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What is the purpose of the new shader compiler flag?

April 26, 2017compiler FLAG purpose shader

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What is the purpose of the new shader compiler flag?

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Beginning with the December 2006 DirectX SDK, the new HLSL compiler that was developed for Direct3D 10 has been enabled for Direct3D 9 targets. The new compiler has no support for ps_1_x targets, and is now the default compiler for all Direct3D HLSL shaders. A flag for backwards compatibility can be used to force ps_1_x targets to compile as ps_2_0 targets.