| Commit message (Collapse) | Author | Age |
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I realised that even with the extra case for a double domino
potentially using two squares in a set, I'd missed two tricks.
Firstly, if the double domino is _required_ to use two of the squares,
you can rule out any placement in which it only uses one. But I was
only ruling out those in which it used _none_.
Secondly, if you have the same number of squares as dominoes, so that
the double domino _can_ but _need not_ use two of the squares, then I
previously thought there was no deduction you could make at all. But
there is! In that situation, the double does have to use _one_ of the
squares, or else there would be only the n-1 heterogeneous dominoes to
go round the n squares. So you can still rule out placements for the
double which fail to overlap any square in the set, even if you can't
(yet) do anything about the other dominoes involved.
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Now we don't just ensure that alloc_try_hard arranged a confounder for
every domino; we also make sure that the full Basic-mode solver can't
place even a single domino with certainty.
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Now, as well as grading a puzzle by the highest difficulty it needed
during its solution, I can check _how much_ of a given puzzle is
soluble if you remove the higher difficulty levels.
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The new Hard and Extreme difficulty levels allow you to make a start
on a grid even if there is no individual domino that can be easily
placed. So it's more elegant to _enforce_ that, in the same way that
Hard-mode Slant tries to avoid the initial toeholds that Easy mode
depends on.
Hence, I've refactored the domino layout code into several alternative
versions. The new one, enabled at Hard mode and above, arranges that
every domino has more than one possible position, so that you have to
use some kind of hard deduction to even get off the ground.
While I'm at it, the old layout system has had a makeover: in the
course of its refactoring, I've arranged to iterate over the domino
values _and_ locations in random order, instead of going over the
locations in grid order. The idea is that that might eliminate a
directional bias. But more importantly, it changes the previous
meaning of random number seeds.
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I decided not to go all the way up to order-9 Extreme, because that
takes a lot of CPU to generate. People can select it by hand if they
don't mind that.
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As with several other puzzles, the harder difficulty levels turn out
to be impossible to generate at very small sizes, which I fudge by
replacing them with the hardest level actually feasible.
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This technique borrows its name from the Solo / Map deduction in which
you find a path of vertices in your graph each of which has two
possible values, such that a choice for one end vertex of the chain
forces everything along it. In Dominosa, an approximate analogue is a
path of squares each of which has only two possible domino placements
remaining, and it has the extra-useful property that it's
bidirectional - once you've identified such a path, either all the odd
domino placements along it must be right, or all the even ones. So if
you can find an inconsistency in either set, you can rule out the
whole lot and settle on the other set.
Having done that basic analysis (which turns out to be surprisingly
easy with an edsf to help), there are multiple ways you can actually
rule out one of the same-parity chains. One is if the same domino
would have to appear twice in it; another is if the set of dominoes
that the chain would place would rule out all the choices for some
completely different square. There are probably others too, but those
are the ones I've implemented.
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I happened to notice these when running dominosa --generate under Leak
Sanitiser.
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I'm about to have a need to sort an array based on auxiliary data held
in a variable that's not globally accessible, so I need a sort routine
that accepts an extra parameter and passes it through to the compare
function.
Sorting algorithm is heapsort, because it's the N log N algorithm I
can implement most reliably.
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In particular, reorganise the priorities. I think forcing chains are
the most important thing that still wants adding; the parity search
would be easy enough but I don't know how often it would actually be
_useful_; the extended set analysis would be nice but I don't know how
to make it computationally feasible.
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I've always had the vague idea that the usual set analysis deduction
goes wrong when there are two adjacent squares, because they might be
opposite ends of the same domino and mess up the count. But I just
realised that actually you can correct for that by adjusting the
required count by one: if you have four 0 squares which between them
can only be parts of 0-0, 0-1 and 0-2, then the only way this can work
is if two of them are able to be the 0-0 - but in that case, you can
still eliminate those dominoes from all placements elsewhere. So set
analysis _can_ work in that situation; you just have to compensate for
the possible double.
(This enhanced form _might_ turn out to be something that needs
promoting into a separate difficulty level, but for the moment, I'll
try leaving it in Hard and seeing if that's OK.)
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This is another thing I've been doing with my own brain for ages as a
more interesting alternative to scouring the grid for the simpler
deduction that must be there somewhere - but now the solver can
understand it too, so it can generate puzzles that _need_ it (or at
least need something beyond the simpler strategies it understands).
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This is a reasonably simple local deduction I've been using myself for
ages, and feel comfortable adding to the existing Basic difficulty
level.
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Currently, there are just two difficulty levels. 'Basic' is the same
as the old solver; 'Trivial' is the subset that guarantees the puzzle
can be solved using only the two simplest deductions of all: 'this
domino can only go in one place' and 'only one domino orientation can
fit in this square'.
The solver has also acquired a -g option, to grade the difficulty of
an input puzzle using this system.
