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add optional stupid framedrop via -D cmd line arg

--- a/main.c

+++ b/main.c

@@ -20,6 +20,7 @@

 static char info[256];

 static int showinfo;

 static uvlong delay;

+static int framedrop;

 static void

 audioproc(void *x)

@@ -52,6 +53,13 @@

 	uvlong x, end, left;

 	Rectangle r, clip;

+	if(lastframe == 0)

+		lastframe = nanosec();

+

+	end = lastframe + f->dt - delay;

+	if(framedrop && delay > 0 && nanosec() >= end+delay)

+		goto drop;

+

 	lockdisplay(display);

 	if(curim != nil && (Dx(curim->r) != f->w || Dy(curim->r) != f->h)){

@@ -63,10 +71,6 @@

 		curim = allocimage(display, r, RGB24, 0, DNofill);

 	loadimage(curim, r, f->rgb, f->w*f->h*3);

-	if(lastframe == 0)

-		lastframe = nanosec();

-

-	end = lastframe + f->dt - delay;

 	while(1){

 		x = nanosec();

 		if(x >= end)

@@ -95,10 +99,12 @@

 		stringbg(screen, screen->r.min, display->white, ZP, font, info, display->black, ZP);

 	flushimage(display, 1);

 	unlockdisplay(display);

+

+	delay = nanosec() - x;

+drop:

 	if(audiosync != nil)

 		sendp(audiosync, nil);

-	delay = nanosec() - x;

 	lastframe += f->dt;

 	free(f);

@@ -151,6 +157,9 @@

 			usage();

 		}

 		audio = EARGF(usage());

+		break;

+	case 'D':

+		framedrop++;

 		break;

 	case 'd':

 		debug++;