implements PLN-0021

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

@@ -251,7 +251,7 @@ impl FrameComposer {
             return;
         }
 
-        gfx.render_all();
+        gfx.render_no_scene_frame();
     }
 
     fn build_scene_runtime(

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

@@ -209,8 +209,8 @@ impl GfxBridge for Gfx {
     fn present(&mut self) {
         self.present()
     }
-    fn render_all(&mut self) {
+    fn render_no_scene_frame(&mut self) {
-        self.render_all()
+        self.render_no_scene_frame()
     }
     fn render_scene_from_cache(&mut self, cache: &SceneViewportCache, update: &ResolverUpdate) {
         self.render_scene_from_cache(cache, update)
@@ -552,7 +552,7 @@ impl Gfx {
     /// This method composes the final frame by rasterizing layers and sprites in the
     /// correct priority order into the back buffer.
     /// Follows the hardware model where layers and sprites are composed every frame.
-    pub fn render_all(&mut self) {
+    pub fn render_no_scene_frame(&mut self) {
         self.populate_layer_buckets();
         for bucket in &self.layer_buckets {
             Self::draw_bucket_on_buffer(

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

@@ -9,6 +9,7 @@ use crate::memory_banks::{
 use crate::pad::Pad;
 use crate::touch::Touch;
 use prometeu_hal::cartridge::AssetsPayloadSource;
+use prometeu_hal::sprite::Sprite;
 use prometeu_hal::{AssetBridge, AudioBridge, GfxBridge, HardwareBridge, PadBridge, TouchBridge};
 use std::sync::Arc;
 
@@ -46,6 +47,18 @@ impl Default for Hardware {
 }
 
 impl HardwareBridge for Hardware {
+    fn begin_frame(&mut self) {
+        self.frame_composer.begin_frame();
+    }
+
+    fn emit_sprite(&mut self, sprite: Sprite) {
+        let _ = self.frame_composer.emit_sprite(sprite);
+    }
+
+    fn render_frame(&mut self) {
+        self.frame_composer.render_frame(&mut self.gfx);
+    }
+
     fn gfx(&self) -> &dyn GfxBridge {
         &self.gfx
     }

crates/console/prometeu-hal/src/gfx_bridge.rs

@@ -48,7 +48,7 @@ pub trait GfxBridge {
     fn draw_horizontal_line(&mut self, x0: i32, x1: i32, y: i32, color: Color);
     fn draw_vertical_line(&mut self, x: i32, y0: i32, y1: i32, color: Color);
     fn present(&mut self);
-    fn render_all(&mut self);
+    fn render_no_scene_frame(&mut self);
     fn render_scene_from_cache(&mut self, cache: &SceneViewportCache, update: &ResolverUpdate);
     fn load_frame_sprites(&mut self, sprites: &[Sprite]);
     fn draw_text(&mut self, x: i32, y: i32, text: &str, color: Color);

crates/console/prometeu-hal/src/hardware_bridge.rs

@@ -2,9 +2,14 @@ use crate::asset_bridge::AssetBridge;
 use crate::audio_bridge::AudioBridge;
 use crate::gfx_bridge::GfxBridge;
 use crate::pad_bridge::PadBridge;
+use crate::sprite::Sprite;
 use crate::touch_bridge::TouchBridge;
 
 pub trait HardwareBridge {
+    fn begin_frame(&mut self);
+    fn emit_sprite(&mut self, sprite: Sprite);
+    fn render_frame(&mut self);
+
     fn gfx(&self) -> &dyn GfxBridge;
     fn gfx_mut(&mut self) -> &mut dyn GfxBridge;
 

crates/console/prometeu-system/src/virtual_machine_runtime/dispatch.rs

@@ -162,17 +162,19 @@ impl NativeInterface for VirtualMachineRuntime {
                     return Ok(());
                 }
 
-                *hw.gfx_mut().sprite_mut(index) = Sprite {
+                if active {
+                    hw.emit_sprite(Sprite {
                         glyph: Glyph { glyph_id, palette_id },
                         x,
                         y,
                         layer: 0,
                         bank_id,
-                    active,
+                        active: false,
                         flip_x,
                         flip_y,
                         priority,
-                };
+                    });
+                }
                 ret.push_int(GfxOpStatus::Ok as i64);
                 Ok(())
             }

