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It seems an obvious question to ask at the beginning of an HLSL and shader book; what exactly is a shader? It’s a small program or algorithm written explicitly to run on a computer Graphics Processing Unit (GPU). It provides a way for developers to extend the rendering capabilities of the GPU. Any program that works closely with graphics will benefit from using shaders. The video game industry spins off custom shaders by the thousands, they are as vital to game projects as business entity classes are to line of business applications. Nothing prohibits business programmers from experimenting with shaders in their line of business (LOB) applications,. | A Comprehensive Guide to Creating HLSL Pixel Shaders for WPF and Silverlight Applications HL5L and Pixel Shaders for XAML Developers O REILLY Walt Ritscher O Reilly Media Inc. 4 5 2012 1 Shader 101 It seems an obvious question to ask at the beginning of an HLSL and shader book what exactly is a shader It s a small program or algorithm written explicitly to run on a computer Graphics Processing Unit GPU . It provides a way for developers to extend the rendering capabilities of the GPU. Any program that works closely with graphics will benefit from using shaders. The video game industry spins off custom shaders by the thousands they are as vital to game projects as business entity classes are to line of business applications. Nothing prohibits business programmers from experimenting with shaders in their line of business LOB applications in fact recent trends in user interface UI design and information visualization cry out for shader use. Because shaders run at the kernel level of the GPU they are automatically parallelized by the GPU hardware and are extremely fast at manipulating graphic output. Typically the GPU can process shaders several orders of magnitude faster than if the shader code is run on a CPU. Why XAML developers should learn HLSL If you are a XAML developer I ll wager you ve heard about pixel shaders. In fact you may be using some of these effects in your application already. WPF introduced the DropShadowEffect and BlurEffect in .NET 3.5 SP1 and both of these classes take advantage of pixel shaders. Silverlight added pixel shaders in Silverlight 3. The Windows Phone team disappointed developers by dropping support for shaders before the final release of their hardware. Microsoft had good reason to ditch phone shaders as they caused a significant drag on performance but their loss is still lamentable To make up for that setback the Silverlight 5 release includes support for XNA models and shaders. This is awesome news as it means that you can mix XNA
