Instead of opening... and... closing... files... after... every...
file... operation... (which can be slow, especially if a virus scanner
is running), we catch attempts to open the same file twice and
only open one copy of the file.
On the first boot of Pokemon Snap it copies a 144KB file to the Wii's
NAND, but it only copies 32 bytes per IPC write call.
This was causing dolphin to open and close the same file over 4000
times. This wouldn't usually be a huge issue, except some operating
systems (namely Windows) allow 3rd party programs (namely antivirus
software) to hook all accesses to the filesystem.
This causes the antivirus software to scan the same file for viruses
4000+ times, which is kind of slow.
This fix reduces the initial boot time of pokemon snap from 3+ min
to just a few seconds. Could also improve other games which write
things to NAND.
Will break a few things, see the next commit for an improved fix.
- Change the Wiimote emulation SYSCONF R/W to use the temporary NAND if in use.
- Fix up SysConf API so this actually works.
Kind of a hack. Like I said, this can be cleaned up when configuration
is synced...
Eventually, netplay will be able to use the host's NAND, but this could
still be useful in some cases; for TAS it definitely makes sense to have
a way to avoid using any preexisting NAND.
In terms of implementation: remove D_WIIUSER_IDX, which was just WIIROOT
+ "/", as well as some other indices which are pointless to have as
separate variables rather than just using the actual path (fixed, since
they're actual Wii NAND paths) at the call site. Then split off
D_SESSION_WIIROOT_IDX, which can point to the dummy NAND directory, from
D_WIIROOT_IDX, which always points to the "real" one the user
configured.
Specifically, things like GETHOSTBYNAME, GETHOSTID, etc. could be done
without creating a socket, which is what the old check blocked. Now we
check at the ioctl and ioctlv handlers. Might be possible to get a bit
more realistic behavior in future by filtering individual ioctls, but it
probably doesn't matter.
This includes net, which is nonsensical to "sync" in netplay/replays
(could have the host do the Wii networking in future though...), and USB
keyboard, which just needs some love to do the same.
- FileSearch is now just one function, and it converts the original glob
into a regex on all platforms rather than relying on native Windows
pattern matching on there and a complete hack elsewhere. It now
supports recursion out of the box rather than manually expanding
into a full list of directories in multiple call sites.
- This adds a GCC >= 4.9 dependency due to older versions having
outright broken <regex>. MSVC is fine with it.
- ScanDirectoryTree returns the parent entry rather than filling parts
of it in via reference. The count is now stored in the entry like it
was for subdirectories.
- .glsl file search is now done with DoFileSearch.
- IOCTLV_READ_DIR now uses ScanDirectoryTree directly and sorts the
results after replacements for better determinism.
Replaces them with forward declarations of used types, or removes them entirely if they aren't used at all. This also replaces certain Common headers with less inclusive ones (in terms of definitions they pull in).
Lioncash