Please refer to #20867 and #20870 for a easier view of the changes. Those two PRs show all meaningful changes (hopefully) and doesn't show the files changed with just 3 lines changed.
This PR does three things:
It makes all children of /obj/ use the same damage system.
Previously to make your new machine/structure be destroyable you needed to give it a var/health, and its own version of many damage related proc such as bullet_act(), take_damage(), attacked_by(), attack_animal(), attack_hulk(), ex_act(), etc... But now, all /obj/ use the same version of those procs at the /obj/ level in code/game/obj_defense.dm. All these obj share the same necessary vars: obj_integrity (health), max_integrity, integrity_failure (optional, below that health level failure happens), and the armor list var which was previously only for items, as well as the resistance_flags bitfield. When you want your new object to be destroyable, you only have to give it a value for those vars and maybe override one proc if you want a special behavior but that's it. This reorganization removes a lot of copypasta (most bullet_act() version for each obj were nearly identical). Two new elements are added to the armor list var: fire and acid armor values.
How much damage an obj take depends on the armor value for each damage category. But some objects are INDESTRUCTIBLE and simply never take any damage no matter the type.
The armor categories are:
-melee(punches, item attacks, xeno/animal/hulk attacks, blob attacks, thrown weapons)
-bullet
-laser
-energy (used by projectiles like ionrifle, taser, and also by EMPs)
-bio (unused for this, only here because clothes use them when worn)
-rad (same)
-bomb (self-explanatory)
-fire (for fire damage, not for heat damage though)
-acid
For machines and structures, when their health reaches zero the object is not just deleted but gets somewhat forcedeconstructed (the proc used is shared with the actual deconstruction system) which can drops things. To not frustrates players most of these objects drop most of the elements necessary to rebuild them (think window dropping shards). Machines drop a machine frame and all components for example (but the frame can then be itself smashed to pieces).
For clothes, when they are damaged, they get a "damaged" overlay, which can also be seen when worn, similar to the "bloody" overlay.
It refactors acid. See #20537.
Some objects are ACID_PROOF and take no damage from acid, while others take varying amounts
of damage depending on their acid armor value. Some objects are even UNACIDABLE, no acid effect can even land on them. Acid on objects can be washed off using water.
It changes some aspect of damage from fires.
All /obj/ can now take fire damage and be flammable, instead of just items. And instead of having just FLAMMABLE objs that become ON_FIRE as soon as some fire touch them (paper), we now have objects that are non flammable but do take damage from fire and become ashes if their health reaches zero (only for items). The damage taken varies depending on the obj's fire armor value and total health. There's also still obj and items that are FIRE_PROOF (although some might still be melted by lava if they're not LAVA_PROOF).
When a mob is on fire, its clothes now take fire damage and can turn to ashes. Similarly, when a mob takes melee damages, its clothes gets damaged a bit and can turn to shreds. You can repair clothes with cloth that is produceable by botany's biogenerator.
It also does many minor things:
Clicking a structure/machine with an item on help intent never results in an attack (so you don't destroy a structure while trying to figure out which tool to use).
I moved a lot of objects away from /obj/effect, it should only be used for visual effects, decals and stuff, not for things you can hit and destroy.
I tweaked a bit how clothes shredding from bombs work.
I made a machine or structure un/anchorable with the wrench, I don't remember which object...
Since I changed the meaning of the FIRE_PROOF bitflag to actually mean fire immune, I'm buffing the slime extract that you apply on items to make them fire proof. well now they're really 100% fire proof!
animals with environment_smash = 1 no longer one-hit destroy tables and stuff, we give them a decent obj_damage value so they can destroy most obj relatively fast depending on the animal.
Probably a million things I forgot.
If you want to know how the damage system works all you need is the three obj vars "obj_integrity", "max_integrity", "integrity_failure", as well as the armor list var and the resistance_flags bitfield, and read the file obj_defense.dm
This just adds some vars that the refactor will use. Putting this in a separate PR prevent the damage refactor PR from becoming too big (number of files changed) and hard to read and review.
Introduces the resistance_flags bitflag that replaces unacidable and burn_state.
Moves the armor var from item to /obj level and gives specific armor values to many objects, the armor list also gets two new armor types: fire and acid, which will be used in the refactor. the new fire and acid armor values are given to plenty of items.
Adds a large ash and large molten item decal (for future use)
simplifies decal/cleanable/replace_decal() code a bit.
Changes construction() proc to on_construction() for consistency, same for deconstruction().
Made a deconstruct() proc for machinery and computer (also for future use).
🆑 Joan
rscadd: Once the blob alert message is sent in the blob game mode, all mobs get to see how many tiles the blob has until it wins, via the Status tab.
rscdel: Removed/merged a bunch of blob chems, you probably don't care about the specifics.
tweak: The remaining blob chems should, overall, be more powerful.
tweak: Shield blobs soak brute damage less well.
tweak: Flashbangs do higher damage to blobs up close, but their damage falls off faster.
experiment: Shield blobs now cost 15 resources to make instead of 10. Node blobs now cost 50 resources to make instead of 60.
experiment: Expanding/attacking now costs 4 resources instead of 5, and blobs can now ATTACK DIAGONALLY. Diagonal attacks are weaker than normal attacks, especially against cyborgs(which may be entirely immune, depending), and they remain unable to expand diagonally.
rscadd: Shield blobs no longer block atmos while under half health. Shield blobs are still immune to fire, even if they can't block atmos.
tweak: Blobs should block explosions less well.
rscadd: Blob cores and nodes are no longer immune to fire and no longer block atmos.
rscadd: Blobs can only auto-expand one tile at a time per expanding thing, and should be easier to beat back in general.
tweak: Blobbernauts now attack faster.
tweak: Blob Overminds attack mobs slower but can attack non-mobs much faster.
rscadd: Blob Overminds start with some amount of resources; in the gamemode, it's 80 divided by the number of overminds, in the event, it's 20 plus the number of active players, and otherwise, it's 60.
bugfix: You can no longer move blob cores into space, onto the mining shuttle, white ship, gulag shuttle, or solars.
bugfix: Blob rounds might be less laggy, if they were laggy?
tweak: Blobs don't heal as fast, excluding the core.
experiment: Blobs are marginally less destructive to their environment.
/🆑
Objective:
maybe possibly make blob something you can fight instead of wishing the blob didn't exist?
but also make the blob lethal enough that it can still deal with the crew if it knows what it's doing(and still lose if the crew is good instead of snowballing forever)
Blood drips icons are now in blood.dmi instead of drip.dmi (which only had the 5 drip sprites).
Moved projectiles, guns, casings and ammo boxes to be in the right files. Please don't put your gun with its projectile, ammo casing and ammo box all the same file.
I split growing.dmi into 5 smaller files so we don't get close to the 512 icon limit again. Each seed has a var to indicate which icon file to use when planted.
Fixes code for heavy pulse laser projectile to be less awful.
obj/effect/effect is now renamed obj/effect/particle_effect for better usability.
datum/effect/system and /datum/effect/effect/system are now both /datum/effect_system.
Fixes a bug where wall mounted igniters (and other spark producing objects) didn't produce sparks sometimes.
Moved explosion_particles.dm into the effect_system folder, because it has effect_systems code.
-Fixes a few structures/machines taking non brute/burn damage from attack_animal
-Adjusts girders to be a little less resistant to explosions
-Span classes all the swarmer messages, bumps their health up to 40
-Adds ability for swarmers to dismantle machines and disable cameras. Some are obviously protected.
