#include <u.h>#include <libc.h>#include <thread.h>#include <draw.h>#include <mouse.h>#include <nuklear.h> #include "fns.h" int mainstacksize = 128*1024; voidusage(void){	fprint(2, "usage: %s\n", argv0);	threadexitsall("usage");} voidkbdthread(void *v){	int fd;	long n;	Channel *c;	Ioproc *io;	IOchunk chk; 	c = v;	io = ioproc(); 	if((fd = ioopen(io, "/dev/kbd", OREAD)) < 0)		sysfatal("open: %r"); 	for(;;){		chk.addr = malloc(64);		if(chk.addr == nil)			sysfatal("malloc: %r"); 		n = ioread(io, fd, chk.addr, 64);		if(n < 0)			sysfatal("read: %r"); 		chk.len = n; 		send(c, &chk);	}} voidtimerthread(void *v){	Channel *c;	Ioproc *io;	vlong t; 	static long sleepms = 100; 	c = v;	io = ioproc();	for(;;){		iosleep(io, sleepms);		t = nsec();		send(c, &t);	}} voidthreadmain(int argc, char *argv[]){	vlong t;	IOchunk kbdchk;	Channel *kbd, *timer;	Mouse m;	Mousectl *mctl; 	struct nk_user_font nkfont;	struct nk_context sctx;	struct nk_context *ctx = &sctx; 	ARGBEGIN{	default:		usage();	}ARGEND 	if(initdraw(nil, nil, "a nuklear demo") < 0)		sysfatal("initdraw: %r"); 	kbd = chancreate(sizeof(IOchunk), 0);	timer = chancreate(sizeof(vlong), 0); 	threadcreate(kbdthread, kbd, 8192);	threadcreate(timerthread, timer, 8192); 	mctl = initmouse(nil, screen); 	/* create nuklear font from default libdraw font */	nk_plan9_makefont(&nkfont, font); 	/* initialize nuklear */	if(!nk_init_default(ctx, &nkfont))		sysfatal("nk_init: %r"); 	enum { ATIMER, AKBD, AMOUSE, ARESIZE, AEND };	Alt alts[] = {	[ATIMER]	{ timer,			&t,			CHANRCV },	[AKBD]		{ kbd,				&kbdchk,	CHANRCV },	[AMOUSE]	{ mctl->c,			&m,			CHANRCV },	[ARESIZE]	{ mctl->resizec,	nil,		CHANRCV },	[AEND]		{ nil,				nil,		CHANEND },	}; 	for(;;){		nk_input_begin(ctx);		switch(alt(alts)){		case ATIMER:			break;		case AKBD:			nk_plan9_handle_kbd(ctx, kbdchk.addr, kbdchk.len);			free(kbdchk.addr);			kbdchk.addr = nil;			break;		case AMOUSE:			nk_plan9_handle_mouse(ctx, m, screen->r.min);			break;		case ARESIZE:			if(getwindow(display, Refnone) < 0)				sysfatal("getwindow: %r");		}		nk_input_end(ctx); 		/* handle usual plan 9 exit key */		if(nk_input_is_key_down(&ctx->input, NK_KEY_DEL))			threadexitsall(nil); 		overview(ctx);		calculator(ctx); 		/* render everything */		draw(screen, screen->r, display->black, nil, ZP);		nk_plan9_render(ctx, screen);		flushimage(display, 1);	} 	threadexitsall(nil);}