typedef struct Meta Meta;typedef struct UI UI; struct Meta {	const char *k;	const char *v;}; struct UI {	int type;	const char *label;	float *zone;	float init;	float min;	float max;	float step; 	Meta *meta;	int nummeta; 	int autovoice;	int crossvoice; 	/* optional */	char *(*readstr)(UI *ui, int auxtype, char *s, int sz);	int (*writestr)(UI *ui, int auxtype, char *s);	void *userdata;}; char *ui_readstr(UI *ui, int auxtype, char *s, int sz);int ui_writestr(UI *ui, int auxtype, char *s); void ui_tgroup(const char *label);void ui_hgroup(const char *label);void ui_vgroup(const char *label);void ui_endgroup(void);UI *ui_button(const char *label, float *zone);UI *ui_checkbox(const char *label, float *zone);UI *ui_vslider(const char *label, float *zone, float init, float min, float max, float step);UI *ui_hslider(const char *label, float *zone, float init, float min, float max, float step);UI *ui_nentry(const char *label, float *zone, float init, float min, float max, float step);UI *ui_hbargraph(const char *label, float *zone, float min, float max);UI *ui_vbargraph(const char *label, float *zone, float min, float max);void ui_declare(float *zone, const char *key, const char *value);