Add swift package manager support for static chipmunk c library

Package.swift

@@ -0,0 +1,13 @@
+// swift-tools-version:4.2
+
+import PackageDescription
+
+let package = Package(
+    name: "CChipmunk2D",
+    products: [
+        .library(name: "CChipmunk2D", type: .static, targets: ["CChipmunk2D"])
+    ],
+    targets: [
+        .target(name: "CChipmunk2D", path: ".", sources: ["src"], publicHeadersPath: "include")
+    ]
+)

include/CChipmunk2D.h

@@ -0,0 +1,35 @@
+/* Copyright (c) 2018 Murat Yilmaz
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef CCHIPMUNK_2D_H
+#define CCHIPMUNK_2D_H
+
+#include "chipmunk/chipmunk.h"
+#include "chipmunk/chipmunk_ffi.h"
+#include "chipmunk/chipmunk_private.h"
+#include "chipmunk/chipmunk_structs.h"
+#include "chipmunk/chipmunk_unsafe.h"
+#include "chipmunk/cpHastySpace.h"
+#include "chipmunk/cpMarch.h"
+#include "chipmunk/cpPolyline.h"
+#include "chipmunk/cpRobust.h"
+
+#endif

include/chipmunk/cpPolyline.h

@@ -30,6 +30,11 @@ CP_EXPORT cpPolyline *cpPolylineSimplifyVertexes(cpPolyline *line, cpFloat tol);
 /// Get the convex hull of a polyline as a looped polyline.
 CP_EXPORT cpPolyline *cpPolylineToConvexHull(cpPolyline *line, cpFloat tol);
 
+/// Get vertex of polyline at given index.
+CP_EXPORT cpVect cpPolylineGetVertex(cpPolyline* line, int index);
+
+/// Get pointer to vertices of polyline.
+CP_EXPORT cpVect *cpPolylineGetVertices(cpPolyline* line);
 
 /// Polyline sets are collections of polylines, generally built by cpMarchSoft() or cpMarchHard().
 typedef struct cpPolylineSet {

include/module.modulemap

@@ -0,0 +1,5 @@
+module CChipmunk2D {
+    umbrella header "CChipmunk2D.h"
+    link "CChipmunk2D"
+    export *
+}

src/cpPolyline.c

@@ -385,6 +385,20 @@ cpPolylineToConvexHull(cpPolyline *line, cpFloat tol)
 	return cpPolylineShrink(hull);
 }
 
+//MARK: Member Access Functions
+
+cpVect
+cpPolylineGetVertex(cpPolyline* line, int index)
+{
+    return line->verts[index];
+}
+
+cpVect *
+cpPolylineGetVertices(cpPolyline* line)
+{
+    return &line->verts[0];
+}
+
 //MARK: Approximate Concave Decompostition
 
 struct Notch {