From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MrHua269 <mrhua269@gmail.com>
Date: Sat, 18 Apr 2026 12:26:25 +0800
Subject: [PATCH] Leaves: Configurable collision behavior

Co-authored by: Fortern <blueten.ki@gmail.com>
As part of: Leaves (https://github.com/LeavesMC/Leaves/blob/c5f18b7864206cea4411211b51787f10affbcb9c/leaves-server/minecraft-patches/features/0111-Configurable-collision-behavior.patch)
Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)

diff --git a/ca/spottedleaf/moonrise/patches/collisions/CollisionUtil.java b/ca/spottedleaf/moonrise/patches/collisions/CollisionUtil.java
index 8d2518600ad518999b75124f0a87db9efe541f2e..c2c4a83ac4fb787402400d490ecc94be50e49bd8 100644
--- a/ca/spottedleaf/moonrise/patches/collisions/CollisionUtil.java
+++ b/ca/spottedleaf/moonrise/patches/collisions/CollisionUtil.java
@@ -101,6 +101,14 @@ public final class CollisionUtil {
                (box1.minZ - box2.maxZ) < -COLLISION_EPSILON && (box1.maxZ - box2.minZ) > COLLISION_EPSILON;
     }
 
+    // Leaves start - Configurable collision behavior
+    public static boolean voxelShapeIntersectVanilla(final AABB box1, final AABB box2) {
+        return box1.minX < box2.maxX && box1.maxX > box2.minX &&
+               box1.minY < box2.maxY && box1.maxY > box2.minY &&
+               box1.minZ < box2.maxZ && box1.maxZ > box2.minZ;
+    }
+    // Leaves end - Configurable collision behavior
+
     // assume !isEmpty(target) && abs(source_move) >= COLLISION_EPSILON
     public static double collideX(final AABB target, final AABB source, final double source_move) {
         if ((source.minY - target.maxY) < -COLLISION_EPSILON && (source.maxY - target.minY) > COLLISION_EPSILON &&
@@ -2033,7 +2041,7 @@ public final class CollisionUtil {
                                                 continue;
                                             }
                                         } else {
-                                            if (!voxelShapeIntersect(aabb, singleAABB)) {
+                                            if (shouldSkip(aabb, blockCollision, singleAABB)) { // Leaves - Configurable collision behavior
                                                 continue;
                                             }
                                         }
@@ -2087,6 +2095,18 @@ public final class CollisionUtil {
         return ret;
     }
 
+    // Leaves start - Configurable collision behavior
+    private static boolean shouldSkip(AABB aabb, VoxelShape blockCollision, AABB singleAABB) {
+        boolean isBlockShape = blockCollision == Shapes.block();
+        return switch (moe.monnairealms.camellia.config.modules.fixes.CollisionBehaviorConfig.behaviorMode) {
+            case moe.monnairealms.camellia.enums.EnumCollisionBehaviorMode.VANILLA -> !voxelShapeIntersectVanilla(aabb, singleAABB);
+            case moe.monnairealms.camellia.enums.EnumCollisionBehaviorMode.PAPER -> !voxelShapeIntersect(aabb, singleAABB);
+            default -> isBlockShape && !voxelShapeIntersectVanilla(aabb, singleAABB) || !isBlockShape && !voxelShapeIntersect(aabb, singleAABB);
+            // All other value as BLOCK_SHAPE_VANILLA to process
+        };
+    }
+    // Leaves end - Configurable collision behavior
+
     public static boolean getEntityHardCollisions(final Level world, final Entity entity, AABB aabb,
                                                   final List<AABB> into, final int collisionFlags, final Predicate<Entity> predicate) {
         final boolean checkOnly = (collisionFlags & COLLISION_FLAG_CHECK_ONLY) != 0;