Free Hero Mesh

static Uint8 lastimage_processing,changed,all_flushed;
static Value vstack[VSTACKSIZE];
static int vstackptr;
static const char*traceprefix;
static Uint8 current_key;
static Value quiz_obj;
static Value traced_obj;
static Uint32 control_obj=VOIDLINK;

#define Throw(x) (my_error=(x),longjmp(my_env,1))
#define StackReq(x,y) do{ if(vstackptr<(x)) Throw("Stack underflow"); if(vstackptr-(x)+(y)>=VSTACKSIZE) Throw("Stack overflow"); }while(0)
#define Push(x) (vstack[vstackptr++]=(x))
#define Pop() (vstack[--vstackptr])

// For arrival/departure masks

  if(!((o->oflags|p->oflags)&(OF_VISUALONLY|OF_DESTROYED))) send_message(y,x,MSG_SUNK,NVALUE(0),NVALUE(0),v);
}

static void change_density(Uint32 n,Sint32 v) {
  Object*o=objects[n];
  Uint32 i;
  if(o->oflags&OF_BIZARRO) return;
  if(n==control_obj) {
    o->density=v;
    return;
  }
  if(v<o->density) {
    o->density=v;
    for(;;) {
      i=o->up;
      if(i==VOIDLINK || objects[i]->density<=v) return;
      sink(i,n);
    }

static Uint32 create(Uint32 from,Uint16 c,Uint32 x,Uint32 y,Uint32 im,Uint32 d) {
  Uint32 m,n;
  int i,xx,yy;
  Object*o;
  Object*p;
  Value v;
  if(d>7) d=0;
  if(x<1 || y<1 || x>pfwidth || y>pfheight || c==control_class) return VOIDLINK;
  if(!(classes[c]->oflags&OF_BIZARRO) && (i=classes[c]->collisionLayers) && (xx=collisions_at(x,y)&i)) {
    if(collide_with(xx,VOIDLINK,x,y,c)&0x01) return VOIDLINK;
  }
  n=objalloc(c);
  if(n==VOIDLINK) Throw("Error creating object");
  o=objects[n];
  o->x=x;

}

static Value destroy(Uint32 from,Uint32 to,Uint32 why) {
  Object*o;
  Value v;
  int i,x,y,xx,yy;
  Uint32 n;
  if(to==VOIDLINK || to==control_obj) return NVALUE(0);
  o=objects[to];
  // EKS Hero Mesh doesn't check if it already destroyed.
  v=why==8?NVALUE(0):send_message(from,to,MSG_DESTROY,NVALUE(0),NVALUE(0),NVALUE(why));
  if(!v_bool(v)) {
    if(!(o->oflags&OF_DESTROYED)) {
      if(firstobj==to) firstobj=o->next;
      if(lastobj==to) lastobj=o->prev;

static int move_to(Uint32 from,Uint32 n,Uint32 x,Uint32 y) {
  Uint32 m;
  int i,xx,yy;
  Object*o;
  Object*p;
  Value v;
  if(n==VOIDLINK || (objects[n]->oflags&OF_DESTROYED) || n==control_obj) return 0;
  o=objects[n];
  if(lastimage_processing) Throw("Can't move during animation processing");
  if(x<1 || y<1 || x>pfwidth || y>pfheight) return 0;
  if(v_bool(send_message(from,n,MSG_MOVING,NVALUE(x),NVALUE(y),NVALUE(0)))) return 0;
  if(classes[o->class]->cflags&CF_PLAYER) {
    m=lastobj;
    while(m!=VOIDLINK) {

static int defer_move(Uint32 obj,Uint32 dir,Uint8 plus) {
  Object*o;
  Object*q;
  Uint32 n;
  Value v;
  if(StackProtection()) Throw("Call stack overflow during movement");
  if(obj==VOIDLINK || obj==control_obj) return 0;
  o=objects[obj];
  if(o->oflags&(OF_DESTROYED|OF_BIZARRO)) return 0;
  dir=resolve_dir(obj,dir);
  if(plus) {
    if(o->oflags&OF_MOVING) {
      if(o->dir==dir) return 1;
      v=send_message(VOIDLINK,obj,MSG_CONFLICT,NVALUE(dir),NVALUE(0),NVALUE(0));

  if(current_key) all_flushed=255;
  flush_class(0);
}

static void set_bizarro(Uint32 n,Uint32 v) {
  Object*o;
  Uint8 b;
  if(n==VOIDLINK || n==control_obj) return;
  o=objects[n];
  if(o->oflags&OF_DESTROYED) return;
  if(v) {
    if(o->oflags&OF_BIZARRO) return;
    pfunlink(n);
    o->oflags|=OF_BIZARRO;
    pflink(n);

