cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   cublah
   Member

   What happened to the page turn transition? It's all spiky as it goes off screen.

   I would really like to use this transition can anyone provide any insight?

   Posted 1 month ago #
2. 

   cublah
   Member

   anyone?

   Posted 1 month ago #
3. 

   riq
   Key Master

   you are using a depth buffer, right ?

   Posted 1 month ago #
4. 

   crmagicxxx
   Member

   @Riq

   I saw that default depth buffer is kDepthBufferNone. But if we change it to 16 or 24, so transitions like page turn can work, are there any performance issues that can emerge from a change? For example I know that changing pixel format from 16bit to 32bit greatly reduce FPS, but I don't know anything about depth buffer and its impact on FPS...

   Thanks

   Posted 1 month ago #
5. 

   riq
   Key Master

   @crmagicxxx: It will consume more memory, and probably it might be a little bit slower when rendering some scenes... but I didn't do any performance test, so I'm not sure.
   Are you interested in doing them ?

   Posted 1 month ago #
6. 

   crmagicxxx
   Member

   Ok Riq, I can do it, just tell me how? :)
   Should I open your standard performance test and compare results or what? For particles, sprites and touches?

   Posted 1 month ago #
7. 

   riq
   Key Master

   @crmagicxxx:
   I think that the depth buffer will affect the rendering, so the test that I would do is:

   - Use the sprite performance test as a template, but I would create a new test (eg: DepthBufferPerformanceTest). I would use only the tests that do not trigger that "fill rate" limit, for example, tests 10-11-12, and I would include only the A tests.
   - So, I would add 3 options: 0-bit, 16-bit and 24-bit depth buffer.

   And another thing that I would do is to place the sprites at different Z values (OpenGL Z, not cocos2d Z).
   Example:
   sprite.vertexZ = random(-1000,1000);

   the 0-bit depth buffer should not perform worse than the 16-bit or 24-bit buffers. If so, something really strange is happening.
   Instead, it should perform a little bit better, but I'm not sure if it should perform better in all tests.

   Posted 1 month ago #
8. 

   crmagicxxx
   Member

   Ok, I'll try doing what you suggested

   Regards

   Posted 1 month ago #
9. 

   cublah
   Member

   ah..ok I thought I had turned on the depth buffer but I was running from a test project and missed it.

   Posted 1 month ago #
10. 

    cublah
    Member

    Also is there a way so it doesn't show the back of the of the page as it's tearing of?

    Posted 1 month ago #
11. 

    cublah
    Member

    Ok...I enabled depth buffer and I still get some artifacts on the left hand side of the screen at the start of the animation, you do get them in the test transition as well but I think because it's landscape you don't see them that clearly (probably because of the type of images too).

    I did a test project and made a movie. http://www.purplezoo.com/pageturn2.mov

    Posted 1 month ago #
12. 

    riq
    Key Master

    @cublah: seems to be a bug. Can you reproduce it in v0.8.2 ?

    Posted 1 month ago #
13. 

    cublah
    Member

    I just built a project from scratch using 8.2 and it still happens. It only seems to happen on the left hand side when the animation starts, it looks possibly like a z buffer problem.

    Posted 1 month ago #
14. 

    riq
    Key Master

    @cublah: could you open a bug ? Probably I won't have time to fix it for v0.99/1.0, but in case you find the fix, could you also attach the patch ? thanks.

    Posted 1 month ago #
15. 

    cublah
    Member

    What's the link for posting a bug I haven't posted one in a while

    Posted 1 month ago #
16. 

    riq
    Key Master

    http://code.google.com/p/cocos2d-iphone/issues/list

    Posted 1 month ago #

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