External textures only work in pixel shaders

External textures currently only support pixel shaders, presumably because some platforms, such as Android only have pixel shader support. On other platforms this causes a regression though: For example, setups using media textures in vertex or domain shaders no longer work. We should implement support on the other platforms.

This has come up several times on AnswerHub/UDN now.

n/a

Video in Light Function no longer working

MediaTexture doesn't work with RGBtoHSV or world displacement

MediaTexture doesn't work with RGBtoHSV or world displacement

Video in Light Function no longer working