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2333 :: [Released on Nimble] nim-chipmunk7 demos

• matkuki (orginal) [2016-06-22T14:46:49+02:00] view original

  Chipmunk7 demos are coming to Nim. Here is a little preview: https://www.youtube.com/watch?v=Gg79LT1ItWo

  If anyone is interested, please post a reply to this post and I'll put a higher priority on the project.

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• Varriount (orginal) [2016-06-22T15:29:02+02:00] view original

  That looks really neat!

  Some questions:

  • What kind of framerate do you get?
  • What opengl profile are you using?
  • How hard was it to use chipmunk in Nim?

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• matkuki (orginal) [2016-06-22T16:18:33+02:00] view original

  What kind of framerate do you get?

  • 60fps (even the 3rd demo with 1000 hexagons bouncing around) on a CoreDuo 3.14GHz, 8GB, GeForce GTX 660. The video is slow and choppy because my machine is quite old and can't handle recording of the demos!

  What opengl profile are you using?

  • OpenGL 4.5.0 in gluOrtho2D mode, rendering is also selectable: OpenGL or SDL2(mix of SDL2 and SDL2_gfx)

  How hard was it to use chipmunk in Nim?

  • Fairly easy once you get the hang of the Nim naming convention. Setup the space, throw the bodies with shapes into it, then just use space.step(dt) every frame and render everything. Chipmunk even has a space.debugDraw function that you just pass it the procedures for rendering circles, polygons,... and Chipmunk does the rendering of the individual shapes for you. SDL2 handles the framerate and input.

  @Varriount: One of the C examples I was porting uses the __block functionality of the C compiler (if it supports it) and there is where I wanted to use the closures that I asked about in the Closures with {.cdecl.} post. I used global proc's instead.

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• Varriount (orginal) [2016-06-22T16:30:38+02:00] view original

  I'm assuming you mean the __block functionality usually used by Objective-C?

  What's interesting is that Objective-C blocks use a technique similar to Nim, in that an environment is captured and passed as a hidden parameter.

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• hcorion (orginal) [2016-06-26T04:28:51+02:00] view original

  Really cool! I'm glad you went to the effort of porting such an awesome 2D physics library to this platform. Can't wait to see the source code. Did you use c2nim?

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• matkuki (orginal) [2016-06-26T11:34:56+02:00] view original

  c2nim helped, yes. Will be on Nimble soon.

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• matkuki (orginal) [2016-09-24T21:00:36+02:00] view original

  It took some time but here it is: https://github.com/matkuki/chipmunk7_demos

  Also available on nimble:

   nimble install chipmunk7_demos
  Run

  Have fun!

  Matic

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