Changes

Shader Presets are combinations of one or more shaders. The Shader Chain which is a stack of shader passes each one pointing to a specific shader file.<ref>[https://docs.libretro.com/guides/shaders/#shader-presets Libretro docs: Shaders]</ref>There is a misconception about shaders; Generally, you really can't copy+paste shaders between two different programs even if they support same extension like .glsl, not unless they know how their shaders are structured and what kind of input they need and output they give.