface);
    int (*getSurfaceHeight)(void * surface);
    int (*processEvents)();
    int (*loadSound)(char *name, int type, int id);
    void (*playSound)(int id, int loops);
    void (*stopSound)(int id);
    void (*freeSound)(int id);
    void (*setSoundVolume)(int id, int volume);
    void (*getDocumentPath)(char *buf, char *name);
    void (*platformRequest)(char *wapLink);
    void (*quit)();
} refexport_t;

typedef struct {
    void (*init)();
    void (*tick)();
    void (*paint)();
    void (*keyPressed)(int code);
    void (*keyReleased)(int code);
    void (*pointerPressed)(int x, int y);
    void (*pointerReleased)(int x, int y);
    void (*pointerDragged)(int x, int y);
    void (*startApp)();
    void (*pauseApp)();
    void (*quit)();
} refimport_t;


//dll exports the only function:
refimport_t * GetRefAPI( int apiVersion, refexport_t *rexp );