> There are software implementations of OpenGL but they tend to be rather mediocre at best for performance. This is because OpenGL is made so that you need to

> There are software implementations of OpenGL but they tend to be rather mediocre at best for performance. This is because OpenGL is made so that you need to run a program to calculate color of every pixel, even if all you want is to copy a glyph. Obviously it will be slow unless you have hundreds of core running in parallel. Software implementations should either learn to convert shaders to non-parallel optimized loops, or something other than OpenGL should be chosen as a basis for rendering GUI.