implements PLN-0088

crates/console/prometeu-drivers/src/lib.rs

@@ -12,7 +12,7 @@ pub use crate::audio::{Audio, AudioCommand, Channel, MAX_CHANNELS, OUTPUT_SAMPLE
 pub use crate::frame_composer::{ComposerBuffer, FrameComposer, SceneStatus, SpriteController};
 pub use crate::gfx::Gfx;
 pub use crate::memory_banks::{
-    GlyphBankPoolAccess, GlyphBankPoolInstaller, MemoryBanks, SceneBankPoolAccess,
+    GlyphBankPoolAccess, GlyphBankPoolInstaller, MemoryBanks, RenderResourceAccess,
-    SceneBankPoolInstaller, SoundBankPoolAccess, SoundBankPoolInstaller,
+    SceneBankPoolAccess, SceneBankPoolInstaller, SoundBankPoolAccess, SoundBankPoolInstaller,
 };
 pub use crate::pad::Pad;

crates/console/prometeu-drivers/src/memory_banks.rs

@@ -1,3 +1,11 @@
+//! Memory bank access boundary.
+//!
+//! Render consumers must cross this boundary through small, read-only traits.
+//! Frame packets carry resource IDs; large resident resources stay in banks and
+//! are returned as `Arc` snapshots of the slot contents. Installation and slot
+//! replacement remain separate owner-side operations and are not part of the
+//! render read surface.
+
 use prometeu_hal::glyph_bank::GlyphBank;
 use prometeu_hal::scene_bank::SceneBank;
 use prometeu_hal::sound_bank::SoundBank;
@@ -45,6 +53,15 @@ pub trait SceneBankPoolInstaller: Send + Sync {
     fn install_scene_bank(&self, slot: usize, bank: Arc<SceneBank>);
 }
 
+/// Read-only resource surface needed by render consumers.
+///
+/// This is intentionally narrower than `MemoryBanks`: render code can resolve
+/// stable packet IDs to resident glyph/scene banks, but cannot install or swap
+/// resources through this trait.
+pub trait RenderResourceAccess: GlyphBankPoolAccess + SceneBankPoolAccess {}
+
+impl<T> RenderResourceAccess for T where T: GlyphBankPoolAccess + SceneBankPoolAccess {}
+
 /// Centralized container for all hardware memory banks.
 ///
 /// MemoryBanks represent the actual hardware slot state.
@@ -132,3 +149,68 @@ impl SceneBankPoolInstaller for MemoryBanks {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use prometeu_hal::color::Color;
+    use prometeu_hal::glyph::Glyph;
+    use prometeu_hal::glyph_bank::TileSize;
+    use prometeu_hal::scene_layer::{ParallaxFactor, SceneLayer};
+    use prometeu_hal::tile::Tile;
+    use prometeu_hal::tilemap::TileMap;
+
+    fn assert_send_sync<T: Send + Sync>() {}
+
+    fn make_glyph_bank() -> GlyphBank {
+        let mut bank = GlyphBank::new(TileSize::Size8, 8, 8);
+        bank.palettes[0][1] = Color::WHITE;
+        bank
+    }
+
+    fn make_scene_bank() -> SceneBank {
+        let layer = SceneLayer {
+            active: true,
+            glyph_asset_id: 0,
+            tile_size: TileSize::Size8,
+            parallax_factor: ParallaxFactor { x: 1.0, y: 1.0 },
+            tilemap: TileMap {
+                width: 1,
+                height: 1,
+                tiles: vec![Tile {
+                    active: true,
+                    glyph: Glyph { glyph_id: 0, palette_id: 0 },
+                    flip_x: false,
+                    flip_y: false,
+                }],
+            },
+        };
+        SceneBank { layers: std::array::from_fn(|_| layer.clone()) }
+    }
+
+    #[test]
+    fn render_resource_access_traits_are_thread_safe() {
+        assert_send_sync::<MemoryBanks>();
+        assert_send_sync::<Arc<dyn GlyphBankPoolAccess>>();
+        assert_send_sync::<Arc<dyn SceneBankPoolAccess>>();
+        assert_send_sync::<Arc<dyn RenderResourceAccess>>();
+    }
+
+    #[test]
+    fn render_resource_access_exposes_read_only_glyph_and_scene_banks() {
+        let banks = Arc::new(MemoryBanks::new());
+        banks.install_glyph_bank(0, Arc::new(make_glyph_bank()));
+        banks.install_scene_bank(1, Arc::new(make_scene_bank()));
+
+        let render_resources: Arc<dyn RenderResourceAccess> = banks;
+        let glyph_bank =
+            render_resources.glyph_bank_slot(0).expect("glyph bank slot should be readable");
+        let scene_bank =
+            render_resources.scene_bank_slot(1).expect("scene bank slot should be readable");
+
+        assert_eq!(glyph_bank.tile_size, TileSize::Size8);
+        assert_eq!(scene_bank.layers[0].tile_size, TileSize::Size8);
+        assert!(render_resources.glyph_bank_slot(15).is_none());
+        assert!(render_resources.scene_bank_slot(15).is_none());
+    }
+}

