How unity statistic global keyword? Maximum number (256) of shader in unity 2018.

Hey guys !

[ Maximum number (256) of shader ].

My project have so much shader keyword that engine always show this log, and it cause some shader not be complied.

Could some one explain how the way that unity engine statistic those keyword ?

Is that Even same keyword in different shader will be count mutli keyword or just one ?

for example
Example 1:
Shader A has keyword __keywordA
Shader B has keyword __keywordB

Example 2:
ShaderPass A has keyword __keywordA
ShaderPass B has keyword __keywordB

Example 3:
SubShader A has keyword __keywordA
SubShader B has keyword __keywordB

Question1: Does Engine count it one or two ?
Question2: How many unity always will be complied buitld-in keyword ?

I know unity 2019 have local_keyword feather, Unfortunately , my project stuck at 2018 can't upgrade engine.

 

thanks!

 

Here is the result that i found.

1.Unity 2018 maybe have 80 Keyword build-in in the Engine side, found it by make a new empty project, remove all include shader. and make 256 keyword shader to complie and found out the result.
2.Keyword in material and shader will be counted in global keyword.
3.so if you project have 256 max shader keyword probem . scan your project material and shader, reduce the keyword to about 150 .it should be safe.