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Intel Details Handling Anti-Aliasing On CPUs
MojoKid writes "When AMD launched their Barts GPU that powers the Radeon 6850 and 6870, they added support for a new type of anti-aliasing called Morphological AA (MLAA). However, Intel originally developed MLAA in 2009 and they have released a follow-up paper on the topic--including a discussion of how the technique could be handled by the CPU. Supersampling is much more computationally and bandwidth intensive than multisampling, but both techniques are generally too demanding of more horsepower than modern consoles or mobile devices are able to provide. Morphological Anti-aliasing, in contrast, is performed on an already-rendered image. The technique is embarrassingly parallel and, unlike traditional hardware anti-aliasing, can be effectively handled by the CPU in real time. MLAA is also equally compatible with ray tracing or rasterized graphics."
http://en.wikipedia.org/wiki/Embarrassingly_parallel
I think you need to do your research before being critical... embarrassingly critical it appears.
If it is "embarrassingly parallel", why not leave it on the GPU? Makes more sense to have it running on dozens to potentially hundreds of stream processors than a couple "free" cores on the CPU.
So, it basically blurs the image around areas of high contrast? Sounds like thats whats going on. Looks like it, too. I can understand why they are targeting this at mobile and lower powered devices: it kinda looks crappy. I might even say that no antialiasing looks better, but I'd really have to see more samples, especially contrasting this with regular MSAA. I suspect, however, that normal antialiasing will always look considerably better. For instance, normal AA would not blur the edge between two high-contrast textures on a wall (I think, since it is actually aware that it is processing polygon edges), while I suspect MLAA will, since it only sees an area of high contrast. Look at the sample image they post in the article: the white snow on the black rock looks blurred in the MLAA processed picture, while it has no aliasing artifacts at all in the unprocessed image. Its pretty slight, but its definitely there. Like I say, need to see more real world renders to really tell if its a problem at all or simply a minor thing no one will ever notice. I'll stick to my 4X MSAA, TYVM.
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Anti-aliasing, by definition, must be performed in object space or, possibly, in picture space. But it cannot be possibly carried out on an already rendered image. They must be trying to market some glorified blur technique under the anti-aliasing moniker. Nothing new here...
"Embarrassingly parallel" refers to a problem made up of many isolated tasks -- such as running a fragment (pixel) shader on millions of different fragments, or a HTTP server handling thousands of clients -- that can all be run concurrently without any communication between them.
It's odd that they use that term here, because the other anti-aliasing techniques are embarrassingly parallel as well.
SSAA (super-sampling) always renders each pixel n times at various locations within the pixel, and blends them together.
MSAA (multi-sampling) is basically the same as SSAA, but only works on polygon edges and is very dependant on proper mipmapping to reduce aliasing introduced when scaling textures.
This is Slashdot. Many here would be happy to admit to having an SO with whom they are having regular sex.
So would a lot of the people with SOs...
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It's a term of art commonly used in the field for a very long time. That you don't like it really doesn't matter at all to anyone but you.
It can work on any DX9 GPU without dedicated support. http://hardocp.com/article/2011/07/18/nvidias_new_fxaa_antialiasing_technology/1