It is important to note that Citra shaders are Post-Processing effects. They apply to the texture of the game screen, not the window itself.
float scanline = 0.85 + 0.15 * sin(gl_FragCoord.y * 0.5);
color.rgb *= scanline;
Designed for upscaling animated films, Anime4K works wonders on cel-shaded 3DS games. citra shader
Originally developed by AMD for desktop games, the FidelityFX shader is widely considered the "king" of Citra graphics. It is important to note that Citra shaders