PLS做soft particle

这个pixel local storage

frame fetch

可以一个pass做出soft particle/deferred lighting/soft edge water

programble blending

中间的东西在tile上

https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_shader_pixel_local_storage.txt

就不用mrt或者俩pass了 省两次带宽 store/load

https://www.arm.com/files/pdf/9_2015ATF_Korea_UnrealEngine.pdf