feat(map): stream secondary map assets by chunk

src/world/map-instancing/MapInstancingSystem.tsx

@@ -1,4 +1,8 @@
-import { Suspense } from "react";
+import { Suspense, useCallback, useMemo, useRef, useState } from "react";
+import { useFrame, useThree } from "@react-three/fiber";
+import { CHUNK_CONFIG } from "@/data/world/fogConfig";
+import { useCameraMode } from "@/hooks/debug/useCameraMode";
+import { useSceneMode } from "@/hooks/debug/useSceneMode";
 import {
   isMapModelVisible,
   useMapPerformanceStore,
@@ -6,44 +10,174 @@ import {
 import { InstancedMapAsset } from "@/world/map-instancing/InstancedMapAsset";
 import {
   MAP_INSTANCING_ASSETS,
+  type MapInstancingAssetConfig,
   type MapInstancingAssetType,
 } from "@/world/map-instancing/mapInstancingConfig";
-import { useMapInstancingData } from "@/world/map-instancing/useMapInstancingData";
+import {
+  type MapAssetInstance,
+  useMapInstancingData,
+} from "@/world/map-instancing/useMapInstancingData";
+
+interface MapAssetChunk {
+  key: string;
+  config: MapInstancingAssetConfig;
+  centerX: number;
+  centerZ: number;
+  instances: MapAssetInstance[];
+}
+
+function getChunkKey(instance: MapAssetInstance): string {
+  const [x, , z] = instance.position;
+  const chunkX = Math.floor(x / CHUNK_CONFIG.chunkSize);
+  const chunkZ = Math.floor(z / CHUNK_CONFIG.chunkSize);
+  return `${chunkX}:${chunkZ}`;
+}
+
+function createMapAssetChunks(
+  type: MapInstancingAssetType,
+  config: MapInstancingAssetConfig,
+  instances: MapAssetInstance[],
+): MapAssetChunk[] {
+  const chunks = new Map<string, MapAssetInstance[]>();
+
+  for (const instance of instances) {
+    const key = getChunkKey(instance);
+    const chunk = chunks.get(key);
+
+    if (chunk) {
+      chunk.push(instance);
+    } else {
+      chunks.set(key, [instance]);
+    }
+  }
+
+  return [...chunks.entries()].map(([chunkKey, chunkInstances]) => {
+    const center = chunkInstances.reduce(
+      (sum, instance) => {
+        sum.x += instance.position[0];
+        sum.z += instance.position[2];
+        return sum;
+      },
+      { x: 0, z: 0 },
+    );
+
+    return {
+      key: `${type}:${chunkKey}`,
+      config,
+      centerX: center.x / chunkInstances.length,
+      centerZ: center.z / chunkInstances.length,
+      instances: chunkInstances,
+    };
+  });
+}
 
