RG/SGSSAA

[Gabbyjay]

I observed some other interesting thing:


If you set 4xFSAA in the OGL-Plugin, I'm very, very certain that you always get SGSSAA (you don't need to activate anything in the drivers)!

I can tell only by looking at it by eye of course, i got no technical information supporting this observation, but I am very certain that this is SGSSAA and not OGSSAA.

[xemnas]

(10-09-2013, 05:28 AM)Gabbyjay Wrote: If you set 4xFSAA in the OGL-Plugin, I'm very, very certain that you always get SGSSAA (you don't need to activate anything in the drivers)!

Do you mean 4x SSAA?

[Gabbyjay]

Quote:Do you mean 4x SSAA?

Yes.

[Gabbyjay]

Got 9xSSAA working in F-Zero GX now.

Here are some examples.
Remember it's only in motion where you can see the full impact of the differences!
It's hard to see this in screenshots, nevertheless i can show you the difference.

The first comparison is to show you that 8xSGSSAA can provide better results than 9xOGSSAA even in textures (!), not only polygon edges.
We got several filters working on textures already, nevertheless you can see the difference.

9xOGSSAA:
http://i.imgur.com/dGTDOj9.png


8xSGSSAA:
http://i.imgur.com/vSUeytd.png


Textures are smoother here, which makes the difference in motion.
Also, the moirees on the left side are gone.

To prove that this is just about textures and not polygon edges, here's the wireframe shot of this scene:
http://i.imgur.com/bvCiHru.png



----

The second comparison is more about moirees.

No AA:
http://i.imgur.com/2Qr34yz.png


9xOGSSAA:
http://i.imgur.com/uEa4nuZ.png


8xSGSSAA:
http://i.imgur.com/8IFKNV4.png



OGSSAA does almost nothing against moirees here, with SGSSAA they are much better.

[Shonumi]

Thanks for testing more games Gabbyjay. You brought up an interesting point that Dolphin may already be using SGSSAA in OpenGL. I have personally tested moire patterns in Xenoblade Chronicles in multiple places. Everytime, 4xSSAA is able to eliminate them and causes the same IQ results from your 8xSGSSAA picture in F-Zero. I'm going to try forcing 4xSSAA through Nvidia's drivers to see if the results differ. Nvidia's 4xSSAA through its drivers actually combines it with 2x MSAA, but since MSAA doesn't work on textures, it shouldn't affect the images if I'm just looking at textures (again, I've found textures to be the most common place for moire patterns to occur). I can post the results if they interest you. I'll talk to someone to see if the code is using SG rather than OG so you'll have an answer for sure (or maybe a dev will answer it here before then).

[Gabbyjay]

I'm pretty sure the OGL 4xSSAA solution is a SG pattern.
You can also tell by looking at the edges.
There are 3 levels of color transitions where there only should be two in OGSSAA.

[Shonumi]

Hmm... Dolphin doesn't like it when I try to force Nvidia's AA. I can't test 4xOGSSAA for comparison, which kinda sucks

[Gabbyjay]

Try 0x00008000 .

But it doesn't work for me in this revision either.

NaturalViolence claims he got it working, but I still wait for his explanation on the correct settings.

[xemnas]

I try setting SSAA in AMD CCC but it seems that it doesn't affect Dolphin at all.

[Gabbyjay]

Hm AMD drivers provide less options to make it work, unfortunately. That's one of the reasons why I'm using an nVidia card at this time...

Hopefully you can get it to work somehow, try both DX11 and OGL plugins. Remember to set MSAA in Dolphin.