feat: infinite terrain streaming with 3-chunk radius

src/engine/ChunkManager.ts

@@ -46,12 +46,17 @@ export default class ChunkManager {
       this.removeChunk(coord.X, coord.Z)
     }
 
-    for (const chunkRef of update.chunksToAdd ?? []) {
-      const { X: cx, Z: cz } = chunkRef.coord
-      if (this.activeChunks.some(c => c.coord.x === cx && c.coord.z === cz)) continue
-      const chunk = await this.generateChunk(cx, cz)
-      this.activeChunks.push(chunk)
-    }
+    const toGenerate = (update.chunksToAdd ?? []).filter(ref => {
+      const { X: cx, Z: cz } = ref.coord
+      return !this.activeChunks.some(c => c.coord.x === cx && c.coord.z === cz)
+    })
+
+    if (toGenerate.length === 0) return
+
+    const newChunks = await Promise.all(
+      toGenerate.map(ref => this.generateChunk(ref.coord.X, ref.coord.Z))
+    )
+    this.activeChunks.push(...newChunks)
   }
 
   private removeChunk(cx: number, cz: number): void {

src/engine/GameEngine.ts

@@ -39,8 +39,8 @@ export default class GameEngine {
     this.pointerLocked = document.pointerLockElement === canvas
   }
 
-  private lastStreamX = 0
-  private lastStreamZ = 0
+  private lastStreamX = -99999
+  private lastStreamZ = -99999
 
   constructor(device: GPUDevice, context: GPUCanvasContext, format: GPUTextureFormat) {
     this.device = device
@@ -137,7 +137,7 @@ export default class GameEngine {
     if (this.playerState) {
       const dx = this.playerState.x - this.lastStreamX
       const dz = this.playerState.z - this.lastStreamZ
-      if (dx * dx + dz * dz > 256 * 256) {
+      if (dx * dx + dz * dz > 128 * 128) {
         this.lastStreamX = this.playerState.x
         this.lastStreamZ = this.playerState.z
         this.chunkManager?.streamUpdate(this.playerState.x, this.playerState.z)

wasm/main.go

@@ -60,9 +60,7 @@ func goWorldUpdate(_ js.Value, args []js.Value) any {
 	playerZ := args[1].Float()
 	update := globalWorld.Update(playerX, playerZ)
 
-	for _, r := range update.ChunksToAdd {
-		globalHeightmaps[r.Coord] = r.Heightmap
-	}
+	// Clean up heightmap cache for evicted chunks
 	for _, c := range update.ChunksToRemove {
 		delete(globalHeightmaps, c)
 	}

wasm/world/config.go

@@ -3,9 +3,9 @@ package world
 // Constants mirror terra-major World.cs
 const (
 	InitialRenderRadius = 2048.0
-	RenderRadius        = 512.0
-	DistanceThreshold   = 1100.0
-	MaxConcurrentChunks = 3
+	RenderRadius        = 1536.0
+	DistanceThreshold   = 2560.0
+	MaxConcurrentChunks = 64
 )
 
 // ChunkCoord identifies a chunk by grid position.

wasm/world/world.go

@@ -2,6 +2,7 @@ package world
 
 import (
 	"math"
+	"sort"
 
 	"github.com/maxfelker/terrain-webgpu/wasm/terrain"
 )
@@ -51,40 +52,39 @@ func (w *World) Update(playerX, playerZ float64) WorldUpdate {
 			cx := playerChunkX + dx
 			cz := playerChunkZ + dz
 
-			worldDX := float64(cx)*chunkSize - playerX
-			worldDZ := float64(cz)*chunkSize - playerZ
-			if worldDX*worldDX+worldDZ*worldDZ > RenderRadius*RenderRadius {
+			// Use chunk center for circular distance check
+			centerDX := (float64(cx)+0.5)*chunkSize - playerX
+			centerDZ := (float64(cz)+0.5)*chunkSize - playerZ
+			if centerDX*centerDX+centerDZ*centerDZ > RenderRadius*RenderRadius {
 				continue
 			}
 
 			coord := ChunkCoord{X: cx, Z: cz}
 			if w.registry.IsActive(coord) {
 				continue
 			}
-			if !w.registry.CanDispatch() {
-				break
-			}
 
-			w.registry.MarkGenerating(coord)
-			hm := terrain.GenerateHeightmap(cx, cz, w.cfg)
-			normals := terrain.ComputeNormals(hm, w.cfg.HeightmapResolution, float64(w.cfg.Dimension), float64(w.cfg.Height))
-			w.registry.MarkReady(coord)
 			w.registry.MarkActive(coord)
-
-			toAdd = append(toAdd, ChunkGenResult{
-				Coord:     coord,
-				Heightmap: hm,
-				Normals:   normals,
-			})
+			toAdd = append(toAdd, ChunkGenResult{Coord: coord})
 		}
 	}
 
+	// Sort toAdd by distance from player (nearest first for better UX)
+	sort.Slice(toAdd, func(i, j int) bool {
+		ci, cj := toAdd[i].Coord, toAdd[j].Coord
+		di := (float64(ci.X)+0.5)*chunkSize - playerX
+		dj := (float64(cj.X)+0.5)*chunkSize - playerX
+		diz := (float64(ci.Z)+0.5)*chunkSize - playerZ
+		djz := (float64(cj.Z)+0.5)*chunkSize - playerZ
+		return di*di+diz*diz < dj*dj+djz*djz
+	})
+
 	// Evict chunks beyond distance threshold
 	toRemove := make([]ChunkCoord, 0)
 	for _, coord := range w.registry.ActiveCoords() {
-		worldDX := float64(coord.X)*chunkSize - playerX
-		worldDZ := float64(coord.Z)*chunkSize - playerZ
-		if worldDX*worldDX+worldDZ*worldDZ > DistanceThreshold*DistanceThreshold {
+		centerDX := (float64(coord.X)+0.5)*chunkSize - playerX
+		centerDZ := (float64(coord.Z)+0.5)*chunkSize - playerZ
+		if centerDX*centerDX+centerDZ*centerDZ > DistanceThreshold*DistanceThreshold {
 			w.registry.Remove(coord)
 			toRemove = append(toRemove, coord)
 		}