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implement frameRate() function and set the default framerate to ~90FPS

	this is not very accurate but still good enough

--- a/a.h

+++ b/a.h

@@ -18,6 +18,7 @@

 Image*	color(int, int, int, int);

 extern int		drawing;

+extern int		framerate;

 extern Image	*canvas;

 extern int		width;

 extern int		height;

--- a/api.c

+++ b/api.c

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

 	Chsv,

 };

+int		framerate;

 Image	*canvas;

 int		width;

 int		height;

@@ -23,6 +24,7 @@

 {

 	Rectangle r;

+	framerate = 90;

 	width = 500;

 	height = 500;

 	r = Rect(0, 0, width, height);

@@ -47,6 +49,18 @@

 }

 int

+cframerate(lua_State *L)

+{

+	int n;

+

+	n = luaL_checkinteger(L, 1);

+	if(n < 0)

+		return LUA_ERRRUN;

+	framerate = n;

+	return LUA_OK;

+}

+

+int

 csize(lua_State *L)

 {

 	int w, h;

@@ -380,6 +394,7 @@

 	lset(L, "SQUARE", Endsquare);

 	lset(L, "ROUND", Enddisc);

+	registerfunc(L, "frameRate", cframerate);

 	registerfunc(L, "size", csize);

 	registerfunc(L, "colorMode", ccolormode);

 	registerfunc(L, "background", cbackground);

--- a/slug.c

+++ b/slug.c

@@ -97,6 +97,8 @@

 threadmain(int argc, char *argv[])

 {

 	lua_State *L;

+	vlong t0, t1;

+	double delta;

 	Mouse m;

 	Rune k;

 	Alt alts[] = {

@@ -124,7 +126,12 @@

 	lcall(L, "setup");

 	drawing = 1;

 	for(;;){

+		t0 = nsec();

 		lcall(L, "draw");

+		t1 = nsec();

+		delta = (t1 - t0) / 1000000.0;

+		if(delta > 0.0)

+			sleep((1000.0 / framerate) - delta);

 		switch(alt(alts)){

 		case 0:

 			emouse(L, m);