Set up simple CMake infrastructure to build Matlab mex files

CMakeLists.txt

@@ -180,3 +180,7 @@ endif()
 if(BUILD_DOCUMENTATION)
 	add_subdirectory(doc)
 endif()
+
+if(GENERATE_MATLAB_BINDINGS)
+	add_subdirectory(matlab)
+endif()

matlab/CMakeLists.txt

+project(matlab-bindings)
+cmake_minimum_required(VERSION 3.7.0)
+
+# If Matlab_ROOT_DIR is set, the Matlab at that location is used.
+find_package(Matlab COMPONENTS MX_LIBRARY REQUIRED)
+
+# See: https://cmake.org/cmake/help/v3.7/module/FindMatlab.html?highlight=findmatlab#command:matlab_add_mex
+matlab_add_mex(
+    NAME eos_matlab
+    #[EXECUTABLE | MODULE | SHARED] # SHARED is the default.
+    SRC private/test.cpp
+    #[OUTPUT_NAME output_name]
+    #[DOCUMENTATION file.txt]
+    #[LINK_TO target1 target2 ...] # OpenCV etc?
+    #[...]
+)
+
+target_include_directories(eos_matlab PRIVATE ${CMAKE_SOURCE_DIR}/3rdparty/mexplus/include)
+
+# Todo: Look at opencv mex... eg Rect, the .c file. Do they do all the dispatching in mexFunc()?
+# Also this may have wrapping for std::vector<T>: https://github.com/kyamagu/mexopencv/blob/master/include/MxArray.hpp

matlab/private/test.cpp

+/*
+ * eos - A 3D Morphable Model fitting library written in modern C++11/14.
+ *
+ * File: matlab/private/test.cpp
+ *
+ * Copyright 2016 Patrik Huber
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "mexplus.h"
+
+#include "mex.h"
+//#include "matrix.h"
+
+#include <iostream>
+
+void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
+{
+	// Check for proper number of input and output arguments:
+	mexPrintf("nlhs: %d, nrhs: %d\n", nlhs, nrhs);
+	if (nrhs != 2) {
+		mexErrMsgIdAndTxt("eos:example:nargin", "example requires two input arguments.");
+	}
+	else if (nlhs >= 1) {
+		mexErrMsgIdAndTxt("eos:example:nargout", "example requires no output argument.");
+	}
+
+	double *vin1, *vin2;
+	vin1 = (double*)mxGetPr(prhs[0]);
+	vin2 = (double*)mxGetPr(prhs[1]);
+	mexPrintf("%f, %f\n", *vin1, *vin2);
+};
+
+void func()
+{
+	int x = 4;
+};
+
+int func1()
+{
+	return 5;
+};
+
+class MyClass
+{
+public:
+	MyClass() = default;
+	int test() {
+		return 6;
+	};
+};