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UE4 uses HLSL or GLSL for its own shaders?

What UE4 uses for its own shaders like SKyLighting.usf etc?

I watched a presentation it uses HLSL but uses a HLSL cross compiler for openGL platforms.
AM I RIGHT??

The .usf files are plain hlsl files; we use a cross-compiler to convert hlsl for glsl & metal shaders.