IRC log for #minetest, 2025-01-25

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01:33	Blockhead256	someone needs to put out (or point out, if it already exists) a good tutorial on rollback. I've poked a lot of Luanti's corners, but not that one
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02:07	MTDiscord	<wsor4035> 1, run the command 2. be prepared for it to lock up the server 3. restart server 4. when rollback file is massive, delete it
02:07	MTDiscord	<wsor4035> you are now a rollback expert
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02:28	cheapie	wsor4035: VE-C even has a script for cleaning up the rollback DB (in a smarter way than that) but at some point the backup script was made to not run it any more :/
02:29	cheapie	It's in scripts/cleanup-rollback.sh if you want it, it removes all entries older than 30 days as well as all entries (any time) from players with the "daily_rollback_cleanup" priv.
02:30	cheapie	There's also a cleanup-auth.sh, that one deletes all players (from both the auth and players DBs) that haven't logged in for over a year, or 7 days if they don't have interact, or never if they have spill, mesemaker, areas_high_limit, ui_full, or basic_privs.
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06:09	repetitivestrain	forgive me if I am mistaken but isn't get_biome_data very inefficient in that it redundantly computes biome heat and humidity, which is already computed by calcBiomeAtPoint
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09:22	sfan5	"very inefficient" is overstated but yes it does calculate that twice
09:33	repetitivestrain	sfan5: it becomes noticeable when the function is being called >4000 times per globalstep
09:35	sfan5	did you check how much time is spent in the api function?
09:42	repetitivestrain	yeah, somewhere on the order of 3500 us per globalstep
09:44	sfan5	that might or might not be okay depending on long the rest of your globalstep is
09:44	sfan5	what I'm saying is "even if it were half of that, would it fix the problem you have?"
09:49	MinetestBot	[git] sfan5 -> luanti-org/luanti: Fix shadow flicker on camera offset update (#15709) b861f0c https://github.com/luanti-org/luanti/commit/b861f0c5c59546b64e937fdf384634175df4a372 (2025-01-25T09:47:52Z)
09:49	MinetestBot	[git] stefanbeller -> luanti-org/luanti: filesys: replace goto by #else to avoid compiler warning 282c81f https://github.com/luanti-org/luanti/commit/282c81fe3a2533659c48275a260b5e393011da2b (2025-01-25T09:48:15Z)
09:49	repetitivestrain	sfan5: it would greatly improve matters, yes
09:50	repetitivestrain	Mineclonia has a globalstep budget of 0.05s per step, with 0.035 devoted to pathfinding, leaving 15 ms for other tasks
09:51	sfan5	I see
09:56	sfan5	have you considered if caching could help?
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13:10	SwissalpS	81
13:10	SwissalpS	oops
13:11	repetitivestrain	sfan5: i'm not certain how we would cache the results of get_biome_data, as it's called with randomly generated positions
13:13	MTDiscord	<rollerozxa> SwissalpS: last two digits of your debit card? 😄
13:13	SwissalpS	you wish ROllerozxa :D
13:15	* SwissalpS	was typing "/4" but his hand didn't move up far enough
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14:40	sfan5	repetitivestrain: entirely random? or random loaded blocks? how much precision do you need? is what comes to mind
14:40	repetitivestrain	they're random positions selected from amongst currently loaded mapblocks and they should be precise to the block
14:41	repetitivestrain	but minor deviations would not be unacceptable
14:43	sfan5	block or node?
14:43	sfan5	(accurate to)
14:47	sfan5	asking because if it needs to be accurate to the block you could reasonably keep a biome cache for all active blocks
14:47	sfan5	s/active/loaded/
14:48	repetitivestrain	Node, sorry
14:49	repetitivestrain	i was thinking in minecraft terms
14:57	sfan5	ah, unfortunate then
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20:31	shaft	I tried to read out damage from on_punch but it's always fucking 0. Instead the damage is only in tool_capabilities. Does any game use this or why is this part of the api if it's always 0?
20:32	shaft	If nothing uses it, it should be removed. Confusing last argument that does nothing for no reason.
20:32	shaft	on_punch(self, puncher, time_from_last_punch, tool_capabilities, dir, damage)
20:35	ireallyhateirc	could be just a bug
20:36	shaft	Mineclonia, MTG and Repixture all report 0
20:37	shaft	Yes, it could be a bug
20:37	shaft	Enginedevs explain this
20:38	ireallyhateirc	I checked and the bug doesn't have an issue on github so you may want to report it too
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20:39	shaft	But is it a bug or intended? Could be an abandoned argument?
20:39	ireallyhateirc	returning always 0 is dumb and I see no reason why it'd behave that way
20:40	ireallyhateirc	and it appears that it's not documented in any way either
20:40	ireallyhateirc	could be just bitrot from old times or something like that
20:50	shaft	Hmm. Trying to make a minimal reproducable example, it seems that it's only 0 in my hijack function
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20:54	shaft	Is it because they are animals?
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21:29	shaft	I DONT UNDERSTAND IT
21:29	shaft	cry
21:30	shaft	core.register_entity("entity_test:a", {
21:30	shaft	initial_properties = {
21:30	shaft	visual = "cube",
21:30	shaft	visual_size = {x=1, y=1, z=1},
21:30	shaft	textures = {"default_wood.png", "default_wood.png", "default_wood.png",
21:30	shaft	"default_wood.png", "default_wood.png", "default_wood.png"},
21:30		shaft was kicked by ShadowBot: Message flood detected. Use a pastebin like pastebin.mozilla.org.
