This shader is almost perfect for older games (nes / snes / smd). Is it possible to remove the curvature of the screen? Unfortunately, this shader has no settings at all.
github.com/Matsilagi/reshade-shadertoy-shaders
Idk if you still monitor this post but if you look down you'll see the code: "uv = curve( uv );" Remove that. you can even go another step further in removing the curve function.