Is it possible to use different blend modes for different pixels?

Unity Engine
, ,
1

I am currently working on a shader that inverts the colors of what is behind it, but I need it to also support transparency. I got help about the color inversion and it works nicely, bug now any pixel that has its alpha set to 0 will be white instead of transparent. This means i can’t use PNG’s with transparency as textures.

I am thinking about using two blend modes, and decide in the fragment shader which one to use. Something like:

if (baseTex.a == 0)
                {
                    Blend  SrcAlpha OneMinusSrcAlpha  //normal transparency blending
                }
                else
                {
                    Blend OneMinusDstColor OneMinusSrcAlpha    //invert color blending
                }
2

No.