There are incomplete shaders included which are non-functional and should be removed.

[skeletonbow]

Shaderfilter 1.21 comes with a handful of shaders which appear to have had development started on them but never finished so they are completely non-functional, which could confuse users trying to get them to work. Many months ago someone was trying to port all of the shaders to GLSL to get them working on Mac without being very experienced in such matters and a stumbling block they fell upon was some of these non-functional shaders.

These shaders should be completed or more likely just completely removed as they're non-functional. The software should only ship with working code. Development should occur in one branch and get merged to master only when it is functional and ready to be included.

This may not be a complete list but some of the shaders which are incomplete and non-functional include:

• darken.shader

I'll complete the list as I go through them at a later date.

[skeletonbow]

Removed darken.shader in SB-2.0-dev branch

[skeletonbow]

aspect_ratio.shader might be salvageable, otherwise remove it.