Fix gliderwield downhill run jitter

CHANGELOG.md

@@ -63,6 +63,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Campfires now despawn when underwater
 - Players no longer spawn underground if their waypoint is underground
 - Map will now zoom around the cursor's position and drag correctly
+- No more jittering while running down slopes with the glider out
 
 ## [0.10.0] - 2021-06-12
 

client/src/lib.rs

@@ -1231,7 +1231,7 @@ impl Client {
             .map(|cs| {
                 matches!(
                     cs,
-                    comp::CharacterState::GlideWield | comp::CharacterState::Glide(_)
+                    comp::CharacterState::GlideWield(_) | comp::CharacterState::Glide(_)
                 )
             });
 

common/src/comp/character_state.rs

@@ -59,7 +59,7 @@ pub enum CharacterState {
     Talk,
     Sneak,
     Glide(glide::Data),
-    GlideWield,
+    GlideWield(glide_wield::Data),
     /// A stunned state
     Stunned(stunned::Data),
     /// A basic blocking state
@@ -189,7 +189,7 @@ impl CharacterState {
                 | CharacterState::Equipping(_)
                 | CharacterState::Dance
                 | CharacterState::Glide(_)
-                | CharacterState::GlideWield
+                | CharacterState::GlideWield(_)
                 | CharacterState::Talk
                 | CharacterState::Roll(_),
         )
@@ -228,7 +228,7 @@ impl CharacterState {
             CharacterState::Talk => states::talk::Data.behavior(j),
             CharacterState::Climb(data) => data.behavior(j),
             CharacterState::Glide(data) => data.behavior(j),
-            CharacterState::GlideWield => states::glide_wield::Data.behavior(j),
+            CharacterState::GlideWield(data) => data.behavior(j),
             CharacterState::Stunned(data) => data.behavior(j),
             CharacterState::Sit => states::sit::Data::behavior(&states::sit::Data, j),
             CharacterState::Dance => states::dance::Data::behavior(&states::dance::Data, j),
@@ -264,7 +264,7 @@ impl CharacterState {
             CharacterState::Talk => states::talk::Data.handle_event(j, action),
             CharacterState::Climb(data) => data.handle_event(j, action),
             CharacterState::Glide(data) => data.handle_event(j, action),
-            CharacterState::GlideWield => states::glide_wield::Data.handle_event(j, action),
+            CharacterState::GlideWield(data) => data.handle_event(j, action),
             CharacterState::Stunned(data) => data.handle_event(j, action),
             CharacterState::Sit => states::sit::Data::handle_event(&states::sit::Data, j, action),
             CharacterState::Dance => {

common/src/states/glide.rs

@@ -4,7 +4,10 @@ use crate::{
         fluid_dynamics::angle_of_attack, inventory::slot::EquipSlot, CharacterState, Ori,
         StateUpdate, Vel,
     },
-    states::behavior::{CharacterBehavior, JoinData},
+    states::{
+        behavior::{CharacterBehavior, JoinData},
+        glide_wield,
+    },
     util::{Dir, Plane, Projection},
 };
 use serde::{Deserialize, Serialize};
@@ -77,8 +80,7 @@ impl CharacterBehavior for Data {
         if data.physics.on_ground.is_some()
             && (data.vel.0 - data.physics.ground_vel).magnitude_squared() < 2_f32.powi(2)
         {
-            update.character = CharacterState::GlideWield;
-            update.ori = update.ori.to_horizontal();
+            update.character = CharacterState::GlideWield(glide_wield::Data::default());
         } else if data.physics.in_liquid().is_some()
             || data
                 .inventory
@@ -86,7 +88,6 @@ impl CharacterBehavior for Data {
                 .is_none()
         {
             update.character = CharacterState::Idle;
-            update.ori = update.ori.to_horizontal();
         } else if !handle_climb(data, &mut update) {
             let air_flow = data
                 .physics
@@ -193,8 +194,6 @@ impl CharacterBehavior for Data {
                 inputs_disabled,
                 ..*self
             });
-        } else {
-            update.ori = update.ori.to_horizontal();
         }
 
         update
@@ -203,7 +202,6 @@ impl CharacterBehavior for Data {
     fn unwield(&self, data: &JoinData) -> StateUpdate {
         let mut update = StateUpdate::from(data);
         update.character = CharacterState::Idle;
-        update.ori = update.ori.to_horizontal();
         update
     }
 }

common/src/states/glide_wield.rs

@@ -6,8 +6,18 @@ use crate::{
         glide,
     },
 };
+use serde::{Deserialize, Serialize};
 
