1. Overview Reflex PE Shaders (commonly referred to as Reflex Shaders or Reflex PixelEngine ) is a high-performance, real-time post-processing and effects shader pack designed primarily for ReShade and OpenGL-based emulators (e.g., Dolphin, PPSSPP, RetroArch). It is widely used in the emulation and PC gaming communities to enhance visual quality beyond native game rendering.