I want the extension for voxel GI personally. onsolight knows more about emulators than me, but I did come across this discussion with Gregory, the dev of pcsx2 via the issue requesting this extension at khronos github:
found here:
https://www.bountysource.com/issues/29282999-dx12-and-vulkan-backends
they discuss it at length. some excerpts:
"On Vulkan topic. Yes Vulkan is nice but it misses modern feature, called either rov or shader interlock. This feature is a requirement to emulate some gsdx effect. Without it, the API is just useless for us ! "
"As linked above, ARB_fragment_shader_interlock is everywhere be it in its official form or its NV_fragment_shader_interlock/INTEL_fragment_shader_ordering predecessors.
There's no "if" wonder (performance aside, but we all know who's the felon there...No, even if win-amd was half the market the manpower required to reinvent the[ir broken] wheel would still be unjustified. Let alone if the fix/alternative for the time being has hard downsides that would affect every single body."
