Tutorial on how to implement the shaders available in the Gameplay video/Trailer section to the right

Over the past few weeks, I have been learning to make shaders for OpenGL 1.2 to use in Easy FPS Editor made by JessicoChan - itch.io 

"

Easy FPS Editor is a game construction tool that provides a set of editors complete with a map editor and a custom-made engine (made using SFML), created exclusively for that! All are integrated into a single GUI. It was made as simple and easy to use as possible.

Graphically and in gameplay wise games you can create will be similar to Doom or its clones with modern additions of pixel lighting and (customizable through shader editing) shader post effects.

"

The shader system is a bit limited but the shaders you can download here can give you some different looks to your game helping to create a new look and feel. 

The following shaders have been made with plans to make more down the track. 

• PSX-style pixel shader (Basic pixelation effect)
• PSX-style pixel shader V2 (pixelation, random dither effect, color clamping and scanlines for a more accurate feel)

• Toon Shader (Calculated by contrast not depth)
• Soft Film Noir 
• Harsh Film Noir
• Sepia