Avoid running biome generator on client in singleplayer

src/main/java/com/gtnewhorizons/angelica/mixins/Mixins.java

@@ -76,6 +76,8 @@ public enum Mixins {
         .setPhase(Phase.EARLY).setApplyIf(() -> AngelicaConfig.enableSodium).addMixinClasses(
             "sodium.MixinChunkProviderClient"
             ,"sodium.MixinBlock"
+            ,"sodium.MixinChunk"
+            ,"sodium.MixinChunkProviderServer"
             ,"sodium.MixinEntity"
             ,"sodium.MixinRenderManager"
             ,"sodium.MixinExtendedBlockStorage"

src/main/java/com/gtnewhorizons/angelica/mixins/early/sodium/MixinChunk.java

@@ -0,0 +1,45 @@
+package com.gtnewhorizons.angelica.mixins.early.sodium;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.world.World;
+import net.minecraft.world.biome.BiomeGenBase;
+import net.minecraft.world.biome.WorldChunkManager;
+import net.minecraft.world.chunk.Chunk;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(Chunk.class)
+public abstract class MixinChunk {
+    @Shadow
+    public World worldObj;
+
+    @Shadow
+    private byte[] blockBiomeArray;
+
+    @Shadow
+    @Final
+    public int xPosition, zPosition;
+
+    @Inject(method = "fillChunk", at = @At("RETURN"))
+    private void sodium$populateBiomes(CallbackInfo ci) {
+        if(this.worldObj.isRemote && !Minecraft.getMinecraft().isSingleplayer()) {
+            // We are in multiplayer, the server might not have sent all biomes to the client.
+            // Populate them now while we're on the main thread.
+            WorldChunkManager manager =  this.worldObj.getWorldChunkManager();
+            for(int z = 0; z < 16; z++) {
+                for(int x = 0; x < 16; x++) {
+                    int idx = (z << 4) + x;
+                    int biome = this.blockBiomeArray[idx] & 255;
+                    if(biome == 255) {
+                        BiomeGenBase generated = manager.getBiomeGenAt((this.xPosition << 4) + x, (this.zPosition << 4) + z);
+                        this.blockBiomeArray[idx] = (byte)(generated.biomeID & 255);
+                    }
+                }
+            }
+        }
+    }
+}

src/main/java/com/gtnewhorizons/angelica/mixins/early/sodium/MixinChunkProviderServer.java

@@ -0,0 +1,26 @@
+package com.gtnewhorizons.angelica.mixins.early.sodium;
+
+import net.minecraft.world.biome.WorldChunkManager;
+import net.minecraft.world.chunk.Chunk;
+import net.minecraft.world.chunk.IChunkProvider;
+import net.minecraft.world.gen.ChunkProviderServer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(ChunkProviderServer.class)
+public class MixinChunkProviderServer {
+    @Redirect(method = "originalLoadChunk", at = @At(value = "INVOKE", target = "Lnet/minecraft/world/chunk/IChunkProvider;provideChunk(II)Lnet/minecraft/world/chunk/Chunk;", remap = true), remap = false)
+    private Chunk sodium$populateChunkWithBiomes(IChunkProvider instance, int chunkX, int chunkZ) {
+        Chunk chunk = instance.provideChunk(chunkX, chunkZ);
+        if(chunk != null) {
+            WorldChunkManager manager = chunk.worldObj.getWorldChunkManager();
+            for(int z = 0; z < 16; z++) {
+                for(int x = 0; x < 16; x++) {
+                    chunk.getBiomeGenForWorldCoords(x, z, manager);
+                }
+            }
+        }
+        return chunk;
+    }
+}