Sneaking (#237)

* start implementing sneaking

* fix horizontal_collision being inverted and cleanup

* clippy

* change dimensions and eye height based on pose

* proper support for automatically crouching in certain cases

* fix anticheat issues

* add line to changelog and update a comment

1 files changed, 18 insertions, 16 deletions

diff --git a/azalea-entity/src/attributes.rs b/azalea-entity/src/attributes.rs
index c2a22e9b..021fcd56 100644
--- a/azalea-entity/src/attributes.rs
+++ b/azalea-entity/src/attributes.rs
@@ -9,23 +9,26 @@ use thiserror::Error;
 
 #[derive(Clone, Debug, Component)]
 pub struct Attributes {
-    pub speed: AttributeInstance,
+    pub movement_speed: AttributeInstance,
     pub sneaking_speed: AttributeInstance,
     pub attack_speed: AttributeInstance,
     pub water_movement_efficiency: AttributeInstance,
 
     pub block_interaction_range: AttributeInstance,
     pub entity_interaction_range: AttributeInstance,
+
+    pub step_height: AttributeInstance,
 }
 
 #[derive(Clone, Debug)]
 pub struct AttributeInstance {
     pub base: f64,
     modifiers_by_id: HashMap<ResourceLocation, AttributeModifier>,
+    // TODO: add cache
 }
 
 #[derive(Clone, Debug, Error)]
-#[error("A modifier with this UUID is already present.")]
+#[error("A modifier with this ID is already present.")]
 pub struct AlreadyPresentError;
 
 impl AttributeInstance {
@@ -40,13 +43,12 @@ impl AttributeInstance {
         let mut total = self.base;
         for modifier in self.modifiers_by_id.values() {
             match modifier.operation {
-                AttributeModifierOperation::Addition => total += modifier.amount,
-                AttributeModifierOperation::MultiplyBase => total += self.base * modifier.amount,
-                _ => {}
-            }
-            if let AttributeModifierOperation::MultiplyTotal = modifier.operation {
-                total *= 1.0 + modifier.amount;
-            }
+                AttributeModifierOperation::AddValue => total += modifier.amount,
+                AttributeModifierOperation::AddMultipliedBase => {
+                    total += modifier.amount * self.base
+                }
+                AttributeModifierOperation::AddMultipliedTotal => total *= 1. + modifier.amount,
+            };
         }
         total
     }
@@ -85,30 +87,30 @@ pub struct AttributeModifier {
 
 #[derive(Clone, Debug, Copy, AzBuf)]
 pub enum AttributeModifierOperation {
-    Addition,
-    MultiplyBase,
-    MultiplyTotal,
+    AddValue,
+    AddMultipliedBase,
+    AddMultipliedTotal,
 }
 
 pub fn sprinting_modifier() -> AttributeModifier {
     AttributeModifier {
         id: ResourceLocation::new("sprinting"),
         amount: 0.3f32 as f64,
-        operation: AttributeModifierOperation::MultiplyTotal,
+        operation: AttributeModifierOperation::AddMultipliedTotal,
     }
 }
 pub fn base_attack_speed_modifier(amount: f64) -> AttributeModifier {
     AttributeModifier {
         id: ResourceLocation::new("base_attack_speed"),
         amount,
-        operation: AttributeModifierOperation::Addition,
+        operation: AttributeModifierOperation::AddValue,
     }
 }
 pub fn creative_block_interaction_range_modifier() -> AttributeModifier {
     AttributeModifier {
         id: ResourceLocation::new("creative_mode_block_range"),
         amount: 0.5,
-        operation: AttributeModifierOperation::Addition,
+        operation: AttributeModifierOperation::AddValue,
     }
 }
 
@@ -116,6 +118,6 @@ pub fn creative_entity_interaction_range_modifier() -> AttributeModifier {
     AttributeModifier {
         id: ResourceLocation::new("creative_mode_entity_range"),
         amount: 2.0,
-        operation: AttributeModifierOperation::Addition,
+        operation: AttributeModifierOperation::AddValue,
     }
 }