Complex Renderer

This program draws a user-defined function from complex plane to RGBA color. Currently, compiled program draws Mandelbrot set, but if you want to draw another function, you need to inherit it from 'Renderer' class in sources, pass it to 'Window' and recompile project.
Including 4 versions. The first one was written with C++ and uses CPU 128-bit double. The second does the same, but was written with D language and Derelict3. The third uses GPU (GLSL shaders) to draw Mandelbrot set. It is extremely fast, but uses only 32-bit float. And finally, the fourth works on CPU, but uses arbitrary precision (OpenMP), so it hasn't limit for depth (except rendering time).