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RenderTextureTest failed in some android devices

Bug #507 [Closed] 2011-05-22 23:31 . Updated over 4 years ago

It runs well on xoom, while failed in huawei u8800.
A developer reported that it runs well on HTC G7, and filaed in G8.
It seems not correctly on wophone.

Maybe we have to trace the opengles calls 2011-05-22 23:32
  • Assignee set to huangrh
StrawberryMilkshake 2011-05-23 01:34

The Tests demo fails (@ the render to texture test) on my HTC Desire as well, but I did get it to work in my own app, without the issues.

How? I don’t know, it just worked :p But the demo shows random garbage.

StrawberryMilkshake 2011-05-25 23:51

I’ve been thinking a lot about it (because my game needs them to make things fast) and I think it’s best to “support” CCRenderTexture on devices without support for FBO in the following ways:

  • By preventing crashes or the dreaded “unimplemented opengl es api” message (or both :P ) by doing an internal check for GL_OES_framebuffer_object (see the following item for more about that).

  • By adding some kind of “isSupported” method @ CCRenderTexture. This is ugly, but at least it gives the developer the option to check for it and implement a way to fall back to another code path. I’m currently doing this in my game by checking the GL_EXTENSIONS string for GL_OES_framebuffer_object. If the extension is not there, it’s not supported. This is the only way to check for valid FBO support. Checking for GL1.1 or even GL 2.0 won’t necessarily mean that FBO is actually supported.

StrawberryMilkshake 2011-05-25 23:59

In addition to that, you could circumvent the missing FBO support by using glReadPixels, but I’m not sure if that’s the way to go because it will always be slow. The GLES driver will have to flush the pipeline to get the pixel data.

huangrh 2011-06-01 20:34

RenderTextureTest will crash on some machenes that use opengl es 1.0, because there are some extention functions not supported in version 1.0.
So, we will give a hint and ignore these tests acording to the gles version.

The garbled showing effect of RenderTextureTest on G7 is another problem, still being traced, please refer to

Thanks for Strawberry Milkshake’s advice! 2011-06-15 01:37
  • Target version changed from cocos2d-1.0.0-x-0.9.0 to cocos2d-0.99.5-x-0.8.5
zhangxm 2011-06-15 02:33
  • Status changed from New to Resolved 2011-06-23 01:05
  • Status changed from Resolved to Closed 2012-05-25 08:12
  • Project changed from cocos2d-x to cpp
  • Category deleted (5)
  • Target version deleted (cocos2d-0.99.5-x-0.8.5)
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Start date:2011-05-22
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