discussion/index.ndjson

@@ -1,6 +1,6 @@
 {"type":"meta","next_id":{"DSC":42,"AGD":42,"DEC":32,"PLN":98,"LSN":48,"CLSN":1}}
 {"type":"discussion","id":"DSC-0039","status":"abandoned","ticket":"render-pipeline-family-and-future-3d","title":"Render Pipeline Family and Future 3D","created_at":"2026-06-04","updated_at":"2026-06-04","tags":["gfx","renderer","runtime","architecture","pipeline"],"agendas":[{"id":"AGD-0039","file":"AGD-0039-render-pipeline-family-and-future-3d.md","status":"abandoned","created_at":"2026-06-04","updated_at":"2026-06-04","_override_reason":"User explicitly chose to close this agenda without a new decision because DSC-0038 already established enough architecture for future extension, and 3D is intentionally deferred."}],"decisions":[],"plans":[],"lessons":[],"_override_reason":"User explicitly chose to close this agenda without a new decision because DSC-0038 already established enough architecture for future extension, and 3D is intentionally deferred."}
-{"type":"discussion","id":"DSC-0040","status":"in_progress","ticket":"vm-render-parallel-execution-boundary","title":"VM and Render Parallel Execution Boundary","created_at":"2026-06-04","updated_at":"2026-06-05","tags":["runtime","renderer","vm","concurrency","architecture","perf"],"agendas":[{"id":"AGD-0040","file":"AGD-0040-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-04","updated_at":"2026-06-05"}],"decisions":[{"id":"DEC-0031","file":"DEC-0031-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-05","updated_at":"2026-06-05","ref_agenda":"AGD-0040"}],"plans":[{"id":"PLN-0087","file":"PLN-0087-fix-game2d-packet-overlay-composition.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0088","file":"PLN-0088-define-read-only-render-resource-boundary.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0089","file":"PLN-0089-introduce-render-handoff-abstraction.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0090","file":"PLN-0090-add-render-frame-pacing-contract.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0091","file":"PLN-0091-implement-appmode-render-policy-matrix.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0092","file":"PLN-0092-add-render-epoch-ownership-transitions.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0093","file":"PLN-0093-add-render-telemetry-counters-and-events.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0094","file":"PLN-0094-specify-async-render-boundary.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0095","file":"PLN-0095-prototype-local-render-worker-capability.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0096","file":"PLN-0096-define-render-shutdown-and-failure-handling.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0097","file":"PLN-0097-add-async-render-integration-test-matrix.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]}],"lessons":[]}
+{"type":"discussion","id":"DSC-0040","status":"in_progress","ticket":"vm-render-parallel-execution-boundary","title":"VM and Render Parallel Execution Boundary","created_at":"2026-06-04","updated_at":"2026-06-05","tags":["runtime","renderer","vm","concurrency","architecture","perf"],"agendas":[{"id":"AGD-0040","file":"AGD-0040-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-04","updated_at":"2026-06-05"}],"decisions":[{"id":"DEC-0031","file":"DEC-0031-vm-and-render-parallel-execution-boundary.md","status":"accepted","created_at":"2026-06-05","updated_at":"2026-06-05","ref_agenda":"AGD-0040"}],"plans":[{"id":"PLN-0087","file":"PLN-0087-fix-game2d-packet-overlay-composition.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0088","file":"PLN-0088-define-read-only-render-resource-boundary.md","status":"done","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0089","file":"PLN-0089-introduce-render-handoff-abstraction.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0090","file":"PLN-0090-add-render-frame-pacing-contract.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0091","file":"PLN-0091-implement-appmode-render-policy-matrix.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0092","file":"PLN-0092-add-render-epoch-ownership-transitions.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0093","file":"PLN-0093-add-render-telemetry-counters-and-events.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0094","file":"PLN-0094-specify-async-render-boundary.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0095","file":"PLN-0095-prototype-local-render-worker-capability.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0096","file":"PLN-0096-define-render-shutdown-and-failure-handling.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]},{"id":"PLN-0097","file":"PLN-0097-add-async-render-integration-test-matrix.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05","ref_decisions":["DEC-0031"]}],"lessons":[]}
 {"type":"discussion","id":"DSC-0041","status":"open","ticket":"foreground-stack-game-pause-shell-vm-backed","title":"Foreground Stack, Game Pause, and VM-Backed Shell Coexistence","created_at":"2026-06-05","updated_at":"2026-06-05","tags":["runtime","os","lifecycle","shell","game","vm","foreground","architecture"],"agendas":[{"id":"AGD-0041","file":"AGD-0041-foreground-stack-game-pause-shell-vm-backed.md","status":"open","created_at":"2026-06-05","updated_at":"2026-06-05"}],"decisions":[],"plans":[],"lessons":[]}
 {"type":"discussion","id":"DSC-0038","status":"done","ticket":"render-frame-packet-boundary","title":"Logical Render Pipelines and Command Packets","created_at":"2026-05-25","updated_at":"2026-06-04","tags":["gfx","renderer","runtime","frame-composer","architecture","ui","pipeline"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0047","file":"discussion/lessons/DSC-0038-render-frame-packet-boundary/LSN-0047-typed-render-submissions-preserve-domain-boundaries.md","status":"done","created_at":"2026-06-04","updated_at":"2026-06-04"}]}
 {"type":"discussion","id":"DSC-0035","status":"done","ticket":"task-owned-shell-windows","title":"Agenda - Task-Owned Shell Windows","created_at":"2026-05-15","updated_at":"2026-05-15","tags":["runtime","os","task","window-manager","shell","lifecycle"],"agendas":[],"decisions":[],"plans":[],"lessons":[{"id":"LSN-0044","file":"discussion/lessons/DSC-0035-task-owned-shell-windows/LSN-0044-task-window-liveness-belongs-to-the-task.md","status":"done","created_at":"2026-05-15","updated_at":"2026-05-15"}]}

discussion/workflow/plans/PLN-0088-define-read-only-render-resource-boundary.md

@@ -2,7 +2,7 @@
 id: PLN-0088
 ticket: vm-render-parallel-execution-boundary
 title: Define Read-Only Render Resource Boundary
-status: open
+status: done
 created: 2026-06-05
 ref_decisions: [DEC-0031]
 tags: [runtime, renderer, resources, cache, banks]