so the example run fine with the GUI and the rotating box and all ?if yes, now you can replace the code of MGame.cpp by this :
/////////////////////////////////////////////////////////////////////////////////////////////////////////
// SimpleGamePlugin
// MyGame.cpp
//
// Code : Anael Seghezzi
/////////////////////////////////////////////////////////////////////////////////////////////////////////
#include "MyGame.h"
// constructor
MyGame::MyGame(void):
MGame()
{}
// destructor
MyGame::~MyGame(void)
{}
// GUI scene and objects
MScene * GUIScene = NULL;
// custom begin scene
void MyGame::onBeginScene(void)
{
MGame::onBeginScene(); // call the default MGame begin scene
MEngine * engine = MEngine::getInstance(); // get the engine instance
MLevel * level = engine->getLevel(); // get the current level
// get GUI scene
GUIScene = level->getSceneByName("GUIScene");
}
// custom update
void MyGame::update(void)
{
// custom GUI
if(GUIScene) // check if the scene exist
{
// update GUI scene
GUIScene->update();
GUIScene->updateObjectsMatrices();
}
MGame::update(); // call the default MGame update (update current scene physics, animations, script... as done by default)
}
// custom draw
void MyGame::draw(void)
{
MEngine * engine = MEngine::getInstance(); // get the engine instance
MRenderingContext * render = engine->getRenderingContext(); // get the rendering context
// use a smaller viewport for the current scene
int viewport[4];
render->getViewport(viewport);
int marginX = viewport[2]*0.1f; // create a 10% margin of the current screen width : change this for your game
int marginY = viewport[3]*0.1f; // create a 10% margin of the current screen height : change this for your game
render->setViewport(viewport[0]+marginX, viewport[1]+marginY, viewport[2]-marginX*2, viewport[3]-marginY*2);
MGame::draw(); // call the default MGame draw (this will draw the current scene as done by default)
// restore the viewport
render->setViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
// custom GUI
if(GUIScene) // check if the scene exist
{
if(GUIScene->getCamerasNumber() > 0) // check if there is a camera in the GUI scene
{
MOCamera * camera = GUIScene->getCameraByIndex(0); // get the first camera
render->clear(M_BUFFER_DEPTH); // clear depth buffer (to not be affeted by the current scene)
// draw GUI on top
camera->enable();
GUIScene->draw(camera);
}
}
}
- Then use your own game instead of the example or copy the dll in your game directory.
- name your GUI scene "GUIScene" or change the reference name in Game.cpp
- don't use render to texture or scene layer for the gui (it's all done by the cpp)
The code create a smaller viewport to render the current scene and draw the scene named "GUIScene" on top.
The part dealing with the viewport size is this :
int marginX = viewport[2]*0.1f; // create a 10% margin of the current screen width : change this for your game
int marginY = viewport[3]*0.1f; // create a 10% margin of the current screen height : change this for your game
Et voila, a custom game plugin, you'll see it's no so complicated once you understand c/c++ syntax.
In c++ you can access the engine directly, so anything can be done.
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works like a charm ! Many Thanks 
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