This was done to ensure it can be properly overridden in scripts without causing problems when called during engine shutdown for the type and symbol objects the VM needs to work and to have the scripted version always run first.
Since the scripted OnDestroy method never calls the native version - the native one is run after the scripted one - this can be simply skipped over during shutdown.
It can actually happen that the thinker chain gets broken if an actor being iterated happens to destroy the immediately following actor in the chain as well. In that case both actors lose their chain links and the iterator cannot advance any further, the only solution to avoid a crash is to terminate the iteration of the current list.
It is utterly pointless to require every function that wants to make a VM call to allocate a new stack first. The allocation overhead doubles the time to set up the call.
With one stack, previously allocated memory can be reused. The only important thing is, if this ever gets used in a multithreaded environment to have the stack being declared as thread_local, although for ZDoom this is of no consequence.
- eliminated all cases where native code was calling other native code through the VM interface. After scriptifying the game code, only 5 places were left which were quickly eliminated. This was mostly to ensure that the native VM function parameters do not need to be propagated further than absolutely necessary.
Needless to say, this is simply too volatile and would require constant active maintenance, not to mention a huge amount of work up front to get going.
It also hid a nasty problem with the Destroy method. Due to the way the garbage collector works, Destroy cannot be exposed to scripts as-is. It may be called from scripts but it may not be overridden from scripts because the garbage collector can call this function after all data needed for calling a scripted override has already been destroyed because if that data is also being collected there is no guarantee that proper order of destruction is observed. So for now Destroy is just a normal native method to scripted classes
- added an 'exact' parameter to FThinkerIterator's Next function. This is mainly for scripting which allows to do a lot more checks natively when running the iterator while looking for one specific class.
- exported thinker iterator and drop item chain to scripting. Unlike its native counterpart the script-side iterator is wrapped into a DObject to allow proper handling for memory management.
- fixed: The VMFunctionBuilder only distinguished between member and action functions but failed on static ones.
- fixed: FxAssign did not add all needed type casts. Except for purely numeric types it will now wrap the expression in an FxTypeCast. Numeric handling remains unchanged for both performance reasons and not altering semantics for DECORATE.
- exported all internal flags as variables to scripting. They still cannot be used in an actor definition.
- make ATAG_STATE the same as ATAG_GENERIC. Since state pointers exist as actual variables they can take both values which on occasion can trigger some asserts.
- gave PClass a bExported flag, so that scripts cannot see purely internal classes. Especially the types like PInt can cause problems.
Todo: we need readonly references to safely expose the actor defaults. Right now some badly behaving code could overwrite them.
I wish I had realized this the last time it came up - it would have saved me a lot of trouble.
But as it turns out, the more recent travelling code makes all of this completely unnecessary, working perfectly fine with deleting the player pawns along with the rest of the thinkers before loading the stored ones from the savegame (and getting rid of those in G_FinishTravel.)
And with a sane savegame format that does not depend on side effects from how the thinker serializing handled linking into the lists the old code was even harmful, leaving voodoo dolls behind.
I had the exact same effect when I tried to reshuffle some things for reliably restoring portals, but did not make the connection to interference between two mutually incompatible player travelling mechanisms that just worked by sheer happenstance with the original order of things.
After testing with a savegame on ZDCMP2 which is probably the largest map in existence, timing both methods resulted in a speed difference of less than 40 ms (70 vs 110 ms for reading all sectory, linedefs, sidedefs and objects).
This compares to an overall restoration time, including reloading the level, precaching all textures and setting everything up, of approx. 1.2 s, meaning an increase of 3% of the entire reloading time.
That's simply not worth all the negative side effects that may happen with a method that highly depends on proper code construction.
On the other hand, using random access means that a savegame version change is only needed now when the semantics of a field change, but not if some get added or deleted.
- do not I_Error out in the serializer unless caused by a programming error.
It is better to let the serializer finish, collect all the errors and I_Error out when the game is known to be in a stable enough state to allow unwinding.
Note that even with this change it is still not possible to unarchive any thinker pointers before the thinker list has been loaded as it would create broken lists.
This was to resolve some circular dependencies with the portal code.
