High Quality Content by WIKIPEDIA articles! A shader is essentially a computer program executed on a special environment. This article specifically covers realtime shaders which are shaders meant to execute on consumer-level GPUs. Although shaders were introduced for graphics related tasks which still hold a major part of their applications, shaders can also be used for more generic computation, just as generic programs can be used to compute arbitrary data. As the computational power of GPUs continue to rise faster than conventional CPUs, the interest in shader programming attracts more and more attention. This requires rethinking algorithms or problems to fit the stream processing paradigm. The goal of this article is to provide a look at the most important concepts concerning shaders in most important APIs such as OpenGL and Direct3D. The reader is assumed to be proficient with 3D graphics, a graphics API and fourth generation shading pipelines. Shaders alone control a large part...

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