1 files changed, 108 insertions, 0 deletions
diff --git a/src_testbed/physics/mod.rs b/src_testbed/physics/mod.rs
new file mode 100644
index 0000000..4b1923f
--- /dev/null
+++ b/src_testbed/physics/mod.rs
@@ -0,0 +1,108 @@
+use crossbeam::channel::Receiver;
+use rapier::dynamics::{IntegrationParameters, JointSet, RigidBodySet};
+use rapier::geometry::{BroadPhase, ColliderSet, ContactEvent, NarrowPhase, ProximityEvent};
+use rapier::math::Vector;
+use rapier::pipeline::{PhysicsPipeline, QueryPipeline};
+
+pub struct PhysicsSnapshot {
+    timestep_id: usize,
+    broad_phase: Vec<u8>,
+    narrow_phase: Vec<u8>,
+    bodies: Vec<u8>,
+    colliders: Vec<u8>,
+    joints: Vec<u8>,
+}
+
+impl PhysicsSnapshot {
+    pub fn new(
+        timestep_id: usize,
+        broad_phase: &BroadPhase,
+        narrow_phase: &NarrowPhase,
+        bodies: &RigidBodySet,
+        colliders: &ColliderSet,
+        joints: &JointSet,
+    ) -> bincode::Result<Self> {
+        Ok(Self {
+            timestep_id,
+            broad_phase: bincode::serialize(broad_phase)?,
+            narrow_phase: bincode::serialize(narrow_phase)?,
+            bodies: bincode::serialize(bodies)?,
+            colliders: bincode::serialize(colliders)?,
+            joints: bincode::serialize(joints)?,
+        })
+    }
+
+    pub fn restore(
+        &self,
+    ) -> bincode::Result<(
+        usize,
+        BroadPhase,
+        NarrowPhase,
+        RigidBodySet,
+        ColliderSet,
+        JointSet,
+    )> {
+        Ok((
+            self.timestep_id,
+            bincode::deserialize(&self.broad_phase)?,
+            bincode::deserialize(&self.narrow_phase)?,
+            bincode::deserialize(&self.bodies)?,
+            bincode::deserialize(&self.colliders)?,
+            bincode::deserialize(&self.joints)?,
+        ))
+    }
+
+    pub fn print_snapshot_len(&self) {
+        let total = self.broad_phase.len()
+            + self.narrow_phase.len()
+            + self.bodies.len()
+            + self.colliders.len()
+            + self.joints.len();
+        println!("Snapshot length: {}B", total);
+        println!("|_ broad_phase: {}B", self.broad_phase.len());
+        println!("|_ narrow_phase: {}B", self.narrow_phase.len());
+        println!("|_ bodies: {}B", self.bodies.len());
+        println!("|_ colliders: {}B", self.colliders.len());
+        println!("|_ joints: {}B", self.joints.len());
+    }
+}
+
+pub struct PhysicsState {
+    pub broad_phase: BroadPhase,
+    pub narrow_phase: NarrowPhase,
+    pub bodies: RigidBodySet,
+    pub colliders: ColliderSet,
+    pub joints: JointSet,
+    pub pipeline: PhysicsPipeline,
+    pub query_pipeline: QueryPipeline,
+    pub integration_parameters: IntegrationParameters,
+    pub gravity: Vector<f32>,
+}
+
+impl PhysicsState {
+    pub fn new() -> Self {
+        Self {
+            broad_phase: BroadPhase::new(),
+            narrow_phase: NarrowPhase::new(),
+            bodies: RigidBodySet::new(),
+            colliders: ColliderSet::new(),
+            joints: JointSet::new(),
+            pipeline: PhysicsPipeline::new(),
+            query_pipeline: QueryPipeline::new(),
+            integration_parameters: IntegrationParameters::default(),
+            gravity: Vector::y() * -9.81,
+        }
+    }
+}
+
+pub struct PhysicsEvents {
+    pub contact_events: Receiver<ContactEvent>,
+    pub proximity_events: Receiver<ProximityEvent>,
+}
+
+impl PhysicsEvents {
+    pub fn poll_all(&self) {
+        while let Ok(_) = self.contact_events.try_recv() {}
+        while let Ok(_) = self.proximity_events.try_recv() {}
+    }
+}