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Visual glBlendFunc Tool

Started by AndersR May 30, 2010 at 7:07 PM 12 replies 6.1k views

Original Post

May 30, 2010 at 7:07 PM

Hi everybody. I recently needed a better overview over how glBlendFunc worked and I wanted a quick and easy way to test all kinds of parameters without having to recompile. It resulted in this HTML5 tool: (it requires Firefox, Chrome or Opera)
http://www.andersriggelsen.dk/OpenGL/

It supports all the parameters glBlendFunc() takes and you can also specify a color for glBlendColor.

There is also a checkbox for using premultiplied alpha textures.

What do you think? Is it helpful to you in any way? :)

MarkS

May 30, 2010 at 10:40 PM

This is awesome, but I'd prefer a standalone app where I can input my own images. The concept is excellent though.

Hodgman

May 30, 2010 at 10:58 PM

Pretty neat tool ;)

As above, it would be cool if you could supply your own images (maybe you could let the user enter 2 URLs?), or at least be able to see the RGB and Alpha channels of the built-in images.

AndersR

May 31, 2010 at 3:45 AM

Supplying your own images should be simple though, I will add that :)

Also being able to see the alphachannels seperately is a good idea. Will add that :)

AndyEsser

May 31, 2010 at 4:22 AM

Very very helpful, it's just found it's way into my bookmark list.

Well done and thank you!

AndersR

May 31, 2010 at 9:01 AM

I have added those features now.
Do a hard refresh by pressing Ctrl+F5 if you have the old page cached.

I'm currently trying to find a way to get around a &#106avascript security feature that removes the ability to load remote images from other websites.<br>

swiftcoder

May 31, 2010 at 9:18 AM

Quote:
Original post by AndersR
I'm currently trying to find a way to get around a &#106avascript security feature that removes the ability to load remote images from other websites.</td></tr></table></blockquote>You need a server-side script (generally in php), which resides on your server (so that &#106avascript can access it), and proxies the remote image (since php doesn't have the same security restriction vis a vis remote sites).<br><br>If you google for 'AJAX proxy', you should get many results.

AndersR

May 31, 2010 at 11:23 AM

Quote:
Original post by swiftcoder
You need a server-side script (generally in php), which resides on your server (so that &#106avascript can access it), and proxies the remote image (since php doesn't have the same security restriction vis a vis remote sites).<br><br>If you google for 'AJAX proxy', you should get many results.</td></tr></table></BLOCKQUOTE><br><br>Yeah, I was hoping I could get around the problem another way (security concerns) but it seems that is impossible. I have made a simple proxy script now. Ctrl+F5 to be sure you have the latest copy running in your browser :)<br></td></tr></table></blockquote>

MarkS

May 31, 2010 at 11:29 AM

Very nice!

AndersR

Jun 2, 2010 at 4:59 AM

I have just added an option for glBlendEquation. You can now visualize three times as many effects as before :)

MathewS

Jun 2, 2010 at 5:30 AM

Not too bad, didnt expect to see this using HTML5

Quote:
Original post by maspeir
This is awesome, but I'd prefer a standalone app where I can input my own images. The concept is excellent though.

I found this one not too long ago, http://www.codehead.co.uk/glsandbox.html

AndersR

Jun 2, 2010 at 6:06 AM

I chose to do this in HTML5 since you could keep it as a bookmark and access it from any computer without having to install any software.
I actually started implementing a little in a standalone application but realized the HTML5 version had more benefits for what I needed it to do (except for maybe execution speed).

Dim_Yimma_H

Jun 4, 2010 at 1:29 PM

This seems pretty useful. Bookmarked it!

Gabriev

Jun 5, 2010 at 2:46 AM

Nice online tool!
Thank you

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