- Add type safety to AddConstraint / RemoveConstraint

Previously, these functions took void* with the intention that the user would always pass a TwoBodyConstraint*.
However, not all constraints inherit from TwoBodyConstraint (ie. VehicleConstraint, or custom constraints).

Author: kcbanner

libs/JoltC/JoltPhysicsC.cpp

@@ -1138,17 +1138,17 @@ JPC_PhysicsSystem_RemoveStepListener(JPC_PhysicsSystem *in_physics_system, void
 }
 //--------------------------------------------------------------------------------------------------
 JPC_API void
-JPC_PhysicsSystem_AddConstraint(JPC_PhysicsSystem *in_physics_system, void *in_two_body_constraint)
+JPC_PhysicsSystem_AddConstraint(JPC_PhysicsSystem *in_physics_system, JPC_Constraint *in_constraint)
 {
-    assert(in_two_body_constraint != nullptr);
-    toJph(in_physics_system)->AddConstraint(static_cast<JPH::TwoBodyConstraint *>(in_two_body_constraint));
+    assert(in_constraint != nullptr);
+    toJph(in_physics_system)->AddConstraint(toJph(in_constraint));
 }
 //--------------------------------------------------------------------------------------------------
 JPC_API void
-JPC_PhysicsSystem_RemoveConstraint(JPC_PhysicsSystem *in_physics_system, void *in_two_body_constraint)
+JPC_PhysicsSystem_RemoveConstraint(JPC_PhysicsSystem *in_physics_system, JPC_Constraint *in_constraint)
 {
-    assert(in_two_body_constraint != nullptr);
-    toJph(in_physics_system)->RemoveConstraint(static_cast<JPH::TwoBodyConstraint *>(in_two_body_constraint));
+    assert(in_constraint != nullptr);
+    toJph(in_physics_system)->RemoveConstraint(toJph(in_constraint));
 }
 //--------------------------------------------------------------------------------------------------
 JPC_API JPC_PhysicsUpdateError

libs/JoltC/JoltPhysicsC.h

@@ -1329,10 +1329,10 @@ JPC_API void
 JPC_PhysicsSystem_RemoveStepListener(JPC_PhysicsSystem *in_physics_system, void *in_listener);
 
 JPC_API void
-JPC_PhysicsSystem_AddConstraint(JPC_PhysicsSystem *in_physics_system, void *in_two_body_constraint);
+JPC_PhysicsSystem_AddConstraint(JPC_PhysicsSystem *in_physics_system, JPC_Constraint *in_constraint);
 
 JPC_API void
-JPC_PhysicsSystem_RemoveConstraint(JPC_PhysicsSystem *in_physics_system, void *in_two_body_constraint);
+JPC_PhysicsSystem_RemoveConstraint(JPC_PhysicsSystem *in_physics_system, JPC_Constraint *in_constraint);
 
 JPC_API JPC_PhysicsUpdateError
 JPC_PhysicsSystem_Update(JPC_PhysicsSystem *in_physics_system,

src/zphysics.zig

@@ -1752,11 +1752,11 @@ pub const PhysicsSystem = opaque {
         c.JPC_PhysicsSystem_RemoveStepListener(@as(*c.JPC_PhysicsSystem, @ptrCast(physics_system)), listener);
     }
 
-    pub fn addConstraint(physics_system: *PhysicsSystem, two_body_constraint: ?*anyopaque) void {
-        c.JPC_PhysicsSystem_AddConstraint(@as(*c.JPC_PhysicsSystem, @ptrCast(physics_system)), two_body_constraint);
+    pub fn addConstraint(physics_system: *PhysicsSystem, constraint: ?*Constraint) void {
+        c.JPC_PhysicsSystem_AddConstraint(@as(*c.JPC_PhysicsSystem, @ptrCast(physics_system)), @ptrCast(constraint));
     }
-    pub fn removeConstraint(physics_system: *PhysicsSystem, two_body_constraint: ?*anyopaque) void {
-        c.JPC_PhysicsSystem_RemoveConstraint(@as(*c.JPC_PhysicsSystem, @ptrCast(physics_system)), two_body_constraint);
+    pub fn removeConstraint(physics_system: *PhysicsSystem, constraint: ?*Constraint) void {
+        c.JPC_PhysicsSystem_RemoveConstraint(@as(*c.JPC_PhysicsSystem, @ptrCast(physics_system)), @ptrCast(constraint));
     }
 
     pub fn update(