Bug 59380 - Incorrect GKPath.FromPoints (Vector3[], float, cyclical) implementation
Summary: Incorrect GKPath.FromPoints (Vector3[], float, cyclical) implementation
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: master
Hardware: PC Mac OS
: --- normal
Target Milestone: Future Cycle (TBD)
Assignee: Alex Soto [MSFT]
Depends on:
Reported: 2017-09-11 08:33 UTC by Rolf Bjarne Kvinge [MSFT]
Modified: 2017-09-11 19:30 UTC (History)
1 user (show)

Is this bug a regression?: No
Last known good build:

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Description Rolf Bjarne Kvinge [MSFT] 2017-09-11 08:33:38 UTC
See: https://github.com/xamarin/xamarin-macios/blob/96067ef1c1ff84280f5aac7011fa3c8d60a0b7ad/src/GameplayKit/GKPath.cs#L54

The native signature is:

> - (instancetype)initWithFloat3Points:(vector_float3 *)points count:(size_t)count radius:(float)radius cyclical:(BOOL)cyclical NS_AVAILABLE(10_12, 10_0)

that's an array of vector_float3.

vector_float3 is 16 bytes, which means the binding is incorrect, because Vector3 is 12 bytes, and our code does not that difference into account.
Comment 1 Rolf Bjarne Kvinge [MSFT] 2017-09-11 08:36:36 UTC
@Alex, git blame blames you 🙂
Comment 2 Alex Soto [MSFT] 2017-09-11 15:47:52 UTC
I'll take the blame :)

PR: https://github.com/xamarin/xamarin-macios/pull/2644
Comment 3 Alex Soto [MSFT] 2017-09-11 19:30:03 UTC
Fixed in xamarin-macios/xcode9 @ fdf67c6645702ff04f2dccd692c9caf1fdd726b8