Re: [Swig-user] change SWIG c++ aligned class into c# struct during SWIG?

[Bourke F. <ch...@gm...>]

I've made progress, but I'm still working on the ctype, cstype, csin, in,
directorout, directorin, ...

%immutable;
%typemap(csbase) btVector3 ""
%typemap(csclassmodifiers) btVector3 "public struct"
%typemap(csimports) btVector3 "\nusing System;\nusing
System.Runtime.InteropServices;\n"
%typemap(csinterfaces) btVector3 ""
%typemap(csinterfaces_derived) btVector3 ""

%typemap(csfinalize) btVector3 ""
%typemap(csdestruct) btVector3 ""
%typemap(csdestruct_derived) btVector3 ""

%typemap(csbody) btVector3 %{
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public float[] m_floats;

        public float X { get { return m_floats[0]; } }
        public float Y { get { return m_floats[1]; } }
        public float Z { get { return m_floats[2]; } }

        public $csclassname(float x, float y, float z)
        {
            m_floats = new float[] { x, y, z, 0 };
        }
%}

%typemap(csattributes) btVector3
"[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi)]"
%typemap(csbody_derived) btVector3 ""
%typemap(csbody) btVector3 *, btVector3 &, btVector3 [] ""
%typemap(cscode) btVector3 ""

%nodefaultctor;
%nodefaultdtor;
%mutable;


C.H. Bourke Floyd IV


On Sun, May 6, 2012 at 11:28 PM, Bourke Floyd <ch...@gm...> wrote:

> I want to change the output of my SWIG of the class btVector3 to a struct
> btVector3. The main issue I'm having is that I'm using BulletPhysics and I
> need a few core components to use structs as normal to prevent cache
> trashing.
>
> "btVector3 can be used to represent 3D points and vectors. It has an
> un-used w component to suit 16-byte alignment when btVector3 is stored in
> containers."
>
> ************************** C++ aligned class ************************
> __declspec(align(16)) class btVector3
> {
> public:
> union {
> __m128 mVec128;
>  btScalar m_floats[4];
> };
> //...
> }
>
> ************************** c# Wrapper OUTPUT ************************
>
> public class btVector3 : IDisposable {
>   private HandleRef swigCPtr;
>   protected bool swigCMemOwn;
>
>   internal btVector3(IntPtr cPtr, bool cMemoryOwn) {
>     swigCMemOwn = cMemoryOwn;
>     swigCPtr = new HandleRef(this, cPtr);
>   }
>
>   internal static HandleRef getCPtr(btVector3 obj) {
>     return (obj == null) ? new HandleRef(null, IntPtr.Zero) : obj.swigCPtr;
>   }
>
>   ~btVector3() {
>     Dispose();
>   }
>
>   public virtual void Dispose() {
>     lock(this) {
>       if (swigCPtr.Handle != IntPtr.Zero) {
>         if (swigCMemOwn) {
>           swigCMemOwn = false;
>           BulletPhysicsPINVOKE.delete_btVector3(swigCPtr);
>         }
>         swigCPtr = new HandleRef(null, IntPtr.Zero);
>       }
>       GC.SuppressFinalize(this);
>     }
>   }
> ///...
> }
>
> ************************** C# Wrapper GOAL (TARGET)
> ************************
> [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
> public struct btVector3 {
>
>     [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
>     public float[] m_floats;
>
> }
>
> }
>
>
> C.H. Bourke Floyd IV
>