The most notable changees:
* FTextureID was moved from textures.h to doomtype.h because it is frequently needed in files that don't want to do anything with actual textures.
* split off the parts from p_maputl into a separate header.
* consolidated all blockmap related data into p_blockmap.h
* split off the polyobject parts into po_man.h
- Fixed: DThinker::Destroy(Most)ThinkersInList() were unreliable when
destroyed thinkers destroyed more thinkers in the same list.
Specifically, if the thinker it destroyed caused the very next thinker
in the list to also be destroyed, it would get lost in the thinker list
and end up with a NULL node. So just keep iterating through the first
thinker in the list until there are none left. Since destroying a
thinker causes it to remove itself from its list, the first thinker will
always be changing as long as there's something to destroy.
- Instead of tying NoDelay behavior to OF_JustSpawned, use a new actor
flag, MF7_HANDLENODELAY. This only gets cleared once it has actually
been checked by Tick(). This is necessary because freeze mode delays the
initial run of Tick() past the initial spawn, so OF_JustSpawned will no
longer be set when it does the initial tick.
- Delay NoDelay processing if an actor is spawned dormant. Actors spawned
dormant have Deactivate() called before they tick, so MF7_HANDLENODELAY
will remain set as long as an actor is dormant. This allows the NoDelay
handling to occur as expected once it is activated.
When set, the actor will run this state during its first tick. This means Spawn
states may now run an action function if you set this flag. Note that this action function
is executed during the actor's first tick, which is not the same as when it is spawned.
SVN r4240 (trunk)
about this now. I spent three days trying to figure out why the VC++ debug version was so slow.
It turns out I had a conditional breakpoint set in a high-traffic area. D'oh!
The rest of this stuff should get merged into trunk:
- Fixed: Writing to debugfile uses the standard fprintf, which does not understand %td on VC++.
- Fixed: Instead of crashing when a sprite has been scaled to 0, just don't draw it.
SVN r3896 (scripting)
- fixed: D_ErrorCleanup must clear 'savegamerestore'.
- fixed: Cleaning up when loading a savegame failed while restoring the thinker list did not work. There were two issues:
* removed the asserts in GC::SweepList because they get triggered by thinkers that were not fully initialized during loading.
* AActor::UnlinkFromWorld may not assume that the sector list has been initialized when this function is called.
SVN r3274 (trunk)
- fixed: The BossCube could be blocked by floors and ceiling resulting
in incorrect movement. I changed it so that A_BrainSpit now sets the
MF5_NOINTERACTION flag for anything it spawns that has the MF_NOCLIP
flag. For travelling cubes active collision detection makes no sense
and only causes problems. This should also make the boss brain
work in the other games which previously were excluded by a game mode
check in the movement code.
- fixed: ACS's GetUserVariable did not work for the script activator.
- fixed: Moving floors could be blocked by 2 actors without MF2_PASSMOBJ
overlapping each other (common mapping bug, check Herian 2 MAP30.)
SVN r1891 (trunk)
that were changed some time ago.
- fixed: The damage inflictor for a rail attack was the shooter, not the puff.
- Fixed: Floor and ceiling huggers may not change their z-velocity when seeking.
- Fixed: UDMF set the secret sector flag before parsing the sector's properties,
resulting in it always being false.
- Renamed sector's oldspecial variable to secretsector to better reflect its
only use.
- Fixed: A_BrainSpit stored as the SpawnShot's target the intended BossTarget,
not itself contrarily to other projectile spawning functions.
A_SpawnFly then used the target for CopyFriendliness, thinking it'll be the
BossEye when in fact it wasn't.
- Added Gez's submission for a DEHACKED hack introduced by Boom.
(using code pointers of the form 'Pointer 0 (x statenumber)'.
- fixed: Attaching 3DMidtex lines by sector tag did not work because lines
were marked by index in the sector's line list but needed to be marked by
line index in the global array.
- fixed: On Linux ZDoom was creating a directory called "~.zdoom" for
save files because of a missing slash.
- fixed: UDMF was unable to read floating point values in exponential format
because the C Mode scanner was missing a definition for them.
