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Chipmunk Physics • View topic - Chipmunk breaking, but only on one platform

Chipmunk breaking, but only on one platform

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Chipmunk breaking, but only on one platform

Postby mcc » Sat Mar 19, 2011 4:15 am

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Re: Chipmunk breaking, but only on one platform

Postby ndizazzo » Sat Mar 19, 2011 9:17 am

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Re: Chipmunk breaking, but only on one platform

Postby slembcke » Sat Mar 19, 2011 10:55 am

Hmm. My initial reaction was that cpShapeCacheBB() was not being called before the query somehow, but it's called on the line before it. Have you tried stepping the debugger into cpShapeCacheBB()? Each shape type has a little vtable-like struct with function pointers in it. Basically all cpShapeCacheBB() does is call cpPolyShapeCacheData(), cpCircleShapeCacheData(), or cpSegmentShapeCacheData() based on the type of the shape. Try looking at what is going on in those functions. Maybe the issue is happening before that even?

My next best guess is that you are compiling for an Android phone without an FPU and using the -ffast-math flag. The -ffast-math flag tells the compiler to generate code to deal nicely with NaNs and infinity. Every FPU I've ever heard of handles infinity just fine, and only chokes when dealing with NaNs. Chipmunk uses infinity heavily, but has no need to use NaNs anywhere as an error condition. When using software FPU emulation and -ffast-math, it causes all the calculations that involve infinity to get screwed up.
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Re: Chipmunk breaking, but only on one platform

Postby mcc » Sat Mar 19, 2011 12:29 pm

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Re: Chipmunk breaking, but only on one platform

Postby mcc » Sat Mar 19, 2011 2:42 pm

Still working on gdb, however #android-dev claims and web research confirms that the the Android emulator in fact uses soft fpu because it's supposed to mimic the least-common-denominator phone (which is really weird, since you instantiate emulators for specific versions of android and the recent versions of android don't even run on the softfpu phones!). Hm...
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Re: Chipmunk breaking, but only on one platform

Postby mcc » Sat Mar 19, 2011 8:36 pm

[REDACTED]

Update 2: Problem was in my code... due to an error in init, the aspect ratio was equal to 0 and I was creating segments that actually did have NaN as coordinates!!! (cpv(-1/aspect,-1), etc) Experimenting further...

It does make me wonder about cpAsserts checking isfinite on user input inside say the cpshapenew functions... that would have caught this.

Update 3: Fixed aspect ratio (and, thus, input to Chipmunk) and it works now. Thanks for the help
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Re: Chipmunk breaking, but only on one platform

Postby slembcke » Sun Mar 20, 2011 1:47 pm

Yeah, I sprinkle new asserts in as I think about them or people find ways where they can get bad data into the system. I've added a bunch more in Chipmunk 6, but I don't really go to find every conceivable input.
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