  Uint8 d=objects[obj]->dir;
  Uint32 n=VOIDLINK;
  Uint32 m;
  Uint16 g;
  Value v;
  static ChoicePoint cp[MAXCHOICE];
  Uint8 cpi=0;
  if(!x) return VOIDLINK;
  cp->depth=vstackptr;
  again: switch(code[ptr++]) {
    case 0 ... 7:
      n=VOIDLINK;
      x+=x_delta[code[ptr-1]];
      y+=y_delta[code[ptr-1]];
      if(x<1 || x>pfwidth || y<1 || y>pfheight) goto fail;

          if(v.u==1) goto fail;
          else if(v.u==2) break;
          else if(v.u) Throw("Invalid return value from message in pattern matching");
        } else if(v.t>TY_MAXTYPE) {
          n=v_object(v);
          x=objects[n]->x;
          y=objects[n]->y;
          if(!x) return VOIDLINK;
        } else {
          Throw("Type mismatch");
        }
        m=objects[m]->up;
      }
      break;
    case OP_ADD:

        d=v.u&7;
      } else if(v.t==TY_MARK) {
        goto fail;
      } else if(v.t>TY_MAXTYPE) {
        n=v_object(v);
        x=objects[n]->x;
        y=objects[n]->y;
        if(!x) return VOIDLINK;
      } else {
        Throw("Type mismatch");
      }
      break;
    case OP_HEIGHT:
      if(playfield[x+y*64-65]==VOIDLINK || height_at(x,y)<=objects[obj]->climb) goto fail;
      break;

    case OP_CLIMB_EC16: NoIgnore(); StackReq(2,0); t1=Pop(); Numeric(t1); i=v_object(Pop()); if(i!=VOIDLINK) o->climb=t1.u&0xFFFF; break;
    case OP_COLLISIONLAYERS: StackReq(0,1); Push(NVALUE(classes[o->class]->collisionLayers)); break;
    case OP_COLLISIONLAYERS_C: StackReq(1,1); i=v_object(Pop()); if(i==VOIDLINK) Push(NVALUE(0)); else Push(NVALUE(classes[objects[i]->class]->collisionLayers)); break;
    case OP_COLOC: StackReq(1,1); t1=Pop(); i=colocation(obj,v_object(t1)); Push(NVALUE(i)); break;
    case OP_COLOC_C: StackReq(2,1); t1=Pop(); t2=Pop(); i=colocation(v_object(t1),v_object(t2)); Push(NVALUE(i)); break;
    case OP_COMPATIBLE: StackReq(0,1); if(classes[o->class]->cflags&CF_COMPATIBLE) Push(NVALUE(1)); else Push(NVALUE(0)); break;
    case OP_COMPATIBLE_C: StackReq(1,1); GetClassFlagOf(CF_COMPATIBLE); break;
    case OP_CONTROL: StackReq(0,1); Push(OVALUE(control_obj)); break;
    case OP_COPYARRAY: NoIgnore(); StackReq(2,0); t2=Pop(); t1=Pop(); v_copy_array(t1,t2); break;
    case OP_COUNT: StackReq(1,2); i=v_count(); Push(NVALUE(i)); break;
    case OP_CREATE: NoIgnore(); StackReq(5,1); t5=Pop(); t4=Pop(); t3=Pop(); t2=Pop(); t1=Pop(); Push(v_create(obj,t1,t2,t3,t4,t5)); break;
    case OP_CREATE_D: NoIgnore(); StackReq(5,0); t5=Pop(); t4=Pop(); t3=Pop(); t2=Pop(); t1=Pop(); v_create(obj,t1,t2,t3,t4,t5); break;
    case OP_DATA: StackReq(2,1); t2=Pop(); t1=Pop(); v_data(t1,t2); break;
    case OP_DELINVENTORY: StackReq(2,0); t2=Pop(); t1=Pop(); v_delete_inventory(t1,t2); break;
    case OP_DELTA: StackReq(2,1); t2=Pop(); Numeric(t2); t1=Pop(); Numeric(t1); Push(NVALUE(t1.u>t2.u?t1.u-t2.u:t2.u-t1.u)); break;

  gameover=0;
  clear_inventory();
  for(i=0;i<nlevelstrings;i++) free(levelstrings[i]);
  nlevelstrings=0;
  free(deadanim);
  deadanim=0;
  ndeadanim=0;
  control_obj=VOIDLINK;
}

static inline int try_sharp(Uint32 n1,Uint32 n2) {
  Object*o=objects[n1];
  Object*p=objects[n2];
  if((o->oflags|p->oflags)&OF_DESTROYED) return 0;
  if(o->dir&1) return 0;

  changed=0;
  key_ignored=0;
  all_flushed=0;
  lastimage_processing=0;
  vstackptr=0;
  move_number=0;
  current_key=0;
  if(control_class) {
    control_obj=objalloc(control_class);
    if(control_obj==VOIDLINK) Throw("Error creating object");
  }
  n=lastobj;
  while(n!=VOIDLINK && !(objects[n]->oflags&OF_ORDERED)) {
    send_message(VOIDLINK,n,MSG_INIT,NVALUE(0),NVALUE(0),NVALUE(0));
    if(classes[objects[n]->class]->order && !(objects[n]->oflags&OF_DESTROYED)) set_order(n);
    n=objects[n]->prev;
  }
  broadcast(VOIDLINK,0,MSG_POSTINIT,NVALUE(0),NVALUE(0),NVALUE(0),0);
  if(gameover) return 0;
  return execute_turn(0);
}