agra
9fbc24a602
ffi uikit cleanup: helpers → UIKitPlatform methods + declarative layerClass
...
Three threads, one commit because they're entangled:
1. Helper free functions on `*UIKitPlatform` (refresh_safe_insets,
read_screen_scale, create_gl_context, setup_renderbuffer,
present_renderbuffer, compute_layer_pixel_size) → methods on the
`impl Platform for UIKitPlatform` block. IMP-shape trampolines
(`uikit_keyboard_will_change_frame`, `uikit_scene_will_connect[_ios]`,
`uikit_gl_view_tick/layout/touches_*`, `uikit_subscribe_keyboard_notifications`)
also collapse into methods on UIKitPlatform — the
`(self: *void, _cmd: *void, ...)` form is no longer needed since
M3 made the #objc_class trampolines compiler-synthesized. Class
method bodies in SxAppDelegate / SxSceneDelegate / SxGLView /
SxMetalView now read `if g_uikit_plat == null { return; }
g_uikit_plat.x();` — no more `xx self, xx 0` casts at every IMP
call site.
2. Declarative `layerClass` form. SxGLView and SxMetalView promote
from the M2.1(a) constant-with-runtime-string-lookup workaround
(`layerClass :: *void = objc_getClass("CAEAGLLayer".ptr);`) to
the class-method expression-body form
(`layerClass :: () => CAEAGLLayer.class();`). Type stays `*void`
until M1.1.b lands `Class(T)` parameterisation; the value side
already matches the plan. Backing this: foreign-class declarations
for CAEAGLLayer (extended with `class :: () -> *void;`) and a new
CAMetalLayer foreign-class declaration alongside it. Both
`#extends CALayer` so the dispatch chain knows about the parent.
3. Optional-shape idiom pass on uikit.sx. `xx`-as-optional-wrap on
field assignments (`plat.gl_ctx = xx ctx`, `plat.text_field = xx tf`,
`plat.display_link = xx link`) dropped — implicit `T → ?T` does
the right thing. `!` force-unwraps replaced with `if val := opt
{ ... }` safe-narrowing (the keyboard handler, the GL-context
read in setup/present renderbuffer, the gl_view read in scene
bootstrap). `orelse` (Zig keyword) that briefly snuck into the
keyboard handler removed in favour of the `if win := plat.window`
narrowing pattern. Result: no `xx` casts left on the implicit
T→?T path; all optional access goes through `if val :=`.
IR snapshots `ffi-objc-call-06-sret-return.ir` and
`ffi-objc-dsl-07-mangling-table.ir` refresh to pick up the new
`object_getIvar` / `object_setIvar` runtime-helper declarations
introduced when M1.2 A.3 made instance-method bodies route field
access through the state ivar.
Chess on iOS-sim green throughout. 184/184 example tests pass.
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..
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