Free Hero Mesh

19=Departures, 32=Busy, 33=Invisible, 34=UserSignal, 35=UserState,
36=KeyCleared, 37=IsPlayer, 38=Destroyed, 39=Stealthy, 40=VisualOnly,
48=Msg, 49=MsgFrom, 50=MsgArg1, 51=MsgArg2, 64=Density, 65=Volume,
66=Strength, 67=Weight, 68=Distance, 69=Height, 70=Climb, 72=HardE,
73=HardN, 74=HardW, 75=HardS, 76=SharpE, 77=SharpN, 78=SharpW, 79=SharpS,
80=ShapeE, 81=ShapeN, 82=ShapeW, 83=ShapeS, 84=Shovable

[2/1*] Retrieve local variable from other object. Local variable numbers
are the same as opcode 1.

[3/1] Assignment to standard local variables of current object.

[4/2] Assignment to standard local variable of other object (the first
(top) value taken from the stack is the value, and second is the object).

[5*] User-defined local variable; the second byte is zero-based local
variable number.

[6/1] Assignment to user-defined variable; the second byte is the
zero-based local variable number to write to.

[7*] Short decimal constant; the second byte is the 8-bit value.

[8*] Long decimal constant. The next two words are the small-endian 32-bit
number that it represents.

[9*] Short class constant; the second byte is a zero-based class number
(the class number is one-based at runtime).

[11*] Message constant; the second byte is the message number.

[13*] String literal. Follow by one WORD giving number of bytes of string
(including null terminator, always even), and then null-terminated special
text. There may be two null terminators if needed to make it even.

[14*] Direction constant (0-7 for absolute, 8-15 for relative)

[16/1*] Unary operator: 0=negative, 1=bitwise NOT, 2=logical NOT

[17/2*] Binary operator: 0=multiply, 1=divide, 2=modulo

[18/2*] Binary operator: 0=add, 1=subtract, 2=AND, 3=OR, 4=XOR

[32] ObjDir

[34] ObjAbove

[36] ObjBelow

[38/2*] 0=ObjTopAt, 1=ObjBottomAt, 2=VolumeAt, 3=HeightAt, 4=Delta

[39*] Self

[40/3*] ObjClassAt

[48*] Key

[49*] Animation constant: 0=STOP, 1=ONCE, 2=LOOP, 8=OSC

[50*] Keyboard constant: See section about key codes.

[59*] Bit constant 0-31; the second byte is the number 0-31, and at
runtime it is replaced by the relevant 32-bit number.

[60*] Sound constant (see section about user sounds)

[61] 0=ClassCount/1* (I don't know what this does), 1=GetArray

[64/3*] SendMessage (to Self)

[65/4*] SendMessage

[66/3*] Broadcast; second byte is zero-based class number

[67/4*] Broadcast

[68/1*] Move(Self, ...); minor code is 255 to take the value from the
stack, or is another number for a direction constant (in this latter case
the same bug occurs as with opcode 84).

[69/2*] Move; minor code is same as opcode 68, but the bug with opcode 84
does not occur, regardless of the minor code.

[70/2*] JumpTo(Self, ...)

[71/3*] JumpTo

[72/5*] Create

[74*] Destroy(Self)

[75/1*] Destroy

[80/3] SendMessage(Self, ...)

[81/4] SendMessage

[82/3] Broadcast; second byte is zero-based class number

[83/4] Broadcast

[84] Move(Self, dir). The second byte is the direction to move. Unlike
the normal Move() function, this one adds Strength to Inertia instead of
setting Inertia equal to Strength (this seems to be a bug). If the minor
code is 255 then takes direction from stack and does not have this bug.

[85] Move. The second byte is the same as for opcode 84; if 255 then it
takes from the stack (before taking the object to move). In this case the
bug mentioned above does not occur regardless of what the minor code is.

[88/5] Create

[96] Comment. Has one WORD giving length of the comment text (including
the null terminator), and then the plain text of the comment (with CRLF
line endings), null terminated.

[97] Popup setting. Second byte is 0 for PopupColor or 1 for PopupLoc.

[98] Destroy(Self)

[99/1] Destroy

[100] CallSub

[101-] Goto; next WORD is address to branch to unconditionally

[102] Return. Second byte is 0 for implicit end of SUBS block, 1 for
return from a subroutine, 2 for the end of a message block.

[103-] Return short constant. Second byte is return value.

[104/1] Return

[105/1] If. Second byte is zero for block-if or one for inline-if. The
next word is the number of words to skip (including the count itself) if
the condition is false.

[106] Else

[107/3] ImageSeq (seems to do nothing?)

[108/3] ImageLoop (seems to do nothing?)

[109] PopUp. Values taken from the stack is one plus the minor code.

[110/2] JumpTo(Self, ...)

[111/3] JumpTo

[112] Sound

[114] Array operations. Second byte: 0 = definition of an array, 1 =
SetArray, 2 = InitArray.

[126] Animate

[134] ForEachObjAt

[240] Trace


=== Levels ===

After all classes are the levels. Before the levels comes a header of four
bytes that consists of:

* Number of levels (WORD)

* Two null bytes with unknown meaning

Each level consists of:

* Zero-based level number (WORD)

* Level description length, including the null terminator (WORD)