The latest Photoshop on Linux is quite attainable; I have CC running smoothly via VMWare Worksation 12 / Windows 7 (new versions of VMWare have DirectX/OpenGL and let you allocate GPU memory)
... but unfortunately that combines 2 proprietary solutions so guess it doesn't exactly fit your criteria.
... but unfortunately that combines 2 proprietary solutions so guess it doesn't exactly fit your criteria.