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issue-0028: ?Protocol = null sentinel-shaped optional protocols

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Protocol structs registered via registerProtocolDecl carry a new
is_protocol flag; the ?T paths in sizeOf/typeSizeBytes/toLLVMType
recognise it and lay out ?Protocol as the protocol struct itself
(ctx == null IS the "none" state), matching how ?Closure / ?*T are
sentinel-shaped — no extra storage.

Method dispatch on ?Protocol auto-unwraps in lowerCall's field-access
path; the unwrap is structurally a no-op so we just rebind obj_ty to
the payload type. resolveCallParamTypes extended for optional-protocol
receivers so enum-literal args (gpu.create_texture(.r8, ...)) get the
right target_type and don't silently collapse to tag=0 : s32 — same
issue-0031-class bug closed in Session 66, one type-system layer
deeper.

Library: UIRenderer / UIPipeline / GlyphCache migrated from the verbose
gpu: GPU = ---; has_gpu: bool pattern to gpu: ?GPU = null. set_gpu no
longer maintains a parallel bool flag.

Bundled: dock.sx threads delta_time as a struct field rather than via
a global pointer (cleanup unrelated to issue-0028, committed alongside).

Verified: 85/85 regression tests pass; iOS-sim chess + macOS chess
both render correctly post-migration.
This commit is contained in:
agra
2026-05-18 18:32:55 +03:00
parent f9ecf9d00e
commit 79419b99bd
11 changed files with 117 additions and 93 deletions
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20
library/modules/ui/pipeline.sx
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@@ -25,21 +25,17 @@ UIPipeline :: struct {
has_body: bool;
parent_allocator: Allocator;
// GPU protocol backend. When `has_gpu`, the pipeline propagates this
// to its renderer + font, and skips the per-frame GL state setup in
// GPU protocol backend. When set, the pipeline propagates this to its
// renderer + font, and skips the per-frame GL state setup in
// commit_gpu (Metal bakes blend mode into the pipeline state).
gpu: GPU = ---;
has_gpu: bool = false;
gpu: ?GPU = null;
// Set the GPU dispatch BEFORE calling init() / init_font() so the
// shaders + atlas land on the right backend.
set_gpu :: (self: *UIPipeline, gpu: GPU) {
self.gpu = gpu;
self.has_gpu = true;
self.renderer.gpu = gpu;
self.renderer.has_gpu = true;
self.font.gpu = gpu;
self.font.has_gpu = true;
self.gpu = xx gpu;
self.renderer.gpu = xx gpu;
self.font.gpu = xx gpu;
}
init :: (self: *UIPipeline, width: f32, height: f32) {
@@ -167,7 +163,7 @@ UIPipeline :: struct {
}
commit_gpu :: (self: *UIPipeline) {
if !self.has_gpu {
if self.gpu == null {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_DEPTH_TEST);
@@ -182,7 +178,7 @@ UIPipeline :: struct {
self.font.upload_atlas_to_gpu();
self.renderer.flush();
if !self.has_gpu {
if self.gpu == null {
glDisable(GL_BLEND);
}
}