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21:34	shaft	https://gitgud.io/-/snippets/2475
21:34	shaft	Can someone help me?
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21:36	MinetestBot	jemius: Jan-21 01:47 UTC <Blockhead256> If you want to add to recent Minecraft then the Minecraft-clone games are the target; however if you think those games are cluttered, MTG is more minimal
21:37	jemius	Does the minetest engine use Vulkan for graphics?
21:37	ireallyhateirc	OpenGL apparently
21:38	shaft	OpenGL and OpenGL ES on mobile
21:38	rubenwardy	shaft: you don't need a table for hijacked_functions, you can have a local in the if statement. Local scope is per execution
21:38	rubenwardy	not sure what the specific issue is though, maybe the punch/armor groups don't match up?
21:40	shaft	I tried hijacking my entity_test:a and that worked but creatures still have 0 damage
21:40	shaft	entity_test:a returned 10 damage because I hit it in creative and it had 10 hp and died instantly
21:40	shaft	How do I avoid the function table?
21:42	shaft	I mean adding a variable to the entity definition is not any better than another table.
21:42	rubenwardy	https://gist.github.com/rubenwardy/6a001ae6cb05fece8b6b58fb55581faa
21:42	shaft	It's both one table access
21:43	shaft	Oh does that work? How is that language feature called again?
21:43	rubenwardy	it's scopes
21:43	rubenwardy	variable scope is per invocation
21:44	rubenwardy	so each time that if statement body runs, a new local is made
21:46	shaft	It's called "closures". I didn't know Lua had it.
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21:48	shaft	Lua can't easily "generate code". A closere is if a function is bound to a variable together with variables it will use in its body when run.
21:50	shaft	Look, I can explain it even though I'm too dumb to use them when sensible.
21:52	MTDiscord	<luatic> A closure is a function with upvalues
21:53	MTDiscord	<luatic> There are some nuances here that you do not want to miss however
21:54	shaft	Such as?
21:57	shaft	It's good that I'm using the fancy closures now but I still don't understand why damage is 0 for mobs but not my self made entity even though both do take damage and die
21:57	MTDiscord	<luatic> They are mutable and, in a sense, shared
21:59	MTDiscord	<luatic> or more specifically can be shared
21:59	shaft	In Lua everything is mutable and can be shared, right?
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22:09	MTDiscord	<luatic> wouldn't really say it like that. strings and numbers are immutable values, userdata can decide whether it lets you mutate it.
22:11	shaft	Of course, primitives aren't but are in some other languages like Ruby. I said it wrong.
22:12	shaft	But being able to mutate not just a variable that holds a number but the number itself is really rare.
22:13	MTDiscord	<luatic> tbh with boxed bignums it can happen but yeah
22:13	shaft	Not a primitive in the core of most languages.
22:14	shaft	Anyway. How do I find out the real damage or why my damage field is 0?
22:14	MTDiscord	<luatic> do some debugging, see where the data flows, trace it back, print until you find out where it first is 0
22:15	MTDiscord	<luatic> that'll be fifty bucks
22:16	shaft	Is it an enginebug? Having hijacked the function, I should be the first one who receives it after all.
22:18	MTDiscord	<luatic> it is an engine bug once you have debugged it to be one. and no that logic doesn't check out, especially not in a modded game.
22:18	MTDiscord	<luatic> one obvious reason why is that you can't guarantee that you're the only hijacker.
22:20	SwissalpS	especially not that yours is the first called one.
22:23	shaft	I ran this in multiple games with this being the only third party mod.
22:25	SwissalpS	the games can hijack too, or their mods
22:26	shaft	And what retarded hijack would mobs api, repixture, mcl_mobs all have in common that sets damage to 0 before passing it to me
22:26	shaft	?
22:26	shaft	0, not nil or any other value
22:26	SwissalpS	no need for insults
22:27	shaft	I haven't insulted anyone. I doubt there is such a hijack
22:28	SwissalpS	so with "retarded hijack" you meant to say "delayed hijack"?
22:30	shaft	I mean a hijack that doesn't fucks with the values for no reason. Like if someone explicitely writes out the arguments instead of ... or doesn't return the arguments or doesn't pass the arguments on
22:30	shaft	But here it's 0
22:31	* SwissalpS	is no longer interested in this conversation
22:31	shaft	Is damage in on_punch the final damage value the entity takes to it's hp?
22:32	shaft	Or do I misunderstand it.
22:34	shaft	I've used core.after(2 now. I AM THE ONLY HIJACKER AND I GET 0 AS DAMAGE FIELD FROM on_punch but only for mobs. For my self made entity, i get the real value
22:34	shaft	Is it engine or not?
22:35	shaft	Is it a bug or is 0 damage and entity dying mutually exclusive
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22:48	shaft	Since you're going silent on me I filed a bug report: https://github.com/luanti-org/luanti/issues/15717
22:48	shaft	What else can I do?
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22:49	shaft	Clearly the engine is giving me 0.
22:54	shaft	Sorry for being rude. It's just frustrating. I'll do something else now.
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