MSAA, Alpha to coverage, gamma correction...

[Graham]

Hi. A few questions.

Regards gamma correction during msaa resolve, is there any easy way (in DX9) to detect if msaa gamma corrected resolving is occurring. Ideally I'd like to disable it, but I don't see that being possible in all cases.

I'm guessing I'm going to have to do a rendered test case to calculate the approximate gamma value being used (or 1 if not..).
Then again I'm expecting most cards don't even do true gamma 2.2, just a rough approximation - I may end up generating a lookup table I guess.

Also, with alpha to coverage, I haven't been able to find out what Ati cards support it. I can enable it fine enough, but do I simply assume all Ati DX9 cards support it? Is there a driver version I should look for?
Does Intel have a DX9 hack to enable AtoC on their DX10 parts?

Thanks all.



*************
Recently I haven't been visiting the forum anywhere near as often as I'd like to.
Whole load of reasons.. Things are slowly sorting themselves out

 

[Humus]

I can enable it fine enough, but do I simply assume all Ati DX9 cards support it?

Yes.

 

[Graham]

Yes.

thanks

 

[Graham]

Well I managed to work out the gamma curve used (it was actually a bit easier than I was expecting)..

Anyway. Here is the 8bit gamma curve on an 8800 (At least I *think* it is )