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Compare two textures pixelwise (for test purpose)

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Martin

Compare two textures pixelwise (for test purpose)

For my non regression tests, I want to compare the TextureData of an offscreen chart with TextureData loaded from a png file.

Long time ago I used BufferedImage.getRGB(x,y) but it is AWT dependent and I would prefer to rely on the genericity of JOGL. However I can't find an equivalent of getRGB or getRGBA on TextureData, neither on Texture.

What would you suggest to do so?

Thanks

gouessej

Re: Compare two textures pixelwise (for test purpose)

Administrator

Hi

You can use getBuffer() but such a comparison would work if and only if both instances of TextureData use the same color space, the same pixel format, etc.

Julien Gouesse | Personal blog | Website

Martin

Re: Compare two textures pixelwise (for test purpose)

Hi again,

Not sure Buffer offers such an interface (getRGB(x,y))

http://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/util/texture/TextureData.html

lead to

http://docs.oracle.com/javase/6/docs/api/java/nio/Buffer.html?is-external=true

which as no getRGB

2015-10-16 15:34 GMT+02:00 gouessej [via jogamp] <[hidden email]>:

Hi

You can use getBuffer() but such a comparison would work if and only if both instances of TextureData use the same color space, the same pixel format, etc.
Julien Gouesse | Personal blog | Website | Follow me on Identi.ca

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gouessej

Re: Compare two textures pixelwise (for test purpose)

Administrator

You have to read the data in this buffer, sorry :s The RGB(A) components are stored into this buffer for sure.

Julien Gouesse | Personal blog | Website

gouessej

Re: Compare two textures pixelwise (for test purpose)

Administrator

In reply to this post by Martin

I have a class with a method to get the RGBA value from the byte buffer, I plan to move it into Ardor3D. Are you still interested in this feature?

Julien Gouesse | Personal blog | Website

Martin

Re: Compare two textures pixelwise (for test purpose)

Yes, this is an interesting thing to share, thank you Julien.

gouessej

Re: Compare two textures pixelwise (for test purpose)

Administrator

It's currently called ImageHelper. It allowed me to drop AWT typically when I wanted to modify the image data of a texture before sending it anew to the GPU. I'll copy it into JogAmp's Ardor3D Continuation next week.

Julien Gouesse | Personal blog | Website

gouessej

Re: Compare two textures pixelwise (for test purpose)

Administrator

In reply to this post by Martin

Done:
https://github.com/gouessej/Ardor3D/commit/9b8b30718a8b82221d1a75e4dce23dea8a19836c

In my humble opinion, those methods should be moved into JOGL itself, a texture data object should be able to tell which color is in each of its pixels.

Julien Gouesse | Personal blog | Website

Martin

Re: Compare two textures pixelwise (for test purpose)

I agree with you.

Thank you for sharing.

2015-11-02 22:00 GMT+01:00 gouessej [via jogamp] <[hidden email]>:

Done:
https://github.com/gouessej/Ardor3D/commit/9b8b30718a8b82221d1a75e4dce23dea8a19836c

In my humble opinion, those methods should be moved into JOGL itself, a texture data object should be able to tell which color is in each of its pixels.
Julien Gouesse | Personal blog | Website | Follow me on Identi.ca

If you reply to this email, your message will be added to the discussion below:
http://forum.jogamp.org/Compare-two-textures-pixelwise-for-test-purpose-tp4035481p4035710.html

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gouessej

Re: Compare two textures pixelwise (for test purpose)

Administrator

RFE:
https://jogamp.org/bugzilla/show_bug.cgi?id=1264

Julien Gouesse | Personal blog | Website