 export function MapInstancingSystem(): React.JSX.Element | null {
+  const camera = useThree((state) => state.camera);
+  const cameraMode = useCameraMode();
+  const sceneMode = useSceneMode();
   const groups = useMapPerformanceStore((state) => state.groups);
   const models = useMapPerformanceStore((state) => state.models);
   const { data, isLoading } = useMapInstancingData();
+  const lastUpdateRef = useRef(-CHUNK_CONFIG.updateInterval);
+  const [activeChunkKeys, setActiveChunkKeys] = useState<Set<string>>(
+    () => new Set(),
+  );
+  const streamingEnabled =
+    CHUNK_CONFIG.enabled && sceneMode === "game" && cameraMode === "player";
+
+  const chunks = useMemo(() => {
+    if (!data) return [];
+
+    return Object.entries(MAP_INSTANCING_ASSETS).flatMap(([type, config]) => {
+      if (
+        !config.enabled ||
+        !isMapModelVisible(config.mapName, { groups, models })
+      ) {
+        return [];
+      }
+
+      const instances = data.get(type as MapInstancingAssetType);
+      if (!instances || instances.length === 0) return [];
+
+      return createMapAssetChunks(
+        type as MapInstancingAssetType,
+        config,
+        instances,
+      );
+    });
+  }, [data, groups, models]);
+
+  const visibleChunks = streamingEnabled
+    ? chunks.filter((chunk) => {
+        if (activeChunkKeys.size > 0) {
+          return activeChunkKeys.has(chunk.key);
+        }
+
+        return (
+          Math.hypot(
+            chunk.centerX - camera.position.x,
+            chunk.centerZ - camera.position.z,
+          ) <= CHUNK_CONFIG.loadRadius
+        );
+      })
+    : chunks;
+
+  const updateActiveChunks = useCallback(() => {
+    const nextKeys = new Set<string>();
+    const cameraX = camera.position.x;
+    const cameraZ = camera.position.z;
+
+    for (const chunk of chunks) {
+      const distance = Math.hypot(
+        chunk.centerX - cameraX,
+        chunk.centerZ - cameraZ,
+      );
+      const wasActive = activeChunkKeys.has(chunk.key);
+      const radius = wasActive
+        ? CHUNK_CONFIG.unloadRadius
+        : CHUNK_CONFIG.loadRadius;
+
+      if (distance <= radius) {
+        nextKeys.add(chunk.key);
+      }
+    }
+
+    if (
+      nextKeys.size === activeChunkKeys.size &&
+      [...nextKeys].every((key) => activeChunkKeys.has(key))
+    ) {
+      return;
+    }
+
+    setActiveChunkKeys(nextKeys);
+  }, [activeChunkKeys, camera, chunks]);
+
+  useFrame(({ clock }) => {
+    if (!streamingEnabled) return;
+
+    const now = clock.elapsedTime * 1000;
+    if (now - lastUpdateRef.current < CHUNK_CONFIG.updateInterval) return;
+    lastUpdateRef.current = now;
+
+    updateActiveChunks();
+  });
 
   if (isLoading || !data) {
     return null;
   }
 
-  const enabledAssets = Object.entries(MAP_INSTANCING_ASSETS).filter(
-    ([, config]) =>
-      config.enabled && isMapModelVisible(config.mapName, { groups, models }),
-  );
-
   return (
     <group name="map-instancing-system">
-      {enabledAssets.map(([type, config]) => {
-        const instances = data.get(type as MapInstancingAssetType);
-
-        if (!instances || instances.length === 0) {
-          return null;
-        }
-
-        return (
-          <Suspense key={type} fallback={null}>
-            <InstancedMapAsset
-              modelPath={config.modelPath}
-              instances={instances}
-              castShadow={config.castShadow}
-              receiveShadow={config.receiveShadow}
-            />
-          </Suspense>
-        );
-      })}
+      {visibleChunks.map((chunk) => (
+        <Suspense key={chunk.key} fallback={null}>
+          <InstancedMapAsset
+            modelPath={chunk.config.modelPath}
+            instances={chunk.instances}
+            castShadow={chunk.config.castShadow}
+            receiveShadow={chunk.config.receiveShadow}
+          />
+        </Suspense>
+      ))}
     </group>
   );
 }

src/world/map-instancing/mapInstancingConfig.ts

@@ -41,6 +41,34 @@ export const MAP_INSTANCING_ASSETS = {
     receiveShadow: true,
     enabled: true,
   },
+  panneauaffichage: {
+    mapName: "panneauaffichage",
+    modelPath: "/models/panneauaffichage/model.gltf",
+    castShadow: true,
+    receiveShadow: true,
+    enabled: true,
+  },
+  panneauclassique: {
+    mapName: "panneauclassique",
+    modelPath: "/models/panneauclassique/model.gltf",
+    castShadow: true,
+    receiveShadow: true,
+    enabled: true,
+  },
+  panneaufleche: {
+    mapName: "panneaufleche",
+    modelPath: "/models/panneaufleche/model.gltf",
+    castShadow: true,
+    receiveShadow: true,
+    enabled: true,
+  },
+  panneausolaire: {
+    mapName: "panneausolaire",
+    modelPath: "/models/panneausolaire/model.gltf",
+    castShadow: true,
+    receiveShadow: true,
+    enabled: true,
+  },
 } as const;
 
 export type MapInstancingAssetType = keyof typeof MAP_INSTANCING_ASSETS;