ScummVM IRC Log - 12 Jun 2016

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[00:51] <snover> outstanding issues: (1) looped samples are having breaks in them for some reason, even though that should be accommodated by the sci mixer; and
[00:51] <snover> (2) kq7 either has an annoying script problem where it requests to play the same sample on every frame even though the animation has not advanced, which was not a problem for the game itself because their audio code ran in the same thread, or there is some mystery bug somewhere else in the implementation that causes a problem
[00:53] <snover> if anyone is a masochist and wants to give a second set of eyes& https://github.com/csnover/scummvm/blob/sci32-kDoAudio
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[03:37] <GitHub183> [scummvm-web] aquadran pushed 1 new commit to master: https://git.io/vonBv
[03:37] <GitHub183> scummvm-web/master c1d4fea Pawel Kolodziejski: WEB: provide more packages
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[06:59] <GitHub34> [scummvm] fuzzie pushed 1 new commit to master: https://git.io/vonEb
[06:59] <GitHub34> scummvm/master ce9573c Alyssa Milburn: ANDROID: Relax manifest hardware requirements....
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[09:06] <waltervn> morning
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[09:38] <WooShell> good meowning =^.^=
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[16:12] <snover> almost there&
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[18:35] <snover> m_kiewitz: hey, are you able to help me out and tell me how to activate some sequence that uses TalkRandCycle in SQ6?
[18:36] <snover> I see that it is used from some different rooms but I havent figured out the exact condition yet.
[18:37] <snover> Also, if you have any thoughts about what the heck to do about that thing I mentioned about KQ7.
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[20:51] <GitHub164> [scummvm] sev- pushed 1 new commit to master: https://git.io/vonpV
[20:51] <GitHub164> scummvm/master e3fff12 Eugene Sandulenko: BBVS: Initialize SpriteModule class
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[21:36] <omer_mor> hi
[21:36] <omer_mor> anyone up for a short x86 assembly question?
[21:39] <snover> sure
[21:39] <omer_mor> great
[21:39] <omer_mor> what does this function do:
[21:39] <omer_mor> sub_tsnexec_24E2 proc near
[21:39] <omer_mor> arg_0= word ptr 4
[21:39] <omer_mor> push bp
[21:39] <omer_mor> mov bp, sp
[21:39] <omer_mor> cmp [bp+arg_0], 1
[21:39] <omer_mor> sbb ax, ax
[21:39] <omer_mor> inc ax
[21:39] <omer_mor> mov word_seg4F4_706, ax
[21:39] <omer_mor> pop bp
[21:39] <omer_mor> retn
[21:39] <omer_mor> sub_tsnexec_24E2 endp
[21:40] <snover> oh hey you didnt say it was 16-bit code, how unfair ;)
[21:40] <omer_mor> heh :-)
[21:40] <omer_mor> to me it looks like a simple (word_seg4F4_706 = arg_0)
[21:41] <omer_mor> but i must be missing something
[21:41] <omer_mor> actually i'm wrong
[21:41] <snover> sbb is a weird instruction
[21:42] <omer_mor> when arg_0 == 0, it will do that
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[21:43] <omer_mor> if arg_0 != 0, it'll set the word_seg4F4_706 to 0 ??
[21:43] <[md5]> good evening
[21:44] <Strangerke> hey, [md5] :)
[21:44] <[md5]> hey :)
[21:45] <omer_mor> so is it (word_seg4F4_706 = (arg_0 == 0)) ?
[21:46] <omer_mor> hi [md5]!
[21:46] <[md5]> hey omer_mor :)
[21:47] <snover> so, uh& if `arg_0 < 1` then CF will be set, which means `SBB ax, ax` will make `ax` be 0xFFFF, otherwise it will be 0
[21:48] <snover> then `inc ax` gives you a boolean
[21:49] <omer_mor> why arg_0 < 1 will set CF?
[21:50] <omer_mor> 0xFFFF will set CF?
[21:50] <snover> CMP sets CF and ZF
[21:51] <omer_mor> only after a carry has been done, no?
[21:51] <omer_mor> 0xffff - 1 = 0xfffe
[21:51] <omer_mor> w/o carry
[21:52] <omer_mor> so cmp 0xffff,1 shouldn't set cf. unless i'm missing someting
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[21:56] <snover> let me look again& this reference I used might be garbage
[21:56] <snover> i find http://carlosrafaelgn.com.br/Asm86/ to be useful in these kinds of scenarios
[22:02] <omer_mor> i didn't manage to make this site work
[22:02] <omer_mor> event with it's own example
[22:02] <snover> so i guess there is some sign extension going on
[22:02] <snover> that makes this effectively a check to see if arg_0 is 0, as you said
[22:03] <snover> if it were CMP arg_0, 5 then CF would be set for anything less than 5
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[22:03] <omer_mor> you mean between 0 - 4
[22:04] <snover> yes
[22:04] <omer_mor> so compiler generates this weird assembly for this simple check?
[22:05] <omer_mor> what*
[22:05] <snover> so in this case it is `word_seg4F4_706 = arg_0 == 1`
[22:05] <snover> i believe
[22:05] <omer_mor> you mean `word_seg4F4_706 = arg_0 == 0` ?
[22:07] <snover> no, if arg_0 is 0 then CF is 1 and AX is 0. if arg_0 is 1 then CF is 0 and AX is 1
[22:07] <omer_mor> right. maybe `word_seg4F4_706 = arg_0 != 0` ?
[22:08] <snover> yeah
[22:09] <snover> i seem to be a little rustier than i thought :)
[22:09] <omer_mor> =)
[22:09] <omer_mor> tnx
[22:09] <omer_mor> so any idea what convoluted compiler will generate this?
[22:10] <snover> not me!
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[23:39] <snover> phew. ok. back now.
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[00:00] --- Mon Jun 13 2016