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Improve documentation of nearest_po2() #72091

Merged
merged 1 commit into from Aug 7, 2023
Merged

Improve documentation of nearest_po2() #72091

merged 1 commit into from Aug 7, 2023

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MewPurPur
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@MewPurPur MewPurPur commented Jan 26, 2023 •
edited

Note: This PR used to change behavior too, but now it's just a performance PR

Note: This PR is now just a documentation tweak.

Addresses an extra corner case for the method and words the method description a little clearer.

@MewPurPur MewPurPur requested review from a team as code owners January 26, 2023 01:05
@Calinou Calinou added this to the 4.0 milestone Jan 26, 2023
@raulsntos
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It'd be great if you could also update the Mathf.NearestPo2 method in C# 🙏. Keep in mind we use 32-bit int in C# and I don't think we want to change that to 64-bit.

Also, we should add some unit tests for this method.

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MewPurPur commented Jan 26, 2023 •
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@raulsntos C# already uses this PR's optimization, but keeps the edge cases. I could add if (value <= 1) { return 1; } at the beginning though, perhaps at a slight performance cost but not too relevant. Should I though? If we're fine with those edge cases, I can only keep this GDScript optimization and otherwise keep the function's return values as they are.

I would like some sort of consensus on this before proceeding with adding test cases.

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I could add if (value <= 1) { return 1; } at the beginning

Yeah, that's what I meant, if we're changing the behavior for GDScript we should also change it for C#.

I would like some sort of consensus on this before proceeding with adding test cases.

Makes total sense, I just wanted to note that this method doesn't currently have unit tests.

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MewPurPur commented Jan 26, 2023 •
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Also I don't really know where to add such tests. We have tests on the engine funcs, but I can't find anything for the GlobalScope. Few of the math functions in variant_utility aren't carbon copies of ones used in the engine, which are tested in math funcs. Which is why I'm not so sure about the PR--

@MewPurPur MewPurPur requested a review from a team as a code owner January 26, 2023 19:46
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MewPurPur commented Feb 9, 2023 •
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Stripped this PR a bit and its compat-breaking aspects. Now it's just a performance boost for GDScript and documentation tweak.

Should be safe, but it's not that important. Can wait for after 4.0

p.s. Should change label from bug to performance, given this.

@MewPurPur MewPurPur changed the title Fix edge cases of nearest_po2() Improve performance of nearest_po2() Feb 9, 2023
@akien-mga akien-mga modified the milestones: 4.0, 4.x Feb 9, 2023
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MewPurPur commented Apr 12, 2023 •
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Weirdly enough, I don't measure the performance boost I previously did. I have no idea why, previously I measured a 30% boost when the function had extra steps. Maybe I benchmarked poorly. Or maybe something else happened that optimized it.

Anyway, I'm yet again reshaping this. Now it's just a documentation PR lol

@MewPurPur MewPurPur force-pushed the fix-nearest-po2 branch 2 times, most recently from 02b80ab to bdbc619 Compare April 12, 2023 20:52
@MewPurPur MewPurPur changed the title Improve performance of nearest_po2() Improve documentation of nearest_po2() Apr 12, 2023
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pokey pokey!

@kleonc kleonc removed the performance label Aug 5, 2023
@akien-mga akien-mga modified the milestones: 4.x, 4.2 Aug 7, 2023
@akien-mga akien-mga merged commit 3fa5a15 into godotengine:master Aug 7, 2023
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Thanks!

@MewPurPur MewPurPur deleted the fix-nearest-po2 branch August 7, 2023 16:20
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@MewPurPur @raulsntos @akien-mga @kleonc @Calinou