Control: tags -1 + serious Hi,
Em qua, 21 de nov de 2018 às 02:10, Frank Heckenbach <f.heckenb...@fh-soft.de> escreveu: > > Hi Evgeny, > > > >After updating libftgl2 from version 2.1.3~rc5-5 to version 2.3.0-3, text > > >rendering in Megaglest is broken. Text is shown correctly in menus, but > > >text displayed in the game itself is replaced by white rectangles. > > > > Thanks for the report. > > > > Any idea of what's going on, Frank? > > > > For me it works in some menus, there are white squares in others. zaz, > > another application using ftgl, seems to work fine, while critterding > > also shows white squares. > > That's probably a consequence of a fix made by sammy in 2009(!) > (commit 29603ae: "Remove GL_BLEND tampering. It's the caller > application's responsibility to enable or disable blending"). > > For some reason, that patch (and a few others) hadn't made it into > Debian before and only now got in as a "bycatch" when we > synchronized everything. > > Though it is an incompatible change, it was a necessary one, since > what the library did before was wrong (which prompted a bug report > of my own, #742469 which would solve it for some particular cases > while adding a dependency on GL_GLEXT_PROTOTYPES). So the better > solution is probably the earlier (and now current) one which puts > the responsibility on the caller. > > I had seen the same problem in another test program recently, and in > this case it helped to add the following two lines in an appropriate > place. You can try the same in your code (shouldn't hurt if compiled > with older ftgl versions as well): > > glEnable(GL_BLEND); > glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); > > Or, if you like a better blending function (see my description in > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742469), you can > use this instead: > > #define GL_GLEXT_PROTOTYPES > > glEnable(GL_BLEND); > glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, > GL_ONE, GL_ONE_MINUS_SRC_ALPHA); I think that we should revert this change for the time being, though, because if it was working in this way for about a decade and the programs using FTGL worked "fine" despite having some bug there, there's no need to change this now and break applications with only a few weeks to fix this in 15+ other packages before the freeze. Otherwise we have to get the fix in several of this packages, which is way more difficult, specially if not well maintained in Debian, upstream or both. Cheers. -- Manuel A. Fernandez Montecelo <manuel.montez...@gmail.com>
