The pixel local storage
frame fetch
You can make a pass soft particle / deferred lighting / soft edge water
programble blending
In the middle of something on the tile
https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_shader_pixel_local_storage.txt
Mrt or do not pass both the province twice the bandwidth of store / load
https://www.arm.com/files/pdf/9_2015ATF_Korea_UnrealEngine.pdf