Fixed render regions actually being repeated for wrapped around chunks

src/main/kotlin/ru/dbotthepony/kstarbound/client/ClientWorld.kt

@@ -18,6 +18,7 @@ import ru.dbotthepony.kstarbound.world.api.ITileAccess
 import ru.dbotthepony.kstarbound.world.api.OffsetCellAccess
 import ru.dbotthepony.kstarbound.world.api.TileView
 import ru.dbotthepony.kstarbound.world.entities.Entity
+import ru.dbotthepony.kstarbound.world.positiveModulo
 import ru.dbotthepony.kvector.api.IStruct2i
 import ru.dbotthepony.kvector.util2d.AABB
 import ru.dbotthepony.kvector.vector.RGBAColor
@@ -47,6 +48,24 @@ class ClientWorld(
 
 	val renderRegionWidth = if (size == null) 16 else determineChunkSize(size.x)
 	val renderRegionHeight = if (size == null) 16 else determineChunkSize(size.y)
+	val renderRegionsX = if (size == null) 0 else size.x / renderRegionWidth
+	val renderRegionsY = if (size == null) 0 else size.y / renderRegionHeight
+
+	fun isValidRenderRegionX(value: Int): Boolean {
+		if (size == null || loopX) {
+			return true
+		} else {
+			return value in 0 .. renderRegionsX
+		}
+	}
+
+	fun isValidRenderRegionY(value: Int): Boolean {
+		if (size == null || loopY) {
+			return true
+		} else {
+			return value in 0 .. renderRegionsY
+		}
+	}
 
 	inner class RenderRegion(val x: Int, val y: Int) {
 		inner class Layer(private val view: ITileAccess, private val isBackground: Boolean) {
@@ -170,6 +189,14 @@ class ClientWorld(
 
 	val renderRegions = Long2ObjectOpenHashMap<RenderRegion>()
 
+	fun renderRegionKey(x: Int, y: Int): Long {
+		if (size == null) {
+			return x.toLong() shl 32 or y.toLong()
+		} else {
+			return positiveModulo(x, renderRegionsX).toLong() shl 32 or positiveModulo(y, renderRegionsY).toLong()
+		}
+	}
+
 	/**
 	 * all intersecting chunks
 	 */
@@ -180,7 +207,7 @@ class ClientWorld(
 
 		for (x in ix .. ix + CHUNK_SIZE / renderRegionWidth) {
 			for (y in iy .. iy + CHUNK_SIZE / renderRegionWidth) {
-				renderRegions[x.toLong() shl 32 or y.toLong()]?.let(action)
+				renderRegions[renderRegionKey(x, y)]?.let(action)
 			}
 		}
 	}
@@ -198,7 +225,7 @@ class ClientWorld(
 			for ((x, y) in ring) {
 				val ix = (pos.component1() + x) / renderRegionWidth
 				val iy = (pos.component2() + y) / renderRegionHeight
-				val index = ix.toLong() shl 32 or iy.toLong()
+				val index = renderRegionKey(ix, iy)
 
 				if (seen.add(index)) {
 					renderRegions[index]?.let(action)
@@ -207,7 +234,7 @@ class ClientWorld(
 		} else {
 			val ix = pos.component1() / renderRegionWidth
 			val iy = pos.component2() / renderRegionHeight
-			renderRegions[ix.toLong() shl 32 or iy.toLong()]?.let(action)
+			renderRegions[renderRegionKey(ix, iy)]?.let(action)
 		}
 	}
 
@@ -227,7 +254,8 @@ class ClientWorld(
 
 		for (x in rx .. rx + dx) {
 			for (y in ry .. ry + dy) {
-				val renderer = renderRegions.computeIfAbsent(x.toLong() shl 32 or y.toLong(), Long2ObjectFunction {
+				if (!isValidRenderRegionX(x) || !isValidRenderRegionY(y)) continue
+				val renderer = renderRegions.computeIfAbsent(renderRegionKey(x, y), Long2ObjectFunction {
 					RenderRegion((it ushr 32).toInt(), it.toInt())
 				})
 

src/main/kotlin/ru/dbotthepony/kstarbound/world/CoordinateMapper.kt

@@ -2,22 +2,22 @@ package ru.dbotthepony.kstarbound.world
 
 import ru.dbotthepony.kstarbound.math.divideUp
 
+fun positiveModulo(a: Int, b: Int): Int {
+	val result = a % b
+	return if (result < 0) result + b else result
+}
+
+fun positiveModulo(a: Double, b: Int): Double {
+	val result = a % b
+	return if (result < 0.0) result + b else result
+}
+
+fun positiveModulo(a: Float, b: Int): Float {
+	val result = a % b
+	return if (result < 0f) result + b else result
+}
+
 abstract class CoordinateMapper {
-	protected fun positiveModulo(a: Int, b: Int): Int {
-		val result = a % b
-		return if (result < 0) result + b else result
-	}
-
-	protected fun positiveModulo(a: Double, b: Int): Double {
-		val result = a % b
-		return if (result < 0.0) result + b else result
-	}
-
-	protected fun positiveModulo(a: Float, b: Int): Float {
-		val result = a % b
-		return if (result < 0f) result + b else result
-	}
-
 	abstract val chunks: Int
 
 	abstract fun cell(value: Int): Int

src/main/kotlin/ru/dbotthepony/kstarbound/world/World.kt

@@ -37,8 +37,8 @@ const val CHUNK_SIZEd = CHUNK_SIZE.toDouble()
 abstract class World<This : World<This, ChunkType>, ChunkType : Chunk<This, ChunkType>>(
 	val seed: Long,
 	val size: Vector2i?,
-	loopX: Boolean,
-	loopY: Boolean
+	val loopX: Boolean,
+	val loopY: Boolean
 ) : ICellAccess {
 	val x: CoordinateMapper = if (size == null) CoordinateMapper.Infinite else if (loopX) CoordinateMapper.Wrapper(size.x) else CoordinateMapper.Clamper(size.x)
 	val y: CoordinateMapper = if (size == null) CoordinateMapper.Infinite else if (loopY) CoordinateMapper.Wrapper(size.y) else CoordinateMapper.Clamper(size.y)