Prove the input path end-to-end. Poll platform events in the frame loop
and, on a mouse_down (UIKit touchesBegan, mapped to an Event in uikit.sx),
toggle the centered quad between orange and green. The toggle marks the
vertex buffer dirty; the next frame re-uploads the active color palette
before drawing. Flip on the press only — a tap also delivers mouse_up
(touchesEnded), so toggling on both would net to no visible change.
goldens/p0_input_before.png (orange quad) and goldens/p0_input_after.png
(green quad) bracket a real tap injected at the device-screen center
(201,437 pt) via `idb ui tap` on the booted iOS 26.0 simulator.
Prove the render path end-to-end: bring up UIKit + Metal (already
scaffolded), clear to a solid blue, and draw one centered orange quad via
the GPU protocol's clear+quad path — an MSL pass-through pipeline plus a
6-vertex (2-triangle) NDC buffer, created lazily once the MTLDevice exists.
Geometry is NDC [-0.5, 0.5]² so the quad is the central 50%x50% of the
drawable regardless of device resolution, keeping the screenshot golden
unambiguous. Background (0.10, 0.20, 0.55), quad (1.0, 0.6, 0.0).
goldens/p0_quad.png is the first screenshot golden, captured from the
booted iOS 26.0 simulator after install + launch.
Stand up build.sx (macos + ios/ios-sim targets, bundle id
co.swipelab.m3te, output sx-out/ios/M3te.app, assets dir) and a minimal
main.sx that brings up the platform (UIKit+Metal on iOS, SDL3+GL on
macOS) and renders a solid-clear frame. Add assets/ and goldens/
directories and a .gitignore for build artifacts.
Modeled on game/build.sx and game/main.sx; modules resolve from the
compiler binary with no -L flag.
