Re: DOSBox-X branch

Posted on 2017-04-16, 22:37

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

I repeated the tests done earlier. This time I see no performance cost in the dosbox-x page fault handling method. It runs as fast or faster than vanilla dosbox. I also found why my builds were running slower than expected. I had activated the fpu-x86 core instead of the fpu interpreter core with …

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Re: DOSBox-X branch

Posted on 2017-04-16, 06:55

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Good idea. The branch will have some issues. I also think Windows added its CRLF to winres.rc and I deleted one of the characters for presentation. 😀

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Re: DOSBox-X branch

Posted on 2017-04-16, 06:40

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Added the code for allowing nonrecursive_page_fault=false with core=normal, but normal_loop() has code which also assigns values for dosbox_allow_nonrecursive_page_fault. I think this prevents Win9x from booting. I can bypass this issue by reverting the page fault handling code in normal_loop() to …

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Re: DOSBox-X branch

Posted on 2017-04-16, 06:29

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Could you merge it using the patch tool? It should incorporate fine except maybe the last few lines which have Windows EOL characters.

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Re: DOSBox-X branch

Posted on 2017-04-16, 06:24

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Can someone spin up a Win32 binary for me? I no longer make Win32 binaries. I do all development on Linux and I leave the Win32 code as-is in the codebase. Patch to build latest dosbox-x with mingw32: diff -rupN dosbox-x-Orig//configure.ac dosbox-x//configure.ac --- dosbox-x-Orig//configure.ac 2017 …

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Re: DOSBox-X branch

Posted on 2017-04-16, 05:18

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

I'll test that, thanks.

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Re: DOSBox-X branch

Posted on 2017-04-16, 05:06

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Would it be possible to assume that a reboot is for an OS requiring the new page fault method and add the code there, too? Also, the updated reboot code in dosbox-x is very nice and a lot of work to implement throughout.

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Re: DOSBox-X branch

Posted on 2017-04-16, 04:57

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Then this code block could be moved to that section in the SDL main loop? if (!dosbox_enable_nonrecursive_page_fault) { dosbox_enable_nonrecursive_page_fault = true; _LOG(LOG_CPU,LOG_NORMAL)("normal/prefetch core requires nonrecursive page fault handling, turning it on"); } Edit to here? } catch ( …

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Re: DOSBox-X branch

Posted on 2017-04-16, 04:51

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Is there a way to detect booting of a guest OS and then require the non-recursive page faults? If possible, this would allow DOS games to run with the old model (presumably a performance benefit).

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Re: DOSBox-X branch

Posted on 2017-04-16, 04:36

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Wonderful! Also, I recall that there is code that enables "non-recursive page faults" wherever core=normal. I'll verify whether cpu.cpp has this code. Edit: if (cpudecoder == &CPU_Core_Normal_Run || cpudecoder == &CPU_Core_Prefetch_Run) { if (!dosbox_enable_nonrecursive_page_fault) { dosbox_enable_ …

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Re: DOSBox-X branch

Posted on 2017-04-16, 03:27

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Thank you for the modified implementation of the exception handling! In testing, this had some effect on performance. But any small cost in performance is weighed against having Windows guest compatibility. Do you think it is worthwhile in having a configure option to disable the page fault handling …

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Re: DOSBox-X branch

Posted on 2017-04-16, 00:25

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

That's a brilliant idea. It also makes sense to ensure the exception stack once the event occurs.

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Re: DOSBox-X branch

Posted on 2017-04-15, 19:48

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

Tested builds from different versions of gcc (v344, 462 and 464) with dwarf2 exception handling. These reportedly handle try..catch at no cost given no exceptions occur. However, tests show a small cost that is compounded inside an inner loop. Measured a 10% penalty at low frame rates with core= …

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Re: DOSBox-X branch

Posted on 2017-04-15, 19:38

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by hail-to-the-ryzen

in DOSBox Patches

in DOSBox Patches

The latest advances and features in dosbox-x have made it very compatible with a Windows guest OS. Particularly interesting is the page fault code in the normal loop and cpu core. Tested 32-bit protected mode games with and without this code's "try..catch" block in normal_loop(). Even without the …

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Re: ZDoom CLASSIC

Posted on 2017-04-14, 06:01

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by hail-to-the-ryzen

in Release Announcements

in Release Announcements

The Doom megawad "Ancient Aliens" was released in 2016: https://www.doomworld.com/idgames/levels/doom2/Ports/megawads/aaliens It is compatible with the latest zdoom. However, it shows MAPINFO load errors with older versions of zdoom. Attached an alternate MAPINFO file so the megawad loads in ZDoom- …

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Re: Thimbleweed Park (SCUMM)

Posted on 2017-03-31, 00:55

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by hail-to-the-ryzen

in Release Announcements

in Release Announcements

leileilol wrote: ......unless someone makes a DOS ScummVM port already. Probably this is one path since it is already connected to the retroarch system which has the beginnings of a DOS backend: https://github.com/libretro/scummvm.

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Re: ZDoom CLASSIC

Posted on 2017-03-28, 05:42

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by hail-to-the-ryzen

in Release Announcements

in Release Announcements

The Doom megawad "Back to Saturn X E1: Get Out Of My Stations" (BTSX EP1 v111) was released on March 2nd: https://www.doomworld.com/forum/topic/62529-back-to-saturn-x-e1-111-released-with-bugfixes-argh/ https://www.doomworld.com/idgames/levels/doom2/megawads/btsx_e1 It is reported as compatible with …

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Threaded versus switch based interpreter core

Posted on 2017-03-26, 00:59

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by hail-to-the-ryzen

in DOSBox Development

in DOSBox Development

Using computed gotos instead of switch...case in gcc4 is reported to increase performance, although the result depends on the gcc version: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39284 Information on the computed goto method: http://stackoverflow.com/questions/3848343/decode-and-dispatch- …

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Re: eDuke32 for Win95

Posted on 2017-03-10, 07:41

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by hail-to-the-ryzen

in Release Announcements

in Release Announcements

Attached updated binaries and patch for increased compatibility with Windows 95. User accepts sole responsibility for use of these binaries.

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Re: eDuke32 for Win95

Posted on 2017-03-09, 06:52

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by hail-to-the-ryzen

in Release Announcements

in Release Announcements

Attached updated binaries with camera bug fix as described on duke4 forum. Also, there is an alternate Starship Troopers TC package which is customized for eduke32: http://www.moddb.com/mods/starship-troopers-tc/downloads/sst

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