[Bf-viewport] OCIO update

[Mike Erwin]

Clément FOUCAULT <foucault.clem at gmail.com> wrote:

> I've looked into OCIO sources and the GPU_LANGUAGE_GLSL_1_3 is only used
> in one case to write a function with the "in" qualifier.
> Most of the time it's just used to check if it's GLSL code.
>
> https://github.com/imageworks/OpenColorIO/blob/
> a557a85454ee1ffa8cb66f8a96238e079c452f08/src/core/Processor.cpp#L244
>
> So I'm pretty positive it means GLSL >= 1.3
>
>
That's good news! If we only have to change files in our library interface,
that saves trouble of making an upstream OCIO change.
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