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                                            k0091601

Still Uses Phong Shading and Not GGX

That's intentional, Phong shading is much cheaper than GGX. GGX would not be optimal for VR. However it wouldn't take much to switch from Phong to GGXto test for your...

Still Uses Phong Shading and Not GGX

shaders/vr_lighting ComputeDiffuseAndSpecularTerms is the function your looking for, It computes both diffuse and specular terms.