i don't ask shader library !
for me and 3D art the essential one is bump mapping specular for animated models
and somes fixed
caus my main focus is 3D art , not game programming , or put lot of shaders
in a scene.

i already have that shader with 3DGS Or others engines.

For unifying shaders : use TV3D, ogre3D, etc ... they have built in shaders and light managemnt for them...
All is ready to use.

it was just a remark i had in my mind.
no real suggestion

continue the topic , do what you want
i don't mind ... it was just a flying idea

i surely be a bad admin
but some like you for new ideas, optimism well ....