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The new solver should be equivalent to the previous solver's
intelligence level, but it's more usefully split up into basic
data-structure maintenance and separate deduction routines that you
can omit some of. So it's a better basis to build on when adding
further deductions or dividing the existing ones into tiers.
The new solver also produces much more legible diagnostics, when the
command-line solver is run in -v mode.
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I've made the existing optional solver diagnostics appear as the
verbose output of the solver program. They're not particularly legible
at the moment, but they're better than nothing.
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If you drag an arrow on to a square which is already filled in as part
of a completed region, or whose counterpart is filled in, or whose
counterpart is actually a dot, then the game can't actually place a
double arrow. Previously, it didn't find that out until execute_move
time, at which point it was too late to prevent a no-op action from
being placed on the undo chain.
Now we do those checks in interpret_move, before generating the move
string that tries to place the double arrow in the first place. So
execute_move can now enforce by assertion that arrow-placement moves
it gets are valid.
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Fixes an assertion failure in which you move the keyboard cursor to a
peg, press Enter to indicate that you're about to jump it to
somewhere, and then instead execute an undo or redo action which
replaces the peg with a hole. Thanks to Vitaly Ostrosablin for the
report.
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I've only just found out that it has the effect of treating the argv
words not as plain filenames, but as arguments to Perl default 'open',
i.e. if they end in | then the text before that is treated as a
command. That's not what was intended!
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Thanks to Rocco Matano for reporting that in the -DCOMBINED version of
the Windows front end, switching games causes a crash because the
presets menu from the old midend is still left over in fe, and its
presence inhibits the setup code from making a new one. Now we throw
it out at the same time as we throw out the old midend itself.
Also, the condition 'if (!fe->preset_menu)' was misguided. I think the
point of that was to avoid pointlessly tearing down and rebuilding the
preset menu when we're _not_ changing game - but that's a cost too
small to worry about if it causes the slightest trouble. Now
fe->preset_menu should always be NULL at that point in the function,
so I've replaced the if with an assert.
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Moving the snaffle_colours() call earlier is fine in GTK 3, where the
potential call to frontend_default_colour doesn't depend on the window
already having been created. But it falls over in GTK 2 where it does.
Moved the non-headless-mode version of that call back to where it was
before the --screenshot change.
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I had this idea today and immediately wondered why I'd never had it
before!
To generate the puzzle screenshots used on the website and as program
icons, we run the GTK front end with the --screenshot option, which
sets up GTK, insists on connecting to an X server (or other display),
draws the state of a puzzle on a Cairo surface, writes that surface
out to a .png file, and exits.
But there's no reason we actually need the GTK setup during that
process, especially because the surface we do the drawing on is our
_own_ surface, not even one provided to us by GTK. We could just set
up a Cairo surface by itself, draw on it, and save it to a file.
Calling gtk_init is not only pointless, but actively inconvenient,
because it means the build script depends on having an X server
available for the sole purpose of making gtk_init not complain.
So now I've simplified things, by adding a 'headless' flag in
new_window and the frontend structure, which suppresses all uses of
actual GTK, leaving only the Cairo surface setup and enough supporting
stuff (like colours) to generate the puzzle image. One awkward build
dependency removed.
This means that --screenshot no longer works in GTK 2, which I don't
care about, because it only needs to run on _one_ platform.
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Another thing I spotted while trawling the whole source base was that
a couple of games had omitted 'static' on a lot of their internal
functions. Checking with nm, there turned out to be quite a few more
than I'd spotted by eye, so this should fix them all.
Also added one missing 'const', on the lookup table nbits[] in Tracks.
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I noticed this during the bool trawl: both of these games have an
array of flags indicating which grid squares are immutable starting
clues, and copy it in every call to dup_game, which is completely
unnecessary because it doesn't change during play. So now each one
lives in a reference-counted structure, as per my usual practice in
similar cases elsewhere.
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I noticed this when I temporarily enabled compilation of all the
unfinished puzzles while doing the bool trawl.
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This is the main bulk of this boolification work, but although it's
making the largest actual change, it should also be the least
disruptive to anyone interacting with this code base downstream of me,
because it doesn't modify any interface between modules: all the
inter-module APIs were updated one by one in the previous commits.
This just cleans up the code within each individual source file to use
bool in place of int where I think that makes things clearer.
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This commit removes the old #defines of TRUE and FALSE from puzzles.h,
and does a mechanical search-and-replace throughout the code to
replace them with the C99 standard lowercase spellings.
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More or less trivially: the only affected declaration is the
has_incentre flag in struct grid_face.
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latin_check now returns bool, and latin_solver_diff_set takes a bool
'extreme' flag. Should be non-disruptive.
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The only affected function here is splitpos234, which I don't think
these puzzles are even using at the moment.
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The 'decode' flag to obfuscate_bitmap and the 'wrap' flag to
move_cursor are the only ones affected here.
