Entity flag fixes for shulkers, player entity crawling, out-of-block pushing (#5670)

* Some fixes related to flags.

* Fixed comments.

* Cleanup some if statements.

core/src/main/java/org/geysermc/geyser/entity/type/living/monster/ShulkerEntity.java

@@ -52,6 +52,12 @@ public class ShulkerEntity extends GolemEntity {
         // As of 1.19.4, it seems Java no longer sends the shulker color if it's the default color on initial spawn
         // We still need the special case for 16 color in setShulkerColor though as it will send it for an entity metadata update
         dirtyMetadata.put(EntityDataTypes.VARIANT, 16);
+
+        setFlag(EntityFlag.COLLIDABLE, true);
+
+        // This is vanilla behaviour yes (BDS does this), without this as of 1.21.93 entity became fully invisible.
+        // Doing this allow the invisible parity support inside GeyserOptionalPack to works again.
+        setFlag(EntityFlag.RENDER_WHEN_INVISIBLE, true);
     }
 
     public void setAttachedFace(EntityMetadata<Direction, ?> entityMetadata) {

core/src/main/java/org/geysermc/geyser/entity/type/player/PlayerEntity.java

@@ -51,6 +51,7 @@ import org.geysermc.geyser.entity.attribute.GeyserAttributeType;
 import org.geysermc.geyser.entity.type.Entity;
 import org.geysermc.geyser.entity.type.LivingEntity;
 import org.geysermc.geyser.entity.type.living.animal.tameable.ParrotEntity;
+import org.geysermc.geyser.level.block.Blocks;
 import org.geysermc.geyser.session.GeyserSession;
 import org.geysermc.geyser.util.ChunkUtils;
 import org.geysermc.mcprotocollib.protocol.data.game.entity.metadata.EntityMetadata;
@@ -422,6 +423,29 @@ public class PlayerEntity extends LivingEntity implements GeyserPlayerEntity {
         dirtyMetadata.put(EntityDataTypes.SCORE, show ? cachedScore : "");
     }
 
+    @Override
+    public void setPose(Pose pose) {
+        super.setPose(pose);
+        setFlag(EntityFlag.SWIMMING, false);
+        setFlag(EntityFlag.CRAWLING, false);
+
+        if (pose == Pose.SWIMMING) {
+            // This is just for, so we know if player is swimming or crawling.
+            if (session.getGeyser().getWorldManager().blockAt(session, this.position().toInt()).is(Blocks.WATER)) {
+                setFlag(EntityFlag.SWIMMING, true);
+            } else {
+                setFlag(EntityFlag.CRAWLING, true);
+                // Look at https://github.com/GeyserMC/Geyser/issues/5316, we're fixing this by spoofing player pitch to 0.
+                updateRotation(this.yaw, 0, this.onGround);
+            }
+        }
+    }
+
+    @Override
+    public void setPitch(float pitch) {
+        super.setPitch(getFlag(EntityFlag.CRAWLING) ? 0 : pitch);
+    }
+
     @Override
     public void setDimensionsFromPose(Pose pose) {
         float height;

core/src/main/java/org/geysermc/geyser/entity/type/player/SessionPlayerEntity.java

@@ -124,6 +124,14 @@ public class SessionPlayerEntity extends PlayerEntity {
         valid = true;
     }
 
+    @Override
+    protected void initializeMetadata() {
+        super.initializeMetadata();
+
+        // This allows player to be slowly push towards the closet space when stuck inside block instead of instantly moved out.
+        setFlag(EntityFlag.PUSH_TOWARDS_CLOSEST_SPACE, true);
+    }
+
     @Override
     protected void setClientSideSilent() {
         // Do nothing, since we want the session player to hear their own footstep sounds for example.