Suggestion: custom shaders

[ChengCat]

This seems to be easy to implement in Tarp, and could be an interesting addition for real-time applications.

LÖVE has this feature.

[mokafolio]

While custom shaders are easy to add in theory, it would create a lot of additional API and implementation complexity that I'd like to avoid for now until the API for the current features is fully chiseled out. I'll put it on the roadmap though!

As of now, you could easily use Tarp to render to a texture and at least add pixel style effects using shaders in a second pass.