This is Bullet Physics wrapper for Unity aimed to support ECS.
Bullet Physics: https://github.com/bulletphysics/bullet3
Generating project
mkdir build
cd build
cmake -G "Visual Studio 15 2017 Win64" ..
bullet4unity and bullet4unity_static are native plugins for Unity. PInvoke codes are generated from PInvokeGenerator.
Classes are exposed as unmanaged structs. Every structs implements own interfaces to mimic inheritance.
public interface IbtCollisionObject : IUnmanagedObject {}
public unsafe struct btCollisionObject : IbtCollisionObject
{
public IntPtr Ptr { get; set; }
[Flags]
public enum AnisotropicFrictionFlags
{
CF_ANISOTROPIC_FRICTION_DISABLED = 0,
CF_ANISOTROPIC_FRICTION = 1,
CF_ANISOTROPIC_ROLLING_FRICTION = 2,
}
public unsafe static btCollisionObject create()
{
return new btCollisionObject() { Ptr = (IntPtr)Library.btCollisionObject__create_0() };
}
}Like Unity's Playable API, class methods are implemented using extension methods.
public unsafe static bool hasContactResponse<T0>(this T0 self)
where T0: unmanaged, Bullet.IbtCollisionObject
{
return Library.btCollisionObject__hasContactResponse_0(self.Ptr);
}
public unsafe static void setCollisionShape<T0, T1>(this T0 self, T1 collisionShape)
where T0: unmanaged, Bullet.IbtCollisionObject
where T1: unmanaged, Bullet.IbtCollisionShape
{
Library.btCollisionObject__setCollisionShape_0(self.Ptr, collisionShape.Ptr);
}
public unsafe static btCollisionShape getCollisionShape<T0>(this T0 self)
where T0: unmanaged, Bullet.IbtCollisionObject
{
return new btCollisionShape() { Ptr = (IntPtr)Library.btCollisionObject__getCollisionShape_0(self.Ptr) };
}