OGRE + OIS frame monitoring FrameListener, non-buffered input, and buffered Input

The main cycle (Root: startRendering) of Ogre is similar to this:

1. The Root object calls the frameStarted method in all registered FrameListeners.

2. render a frame of the Root object.

3. The Root object calls the frameEnded method in all registered FrameListeners.

 

Frame Registration Method

MRoot-> addFrameListener (mFrameListener );

 

Each frame has the methods frameStarted and frameEnded.

Bool frameStarted (const FrameEvent & evt)
Bool frameEnded (const FrameEvent & evt)

The above two methods can be used to implement what needs to be done in each frame.

This enables non-buffering of the mouse and keyboard.

Steps:

1. Set the frame listener Inheritance Method public ExampleFrameListener

Set how to handle the mouse and keyboard

In the constructor: ExampleFrameListener (win, cam, false, false)

In frameStarted:

2. mouse and keyboard pointer capture events

MMouse-> capture ();
MKeyboard-> capture ();

3. process the event type accordingly.

If (mKeyboard-> isKeyDown (OIS: KC_ESCAPE ))
Return false;
If (mMouse-> getMouseState (). buttonDown (OIS: MB_Left ))

Return true;

Mouse and keyboard Buffering

1. Set the frame listener Inheritance Method public ExampleFrameListener, public OIS: MouseListener, public OIS: KeyListener

Set how to handle the mouse and keyboard

In the constructor: ExampleFrameListener (win, cam, true, true)

In this way, you no longer need to manually write the event capture code capture.

2. register the listener in the constructor

MMouse-> setEventCallback (this );
MKeyboard-> setEventCallback (this );
3. Implement Message Processing functions

// MouseListener
Bool mousemoved (const ois: mouseevent & E)
Bool mousepressed (const ois: mouseevent & E, ois: mousebuttonid ID)
Bool mousereleased (const ois: mouseevent & E, ois: mousebuttonid ID)

// Keylistener
Bool keypressed (const ois: keyevent & E)
Bool keyreleased (const ois: keyevent & E)