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sim: track mobj state, simplify sprite frame selection somewhat

do one-time setup in fs.c after loading everything, to make sure
all sprite pointers are set.
if there's no movement sprite, use idle sprite and vice-versa.
don't do more checks later to simplify things a bit, and don't
have sim.c deciding what to draw.

--- a/dat.h

+++ b/dat.h

@@ -134,7 +134,7 @@

 };

 struct Mobj{

 	Obj *o;

-	Pics *pics;

+	int state;

 	int freezefrm;

 	Point;

 	int px;

--- a/drw.c

+++ b/drw.c

@@ -269,13 +269,8 @@

 	Pics *pp;

 	Pic *p;

-	pp = mo->pics;

-	if(pp->pic != nil)

-		frm = tc % pp->nf;

-	else{

-		pp = &mo->o->state[OSmove].pics;

-		frm = mo->freezefrm;

-	}

+	pp = &mo->o->state[mo->state].pics;

+	frm = mo->state == OSidle ? mo->freezefrm : tc % pp->nf;

 	assert(pp->pic != nil && pp->shadow != nil);

 	θ = mo->θ * 32.0 / 256;

 	switch(pp->nr){

--- a/fs.c

+++ b/fs.c

@@ -590,6 +590,24 @@

 }

 static void

+fixobjspr(void)

+{

+	Obj *o;

+	Pics *idle, *move;

+

+	for(o=obj; o<obj+nobj; o++){

+		idle = &o->state[OSidle].pics;

+		move = &o->state[OSmove].pics;

+		if(idle->pic == nil && move->pic == nil)

+			sysfatal("obj %s: no base sprites loaded", o->name);

+		if(idle->pic == nil)

+			memcpy(idle, move, sizeof *idle);

+		else if(move->pic == nil)

+			memcpy(move, idle, sizeof *move);

+	}

+}

+

+static void

 checkdb(void)

 {

 	if(tileset == nil)

@@ -610,6 +628,7 @@

 	initmap();

 	initmapobj();

 	cleanup();

+	fixobjspr();

 }

 void

--- a/sim.c

+++ b/sim.c

@@ -88,9 +88,8 @@

 {

 	unlinkmobj(mo->movingp);

 	mo->pathp = nil;

-	if(mo->pics->nf > 0)

-		mo->freezefrm = tc % mo->pics->nf;

-	mo->pics = &mo->o->state[OSidle].pics;

+	mo->freezefrm = tc % mo->o->state[mo->state].pics.nf;

+	mo->state = OSidle;

 	resetcoords(mo);

 }

@@ -112,8 +111,7 @@

 	}

 	mo->movingp = linkmobj(moving, mo, mo->movingp);

 	mo->pathp = mo->paths;

-	mo->pics = mo->o->state[OSmove].pics.pic != nil

-		? &mo->o->state[OSmove].pics : &mo->o->state[OSidle].pics;

+	mo->state = OSmove;

 	nextmove(mo);

 	return 0;

 }

@@ -142,7 +140,7 @@

 	if((mo = mapspawn(x, y, o)) == nil)

 		return -1;

 	mo->team = n;

-	mo->pics = &mo->o->state[OSidle].pics;

+	mo->state = OSidle;

 	if(mo->f & Fbuild)

 		team[n].nbuild++;

 	else