From 1006145eead1e3a734436a3aad7219a23c0e2a4f Mon Sep 17 00:00:00 2001
From: austin <austin@austinhoover.net>
Date: Sun, 19 Jan 2025 17:28:35 -0500
Subject: [PATCH] single-chunk levels from level creation menu

---
 .../net/server/protocol/TerrainProtocol.java  | 79 +++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/src/main/java/electrosphere/net/server/protocol/TerrainProtocol.java b/src/main/java/electrosphere/net/server/protocol/TerrainProtocol.java
index 7c69c235..5583d81f 100644
--- a/src/main/java/electrosphere/net/server/protocol/TerrainProtocol.java
+++ b/src/main/java/electrosphere/net/server/protocol/TerrainProtocol.java
@@ -167,6 +167,18 @@ public class TerrainProtocol implements ServerProtocolTemplate<TerrainMessage> {
 
         ServerWorldData serverWorldData = realm.getServerWorldData();
 
+        //special handling for a world of size 1
+        if(
+            serverWorldData.getWorldBoundMax().x == ServerTerrainChunk.CHUNK_DIMENSION &&
+            serverWorldData.getWorldBoundMax().y == ServerTerrainChunk.CHUNK_DIMENSION &&
+            serverWorldData.getWorldBoundMax().z == ServerTerrainChunk.CHUNK_DIMENSION
+        ){
+            TerrainProtocol.sendWorldSubChunkAsyncStridedSingleChunk(connectionHandler, worldX, worldY, worldZ, stride);
+            Globals.profiler.endCpuSample();
+            return;
+        }
+
+        //normal multi-chunk world error checking
         if(worldX + Math.pow(2,stride) * ServerTerrainChunk.CHUNK_DATA_GENERATOR_SIZE >= serverWorldData.getWorldBoundMax().x){
             throw new Error("Requested invalid position! " + worldX);
         }
@@ -226,6 +238,73 @@ public class TerrainProtocol implements ServerProtocolTemplate<TerrainMessage> {
         Globals.profiler.endCpuSample();
     }
 
+
+    /**
+     * Sends a subchunk to the client
+     * @param connectionHandler The connection handler
+     * @param worldX the world x
+     * @param worldY the world y
+     * @param worldZ the world z
+     * @param stride The stride of the data
+     */
+    static void sendWorldSubChunkAsyncStridedSingleChunk(ServerConnectionHandler connectionHandler, int worldX, int worldY, int worldZ, int stride){
+        Globals.profiler.beginAggregateCpuSample("TerrainProtocol(server).sendWorldSubChunk");
+                
+        // System.out.println("Received request for chunk " + message.getworldX() + " " + message.getworldY());
+        Realm realm = Globals.playerManager.getPlayerRealm(connectionHandler.getPlayer());
+        if(realm.getServerWorldData().getServerTerrainManager() == null){
+            return;
+        }
+
+        Consumer<ServerTerrainChunk> onLoad = (ServerTerrainChunk chunk) -> {
+            //The length along each access of the chunk data. Typically, should be at least 17.
+            //Because CHUNK_SIZE is 16, 17 adds the necessary extra value. Each chunk needs the value of the immediately following position to generate
+            //chunk data that connects seamlessly to the next chunk.
+            int xWidth = chunk.getWeights().length;
+            int yWidth = chunk.getWeights()[0].length;
+            int zWidth = chunk.getWeights()[0][0].length;
+
+            byte[] toSend = null;
+
+            if(chunk.getHomogenousValue() == ChunkData.NOT_HOMOGENOUS){
+                ByteBuffer buffer = ByteBuffer.allocate(xWidth*yWidth*zWidth*(4+4));
+                FloatBuffer floatView = buffer.asFloatBuffer();
+
+                for(int x = 0; x < xWidth; x++){
+                    for(int z = 0; z < zWidth; z++){
+                        for(int y = 0; y < yWidth; y++){
+                            floatView.put(chunk.getWeights()[x][y][z]);
+                        }
+                    }
+                }
+
+                IntBuffer intView = buffer.asIntBuffer();
+                intView.position(floatView.position());
+
+                for(int x = 0; x < xWidth; x++){
+                    for(int z = 0; z < zWidth; z++){
+                        for(int y = 0; y < yWidth; y++){
+                            intView.put(chunk.getValues()[x][y][z]);
+                        }
+                    }
+                }
+                toSend = buffer.array();
+            } else {
+                toSend = new byte[]{ 0 };
+            }
+
+
+            // System.out.println("(Server) Send terrain at " + worldX + " " + worldY + " " + worldZ);
+            LoggerInterface.loggerNetworking.DEBUG("(Server) Send terrain at " + worldX + " " + worldY + " " + worldZ);
+            connectionHandler.addMessagetoOutgoingQueue(TerrainMessage.constructSendReducedChunkDataMessage(chunk.getWorldX(), chunk.getWorldY(), chunk.getWorldZ(), stride, chunk.getHomogenousValue(), toSend));
+        };
+
+        //request chunk
+        realm.getServerWorldData().getServerTerrainManager().getChunkAsync(worldX, worldY, worldZ, stride, onLoad);
+
+        Globals.profiler.endCpuSample();
+    }
+
     /**
      * Sends a subchunk to the client
      * @param connectionHandler The connection handler