im having some trouble actually, your guide would be very appreciated slembcke

Oof. I still need to write up a migration guide to show how to easily port the old callbacks to the new ones. I meant to do it before releasing the Chipmunk 5 stuff, but it was just one more thing to do that was holding making a release.

thank you very much. clarity at last. :)

If you upgraded to Chipmunk 5, the collision system was vastly improved to provide more callbacks.

Basically there's 4 callbacks at various stages of a collision: Begin, Presolve, Postsolve, and Separate. You are not required to implement all these, only what you need, but it gives you much more flexibility in your app.

The new function to add a collision handler is:

void cpSpaceAddCollisionHandler(
        cpSpace *space,
        cpCollisionType a, cpCollisionType b,
        cpCollisionBeginFunc begin,
        cpCollisionPreSolveFunc preSolve,
        cpCollisionPostSolveFunc postSolve,
        cpCollisionSeparateFunc separate,
        void *data
)

so if you want to continue using your old code, just use your current callback function as the Begin callback, and put NULL for the rest.

eg. cpSpaceAddCollisionPairFunc(_gameSpace, 0, 1, &spriteCollision, NULL, NULL, NULL, self);

The callback function itself has also changed slightly to:

typedef int (*cpCollisionBeginFunc)(cpArbiter *arb, struct cpSpace *space, void *data)
typedef int (*cpCollisionPreSolveFunc)(cpArbiter *arb, struct cpSpace *space, void *data)
typedef void (*cpCollisionPostSolveFunc)(cpArbiter *arb, struct cpSpace *space, void *data)
typedef void (*cpCollisionSeparateFunc)(cpArbiter *arb, struct cpSpace *space, void *data)

The callback setup was the only change I had to make when upgrading Chipmunk in my current Cocos 2d v0.8.2 project.

Make sure you have the latest Chipmunk (v5.1) which is available in the latest Cocos2d revision on SVN. In Chipmunk v5.0 a return 0 (ignore collision) in the BEGIN stage of the collision did not translate over to the rest of the stages.

In addition, Chipmunk 5+ also added a nice feature that basically allows you mark a shape for deletion in a collision callback. It's called a Post Step callback. As you may or may not now, you cannot delete a shape involved in a collision within a collision callback (or the app will crash), so I thought this was really nice new feature :)

More info on all of this can be found here: http://code.google.com/p/chipmunk-physics/wiki/CallbackSystem

- kalx

turns out it was!, im too far into a project to look at upgrading my knowledge to chipmunk 5.0, time to roll back chipmunk!

sorry for the triple post!, i've worked out what it is, i do have the right libs in place, but my cpSpace.h and cpSpace.c don't have declarations for cpSpaceAddCollisionPairFunc

Was this depreciated and changed for another function in chipmunk 5.0?

Ld build/Release-iphoneos/game.app/game normal armv6
cd /Users/user/Documents/Games/game-tilemap
setenv IPHONEOS_DEPLOYMENT_TARGET 3.1.2
setenv MACOSX_DEPLOYMENT_TARGET 10.5
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.2.sdk -L/Users/user/Documents/Games/game-tilemap/build/Release-iphoneos -F/Users/user/Documents/Games/game-tilemap/build/Release-iphoneos -filelist /Users/user/Documents/Games/game-tilemap/build/game.build/Release-iphoneos/game.build/Objects-normal/armv6/game.LinkFileList -mmacosx-version-min=10.5 -dead_strip -all_load -ObjC -miphoneos-version-min=3.1.2 -framework CoreGraphics -framework Foundation -framework OpenGLES -framework QuartzCore -framework UIKit -framework AudioToolbox -framework OpenAL -lz -framework AVFoundation "-lcocos2d libraries" -o /Users/user/Documents/Games/game-tilemap/build/Release-iphoneos/game.app/game

Undefined symbols:
"_cpSpaceAddCollisionPairFunc", referenced from:
-[ControlLayer init] in ControlLayer.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

this is the error im getting, ive looked on google and someone things this is a missing lib error? but i cant tell which

I have this error popping up every time i try to compile and i'm not sure what is causing it. i have the following code in my init

cpSpaceAddCollisionPairFunc(_gameSpace, 0, 1, &spriteCollision, self);

and this code above the implementation of my scene

static int spriteCollision(cpShape *a, cpShape *b, cpContact *contacts, int numContacts, cpFloat normal_coef, void *data) {

NSLog(@"collision detected!");

return 1;
}

ive got 2 sprites in the scene, with collision types 0 and 1 on them, i've given them shape data and added it to the gamespace

I'm completely stumped!