crash only in release at first NewtonUpdate

[syl]

Hello,

i'm currently in the process of experimenting newton with batterytech http://www.batterypoweredgames.com/batterytech
It's an abstraction framework for win32,ios,android,macosx, and currently i've tested newton only on a win32 project. It abstracts file paths, some os api, and GL functions to address a subset of GLES in order to code a game for iphone/android and at the same time for Desktop. It uses mingw, but i feel like it does not follow _MINGW_32_VER (i dont know why)

I had, without too much pain (look at wiki, i had to patch core\dgThreads.cpp and generally simd), been able to include Newton in my gamecode.

Here's my problem (and the workaround i found, it's self-explanatory)

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      // without this test, i had a crash (only in release...), after having to move the creation of the newtonWorld elsewhere than with my first test
      if ( context->tickDelta > 1 ) {
         //TODO test Newton
         // here we tick the simulation
         NewtonUpdate(world->newtonWorld, context->tickDelta);
      }



So, what could happen, knowing that it DOES NOT happen in DEBUG mode ?? Threading or memory locking problem ? and yeah, it's 1, with 0 it's still crashing


OK, you may have a problem to help me with so less informations, so here's a bit more : wiki part i contributed http://newtondynamics.com/wiki/index.ph ... 0_Tutorial


Concerning Newton, it works great (currently i have both bullet and newton, showing balls falling at the same speed from the same origin, so that's the only problem)

Ok, if you have a suggestion also concerning my integration of newton, dont hesitate

[Julio Jerez]

I would try to run on a single thread and and without simd first see if the problem goes away.
then after that enblle simd, my guess ther is some unligned instruction some where.

[syl]

i'm loading with that init :

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   context->world->newtonWorld = NewtonCreate();
   NewtonSetThreadsCount(context->world->newtonWorld, 1);
   NewtonInvalidateCache(context->world->newtonWorld);


this should run only one thread, or do it needs something else ?

Also, i've setup _SCALAR_ARITHMETIC_ONLY in defined symbols for preprocessor, is this OK to disable SIMD ?

it seems that the problem is solved if I boot early.

[Julio Jerez]

it seems that the problem is solved if I boot early.

what is boot early?

[syl]

I meant that by initializing newton (calling NewtonCreate) earlier, the problem disappears

please excuse my English

[JernejL]

newtoncreate should be the first thing you do before using any other newton functions.

[syl]

Yes, i know. In any case, i was calling it first. The crash appears if i do not wait a bit before using newton.

[Julio Jerez]

how did you get the pointer to the newton world if you did no call NewtonCreate?

you musted be passing a wrong word pointer.