Games using the Chipmunk4PB wrapper (2D physic engine)

[AndyLy]

The error occurs here:

Code: Select all

ProcedureC col_begin2(*arb.cpArbiter, *space.cpSpace, *pData)
  Protected *bodyA.cpbody = *arb\private_a\body
  Protected *bodyB.cpbody = *arb\private_b\body  
tmpvar=(Abs(*bodyB\v\x)+Abs(*bodyB\v\y))
If tmpvar>BrickDestrucKf:  cpSpaceRemoveBody(*space, *bodyB): cpBodyFree(*bodyB)
  cpSpaceRemoveShape(*space, *shapeB): cpShapeFree(*shapeB): EndIf
  ProcedureReturn #True
EndProcedure

While I can not understand why, it occurs in a random manner.
And when you exit the program if all the glass bricks are broken - crash here.

Code: Select all

cpSpaceFree(*space): cpBodyFree(*staticBody)

[gnasen]

try this order:

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cpSpaceRemoveShape()
cpShapeFree()
cpSpaceRemoveBody()
cpBodyFree()

[AndyLy]

Still crashes on exit, in a random manner. On line : cpSpaceFree (*space)

Something wrong with the removal of objects. The longer you play - the more likely the crash.
to gnasen : And how are you delete them?

[gnasen]

Still crashes on exit, in a random manner. On line : cpSpaceFree (*space)

Something wrong with the removal of objects. The longer you play - the more likely the crash.
to gnasen : And how are you delete them?

Without any code I can just guess. If you use a list with the objects, be sure that you delete the element connected with the body and shapes from the list itself.
If you could post a working example, I could have a look at it.

[AndyLy]

Need Chipmunk4PB_v0.4.pbi, my dll and resources.
https://rapidshare.com/files/827199597/My_project_3.pb

[gnasen]

...Need Chipmunk4PB_v0.4.pbi, my dll and resources...

yes, and I need them, too I can only try to debug runable code. Otherwise its just hell.

[AndyLy]

Dll and resources you already have (you downloaded the previous example).
Нere Chipmunk4PB_v0.4.pbi :
https://rapidshare.com/files/1077635616 ... B_v0.4.rar

[gnasen]

ah okay, now I see the problem.
You delete the body/shape, while you are in the callback. So you are removing it while chipmunk is still working with it. So if your callback is left and chipmunk tries to access the body/shape, it gets an invalid memory access.
you have to use Post-Step Callbacks, just see in the manual.
Honestly I dont use it, because I just gather all information in the callback and store it to a collision list. After chipmunk has done its timestep, I handle all collisions and can delete/add/modify whatever I want.

[AndyLy]

I tried to copy the objects into a single list and remove them after cpSpaceStep (* space, dt), but there was crash program.
I've done this:
Structure object: body.cpbody: shape.cpshape: mydata.i: EndStructure: Global NewList obj.object ()
.........
; In ProcedureC col_begin ()
CopyStructure (* bodyB, obj (), cpbody)
......................
; After cpSpaceStep ()
ForEach obj (): cpSpaceRemoveBody (* space, obj () \ body): next

use Post-Step Callbacks, just see in the manual

Yes I watched the manual but it is in C, I did not understand.
Can give an example for PureBasic, working with the Post-Step Callbacks? I would appreciate it.

[AndyLy]

In general, a couple of cups of coffee and some cigarettes, and I was able to write PostStep () handling to remove blocks.
At the moment everything is working. I will try other options. Thanks again for your help.
Hopefully in the future, you do not refuse to advice if necessary.

[gnasen]

Nice, as I see you learn fast no problem, if I have time I will try to help you, just ask.

[IceSoft]

Nice, as I see you learn fast no problem, if I have time I will try to help you, just ask.

Thanks for your help by me too.

[AndyLy]

Nothing really new, just corrected the bugs and added a goal to drop the large board with the right edge, with a single shot.
Right mouse button, increase the strength of the shot. Left-fire.

https://rapidshare.com/files/109141931/examp.rar

[gnasen]

Well done, I think youve already created more complicated things then I ever did in chipmunks!
I guess you want to create a "trebuchet vs fort" game?

[AndyLy]

Well done, I think youve already created more complicated things then I ever did in chipmunks!

What can I say, I'm a genius.

I guess you want to create a "trebuchet vs fort" game?

I do not know what it is.
While the idea of ​​the game is in the air. I do not know yet, realizing something playable or not.