Free Hero Mesh

* Game engine features
  * Multiple connected objects moving as a unit
  * String data
  * A ,PopUp command to use a popup with arguments starting from a mark
  * "Goto message" instruction (?)
  * Returning a class from COLLIDE/COLLIDEBY to transform
  * Coordinate input (may be suitable for some kind of games)

* Editor
  * Mouse dragging
  * Level index editor
* Table of contents for levels
  * Can define your own columns
  * User can write SQL queries on them
* Deal better with allowing to skip past corrupted levels
* Picture editor/loading
  * Allowing more altimages
  * Spare page (for temporary use while editing)
  * Batch insert multiple dependent image lumps
* Puzzle set catalog format (using with internet; a separate program)
* Inventory/replay hybrid view
* Bookmarks
* Message trace menu to enable/disable
* Bugs
  * Figure out why the $SeekerCloser class doesn't seem to work properly
  * Level 232 of SUPERHRO puzzle set (the Lava shouldn't expand? why?)
  * Animation stopping unexpectedly (until a key is pushed)
* Display solution comments/timestamp
* VCR mode
* Command-line switch for batch import/export levels
* SQL
  * Implement the GROUP column in the CLASSES table
  * Allow multiple SQL statements in one binding
* Large fonts (width 8 or 16, height 8-32)
* Branching replay recording
* Slow movement displaying state between triggers
* Warning if file changed when uncommited data exists in the cache database
* Composite puzzle set format (implemented)
  * Optional hypertext help
  * Compressed class definitions (?)
* Option to auto display level titles
* Testing
  * Bizarro world
  * Deferred movement
  * Sweep, SweepEx, HitMe
  * Overriding order of execution

  }
  if(!norders) ParseError("Empty (Order) block\n");
  orders=realloc(orders,ptr*sizeof(Uint16))?:orders;
}

static void set_class_orders(void) {
  int i,j,k;
  for(i=1;i<undef_class;i++) if(classes[i] && (classes[i]->nmsg || classes[0]->nmsg) || !(classes[i]->cflags&(CF_GROUP|CF_NOCLASS2))) {
    for(j=1;j<norders;j++) {
      k=orders[orders[j]];
      switch(k) {
        case 0x1000 ... 0x101F: if(classes[i]->misc4&(1UL<<(k&0x1F))) goto found; break;
        case 0x1020 ... 0x103F: if(classes[i]->misc5&(1UL<<(k&0x1F))) goto found; break;
        case 0x1040 ... 0x105F: if(classes[i]->misc6&(1UL<<(k&0x1F))) goto found; break;
        case 0x1060 ... 0x107F: if(classes[i]->misc7&(1UL<<(k&0x1F))) goto found; break;

  32 flags can be defined in this way.

(Misc7 <userflags...>)
  Define user flags as Misc7 bits; the first defined flag is bit0. Up to
  32 flags can be defined in this way.

(Order <orders...>)
  See the section below about order of execution. Normally, order of
  execution (for broadcasts and some other things) is in the reverse order
  of creation; the (Order) block allows you to override this order.

(Synchronize <slot> <length> <speed>)
  Define an animation slot for synchronized animation. The slot number can
  be 0 to 7, the length is the number of images in the sequence, and the
  speed is the number of centiseconds between frames.

(Volume <number>)

Trace
  Used for debugging.


=== Order of execution ===





You can specify the order of execution of objects by class by a global
(Order) block. Inside of this block is a list of sub-lists; each sub-list
is delimited by parentheses.

Each sub-list starts with a flag name, which may be a user flag, or Input,
or Player. This matches only classes that have that flag (changing that
flag at run time has no effect on order of execution). The remaining

the values is not a number, then it is an error.

The order of execution is then first all objects not listed in the (Order)
block, and then for each sub-list in the (Order) block, the objects that
meet that criteria, in that order. (If it meets multiple criteria, only
the first one that meets that criteria is used.)

