mud: (or any other dev around):
Here it is the new version that supports custom shaders.
In-game screenshot using black&white effect
Loader's look. It shows whether a mod has custom shaders or not.
Below the .jar so you may test or whatever:
AmnesiaLoader1.2.zip (Size: 425.71 KB / Downloads: 191)
And this next zip contains the files: (in case you need any)
aml.cfg
colorconv_sepia.tga
posteffect_color_conv_tex_frag.glsl
CustomShader_BlackAndWhite.zip (Size: 1.93 KB / Downloads: 175)
It works pretty much how many said it should work in
this thread 'Black&White screen effect possible?'
Looks for custom shaders, copies to /core/shaders, renames originals, renames back.
Full code is too large and scattered to show it all here, but it's available at GitHub.
I couldn't find any problem, it's pretty decent. :>