Post-Processing Effects (Part 1)

Advancements in graphics hardware now allow full-screen effects to be performed on a rendered image, to create a wide variety of special effects. When used properly, post-processing effects can give a cinematic quality to computer graphics.
Leadwerks Engine features a low-level buffer and shader system which allows rendering of any kind of post-processing effect. Although this requires a deeper understanding of shaders than a simple turn bloom on system, it allows far greater flexibility. New post-processing effects can be added without having to modify the engine source code.
To render post-processing effects, were going to use an additional buffer. Well first render the scene to the gbuffer, then render lighting onto the postbuffer. In the last step, well draw the postbuffer color texture onto the back buffer, with post-processing effects applied, as shown in the diagram below. The first two effects we discuss will only use draw settings, while more advanced effects will use a postfilter shader.

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really nice video.