Ultimately use setting in day cycle updates.

(First functional commit.)

client/src/lib.rs

@@ -1804,6 +1804,7 @@ impl Client {
             },
             true,
             None,
+            &self.connected_server_constants
         );
         // TODO: avoid emitting these in the first place
         let _ = self

common/src/shared_server_config.rs

@@ -4,4 +4,12 @@ use serde::{Serialize, Deserialize};
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct ServerConstants {
     pub day_cycle_coefficient: f64,
+}
+impl Default for ServerConstants {
+    fn default() -> Self {
+        ServerConstants {
+            // == 30.0 via server settings (the default)
+            day_cycle_coefficient: 24.0 * 2.0,
+        }
+    }
 }

common/state/src/state.rs

@@ -22,6 +22,7 @@ use common::{
     trade::Trades,
     vol::{ReadVol, WriteVol},
     weather::{Weather, WeatherGrid},
+    shared_server_config::ServerConstants,
 };
 use common_base::span;
 use common_ecs::{PhysicsMetrics, SysMetrics};
@@ -39,9 +40,6 @@ use std::{sync::Arc, time::Instant};
 use timer_queue::TimerQueue;
 use vek::*;
 
-/// How much faster should an in-game day be compared to a real day?
-// TODO: Don't hard-code this.
-const DAY_CYCLE_FACTOR: f64 = 24.0 * 2.0;
 /// At what point should we stop speeding up physics to compensate for lag? If
 /// we speed physics up too fast, we'd skip important physics events like
 /// collisions. This constant determines the upper limit. If delta time exceeds
@@ -597,6 +595,7 @@ impl State {
         add_systems: impl Fn(&mut DispatcherBuilder),
         update_terrain_and_regions: bool,
         mut metrics: Option<&mut StateTickMetrics>,
+        server_constants: &ServerConstants
     ) {
         span!(_guard, "tick", "State::tick");
 
@@ -610,8 +609,7 @@ impl State {
         }
 
         // Change the time accordingly.
-        self.ecs.write_resource::<TimeOfDay>().0 += dt.as_secs_f64() * DAY_CYCLE_FACTOR;
-        self.ecs.write_resource::<Time>().0 += dt.as_secs_f64();
+        self.ecs.write_resource::<TimeOfDay>().0 += dt.as_secs_f64() * server_constants.day_cycle_coefficient;
 
         // Update delta time.
         // Beyond a delta time of MAX_DELTA_TIME, start lagging to avoid skipping

common/systems/tests/character_state.rs

@@ -9,7 +9,7 @@ mod tests {
         terrain::{MapSizeLg, TerrainChunk},
         uid::Uid,
         util::Dir,
-        SkillSetBuilder,
+        SkillSetBuilder, shared_server_config::ServerConstants,
     };
     use common_ecs::dispatch;
     use common_state::State;
@@ -81,6 +81,8 @@ mod tests {
             },
             false,
             None,
+            // Dummy ServerConstants
+            &ServerConstants::default(),
         );
     }
 

common/systems/tests/phys/basic.rs

@@ -1,6 +1,10 @@
 use crate::utils;
 use approx::assert_relative_eq;
-use common::{comp::Controller, resources::Time};
+use common::{
+    comp::Controller,
+    resources::Time,
+    shared_server_config::ServerConstants,
+};
 use specs::WorldExt;
 use std::error::Error;
 use utils::{DT, DT_F64, EPSILON};
@@ -18,6 +22,7 @@ fn simple_run() {
         },
         false,
         None,
+        &ServerConstants::default(),
     );
 }
 

common/systems/tests/phys/utils.rs

@@ -11,6 +11,7 @@ use common::{
     terrain::{
         Block, BlockKind, MapSizeLg, SpriteKind, TerrainChunk, TerrainChunkMeta, TerrainGrid,
     },
+    shared_server_config::ServerConstants,
 };
 use common_ecs::{dispatch, System};
 use common_net::sync::WorldSyncExt;
@@ -64,6 +65,7 @@ pub fn tick(state: &mut State, dt: Duration) {
         },
         false,
         None,
+        &ServerConstants::default(),
     );
 }
 

server/src/lib.rs

@@ -710,6 +710,7 @@ impl Server {
             },
             false,
             Some(&mut state_tick_metrics),
+            &self.server_constants
         );
 
         let before_handle_events = Instant::now();