[Experimental] Elytra Movement (#291)

* Experimental Entity Metadata

* Axolotl variants

* cleanup logging-

* Mooshroom

* Slime and Magma Cube

* Rabbit and Parrot variants, Sheep colour

* Elytra Movement

* Fix rebase issues

* More fixes

* hhhh

* Some extra conditions

Author: Exterminate5573

src/main/java/net/raphimc/viabedrock/api/model/entity/ClientPlayerEntity.java

@@ -72,6 +72,7 @@ public class ClientPlayerEntity extends PlayerEntity {
     private boolean horizontalCollision;
     private boolean sneaking;
     private boolean sprinting;
+    private boolean gliding;
 
     // Misc data
     private GameType gameType;
@@ -363,6 +364,14 @@ public void setSprinting(final boolean sprinting) {
         this.updateAttributes(new EntityAttribute[]{newMovementAttribute.withValue(newMovementAttribute.computeCurrentValue())});
     }
 
+    public boolean isGliding() {
+        return this.gliding;
+    }
+
+    public void setGliding(final boolean gliding) {
+        this.gliding = gliding;
+    }
+
     public GameType gameType() {
         return this.gameType;
     }

src/main/java/net/raphimc/viabedrock/experimental/rewriter/EntityMetadataRewriter.java

@@ -62,7 +62,10 @@ public static boolean rewrite(final UserConnection user, final Entity entity, fi
                 if (bedrockFlags.contains(ActorFlags.INVISIBLE)) {
                     javaBitMask |= (1 << 5);
                 }
-                
+                if (bedrockFlags.contains(ActorFlags.GLIDING)) {
+                    javaBitMask |= (byte) (1 << 7);
+                }
+
                 javaEntityData.add(new EntityData(entity.getJavaEntityDataIndex(EntityDataFields.SHARED_FLAGS), VersionedTypes.V26_2.entityDataTypes().byteType, javaBitMask));
 
                 javaEntityData.add(new EntityData(entity.getJavaEntityDataIndex(EntityDataFields.SILENT), VersionedTypes.V26_2.entityDataTypes().booleanType, bedrockFlags.contains(ActorFlags.SILENT)));

src/main/java/net/raphimc/viabedrock/protocol/packet/ClientPlayerPackets.java

@@ -285,6 +285,12 @@ protected void register() {
                     clientPlayer.setSprinting(false);
                     clientPlayer.addAuthInputData(PlayerAuthInputPacket_InputData.StopSprinting);
                 }
+                case START_FALL_FLYING -> {
+                    if (ViaBedrock.getConfig().shouldEnableExperimentalFeatures()) {
+                        clientPlayer.setGliding(true);
+                        clientPlayer.addAuthInputData(PlayerAuthInputPacket_InputData.StartGliding);
+                    }
+                }
                 default -> throw new IllegalStateException("Unhandled PlayerCommandAction: " + action);
             }
         });
@@ -458,6 +464,17 @@ protected void register() {
                 clientPlayer.addAuthInputData(PlayerAuthInputPacket_InputData.StartJumping);
             }
 
+            if (clientPlayer.isGliding() && (
+                    clientPlayer.isOnGround() ||
+                    clientPlayer.effects().containsKey("minecraft:levitation") ||
+                    clientPlayer.entityFlags().contains(ActorFlags.WALLCLIMBING) ||
+                    clientPlayer.entityFlags().contains(ActorFlags.IN_ASCENDABLE_BLOCK) ||
+                    clientPlayer.entityFlags().contains(ActorFlags.IN_SCAFFOLDING)
+            )) {
+                clientPlayer.setGliding(false);
+                clientPlayer.addAuthInputData(PlayerAuthInputPacket_InputData.StopGliding);
+            }
+
             if (!clientPlayer.isInitiallySpawned() || clientPlayer.isDead()) {
                 wrapper.cancel();
                 return;