Note: If a value used for the criteria changes after the INIT or CREATE
message of that object returns, then it can result in an unstable (but
still fully deterministic) order when new objects are created. For this
reason, you should only use criteria based on values which don't change.


=== Compatibility ===

Compatible objects have the following differences from the default:

* VisualOnly implies Stealthy.

        destroy(n,e[i],3);
      }
    }
    if(obj_layer_at(b,x,y)!=VOIDLINK) r|=0x01;
  }
  return r;
}

static void set_order(Uint32 obj) {
  // To avoid confusing order of execution at the wrong time,
  // calling this function is limited to only certain times.
  Object*o=objects[obj];
  Uint8 ord=classes[objects[obj]->class]->order;
  Uint8 u;
  Sint32 v0,v1;
  Uint16 p=orders[ord]+1;
  Uint32 n=firstobj;
  for(;;) {
    if(n==obj || n==VOIDLINK) goto notfound;
    u=classes[objects[n]->class]->order;
    if(u<ord) goto found;
    if(u==ord) {
      criteria: switch(orders[p]) {
        case OP_RET: goto found;
        case OP_DENSITY: v0=o->density; v1=objects[n]->density; goto compare;
        case OP_DENSITY_C: v1=o->density; v0=objects[n]->density; goto compare;
        case OP_IMAGE: v0=o->image; v1=objects[n]->image; goto compare;
        case OP_IMAGE_C: v1=o->image; v0=objects[n]->image; goto compare;
        case OP_MISC1:
          if(o->misc1.t || objects[n]->misc1.t) Throw("Type mismatch in order criteria");
          v0=o->misc1.s; v1=objects[n]->misc1.s; goto compare;
        case OP_MISC1_C:
          if(o->misc1.t || objects[n]->misc1.t) Throw("Type mismatch in order criteria");
          v1=o->misc1.s; v0=objects[n]->misc1.s; goto compare;
        case OP_MISC2:
          if(o->misc2.t || objects[n]->misc2.t) Throw("Type mismatch in order criteria");
          v0=o->misc2.s; v1=objects[n]->misc2.s; goto compare;
        case OP_MISC2_C:
          if(o->misc2.t || objects[n]->misc2.t) Throw("Type mismatch in order criteria");
          v1=o->misc2.s; v0=objects[n]->misc2.s; goto compare;
        case OP_MISC3:
          if(o->misc3.t || objects[n]->misc3.t) Throw("Type mismatch in order criteria");
          v0=o->misc3.s; v1=objects[n]->misc3.s; goto compare;
        case OP_MISC3_C:
          if(o->misc3.t || objects[n]->misc3.t) Throw("Type mismatch in order criteria");
          v1=o->misc3.s; v0=objects[n]->misc3.s; goto compare;
        case OP_MISC4:
          if(o->misc4.t || objects[n]->misc4.t) Throw("Type mismatch in order criteria");
          v0=o->misc4.s; v1=objects[n]->misc4.s; goto compare;
        case OP_MISC4_C:
          if(o->misc4.t || objects[n]->misc4.t) Throw("Type mismatch in order criteria");
          v1=o->misc4.s; v0=objects[n]->misc4.s; goto compare;
        case OP_MISC5:
          if(o->misc5.t || objects[n]->misc5.t) Throw("Type mismatch in order criteria");
          v0=o->misc5.s; v1=objects[n]->misc5.s; goto compare;
        case OP_MISC5_C:
          if(o->misc5.t || objects[n]->misc5.t) Throw("Type mismatch in order criteria");
          v1=o->misc5.s; v0=objects[n]->misc5.s; goto compare;
        case OP_MISC6:
          if(o->misc6.t || objects[n]->misc6.t) Throw("Type mismatch in order criteria");
          v0=o->misc6.s; v1=objects[n]->misc6.s; goto compare;
        case OP_MISC6_C:
          if(o->misc6.t || objects[n]->misc6.t) Throw("Type mismatch in order criteria");
          v1=o->misc6.s; v0=objects[n]->misc6.s; goto compare;
        case OP_MISC7:
          if(o->misc7.t || objects[n]->misc7.t) Throw("Type mismatch in order criteria");
          v0=o->misc7.s; v1=objects[n]->misc7.s; goto compare;
        case OP_MISC7_C:
          if(o->misc7.t || objects[n]->misc7.t) Throw("Type mismatch in order criteria");
          v1=o->misc7.s; v0=objects[n]->misc7.s; goto compare;
        case OP_TEMPERATURE: v0=o->temperature; v1=objects[n]->temperature; goto compare;
        case OP_TEMPERATURE_C: v1=o->temperature; v0=objects[n]->temperature; goto compare;
        case OP_XLOC: v0=o->x; v1=objects[n]->x; goto compare;
        case OP_XLOC_C: v1=o->x; v0=objects[n]->x; goto compare;
        case OP_YLOC: v0=o->y; v1=objects[n]->y; goto compare;
        case OP_YLOC_C: v1=o->y; v0=objects[n]->y; goto compare;
        compare:
          if(v0==v1) {
            p++;
            goto criteria;
          }
          if(v0>v1) goto found;
          break;
        default: fatal("Internal confusion: Invalid order criteria (%d)\n",orders[p]);
      }
    }
    n=objects[n]->next;
  }
  found:
  // Now it has been found; insert this object previous to the found object, removing from its existing slot.
  // (Objects are executed in reverse order, so previous in the linked list means executed next)
  if(firstobj==obj) firstobj=o->next;
  if(lastobj==obj) lastobj=o->prev;
  if(o->prev!=VOIDLINK) objects[o->prev]->next=o->next;
  if(o->next!=VOIDLINK) objects[o->next]->prev=o->prev;
  o->prev=objects[n]->prev;
  o->next=n;
  objects[n]->prev=obj;
  if(o->prev==VOIDLINK) firstobj=obj;
  if(objects[n]->next==VOIDLINK) lastobj=n;
  notfound:
  objects[obj]->oflags|=OF_ORDERED;
}

