Added osgpresentation example as a test bed for new osgPresentation object model.

First cut of example test bed is to test how easy it is to build against Lua, V8 and Python for purposes of running embedded scripts.

examples/osgpresentation/CMakeLists.txt

@@ -0,0 +1,46 @@
+FIND_PACKAGE(Lua51)
+FIND_PACKAGE(V8)
+FIND_PACKAGE(PythonLibs)
+
+IF (LUA_LIBRARIES AND LUA_INCLUDE_DIR)
+    SET(LUA_FOUND True)
+ENDIF()
+
+
+IF (V8_FOUND)
+    ADD_DEFINITIONS(-DUSE_V8)
+
+    SET(TARGET_EXTERNAL_LIBRARIES ${TARGET_EXTERNAL_LIBRARIES} ${V8_LIBRARY})
+    INCLUDE_DIRECTORIES(${V8_INCLUDE_DIR} )
+
+    MESSAGE("We have found V8")
+ELSE()
+    MESSAGE("We have NOT found V8")
+ENDIF()
+
+IF (LUA_FOUND)
+    ADD_DEFINITIONS(-DUSE_LUA)
+
+    SET(TARGET_EXTERNAL_LIBRARIES ${TARGET_EXTERNAL_LIBRARIES} ${LUA_LIBRARY})
+    INCLUDE_DIRECTORIES(${LUA_INCLUDE_DIR} )
+
+    MESSAGE("We have found Lua")
+ELSE()
+    MESSAGE("We have NOT found Lua")
+ENDIF()
+
+IF (PYTHONLIBS_FOUND)
+    MESSAGE("We have found Python")
+
+    SET(TARGET_EXTERNAL_LIBRARIES ${TARGET_EXTERNAL_LIBRARIES} ${PYTHON_LIBRARY})
+    INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIR} )
+
+    ADD_DEFINITIONS(-DUSE_PYTHON)
+ELSE()
+   MESSAGE("We have NOT found Python")
+ENDIF()
+
+SET(TARGET_SRC osgpresentation.cpp )
+
+#### end var setup  ###
+SETUP_EXAMPLE(osgpresentation)

examples/osgpresentation/osgpresentation.cpp

@@ -0,0 +1,208 @@
+/* Copyright Robert Osfield, Licensed under the GPL
+ *
+ * Experimental base for refactor of Present3D
+ *
+*/
+
+#include <osg/Geode>
+#include <osg/Geometry>
+
+#include <osgDB/ReadFile>
+#include <osgDB/FileUtils>
+
+#include <osgGA/TrackballManipulator>
+#include <osgViewer/Viewer>
+
+// hacky experiment with create lua, v8 and python to run scripts.
+
+#ifdef USE_LUA
+
+extern "C" {
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+}
+
+void runLua(const std::string& str)
+{
+    OSG_NOTICE<<std::endl<<"runLua("<<str<<")"<<std::endl;
+
+    lua_State* lua = lua_open();
+
+    luaL_openlibs(lua);
+
+    std::string filePath = str;
+    if(osgDB::fileExists(filePath))
+    {
+        if(luaL_dofile(lua, filePath.c_str()))
+        {
+            OSG_NOTICE << "LuaEngine::runFile - " << lua_tostring(lua, -1) << std::endl;
+        }
+
+    }
+    else
+    {
+        OSG_NOTICE<<" parameter="<<filePath<<" not a valid file."<<std::endl;
+    }
+
+    lua_close(lua);
+}
+
+#endif
+
+#ifdef USE_PYTHON
+
+#include <Python.h>
+
+void runPython(const std::string& str)
+{
+    OSG_NOTICE<<std::endl<<"runPython("<<str<<")"<<std::endl;
+
+    Py_InitializeEx(0);
+
+    PyObject* py_main = PyModule_GetDict(PyImport_AddModule("__main__"));
+
+    std::string filePath = str;
+    if(osgDB::fileExists(filePath))
+    {
+        FILE*     f = fopen(filePath.c_str(), "r");
+        PyObject* r = PyRun_File(f, filePath.c_str(), Py_file_input, py_main, py_main);
+
+        fclose(f);
+
+        if(!r) {
+            r = PyErr_Occurred();
+
+            if(r) {
+                // The following snippet lets us get the return code. That is: if the
+                // script is stopped with sys.exit() or similar. We could use this
+                // return code to do something sensible... later.
+                if(PyErr_ExceptionMatches(PyExc_SystemExit)) {
+                    PyObject* ty = 0;
+                    PyObject* er = 0;
+                    PyObject* tr = 0;
+
+                    PyErr_Fetch(&ty, &er, &tr);
+
+                    Py_DECREF(ty);
+                    Py_DECREF(er);
+                    Py_DECREF(er);
+                }
+
+                else {
+                    PyErr_Print();
+                    PyErr_Clear();
+                }
+            }
+        }
+    }
+
+    Py_Finalize();
+}
+
+#endif
+
+
+#ifdef USE_V8
+
+#include <v8.h>
+
+void runV8(const std::string& str)
+{
+    OSG_NOTICE<<std::endl<<"runV8("<<str<<")"<<std::endl;
+
+    v8::Isolate* isolate = v8::Isolate::New();
+
+    {
+        v8::Locker locker(isolate);
+        v8::Isolate::Scope isolate_scope(isolate);
+
+        // Create a stack-allocated handle scope.
+        v8::HandleScope handle_scope;
+
+        v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
+        v8::Persistent<v8::Context> globalContext = v8::Context::New(NULL, global);
+        v8::Persistent<v8::ObjectTemplate> globalTemplate = v8::Persistent<v8::ObjectTemplate>::New(global);
+
+        std::string filePath = str;
+        if(osgDB::fileExists(filePath))
+        {
+            std::string js_source;
+            std::ifstream fin(filePath.c_str());
+            if (fin)
+            {
+                // read file in the crude way.
+                while(fin)
+                {
+                    int c = fin.get();
+                    if (c>=0 && c<=255)
+                    {
+                        js_source.push_back(c);
+                    }
+                }
+
+                // Create a nested handle scope
+                v8::HandleScope local_handle_scope;
+
+                // Enter the global context
+                v8::Context::Scope context_scope(globalContext);
+
+                // Create a string containing the JavaScript source code.
+                v8::Handle<v8::String> source = v8::String::New(js_source.c_str());
+
+                // Compile the source code.
+                v8::Handle<v8::Script> script = v8::Script::Compile(source);
+
+                // Run the script to get the result.
+                v8::Handle<v8::Value> result = script->Run();
+
+                // Convert the result to an ASCII string and print it.
+                v8::String::AsciiValue ascii(result);
+                printf("%s\n", *ascii);
+            }
+        }
+
+    globalTemplate.Dispose();
+    globalContext.Dispose();
+  }
+  isolate->Dispose();
+
+}
+#endif
+
+int main(int argc, char** argv)
+{
+    osg::ArgumentParser arguments(&argc, argv);
+
+    osgViewer::Viewer viewer(arguments);
+
+    std::string str;
+
+#ifdef USE_LUA
+    while (arguments.read("--lua",str))
+    {
+        runLua(str);
+    }
+#endif
+
+#ifdef USE_V8
+    while (arguments.read("--js",str))
+    {
+        runV8(str);
+    }
+#endif
+
+#ifdef USE_PYTHON
+    while (arguments.read("--python",str))
+    {
+        runPython(str);
+    }
+#endif
+
+    // create the model
+    osg::ref_ptr<osg::Node> model = osgDB::readNodeFiles(arguments);
+    if (!model) return 1;
+
+    viewer.setSceneData( model.get() );
+    return viewer.run();
+}