implemented tile cache and raised performance

crates/core/src/machine.rs

@@ -8,6 +8,7 @@ pub struct Machine {
     pub pad: Pad,
     pub touch: Touch,
     pub frame_index: u64,
+    pub last_frame_cpu_time_us: u64,
 }
 
 impl Machine {
@@ -20,16 +21,19 @@ impl Machine {
             pad: Pad::default(),
             touch: Touch::default(),
             frame_index: 0,
+            last_frame_cpu_time_us: 0,
         }
     }
 
     /// "Contrato de frame" do PROMETEU (Template Method sem loop).
     /// O Host controla tempo/event loop; o Core define a sequência do frame.
     pub fn step_frame(&mut self, signals: &InputSignals) {
+        let start = std::time::Instant::now();
         self.begin_frame(signals);
         self.tick();       // futuro: executa cartucho/VM
         self.gfx.render_all(); // A máquina executa o pipeline gráfico (Ação física)
         self.end_frame();  // present/housekeeping
+        self.last_frame_cpu_time_us = start.elapsed().as_micros() as u64; // Calcula quanto tempo a "CPU simulada" trabalhou de verdade
     }
 
     /// Início do frame: zera flags transitórias.

crates/core/src/peripherals/gfx.rs

@@ -124,8 +124,24 @@ impl Gfx {
     /// Pipeline principal de renderização do frame.
     /// Segue a ordem de prioridade do manual (Capítulo 4.11).
     pub fn render_all(&mut self) {
+        // 0. Fase de Preparação: Organiza quem deve ser desenhado em cada camada
+        // Criamos listas de índices para evitar percorrer os 512 sprites 5 vezes
+        let mut priority_buckets: [Vec<usize>; 5] = [
+            Vec::with_capacity(128),
+            Vec::with_capacity(128),
+            Vec::with_capacity(128),
+            Vec::with_capacity(128),
+            Vec::with_capacity(128),
+        ];
+
+        for (idx, sprite) in self.sprites.iter().enumerate() {
+            if sprite.active && sprite.priority < 5 {
+                priority_buckets[sprite.priority as usize].push(idx);
+            }
+        }
+
         // 1. Sprites de prioridade 0 (Atrás da Layer 0 - o fundo do fundo)
-        self.render_sprites_by_priority(0);
+        self.draw_bucket(&priority_buckets[0]);
 
         for i in 0..self.layers.len() {
             // 2. Layers de jogo (0 a 3)
@@ -135,7 +151,7 @@ impl Gfx {
             // i=1 desenha sprites priority 2 (sobre layer 1)
             // i=2 desenha sprites priority 3 (sobre layer 2)
             // i=3 desenha sprites priority 4 (sobre layer 3 - à frente de tudo)
-            self.render_sprites_by_priority((i + 1) as u8);
+            self.draw_bucket(&priority_buckets[i + 1]);
         }
 
         // 4. Aplica Scene Fade (Afeta tudo desenhado até agora)
@@ -183,51 +199,72 @@ impl Gfx {
         scroll_x: i32,
         scroll_y: i32
     ) {
-        let size = bank.tile_size as usize;
+        let tile_size = bank.tile_size as usize;
 
-        for screen_y in 0..screen_h {
-            for screen_x in 0..screen_w {
-                let world_x = screen_x as i32 + scroll_x;
-                let world_y = screen_y as i32 + scroll_y;
+        // 1. Calcular quantos tiles cabem na tela (com margem de 1 para o scroll)
+        let visible_tiles_x = (screen_w / tile_size) + 1;
+        let visible_tiles_y = (screen_h / tile_size) + 1;
 
-                let tile_x = (world_x / size as i32) as usize;
-                let tile_y = (world_y / size as i32) as usize;
+        // 2. Calcular o offset inicial (onde o primeiro tile começa a ser desenhado)
+        let start_tile_x = scroll_x / tile_size as i32;
+        let start_tile_y = scroll_y / tile_size as i32;
 
-                if tile_x >= map.width || tile_y >= map.height { continue; }
+        let fine_scroll_x = scroll_x % tile_size as i32;
+        let fine_scroll_y = scroll_y % tile_size as i32;
 