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;

    while(m!=VOIDLINK) {
      p=objects[m];
      if(p->arrivals&(1<<i)) if(m!=n) send_message(n,m,MSG_CREATED,NVALUE(o->x),NVALUE(o->y),v);
      m=p->up;
    }
  }
  if(o->oflags&OF_DESTROYED) return VOIDLINK;
  if(classes[objects[n]->class]->order) set_order(n);
  m=objects[n]->up;
  if(m!=VOIDLINK) {
    v=send_message(VOIDLINK,n,MSG_SUNK,NVALUE(0),NVALUE(0),v);
    while(m!=VOIDLINK) {
      send_message(n,m,MSG_FLOATED,NVALUE(0),NVALUE(0),v);
      m=objects[m]->up;
    }

  if(generation_number<=TY_MAXTYPE) return "Too many generations of objects";
  if(firstobj==VOIDLINK) return "Game cannot continue with no objects";
  // Finished
  return 0;
}

const char*init_level(void) {
  Uint32 n;
  if(setjmp(my_env)) return my_error;
  clear_inventory();
  if(main_options['t']) {
    printf("[Level %d restarted]\n",level_id);
    if(!traced_obj.t) {
      const char*s;
      optionquery[1]=Q_traceObject;

  changed=0;
  key_ignored=0;
  all_flushed=0;
  lastimage_processing=0;
  vstackptr=0;
  move_number=0;
  current_key=0;
  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);
}

#define OF_MOVED 0x0040
#define OF_DONE 0x0080
#define OF_KEYCLEARED 0x0100
#define OF_DESTROYED 0x0200
#define OF_BIZARRO 0x0400
#define OF_MOVED2 0x0800
#define OF_MOVING 0x1000
#define OF_ORDERED 0x2000

typedef struct {
  const char*name;
  const char*edithelp; // not present if CF_GROUP
  const char*gamehelp; // not present if CF_GROUP
  Uint16*codes;
  Uint16*messages; // use 0xFFFF if no such message block