Vulkan & Metal both have equivalents, at least for Linux & MacOS. As do most modern consoles. Mobile is an issue, yes. Though curiously sphere impostors were first proposed for use with and implemented using GLES 2.0…
SV_Depth disables early z culling for that draw. But doesn't disable early z culling for subsequent draws. It does disable some z buffer compression that some older / mobile GPUs implement, but that's less of an issue…
Vulkan & Metal both have equivalents, at least for Linux & MacOS. As do most modern consoles. Mobile is an issue, yes. Though curiously sphere impostors were first proposed for use with and implemented using GLES 2.0…
SV_Depth disables early z culling for that draw. But doesn't disable early z culling for subsequent draws. It does disable some z buffer compression that some older / mobile GPUs implement, but that's less of an issue…