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  AffineTransform with openGL Pipeline slower than without  (Read 2295 times)
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Offline quietschie

Junior Newbie





« Posted 2012-02-01 15:46:18 »

Hi Everyone,

i'm fetching bufferedImages from camera and want to scale them to whatever window-size is.
Therefore i use the AffineTransform like this
1  
AffineTransform xform2 = AffineTransform.getScaleInstance((double)getWidth() / myWidth, (double)getHeight() / myHeight);

where myWidth / myHeight hold the original Image width/height.
I draw the images via
1  
2  
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g2.drawImage(image, xform2, null);


this works fine with about 25 fps, but when i switch to fullscreen i only got about 7 fps left.
when i run the application with the openGL pipeline Option
1  
-Dsun.java2d.opengl=True
it slows down to 2 fps in small size.

Any idea highly appreciated.

quietschie
Offline theagentd
« Reply #1 - Posted 2012-02-01 15:55:43 »

Might be because you use bicubic interpolation. It's probably not hardware accelerated, but I'm no Java2D expert...

Myomyomyo.
Offline quietschie

Junior Newbie





« Reply #2 - Posted 2012-02-01 16:08:37 »

Wow,
removing this line gave me 3 more fps with openGL and more than the camera fetches without using openGL.

Unfortunately the quality is now poor.
So thank you, theagentd, this will work for my first draft.

But i'm still open for other solutions.

quietschie
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Offline theagentd
« Reply #3 - Posted 2012-02-01 18:23:55 »

Bicubic interpolation is really slow. Each pixel requires 4*4 samples from the image being rendered, so it's a lot of work. You can try VALUE_INTERPOLATION_BILINEAR, which is something in between nearest-neighbor (pixelized) sampling and bicubic sampling (it uses 2*2 samples). It won't look as good as bicubic of course, but it's usually much better than nothing at all.

Myomyomyo.
Offline pitbuller
« Reply #4 - Posted 2012-02-01 19:14:08 »

Bicubic interpolation is really slow. Each pixel requires 4*4 samples from the image being rendered, so it's a lot of work. You can try VALUE_INTERPOLATION_BILINEAR, which is something in between nearest-neighbor (pixelized) sampling and bicubic sampling (it uses 2*2 samples). It won't look as good as bicubic of course, but it's usually much better than nothing at all.
And most important it's hardware accelerated(at least very often).
Offline Cero
« Reply #5 - Posted 2012-02-02 00:22:48 »

on windows java2D should default to directX, which is faster than opengl
generally java2d seems to work better with directx

just my impression though

Offline ra4king

JGO Kernel


Medals: 353
Projects: 3
Exp: 5 years


I'm the King!


« Reply #6 - Posted 2012-02-02 02:17:35 »

You can't really say "DirectX is faster than OpenGL" since they are both just specs and the driver is the one that implements them. Java2D seems to use DirectX better than OpenGL, which makes it run faster on it but that does not mean DirectX is overall "faster" than OpenGL.

Offline Cero
« Reply #7 - Posted 2012-02-02 13:44:40 »

Java2D seems to use DirectX better than OpenGL

Yes I meant this.

java2D using direct vs java2d using opengl: directx seems to win
has nothing to do with real opengl

Offline gouessej
« Reply #8 - Posted 2012-02-02 22:39:28 »

quietschie, if you want something faster, look at Slick or Agile2D.

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