Temporal AA with SSAA

that is whats happening for 2xAA T2

 

Stop spreading ATIs FUD

It is useful generally anywhere their is a alpha test.

 

From a quality perspective, yes. From a performance perspective, no.

 

I would like to see the options enabled with messages about the performance cost.

Just imagine a temporal mode equivalent to NVIDIES 6x mode

4x MSAA + 2x SSAA + 2TAA = 12X Mixed AA mode

Thier are games where x800 get's 200+ fps we need options that will increase the quality for these situations.

 

Supersampling using temporal AA might seem like a nice idea but you need to remember that Supersampling does more that just AA alpha test edges too. It will change the texture filtering across the entire screen since the entire scene is being shifted slightly every frame. This could introduce an excessive amount of flickering, which can be quite strange to look at.

 

Err why? Surely if that were occuruing then that would imply that your texturing filter system is unstable and hence itself generating aliasing.

 

Can you tell me anywhere that AA speeds things up? what else would we be talkign about?

 

I know you are probably just refering to (super|multi)sampling AA, but MIP mapping of textures is one place where AA speeds things up enormously.

 

I wasn't meaning to imply that aliasing is being generated.

A half a pixel shift is going make the bilinear filtered result be different. The sampling point in the texture has changed so what you will get will be different. May not be 'hugely' different but it is still different enough that high constrast edges in texture can appear to flicker ever so slightly. Higher refresh rate of course will lessen the impact.

 

Seems like my post has been overlooked...

 

Some cases are more prone to big variations in the final color: point sampling or no mipmapping, alpha testing.

 

I can't imagine this would look very good with just a single sample per pixel unless the frame rate was very high. And it would also blur out edges you actually want, like fine text. It could work if used selectively by an app on only the polygons that need it, but it would be much tougher to make something like that work as a control panel option.

Temporal AA works better as the number of samples increases, so the differences from frame to frame are minimized. And I can't think of a common case where blurring the edges of polygons would be detrimental to image quality.

 

We'll be seeing some temporal AA with SSAA soon.

 

"Volaaaaaaari..."

Isn't that super...subsampling?

 

And how is averaging these over time fundamentally worse than the errors due to the lack of antialiasing that would otherwise be going on?

 

If you're "shaking" the edges, you get a flicker at the edge.
If you're "shaking" the texture, you get a flicker over the whole area.

The flicker from shifting a texture half a pixel could give a intensity shift on par with the "edge flicker", but if you get it over a larger area it's much more visible. Just look at FSAAviewer, and compare the flicker on the edge with the flicker on the dots in the sample pattern.

I'd say it's still worth trying though.

 

no no, lol. More like on teh doodoo 5.

:shifts eyes

 

no it didn't really materialise.

a non ordered (but not pseudo random) pattern appeared in the 7206 drivers (3864 or something for xp) for 2x and 4x quality modes only which in every driver after that reverted to only showing up in d3d in games that didn't use fog.


I'm not sure why they were removed but I did notice that at least in opengl games in the 7206 with 2x quality AA it did produce some very odd screen tearing on my 8500.