Before mainline Dolphin had stable DX12, Ishiiruka was playing with it. More importantly, this was the build that enabled . Using LibOVR, you could play F-Zero GX or Mario Kart: Double Dash in true 3D VR on an Oculus Rift. It was janky, nauseating, and absolutely incredible.
Ishiiruka pioneered features like Asynchronous Shader Compilation (to reduce stuttering) long before they were integrated into mainline Dolphin. Advanced Graphical Enhancements ishiiruka dolphin