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{{ redirect |FBO}}
The '''frame buffer object''' architecture (FBO) is an extension to [[OpenGL]] for doing ''flexible off-screen rendering'', including rendering ''to a texture''. By capturing images that would normally be drawn to the screen, it can be used to implement a large variety of image filters,
and ''post processing effects''. The FBO is analogous to the '''render targets model''' in [[DirectX]]. It is now the main choice in OpenGL because of it's ''superior efficiency, and ease of use''. It has largely superseded the [[pbuffer]], and other methods involving OpenGL context switching, often chosen because it does not.
==Uses==
The FBO has two main uses: The post-processing of rendered images and, Composition between different scenes.
Some examples are:
1. The rendered image is captured and subjected to [[Pixel Shaders]] or other computer manipulation. This allows for
many of todays ''popular computer graphics effects'' to be carried out, including the addition of a blurring or bloom
effect.
2. Can be used to create views of other scenes, for example: a TV in a house. A scene can be rendered through an FBO to a texture, then that
texture can be applied to the surface of a TV.
==Advantages over other methods==
Methods involving the FBO are considered superior because:
* It is easier to setup than most other methods.
* Does not require context switching.
* Is more efficient due resources being shared within the same context.
* Is more flexible because all of depth buffer, stencil buffer, accumulation buffer, etc. can be acquired.
==Architecture==
To use an FBO one simply creates an instance of it. Along with the FBO comes several attachments, one can then
attach these to a chosen receiver; either a [[texture]], or a [[render buffer]].
for example:
* create an FBO
* attach the color buffer to the a texture
* attach the depth buffer to a texture
* render the texture to screen with a pixel shader, dependent on both the Color infomation and depth infomation
=Links=
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