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This shouldn't be a disruptive change at all: findloop_run and
findloop_is_loop_edge now return bool in place of int, but client code
should automatically adjust without needing any changes.
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Now the flag passed to edsf_merge to say whether two items are the
same or opposite is a bool, and so is the flag returned via a pointer
argument from edsf_canonify.
The latter requires client code to be updated to match (otherwise
you'll get a pointer type error), so I've done that update in Loopy,
which is edsf's only current in-tree client.
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Not many changes here: the 'dotted' flag passed to print_line_dotted
is bool, and so is the printing_in_colour flag passed to
print_get_colour. Also ps_init() takes a bool.
line_dotted is also a method in the drawing API structure, but it's
not actually filled in for any non-print-oriented implementation of
that API. So only front ends that do platform-specific _printing_
should need to make a corresponding change. In-tree, for example,
windows.c needed a fix because it prints via Windows GDI, but gtk.c
didn't have to do anything, because its CLI-based printing facility
just delegates to ps.c.
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This changes parameters of midend_size and midend_print_puzzle, the
return types of midend_process_key, midend_wants_statusbar,
midend_can_format_as_text_now and midend_can_{undo,redo}, the 'bval'
field in struct config_item, and finally the return type of the
function pointer passed to midend_deserialise and identify_game.
The last of those changes requires a corresponding fix in clients of
midend_deserialise and identify_game, so in this commit I've also
updated all the in-tree front ends to match. I expect downstream front
ends will need to do the same when they merge this change.
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encode_params, validate_params and new_desc now take a bool parameter;
fetch_preset, can_format_as_text_now and timing_state all return bool;
and the data fields is_timed, wants_statusbar and can_* are all bool.
All of those were previously typed as int, but semantically boolean.
This commit changes the API declarations in puzzles.h, updates all the
games to match (including the unfinisheds), and updates the developer
docs as well.
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This is the first commit in a series which will adopt C99 bool
throughout the code base where it makes sense to do so.
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I noticed that state->common, which is shared between all the game
states in an undo chain, has a 'solved' flag in it. That's not right -
solvedness as a property of a particular state on the chain belongs in
the game_state itself, and having-at-one-point-been-solved-ness as a
persistent property of the whole chain belongs in the game_ui.
Fortunately, the game isn't actually doing it wrong:
state->common->solved is set once and then never read, so it must have
been left in from early abandoned code. Now removed.
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latin_solver_diff_set takes a boolean input parameter to indicate
whether the 'Extreme'-level variant of set elimination is permitted.
But it's commented in the header file as having a boolean _output_
parameter which it sets if it _ended up_ using that variant. Probably
the latter was how it worked in an early draft, and I changed my mind
later without changing the comment.
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In menu_save_event, we checked ctx.error to see if an errno value had
been left in it by the savefile_write callback, but if so, then we
were passing the _current_ value of errno to strerror() in place of
the saved value in ctx.error.
This may well have been benign, but I spotted it in an eyeball review
just now and thought I'd better fix it before it bit anyone.
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To begin with, the toolchain no longer lets me build for x86-32 -
apparently MacOS is now 64-bit only.
Also, the linker now gives an error about a missing libgcc_s variant
for -mmacosx-version-min=10.4, and indeed 10.5. So I've bumped the
minimum supported OS version to 10.6.
That in turn required some changes in osx.m itself, because bumping
the min OS version caused some API deprecations to show up. Luckily I
turned out to have left myself a comment some time ago telling me what
I was going to need to do about one of them :-)
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If a locked tile has an edge pointing at a barrier, or at another
locked tile without a matching edge, colour that edge red.
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In preparation for highlighting other kinds of errors.
No intended functional change.
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I've been playing this game a fair bit recently, and it's probably
time I jotted down some of the deductions I've been doing in my own
brain that the game doesn't know about. (Also I had an algorithmic
thought about the area-parity technique.)
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For cube games, the minimum for any dimension should be 2, as there is
no net of the cube that is only one row/column. The previous logic
would permit a 1x7 game (for example) that could never be solved.
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It pointed to rectangles.html, which doesn't exist, in place of
rect.html which does.
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This makes the clue numbers actually visible in the printed output,
instead of black on black.
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The read function used by midend_deserialise and friends is expected
never to perform a partial read (the main deserialisation code always
knows how many bytes it can expect to see), so it's specified to
return simply TRUE or FALSE for success/failure, rather than the
number of bytes read.
This probably wasn't breaking anything, since in the case of
deserialising from an internal memory buffer a short read could only
arise due to an outright bug constructing the buffer. But now I've
spotted it, I should fix it.
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The JS code that retrieves the save-file data from emcc.c doesn't
receive a separate length value, but instead expects the data to be in
the form of a NUL-terminated string. But emcc.c wasn't NUL-terminating
it, so the save data could come out with random cruft on the end.
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