#jogamp @ irc.freenode.net - 20151215 05:05:09 (UTC)
20151215 05:05:09 -jogamp- Previous @ http://jogamp.org/log/irc/jogamp_20151214050509.html
20151215 05:05:09 -jogamp- This channel is logged @ http://jogamp.org/log/irc/jogamp_20151215050509.html
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20151215 09:03:07 <sgothel> https://www.youtube.com/watch?v=SQQwBfux9i0 <- 'for zuzub', "Watch how evil 'Kremlin propaganda bullhorn' REALLY work" :) - and good morning
20151215 09:04:35 <sgothel> https://www.youtube.com/watch?v=-DT7bX-B1Mg .. 'and it's gone' :)
20151215 09:12:24 <zubzub> sgothel: see, exactly the same is in the US ;)
20151215 09:13:20 <sgothel> http://www.zerohedge.com/news/2015-12-14/night-aleppo-scenes-syrias-most-war-torn-city <- example of 'free press' review
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20151215 09:14:35 <sgothel> but .. we have some official distractions going on now (FED, migrants/fugitives) .. while TPTB is doing theirs .. sure thing.
20151215 09:16:57 <sgothel> I am cynically amused that e.g. in Germany you hear about protesters of right/left clashing, while nobody seems to be interested in Germany sending its rubble military crap over to Syria .. to do exactly what? Not even collaborating w/ the legitimate local gov. .. sure thing. Bad politics costing more lives .. as usual.
20151215 09:18:24 <sgothel> ok .. however, hope you guys are fine and have a good Christmas and holidays, of course!
20151215 09:22:22 <ArToX> hi sgothel
20151215 09:22:50 <sgothel> hi .. afk .. 20minutes
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20151215 09:43:35 <elect> hi sven, you too
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20151215 11:04:05 <bruce-> are there ways to tell png loaders/writers how to deal with alpha channels?
20151215 11:04:23 <bruce-> there is this pesky pre multiplied alpha thing
20151215 11:04:58 <sgothel> our own png reader just delivers what is given 1:1
20151215 11:05:10 <sgothel> i.e. not doing any pre-mul
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20151215 11:06:24 <sgothel> writer .. depends on the pixel / framebuffer format
20151215 11:07:12 <bruce-> I now added some extra steps to pre-multiply and de-multiply alpha channels in my code as premultiplied alpha is in most cases not what I want
20151215 11:07:41 <sgothel> then simply read png files with alpha ..
20151215 11:07:58 <sgothel> it gives you 4 channels rgba
20151215 11:08:49 <sgothel> just check our unit tests if unclear ..
20151215 11:09:35 <bruce-> no, it works fine, just wondered if this is something that I am supposed to be doing
20151215 11:10:51 <sgothel> if your framebuffer has alpha you don't need pre-mul alpha - still render order may apply (back -> front) incl. culling
20151215 11:12:00 <bruce-> I need pre multiplied alpha when saving framebuffers to png, else the pngs will be displayed incorrectly
20151215 11:12:18 <sgothel> that is new to me ..
20151215 11:12:53 <sgothel> i.e. write/read 32bpp rgba works
20151215 11:13:03 <bruce-> it works, but it does not look good
20151215 11:13:30 <sgothel> IMHO we even have a unit test comparing the bytes .. hmm
20151215 11:13:55 <sgothel> so dunno about the 'looks' .. there should be no deterioration
20151215 11:14:06 <sgothel> 'signal loss'
20151215 11:15:10 <sgothel> but rendering rgba surely differs according to the alpha filters/equations
20151215 11:17:58 <sgothel> http://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/opengl/util/texture/Texture.html <- I added an 'alpha-premul' chapter here
20151215 11:38:48 <sgothel> need to decorate the pine tree for our traditional winter solstice celebration (some call it Christmas :)
20151215 11:39:02 <sgothel> https://en.wikipedia.org/wiki/Solstice
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20151216 05:05:09 -jogamp- Continue @ http://jogamp.org/log/irc/jogamp_20151216050509.html