Make theinstant dependency optional, behind a profiler cargo feature

crates/rapier2d-f64/Cargo.toml

@@ -29,6 +29,7 @@ wasm-bindgen = [ "instant/wasm-bindgen" ]
 serde-serialize = [ "nalgebra/serde-serialize", "parry2d-f64/serde-serialize", "serde", "bit-vec/serde", "arrayvec/serde" ]
 enhanced-determinism = [ "simba/libm_force", "parry2d-f64/enhanced-determinism", "indexmap" ]
 debug-render = [ ]
+profiler = [ "instant" ] # Enables the internal profiler.
 
 # Feature used for debugging only.
 debug-disable-legitimate-fe-exceptions = [ ]
@@ -45,7 +46,7 @@ required-features = [ "dim2", "f64" ]
 
 [dependencies]
 vec_map = { version = "0.8", optional = true }
-instant = { version = "0.1", features = [ "now" ]}
+instant = { version = "0.1", features = [ "now" ], optional = true }
 num-traits = "0.2"
 nalgebra = "0.31"
 parry2d-f64 = "0.9"

crates/rapier2d/Cargo.toml

@@ -29,6 +29,7 @@ wasm-bindgen = [ "instant/wasm-bindgen" ]
 serde-serialize = [ "nalgebra/serde-serialize", "parry2d/serde-serialize", "serde", "bit-vec/serde", "arrayvec/serde" ]
 enhanced-determinism = [ "simba/libm_force", "parry2d/enhanced-determinism", "indexmap" ]
 debug-render = [ ]
+profiler = [ "instant" ] # Enables the internal profiler.
 
 # Feature used for debugging only.
 debug-disable-legitimate-fe-exceptions = [ ]
@@ -45,7 +46,7 @@ required-features = [ "dim2", "f32" ]
 
 [dependencies]
 vec_map = { version = "0.8", optional = true }
-instant = { version = "0.1", features = [ "now" ]}
+instant = { version = "0.1", features = [ "now" ], optional = true }
 num-traits = "0.2"
 nalgebra = "0.31"
 parry2d = "0.9"

crates/rapier3d-f64/Cargo.toml

@@ -29,6 +29,7 @@ wasm-bindgen = [ "instant/wasm-bindgen" ]
 serde-serialize = [ "nalgebra/serde-serialize", "parry3d-f64/serde-serialize", "serde", "bit-vec/serde" ]
 enhanced-determinism = [ "simba/libm_force", "parry3d-f64/enhanced-determinism" ]
 debug-render = []
+profiler = [ "instant" ] # Enables the internal profiler.
 
 # Feature used for debugging only.
 debug-disable-legitimate-fe-exceptions = [ ]
@@ -45,7 +46,7 @@ required-features = [ "dim3", "f64" ]
 
 [dependencies]
 vec_map = { version = "0.8", optional = true }
-instant = { version = "0.1", features = [ "now" ]}
+instant = { version = "0.1", features = [ "now" ], optional = true }
 num-traits = "0.2"
 nalgebra = "0.31"
 parry3d-f64 = "0.9"

crates/rapier3d/Cargo.toml

@@ -29,6 +29,7 @@ wasm-bindgen = [ "instant/wasm-bindgen" ]
 serde-serialize = [ "nalgebra/serde-serialize", "parry3d/serde-serialize", "serde", "bit-vec/serde" ]
 enhanced-determinism = [ "simba/libm_force", "parry3d/enhanced-determinism" ]
 debug-render = [ ]
+profiler = [ "instant" ] # Enables the internal profiler.
 
 # Feature used for debugging only.
 debug-disable-legitimate-fe-exceptions = [ ]
@@ -45,7 +46,7 @@ required-features = [ "dim3", "f32" ]
 
 [dependencies]
 vec_map = { version = "0.8", optional = true }
-instant = { version = "0.1", features = [ "now" ]}
+instant = { version = "0.1", features = [ "now" ], optional = true }
 num-traits = "0.2"
 nalgebra = "0.31"
 parry3d = "0.9"

crates/rapier_testbed2d-f64/Cargo.toml

@@ -55,4 +55,4 @@ bevy = {version = "0.7", default-features = false, features = ["bevy_winit", "re
 package = "rapier2d-f64"
 path = "../rapier2d-f64"
 version = "0.12.0"
-features = [ "serde-serialize", "debug-render" ]
+features = [ "serde-serialize", "debug-render", "profiler" ]

crates/rapier_testbed2d/Cargo.toml

@@ -55,4 +55,4 @@ bevy = {version = "0.7", default-features = false, features = ["bevy_winit", "re
 package = "rapier2d"
 path = "../rapier2d"
 version = "0.12.0"
-features = [ "serde-serialize", "debug-render" ]
+features = [ "serde-serialize", "debug-render", "profiler" ]

crates/rapier_testbed3d-f64/Cargo.toml

@@ -53,4 +53,4 @@ bevy = {version = "0.7", default-features = false, features = ["bevy_winit", "re
 package = "rapier3d-f64"
 path = "../rapier3d-f64"
 version = "0.12.0"
-features = [ "serde-serialize", "debug-render" ]
+features = [ "serde-serialize", "debug-render", "profiler" ]

crates/rapier_testbed3d/Cargo.toml

@@ -57,4 +57,4 @@ bevy = {version = "0.7", default-features = false, features = ["bevy_winit", "re
 package = "rapier3d"
 path = "../rapier3d"
 version = "0.12.0"
-features = [ "serde-serialize", "debug-render" ]
+features = [ "serde-serialize", "debug-render", "profiler" ]

src/counters/timer.rs

@@ -4,6 +4,7 @@ use std::fmt::{Display, Error, Formatter};
 #[derive(Copy, Clone, Debug, Default)]
 pub struct Timer {
     time: f64,
+    #[allow(dead_code)] // The field isn’t used if the `profiler` feature isn’t enabled.
     start: Option<f64>,
 }
 
@@ -23,21 +24,30 @@ impl Timer {
 
     /// Start the timer.
     pub fn start(&mut self) {
-        self.time = 0.0;
+        #[cfg(feature = "profiler")]
-        self.start = Some(instant::now());
+        {
+            self.time = 0.0;
+            self.start = Some(instant::now());
+        }
     }
 
     /// Pause the timer.
     pub fn pause(&mut self) {
-        if let Some(start) = self.start {
+        #[cfg(feature = "profiler")]
-            self.time += instant::now() - start;
+        {
+            if let Some(start) = self.start {
+                self.time += instant::now() - start;
+            }
+            self.start = None;
         }
-        self.start = None;
     }
 
     /// Resume the timer.
     pub fn resume(&mut self) {
-        self.start = Some(instant::now());
+        #[cfg(feature = "profiler")]
+        {
+            self.start = Some(instant::now());
+        }
     }
 
     /// The measured time between the last `.start()` and `.pause()` calls.

src/pipeline/physics_pipeline.rs

@@ -54,7 +54,7 @@ impl PhysicsPipeline {
     /// Initializes a new physics pipeline.
     pub fn new() -> PhysicsPipeline {
         PhysicsPipeline {
-            counters: Counters::new(false),
+            counters: Counters::new(true),
             solvers: Vec::new(),
             manifold_indices: Vec::new(),
             joint_constraint_indices: Vec::new(),