iris-aiandClaude Opus 5
39e4ca20e6
`Px` and `PxVec2` reach the last places a pixel was a float: the window, the box a widget reads, the box it is compared against, and `PixelRegion`. A pointer, a wheel notch and a shaped glyph advance still arrive as floats, and each is put on the grid where it arrives. `Holds` is an interval of `Px`. `HOLDS_EPSILON_PX` is gone with the `exact`/tolerant split it existed for: `at` is the length a widget read, an open end is the next step along, and `same_px` is equality. `Span`'s margin from `5ed9e87` goes too -- the box a parent hands back and the sum of what its children asked for are counts of the same step, so the boundary decides the same way from either side. Three things had to be true for that, and were not: `Holds::through` inverts `px + rel * box`, which rounds -- so a part of a given length came from a range of boxes, and inverting the length alone gave a point that need not contain the box the part was drawn in. It now maps the half step either side, and one more for a length composed down the chain against the same length measured against the window. `RegionRemap` translates when a box only moved, rather than dividing to find each part's fraction and multiplying to place it again. Two roundings landed a step from where growing the tree that way does; a move is exact on a grid, which is the whole reason `tests/drift.rs` was written. A pixel is `1/1024` rather than `1/64`. At `1/64` the residue of a length reached two ways was one step, and one step was 0.016 px -- enough to move a box. `PX_SHIFT` and `REL_SHIFT` are the only statement of the grid now, and the shader's copy is prepended from them rather than written twice. Checked: fmt, clippy, 102 tests, 100 generated seeds in 75 s, all five shrinker cases at 300 seeds, and `tabs`, `view`, `minimal`, `text` and `random` byte-identical at 1920x1200. What the fuzzers ask for is now a step, not a twentieth of a pixel: the shrinker's five cases agree within one (`resize` exactly), and the oracle's two-operation cases within two. The residue is a single rounding either way -- it scales with the grid rather than accumulating, which is why it is a thousandth of a pixel now. Closing it means one way of asking how long a box is, rather than a chain composed down and a length measured against the window; that is a bigger change than this one. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
iris
My experimental attempt at a rust ui library (also my first ui library).
It's currently designed around using retained data structures (widgets), rather than diffing generated trees from data like xilem or iced. This is an experiment and I'm not sure if it's a good idea or not.
Examples are in examples, eg. cargo run --example tabs.
Goals, in general order:
- does what I want it to (text, images, video, animations)
- very easy to use ignoring ergonomic ref counting
- reasonably fast / efficient (a lot faster than electron, save battery life, try to beat iced and xilem)
dev details
not targeting web rn cause wanna use actual nice gpu features & entire point of this is to make desktop apps / not need a web browser
general ideas trynna use rn / experiment with:
- retained mode
- specifically designed around wgpu so there's no translation
- postfix functions for most things to prevent unreadable indentation (going very well)
- events can be done directly where you draw the widgets
- almost no macros in user code & actual LSP typechecking (variadic generics if you can hear me please save us)
- relative anchor + absolute offset coord system (+ "rest" / leftover during widget layout)
- single threaded ui & pass context around to make non async usage straightforward (pretty unsure about this)
- widgets store outside of the actual rendering so they can be moved around and swapped easily (unsure about this but seems to work good for now)
under heavy initial development so not gonna try to explain status, maybe check TODO for that; sizable chance it gets a rewrite once I know everything I need and what seems to work best
it's called iris because it's the structure around what you actually want to display and colorful