Shader
También conocido como: crt shader , shader preset , shaders
A shader is a small GPU program that post-processes the emulator's output frame before it reaches your screen. Common emulation shaders simulate CRT scanlines, NTSC composite color bleed, LCD subpixel grids, or curved screen geometry. A good shader chain is opinionated: it changes the look from "pixel-perfect modern LCD" to "what your TV looked like in 1992". libretro's slang shader format is the de-facto standard; presets are shareable across cores and frontends.