crates/console/prometeu-system/src/virtual_machine_runtime/tests.rs

@@ -5,6 +5,7 @@ use prometeu_bytecode::Value;
 use prometeu_bytecode::assembler::assemble;
 use prometeu_bytecode::model::{BytecodeModule, ConstantPoolEntry, FunctionMeta, SyscallDecl};
 use prometeu_drivers::hardware::Hardware;
+use prometeu_drivers::{GlyphBankPoolInstaller, MemoryBanks, SceneBankPoolInstaller};
 use prometeu_hal::AudioOpStatus;
 use prometeu_hal::GfxOpStatus;
 use prometeu_hal::InputSignals;
@@ -12,10 +13,17 @@ use prometeu_hal::asset::{
     AssetCodec, AssetEntry, AssetLoadError, AssetOpStatus, BankType, LoadStatus,
 };
 use prometeu_hal::cartridge::{AssetsPayloadSource, Cartridge};
-use prometeu_hal::glyph_bank::GLYPH_BANK_PALETTE_COUNT_V1;
+use prometeu_hal::color::Color;
+use prometeu_hal::glyph::Glyph;
+use prometeu_hal::glyph_bank::{GLYPH_BANK_PALETTE_COUNT_V1, GlyphBank, TileSize};
+use prometeu_hal::scene_bank::SceneBank;
+use prometeu_hal::scene_layer::{ParallaxFactor, SceneLayer};
 use prometeu_hal::syscalls::caps;
+use prometeu_hal::tile::Tile;
+use prometeu_hal::tilemap::TileMap;
 use prometeu_vm::VmInitError;
 use std::collections::HashMap;
+use std::sync::Arc;
 use std::sync::atomic::Ordering;
 
 #[derive(Default)]
@@ -129,6 +137,40 @@ fn test_glyph_asset_data() -> Vec<u8> {
     data
 }
 
+fn runtime_test_glyph_bank(tile_size: TileSize, palette_id: u8, color: Color) -> GlyphBank {
+    let size = tile_size as usize;
+    let mut bank = GlyphBank::new(tile_size, size, size);
+    bank.palettes[palette_id as usize][1] = color;
+    for pixel in &mut bank.pixel_indices {
+        *pixel = 1;
+    }
+    bank
+}
+
+fn runtime_test_scene(glyph_bank_id: u8, palette_id: u8, tile_size: TileSize) -> SceneBank {
+    let layer = SceneLayer {
+        active: true,
+        glyph_bank_id,
+        tile_size,
+        parallax_factor: ParallaxFactor { x: 1.0, y: 1.0 },
+        tilemap: TileMap {
+            width: 2,
+            height: 2,
+            tiles: vec![
+                Tile {
+                    active: true,
+                    glyph: Glyph { glyph_id: 0, palette_id },
+                    flip_x: false,
+                    flip_y: false,
+                };
+                4
+            ],
+        },
+    };
+
+    SceneBank { layers: std::array::from_fn(|_| layer.clone()) }
+}
+
 #[test]
 fn initialize_vm_applies_cartridge_capabilities_before_loader_resolution() {
     let mut runtime = VirtualMachineRuntime::new(None);
@@ -233,6 +275,29 @@ fn tick_returns_panic_report_distinct_from_trap() {
     assert!(matches!(runtime.last_crash_report, Some(CrashReport::VmPanic { .. })));
 }
 
+#[test]
+fn tick_renders_bound_eight_pixel_scene_through_frame_composer_path() {
+    let mut runtime = VirtualMachineRuntime::new(None);
+    let mut vm = VirtualMachine::default();
+    let signals = InputSignals::default();
+    let program =
+        serialized_single_function_module(assemble("FRAME_SYNC\nHALT").expect("assemble"), vec![]);
+    let cartridge = cartridge_with_program(program, caps::NONE);
+
+    let banks = Arc::new(MemoryBanks::new());
+    banks.install_glyph_bank(0, Arc::new(runtime_test_glyph_bank(TileSize::Size8, 2, Color::BLUE)));
+    banks.install_scene_bank(0, Arc::new(runtime_test_scene(0, 2, TileSize::Size8)));
+    let mut hardware = Hardware::new_with_memory_banks(Arc::clone(&banks));
+    assert!(hardware.frame_composer.bind_scene(0));
+
+    runtime.initialize_vm(&mut vm, &cartridge).expect("runtime must initialize");
+    let report = runtime.tick(&mut vm, &signals, &mut hardware);
+
+    assert!(report.is_none(), "frame render path must not crash");
+    hardware.gfx.present();
+    assert_eq!(hardware.gfx.front_buffer()[0], Color::BLUE.raw());
+}
+
 #[test]
 fn initialize_vm_success_clears_previous_crash_report() {
     let mut runtime = VirtualMachineRuntime::new(None);

crates/console/prometeu-system/src/virtual_machine_runtime/tick.rs

@@ -145,7 +145,7 @@ impl VirtualMachineRuntime {
                     if run.reason == LogicalFrameEndingReason::FrameSync
                         || run.reason == LogicalFrameEndingReason::EndOfRom
                     {
-                        hw.gfx_mut().render_all();
+                        hw.render_frame();
 
                         // 1. Snapshot full telemetry at logical frame end
                         let (glyph_bank, sound_bank) = Self::bank_telemetry_summary(hw);
@@ -250,6 +250,7 @@ impl VirtualMachineRuntime {
         _signals: &InputSignals,
         hw: &mut dyn HardwareBridge,
     ) {
+        hw.begin_frame();
         hw.audio_mut().clear_commands();
         self.logs_written_this_frame.clear();
     }