From 69bd39bd45d95b6918b28f8964174834156943a1 Mon Sep 17 00:00:00 2001
From: Bixilon <bixilon@bixilon.de>
Date: Mon, 15 Nov 2021 15:55:16 +0100
Subject: [PATCH] fix fast biomes

---
 doc/rendering/world_renderer.md                           | 8 +++++++-
 .../data/world/biome/accessor/NoiseBiomeAccessor.kt       | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/doc/rendering/world_renderer.md b/doc/rendering/world_renderer.md
index 07429ffb4..43e959055 100644
--- a/doc/rendering/world_renderer.md
+++ b/doc/rendering/world_renderer.md
@@ -9,7 +9,7 @@
 - 3 Meshes per section (opaque; transparent; translucent)
 - Preparing in nearer to further away order
   - unload meshes if block changed and not in frustum
-  - only prepare if chunk is in frustum
+  - only prepare if chunk is in frust
   - don't prepare empty chunks
 - Light
   - Client side light engine
@@ -40,3 +40,9 @@
   - Greedy meshing
 - Model deciding (for pre flattening versions)
 - Assets manager: Create file from jar with all models inside and load models from there (make them moddable)
+
+
+- ToDo:
+  - Unshelve
+  - Thread safety
+  - Build biome cache only in render distance
diff --git a/src/main/java/de/bixilon/minosoft/data/world/biome/accessor/NoiseBiomeAccessor.kt b/src/main/java/de/bixilon/minosoft/data/world/biome/accessor/NoiseBiomeAccessor.kt
index 18dabddb7..855edf4de 100644
--- a/src/main/java/de/bixilon/minosoft/data/world/biome/accessor/NoiseBiomeAccessor.kt
+++ b/src/main/java/de/bixilon/minosoft/data/world/biome/accessor/NoiseBiomeAccessor.kt
@@ -36,7 +36,7 @@ class NoiseBiomeAccessor(private val world: World) {
                     return null
                 }
 
-                return it.data[(biomeY / 4) * 16 + (((z and 0x0F) / 4) * 4 + ((x and 0x0F) / 4))]
+                return it.data[(biomeY and 0x0F) shr 2 and 0x3F shl 4 or ((z and 0x0F) shr 2 and 0x03 shl 2) or ((x and 0x0F) shr 2 and 0x03)]
             }
             return null
         }