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# Ogre::RenderTargetListener Class Reference

A interface class defining a listener which can be used to receive notifications of RenderTarget events. More...

`#include <OgreRenderTargetListener.h>`

List of all members.

## Public Methods

virtual void | preRenderTargetUpdate (const RenderTargetEvent &evt)
| Called just before a RenderTarget is about to be rendered into.
virtual void | postRenderTargetUpdate (const RenderTargetEvent &evt)
| Called just after a RenderTarget has been rendered to.
virtual void | preViewportUpdate (const RenderTargetViewportEvent &evt)
virtual void | postViewportUpdate (const RenderTargetViewportEvent &evt)

## Detailed Description

A interface class defining a listener which can be used to receive notifications of RenderTarget events.

Remarks:
  A 'listener' is an interface designed to be called back when particular events are called. This class defines the interface relating to RenderTarget events. In order to receive notifications of RenderTarget events, you should create a subclass of RenderTargetListener and override the methods for which you would like to customise the resulting processing. You should then call RenderTarget::addListener passing an instance of this class. There is no limit to the number of RenderTarget listeners you can register, allowing you to register multiple listeners for different purposes. RenderTarget events occur before and after the target is updated as a whole, and before and after each viewport on that target is updated. Each RenderTarget holds it's own set of listeners, but you can register the same listener on multiple render targets if you like since the event contains details of the originating RenderTarget.

Definition at line 68 of file OgreRenderTargetListener.h.

## Member Function Documentation

virtual void Ogre::RenderTargetListener::postRenderTargetUpdate | ( | const RenderTargetEvent & | evt | ) | `[virtual]`

Called just after a RenderTarget has been rendered to.

Remarks:
  This event is called just after all the viewports attached to the target in question have been rendered to. You can perform your own manual rendering commands in this event handler if you like, these will be composited with the contents of the target already there (depending on the material settings you use etc).

Definition at line 99 of file OgreRenderTargetListener.h.

virtual void Ogre::RenderTargetListener::postViewportUpdate | ( | const RenderTargetViewportEvent & | evt | ) | `[virtual]`

| Definition at line 114 of file OgreRenderTargetListener.h.

virtual void Ogre::RenderTargetListener::preRenderTargetUpdate | ( | const RenderTargetEvent & | evt | ) | `[virtual]`

Called just before a RenderTarget is about to be rendered into.

Remarks:
  This event is raised just before any of the viewports on the target are rendered to. You can perform manual rendering operations here if you want, but please note that if the Viewport objects attached to this target are set up to clear the background, you will lose whatever you render. If you want some kind of backdrop in this event you should turn off background clearing off on the viewports, and either clear the viewports yourself in this event handler before doing your rendering or just render over the top if you don't need to.

Definition at line 90 of file OgreRenderTargetListener.h.

virtual void Ogre::RenderTargetListener::preViewportUpdate | ( | const RenderTargetViewportEvent & | evt | ) | `[virtual]`

| Definition at line 107 of file OgreRenderTargetListener.h.

The documentation for this class was generated from the following file:

- OgreRenderTargetListener.h

Copyright © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:51:30 2004