-                let tile = map.tiles[tile_y * map.width + tile_x];
+        // 3. Loop por Tile (Muito mais eficiente)
+        for ty in 0..visible_tiles_y {
+            for tx in 0..visible_tiles_x {
+                let map_x = (start_tile_x + tx as i32) as usize;
+                let map_y = (start_tile_y + ty as i32) as usize;
+
+                // Skip se estiver fora dos limites do mapa
+                if map_x >= map.width || map_y >= map.height { continue; }
+
+                let tile = map.tiles[map_y * map.width + map_x];
                 if tile.id == 0 { continue; }
 
-                let local_x = (world_x % size as i32) as usize;
-                let local_y = (world_y % size as i32) as usize;
+                // 4. Desenha o bloco do tile na tela
+                let screen_tile_x = (tx as i32 * tile_size as i32) - fine_scroll_x;
+                let screen_tile_y = (ty as i32 * tile_size as i32) - fine_scroll_y;
 
-                let color = bank.get_pixel(tile.id, local_x, local_y);
-                if color == Color::COLOR_KEY { continue; }
-
-                let idx = (screen_y * screen_w) + screen_x;
-                back[idx] = color.0;
+                Self::draw_tile_pixels(back, screen_w, screen_h, screen_tile_x, screen_tile_y, tile, bank);
             }
         }
     }
 
-    fn render_sprites_by_priority(&mut self, priority: u8) {
-        for sprite in self.sprites.iter() {
-            if !sprite.active || sprite.priority != priority {
-                continue;
-            }
+    // Função auxiliar para desenhar um bloco de 8x8, 16x16 ou 32x32 pixels
+    fn draw_tile_pixels(back: &mut [u16], screen_w: usize, screen_h: usize, x: i32, y: i32, tile: crate::model::Tile, bank: &TileBank) {
+        let size = bank.tile_size as usize;
 
+        for local_y in 0..size {
+            let world_y = y + local_y as i32;
+            if world_y < 0 || world_y >= screen_h as i32 { continue; }
+
+            for local_x in 0..size {
+                let world_x = x + local_x as i32;
+                if world_x < 0 || world_x >= screen_w as i32 { continue; }
+
+                let fetch_x = if tile.flip_x { size - 1 - local_x } else { local_x };
+                let fetch_y = if tile.flip_y { size - 1 - local_y } else { local_y };
+
+                let color = bank.get_pixel(tile.id, fetch_x, fetch_y);
+                if color == Color::COLOR_KEY { continue; }
+
+                back[world_y as usize * screen_w + world_x as usize] = color.0;
+            }
+        }
+    }
+
+    fn draw_bucket(&mut self, bucket: &[usize]) {
+        for &idx in bucket {
+            let sprite = &self.sprites[idx];
             let bank = match self.banks.get(sprite.bank_id as usize) {
                 Some(Some(b)) => b,
                 _ => continue,
             };
 
-            Self::draw_sprite_pixel_by_pixel(
-                &mut self.back,
-                self.w,
-                self.h,
-                sprite,
-                bank
-            );
+            Self::draw_sprite_pixel_by_pixel(&mut self.back, self.w, self.h, sprite, bank);
         }
     }
 

crates/host_desktop/src/main.rs

@@ -213,9 +213,12 @@ impl ApplicationHandler for PrometeuApp {
                 let fps = self.frames_since_last_update as f64 / stats_elapsed.as_secs_f64();
                 let kb = self.machine.gfx.memory_usage_bytes() as f64 / 1024.0;
 
+                let frame_budget_us = 16666.0;
+                let cpu_load = (self.machine.last_frame_cpu_time_us as f64 / frame_budget_us) * 100.0;
+
                 let title = format!(
-                    "PROMETEU | GFX: {:.1} KB | FPS: {:.1} | Frame: {}",
-                    kb, fps, self.machine.frame_index
+                    "PROMETEU | GFX: {:.1} KB | FPS: {:.1} | Load: {:.1}% | Frame: {}",
+                    kb, fps, cpu_load, self.machine.frame_index
                 );
                 window.set_title(&title);
             }