Buildcraft Is a Compiler Problem
mitander.xyz
mitander.xyz
if skill == cleave and support == focused_edge: make cleave smaller but stronger
if skill == cleave and support == twin_cleave and rule == guarded_arc: quietly move to the woods
>That can work for a demo. It gets rough once the game has lots of skills, supports, items, statuses, and encounter rules.
Laughs in path of building : https://github.com/PathOfBuildingCommunity/PathOfBuilding-Po...
Path of Exile has deeper mechanics than pretty much every other ARPGs out there, PoB covers the vast majority of them, in a beautiful mess of about 20k lines of calculations in various files.
Making it a "Compiler problem" makes it an unsolvable one in acceptable time.
Fun fact: it directly parses mods from their ingame description into a mod database that is basically a stringly typed list of whatever increases also. : https://github.com/PathOfBuildingCommunity/PathOfBuilding-Po...
Second fun fact: that's the one for Path of Exile 2, that has different mechanics. The PoE1 version is the same thing, except even larger.
So yeah, don't bother about making a compiler. Your compiler will figure out micro upgrades and die in three months when the game adds incompatible mechanics. Stay agile and on your feet.
If I understand correctly, "compilation" is needed only on equipment change. I remember some FPS drop in PoE when changing the gear too.
>in a beautiful mess of about 20k lines of calculations in various files.
And is it actually suitable for realtime? PoB is not a realtime application.
FPS drops in PoE would not be caused by damage recalc: this is done entirely server side and on application of the damage/dot tick. That drop you're seeing is just loading the assets and recompiling some shaders, if anything.
But also: it doesn't need to be realtime. Your damage is a simple math formula, applied against another for enemy defense, for each hit instance. There are definitely some builds that stress servers due to the sheer amount of hits/tick, but that's a matter of optimisation. PoE lowers server ticks when it can't follow.
The post is talking about optimizing for build damage/resistance/etc, crafting a build. Which probably doesn't even take into account conversion shenanigans, over time things like wardloop that requires setup, cwdt and a load of other things. This is not an optimizable thing in any reasonable time, and human application of logic is pretty much faster.
I also think something similar could be implemented for an in-game rig of animated characters. In order to cut off the computation of animations that don't affect the result in any way at an earlier stage — for example, when the character switches weapons. This could make animation code more CPU cache friendly as many conditions could be optimized out.
You start with facts, which are composed by rules. The current state at any given instant is the fixed point of the derived facts. Provenance is the path through the derivation graph. The whole thing is relational algebra, like SQL or datalog.
A helpful side effect of this perspective is that it can adjust our performance expectations. For example, You can do an in-memory, in-process relational query in microseconds for thousands or millions of rows, way more than any realistic game scene. Incremental updates, etc are nice optimizations, but just let'er rip first and see how fast it goes.
You can even do these kinds of queries fast enough to end up memory bottlenecked if you restrict yourself to queries with fixed graph degree, which is admittedly a mouthful to say (and understand).