Re: GLCanvas rendering differs among JVM version
Posted by Martin on Oct 20, 2015; 10:00am
URL: https://forum.jogamp.org/GLCanvas-rendering-differs-among-JVM-version-tp4035514p4035527.html
URL: https://forum.jogamp.org/GLCanvas-rendering-differs-among-JVM-version-tp4035514p4035527.html
To be honnest I am still hesitating to use Newt as default canvas instead of GLCanvas since :
-> NewtCanvasAwt does not downsize when it is embedded in a the following component hierarchy : JFrame -> swing.Miglayout -> JPanel -> jzy3d.CanvasNewtAwt extending either awt.Panel or JPanel -> NewtCanvasAwt (no problem if it stand the hierarchy JFrame -> jzy3d.CanvasNewtAwt )
-> part of jzy3d should be rewritten/replaced to appear as before (e.g. I liked the simple glutBitmapString but it is now sensitive to scaling as implemented in Jzy3d).
-> it has subtle but noticeable glitches :
---> there's sometime a 1 second delay to wait before the canvas react to mouse events (parenting phase?)
---> canvas resize in one step instead of resizing in multiple steps when the window is magnified (mac os animates window resizing)
---> canvas is blinking when I resize the window manually (probably a consequence of previous point)
---> sometime initializes with gray square out of frame for a very short time
---> although not able to reproduce now, I sometime had the initialized chart in a small square instead of full canvas size (by the way, that square seems to have the same size as the above mentioned gray square).
I hope I didn't sound severe, I just wanted to provide you with a general feedback after running Newt on multiple jzy3d demos.
Portability remains a huge advantage, and also final rendering is more beautiful than GLCanvas rendering.
2015-10-20 11:45 GMT+02:00 Martin Pernollet <[hidden email]>:
Yes that's the point : NewtCanvasAwt behave consistently across JRE versions on MacOSX 10.8.5, whereas GLCanvas does not.The things that changed in Newt compared to GLCanvas are not a big problem as long as they will alway appear the same way across JRE versions, Windowing Toolkits (SWT/AWT), GPU, OS (I understand how hard is jogamp's mission :).Regards, and many thanks again for your help and huge work.2015-10-19 17:14 GMT+02:00 Sven Gothel [via jogamp] <[hidden email]>:On 10/19/2015 02:26 PM, Martin [via jogamp] wrote:
> Hi,
>
> I noticed rendering differs among different JVM with JOGL 2.3.2 : in these two
> examples, left window is 1.6 and right window is 1.8 (details below).
>
"on MacOSX 10.8.5"
^^ this was the most critical delta next to the JRE version (not JVM),
since 1.7* AWT uses an CALayer on OSX, which can only be utilized by
us via a FBO -> texture rendering.
Note: That means no more direct on-screen rendering since,
but FBO to texture, where the latter is being used for the
CALayer 'final compositioning'.
> * text size of axis box differ (it uses GLUT.glutBitmapString)
> * aliasing settings are not the same (1.8 version is cleaner than 1.6)
> * alpha values are handled differently (1.8 appears lighter than 1.6)
> * colorbar is not rendered properly on its translucent part (where text stand)
> : it is initially a Java2d image rendered by gl.getGL2().glPixelZoom,
> glRasterPos3f and then glDrawPixels)
Looks like there are many changes:
- FBO color space?
- Scaling ? HiDPI ?
- Java2D + GL mixing
- Translucency ?
It would be helpful to describe each difference separately
and let us analyze them, but lets continue below first:
>
> And I just change JVM not JOGL or JZY3d versions.
Yup.AWT CALayer mechanism as GLCanvas for JRE >= 1.7* (see above).Note: NewtCanvasAWT has to use the same
>
> Important : all pictures are based on *GLCanvas* for AWT.
>
> *Are these known issues?*
>
> http://download.jzy3d.org/jogldiscuss/jzy1.0-jogl2.3.2-surface.png
> http://download.jzy3d.org/jogldiscuss/jzy1.0-jogl2.3.2-scatter.png
>
> ---------------------------------------------------
> Now if I use *NewtCanvasAWT* on jogl 2.3.2 I can see both version (6/8)
> rendering the same way : as GLCanvas renders on 1.8 (better aliasing, smaller
> text) without bug (no pb rendering alpha off Java2d images).
Just to make sure to not misunderstand, you say that:
- NewtCanvasAWT behaves 'well' or 'as expected' on all JRE versions
(onscreen and offscreen).
- NewtCanvasAWT and GLCanvas behave 'well' or 'as expected' on JRE >= 1.7*.
so, to make a long story short:
- GLCanvas does _not_ behave 'well' or 'as expected' on JRE 6 (onscreen).
>
> *Should we throw away GLCanvas?*
B/c it does not behave well on JRE 6 on OSX?
Well, that is your decision ofc.
Indeed, a NEWT Window behaves more deterministic due to the simple
fact that this is our code base, i.e. we cannot influence AWTs
behavior that much.
And surely I favor NEWT and NewtCanvasAWT, for this and many other reasons
like better input responsiveness, see:
<http://jogamp.org/jogl/doc/NEWT-Overview.html>
Then it will also be easier to make the NEWT based application
AWT agnostic, i.e. portable for other [embedded] platforms.
Hope this helps a bit.
Cheers, Sven
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