- fixed: The recent changes for removing pointer aliasing got the end sequence
info from an incorrect variable. To make this more robust the sequence index
is now stored as a hexadecimal string to avoid storing binary data in a string.
Also moved end sequence lookup from f_finale.cpp to the calling code so that
the proper end sequences can be retrieved for secret exits, too.
SVN r1777 (trunk)
thinkers tick, not just once every game tick. This more closely follows
the original Lua behavior. This change was made because, in cases of
extremely large and frequent memory allocations, the collector may not run
fast enough if it only has a chance to execute once per tick.
SVN r1197 (trunk)
list, it should just be ignored during the propagation stage.
- After sleeping on it and realizing what was really going in, I generalized
the inventory fix from the 13th: The actor is flagged by Destroy(), then it
is later inserted into the thinker list by DThinker::SerializeAll(). So
rather than unlinking the skipped player from their inventory, just make
sure any flagged thinkers aren't inserted into a list.
- Fixed: FCanvasTextureInfo::Viewpoint needed a read barrier, and the whole
list should serve as a root.
- Reimplemented SPC playback as a custom codec for FMOD.
- Removed spc_frequency, because snes_spc only supports the SPC's native
frequency of 32000 Hz.
SVN r806 (trunk)
copies of the players stored in the archive would be destroyed and break
apart the STAT_INVENTORY thinker list. Now they aren't destroyed while
loading the archive but are unlinked from the inventory list instead, so
the garbage collector will get them later.
- Changed pointer substitution to return the number of pointers changed.
SVN r803 (trunk)
way wasn't playing well with the write barriers.
- Fixed: DFrameBuffer::WriteSavePic needs to fix the canvas in place while
using it.
- Fixed: The sound system was updated every frame, which is a complete waste
of time. Doing it only once each tic is quite sufficient, since nothing
really moves between tics, even if the display makes it look otherwise.
SVN r799 (trunk)
FreshThinkers lists. These thinkers would still be saved in the savegame if
there were other references to them, but they would not go in any thinker
lists when loading the savegame. An easy way to exercise this bug is to
give yourself something new with the console and then save the game right
away without closing the console by using the "save" command. The item
would be stored in the savegame thanks to its presence in the Inventory
list, but it wouldn't be in a thinker list when the game was reloaded
because it was still in the FreshThinkers list when the game was saved.
SVN r763 (trunk)
- Added DECORATE support for setting an actor's args. If this is done
it will also disable the actor's special that can be set in a map. This
is for actors that want to use A_CountdownArg or similar functions
that use the args for something different than the special's parameters.
- Converted a_sharedmisc.cpp to DECORATE.
- Added a new NActorIterator that can search for classes specified by name.
- Added a new constructor to TThinkerIterator that can search
for DECORATE defined subclasses that are not represented by a real C++ class.
- Fixed: BuildInfoDefaults must set the parent symbol table so that
all actors can get to the global symbols stored in AActor.
- Fixed some minor inconsistencies in the Arch-Vile's DECORATE definition.
- Fixed: A_VileAttack moved the flame without relinking it into the sector
lists. It also forgot to set the z-position correctly. (original Doom bug.)
- Fixed: The Doom 2 cast finale didn't work with the dynamic state name handling.
SVN r401 (trunk)
- The stat meters now return an FString instead of sprintfing into a fixed
output buffer.
- NOASM is now automatically defined when compiling for a non-x86 target.
- Some changes have been made to the integral types in doomtype.h:
- For consistancy with the other integral types, byte is no longer a
synonym for BYTE.
- Most uses of BOOL have been change to the standard C++ bool type. Those
that weren't were changed to INTBOOL to indicate they may contain values
other than 0 or 1 but are still used as a boolean.
- Compiler-provided types with explicit bit sizes are now used. In
particular, DWORD is no longer a long so it will work with both 64-bit
Windows and Linux.
- Since some files need to include Windows headers, uint32 is a synonym
for the non-Windows version of DWORD.
- Removed d_textur.h. The pic_t struct it defined was used nowhere, and that
was all it contained.
SVN r326 (trunk)
