RenderToy is tool for quickly prototyping GPU-based rendering pipelines and shaders. I'm mostly making it for myself as a replacement for ATi's RenderMonkey.
As of v0.1 compute-based render passes can be chained together via a node graph to form an image processing pipeline. RenderToy currently uses OpenGL 4, with plans to move to Vulkan at some point.
There is no built-in text editor. Instead, RenderToy is meant to be used side-by-side with the text editor of your choice. A plugin for Sublime Text 3 is provided which provides in-line reporting of shader build errors.
The current version is Windows-only. The code is mostly OS-agnostic, so porting should not be too difficult.
