Use glBlendFuncB for dstAlpha

[raven02]

This negate the blue effect on 3rd birthday while maintains Person 2 blend fix.

Issue #3354

[thedax]

Seems fine with Tactics Ogre, Pangya, and Half-Minute Hero, so no objections here.

[hrydgard]

Hm, I thought I tested this before, but I can't remember what problem it caused..

[thedax]

Probably a good idea to hold on merging this until @solarmystic runs through his usual tests.

[solarmystic]

@raven02 @thedax @hrydgard

Test report for your perusal (just had to alter the line as per the commit, pretty simple alteration):-

Observations of note:-

1. Final Fantasy 2's graphical regressions did not spawn from this commit. The issue is also present in the current master and is the return of a previous issue, Final Fantasy II (ULES00987) :- Minor graphical abnormality in status menuboxes since v0.8.1-634-g1abd9ff (Updated, issue has since returned in v0.9.1-222-g711d3ff)  #2857 (comment) due to a different responsible commit.
2. 3rd Birthday's thick blue fog (with just plain BR) has indeed been resolved with the alteration, but you can still see that it's not quite right yet in this screenshot. Note the tiny blue rectangular artifacts, and the blue "aura" around Aya's body. These are obviously not present with BR is turned off.

Still a massive improvement to what it was before anyway, and since it does not negatively affect any other games I have tested, it should be safe enough to merge.

[raven02]

@solarmystic Thanks for testing .

[hrydgard]

Alright then, let's try it.