any one have ideas for post processing for dolphin? or any ways that it can done
Like adding extra shaders? Switch the backend to OpenGL, and under enhancements, there are some like that.
It's already done via the post shaders' files. Some can be configured, some can't. Adding a UI option would be a lot of hassle* for custom post shaders, too, so it's better off this way, considering that it's a small thing.
There are some ideas floating around for improving user configurability of the PP shaders.
I haven't had a chance to implement them.