From 96fa285132bf88462c33c5b24cc1b241fb3d4d73 Mon Sep 17 00:00:00 2001
From: Willem Jan Palenstijn <Willem.Jan.Palenstijn@cwi.nl>
Date: Thu, 21 Jan 2016 14:30:32 +0100
Subject: Initialize Python plugins when available in Matlab

---
 matlab/mex/astra_mex_plugin_c.cpp | 25 ++++++++++++++++++++++++-
 matlab/mex/mexInitFunctions.cpp   |  8 ++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)

(limited to 'matlab/mex')

diff --git a/matlab/mex/astra_mex_plugin_c.cpp b/matlab/mex/astra_mex_plugin_c.cpp
index 627e34a..9bd4446 100644
--- a/matlab/mex/astra_mex_plugin_c.cpp
+++ b/matlab/mex/astra_mex_plugin_c.cpp
@@ -37,10 +37,31 @@ $Id$
 
 #include "astra/PluginAlgorithm.h"
 
+#include <Python.h>
+
 using namespace std;
 using namespace astra;
 
 
+//-----------------------------------------------------------------------------------------
+/** astra_mex_plugin('init');
+ *
+ * Initialize plugin support by initializing python and importing astra
+ */
+void astra_mex_plugin_init()
+{
+    if(!Py_IsInitialized()){
+        Py_Initialize();
+        PyEval_InitThreads();
+    }
+
+    // Importing astra may be overkill, since we only need to initialize
+    // PythonPluginAlgorithmFactory from astra.plugin_c.
+    PyObject *mod = PyImport_ImportModule("astra");
+    Py_DECREF(mod);
+}
+
+
 //-----------------------------------------------------------------------------------------
 /** astra_mex_plugin('get_registered');
  *
@@ -128,7 +149,9 @@ void mexFunction(int nlhs, mxArray* plhs[],
 	initASTRAMex();
 
 	// SWITCH (MODE)
-	if (sMode ==  std::string("get_registered")) {
+	if (sMode == "init") {
+		astra_mex_plugin_init();
+	} else if (sMode ==  std::string("get_registered")) {
 		astra_mex_plugin_get_registered(nlhs, plhs, nrhs, prhs);
 	}else if (sMode ==  std::string("get_help")) {
 		astra_mex_plugin_get_help(nlhs, plhs, nrhs, prhs);
diff --git a/matlab/mex/mexInitFunctions.cpp b/matlab/mex/mexInitFunctions.cpp
index bd3df2c..7245af2 100644
--- a/matlab/mex/mexInitFunctions.cpp
+++ b/matlab/mex/mexInitFunctions.cpp
@@ -23,5 +23,13 @@ void initASTRAMex(){
     if(!astra::CLogger::setCallbackScreen(&logCallBack)){
         mexErrMsgTxt("Error initializing mex functions.");
     }
+
     mexIsInitialized=true;
+
+
+    // If we have support for plugins, initialize them.
+    // (NB: Call this after setting mexIsInitialized, to avoid recursively
+    //      calling initASTRAMex)
+    mexEvalString("if exist('astra_mex_plugin_c') == 3; astra_mex_plugin_c('init'); end");
+
 }
-- 
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