-pub struct Data;
+#[derive(Copy, Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct Data {
+    // time since left ground, for preventing state transition
+    // before block snapping kicks in
+    timer: f32,
+}
+
+impl Default for Data {
+    fn default() -> Self { Self { timer: 0.0 } }
+}
 
 impl CharacterBehavior for Data {
     fn behavior(&self, data: &JoinData) -> StateUpdate {
@@ -21,7 +31,13 @@ impl CharacterBehavior for Data {
 
         // If not on the ground while wielding glider enter gliding state
         if data.physics.on_ground.is_none() {
-            update.character = CharacterState::Glide(glide::Data::new(10.0, 0.6, *data.ori));
+            update.character = if self.timer > 0.3 {
+                CharacterState::Glide(glide::Data::new(10.0, 0.6, *data.ori))
+            } else {
+                CharacterState::GlideWield(Self {
+                    timer: self.timer + data.dt.0,
+                })
+            };
         }
         if data
             .physics

common/src/states/utils.rs

@@ -639,7 +639,7 @@ pub fn attempt_glide_wield(data: &JoinData<'_>, update: &mut StateUpdate) {
             .unwrap_or(false)
         && data.body.is_humanoid()
     {
-        update.character = CharacterState::GlideWield;
+        update.character = CharacterState::GlideWield(glide_wield::Data::default());
     }
 }
 

flake.lock

@@ -24,11 +24,11 @@
         "rustOverlay": "rustOverlay"
       },
       "locked": {
-        "lastModified": 1625378930,
-        "narHash": "sha256-iBnCmrLweBmtN9VkG6AX4wSE5UUF//4VtfX6Ebhbaew=",
+        "lastModified": 1627752074,
+        "narHash": "sha256-iuOGIbJC4hn1XqwrBjiol6j0Xj+AImND6Z9fP/6Za74=",
         "owner": "yusdacra",
         "repo": "nix-cargo-integration",
-        "rev": "4d6efcfd0bc6c6235b180837257ab8020f108c23",
+        "rev": "47e6414440c66bfd44a0ea07d64ca62075470f62",
         "type": "github"
       },
       "original": {
@@ -39,11 +39,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1625375231,
-        "narHash": "sha256-dbp2RRftypbAYad/xhDBBG0N7s1WQW+T4jazimvtvRo=",
+        "lastModified": 1627533199,
+        "narHash": "sha256-NyIUcNevwtsMBINn56jnDF8wz3TV1AFxw+Vw6JMnkyE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8aff53d3cf23b5eb67c0ba9ba2392d694ade3930",
+        "rev": "dd98b100651cfbb8804f32d852f75ef7c97a6b74",
         "type": "github"
       },
       "original": {
@@ -62,11 +62,11 @@
     "rustOverlay": {
       "flake": false,
       "locked": {
-        "lastModified": 1625364738,
-        "narHash": "sha256-TPlpEcywGnB8jNIPOlCqFVbioskGOpasrVhxdw0BHzA=",
+        "lastModified": 1627697717,
+        "narHash": "sha256-ij7rk2VkPpNf0NTbpP5jfbwuIWfrLXN00pZ+pizGnGM=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "f08a653d9d6bbf06b5cc5dd1e570f1c449acbcf3",
+        "rev": "6d957c2105a5a548211c412fbc97bae81b7b8eb6",
         "type": "github"
       },
       "original": {

server/src/sys/agent.rs

@@ -291,7 +291,7 @@ impl<'a> System<'a> for Sys {
 
                     let is_gliding = matches!(
                         read_data.char_states.get(entity),
-                        Some(CharacterState::GlideWield | CharacterState::Glide(_))
+                        Some(CharacterState::GlideWield(_) | CharacterState::Glide(_))
                     ) && physics_state.on_ground.is_none();
 
                     if let Some(pid) = agent.position_pid_controller.as_mut() {

voxygen/egui/src/character_states.rs

@@ -24,7 +24,7 @@ pub fn draw_char_state_group(
         CharacterState::Dance
         | CharacterState::Idle
         | CharacterState::Sit
-        | CharacterState::GlideWield
+        | CharacterState::GlideWield(_)
         | CharacterState::Sneak
         | CharacterState::Talk
         | CharacterState::Wielding => {},