Pixel Shaders, Pixel Shaders

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Pixel shaders can alter the depth of the pixel (for Z-buffering), or output more than one color if multiple render targets are active.

Software tweaks, such as SwiftShader, swShader and 3D-analyze, can sometimes be used as a workaround for games requiring pixel shaders. However, this often renders games unplayable. Forcing such games to run on unsupported cards usually results in unrendered textures and lighting, as well as poor performance. Additionally, many online anti-cheat systems (such as Punkbuster) perform file and memory scans to ensure that game files have not been modified. As a result, those who attempt to play online using such workarounds may be unable to play, and in a worst case scenario, may in fact have their account/CD-key banned.

Source: Wikipedia > Pixel Shader