Shaped text is cached using all the shaping parameters as well as the
text itself as a key. This makes text shaping a non-issue for imui when
the text is stable, taking my simple test from 120fps to 1000fps
(optimized build).
As I had long suspected, building large hierarchies is fiendishly
expensive (at least O(N^2)). However, this is because the hierarchies
are structured such that adding high-level nodes results in a lot of
copying due to the flattened (breadth-first) layout (which does make for
excellent breadth-first performance when working with a hierarchy).
Using tree mode allows adding new nodes to be O(1) (I guess O(N) for the
size of the sub-tree being added, but that's not supported yet) and
costs only an additional 8 bytes per node. Switching from flat mode to
tree mode is very cheap as only the additional tree-related indices need
to be fixed up (they're almost entirely ignored in flat mode). Switching
from tree to flat mode is a little more expensive as the entire tree
needs to be copied, but it seems to be an O(N) (size of the tree).
With this, building the style editor window went from about 25% to about
5% (and most of that is realloc!), with a 1.3% cost for switching from
tree mode to flat mode.
There's still a lot of work to do (supporting removal and tree inserts).
There's still the problem with unused variables when building for
windows because of vulkan debug stuff, but this fixes the important
errors. It actually still works (at least under wine).
By default, horizontal and vertical layouts expand to fill their parent
in their on-axis direction (horizontally for horizontal layouts), but
fit to their child views in their off-axis.
Flexible space views take advantage of auto-expansion, pushing sibling
views such that the grandparent view is filled on the parent view's
on-axis, and the parent view is filled by the space in the parent view's
off-axis. Flexible views currently have a background fill, allowing them
to provide background filling of the overall view with minimal overdraw
(ancestor views don't need to have any fill at all).
Removing a hierarchy from an entity can result in a large number of
component removes in the same pool, thus changing index of the lest
element of the pool. This *seems* to fix the memory corruption I've been
experiencing with the debug UI.
The biggest change was splitting up the job resources into
per-render-pass resources, allowing individual render passes to
reallocate their resources without affecting any others. After that, it
was just getting translucency and capture working after a window resize.
I had forgotten that Hash_NewTable checked the hashctx parameter, so
calling Hash_NewTable in the struct initializer meant the hasctx was
uninitialized.
This takes care of element order stability. It did need reworking the
mouse tracking code (including adding an active flag to views), but now
buttons seem to work correctly.
It looks horrible due to the lack of lighting etc, but it's good enough
for basic testing, especially of my render job design (that passed with
flying colors).
It's there for a reason :P. Fixes most of the really bad behavior after
disabling some widgets (re-layout isn't working at all, though, and
adding the widgets back again puts them in the wrong place).
Using label + key_offset in both imui_state_getkey and the call to
Hash_Find greatly simplifies the logic of using the correct key. Fixes
an ever-growing set of buttons when using separators (hmm, I think this
means pruning isn't working correctly).
TextContent seems redundant at this stage since a text view is always
sized to its content, and PercentOfParent doesn't work yet. Pixels
definitely works and Null seems to work in that it does no sizing or
positioning. Vertical layout is supported but not yet tested, similar
for ChildrenSum, but I can have two buttons side by side.
Text_StringView sets the view bounds to the bounds of the glyphs in the
view. This has its advantages, but is not suitable for automatic UI
sizing. However, the view is positioned correctly, so nothing needs to
be done there. Now full height glyphs (eg, C) look balanced in the view,
and glyphs with descenders (g) brush the bottom of the view.
It does almost nothing (just puts a non-function button on the screen),
but it will help develop the IMUI code and, of course, come to help with
debugging in general.
Both passage and simple text are supported, but only simple text has
been tested at this stage. However, as passage text was taken directly
from rua_gui.c and formed the basis for simple text rendering, I expect
it's at least close to working.
The same underlying mechanism is used for both simple text strings and
passages, but without the intervening hierarchy of paragraphs etc.
Results in only the one view for a simple text string.
I'm not sure I like fontconfig (docs are...), but it is pretty standard,
and I was able to find some reasonable examples on stackexchange
(https://stackoverflow.com/questions/10542832/how-to-use-fontconfig-to-get-font-list-c-c).
Currently, only the one font is handled, no font sets for fall backs
etc. It's meant for the debug UI I'm working on, so that shouldn't be a
big deal.
