Using #if platform defines in shaders?

Is it possible to use platform defines in a shader?
For example:

#if UNITY_EDITOR
Use surface shader code...

#if UNITY_IPHONE
Use vertex lit shader code...

etc...

Or are those defines available only in scripting and not shaderLab? If yes, is there a similar way to achieve this in a shader?

Thanks!
Stephane

 

It would also be extremely useful for version migration and code sharing if we had access to Unity version defines like in c#. For instance:

#if UNITY_3_5
// use new shader features
#else
// use fallback
#endif

 

That's already possible: http://unity3d.com/support/documentation/Manual/Platform Dependent Compilation.html

 

So I tried using #if UNITY_EDITOR and #if UNITY_IPHONE defines in my shader, and although it didn't throw any errors, it also didn't work. Is there any way of implementing platform specific #defines in shaders?

Stephane

 

you can make your own custom definitions and pass them to your shader via the below commands:
Shader.EnableKeyword("MYDEFINE")
Shader.DisableKeyword

and use them in your shader as;
#if defined(MYDEFINE)
...etc
#endif

look at the water3 shader and scripts.

 

Awesome, thanks for the help, i knew there was a way, I just didn't look in the right places
Thanks again Aubergine!

 

So i looked at the water3 shader and script, and tried to implement the keywords as it does, but couldn't get it to work with my shader. The question I have is when doing:

Code (csharp):

1. Shader.EnableKeyword("MYDEFINE")

does "Shader" return the shader used by the material of the gameObject this script is attached to? What if i don't attach the script to any gameObject with a shader(like a parent object)? I have tried that, by assigning the shader I want to change to a public property in the inspector:

Code (csharp):

1. public Shader myShader;    // Assigned shader in inspector, not null
2.  
3. void Start()
4. {
5.     // The problem is that "EnableKeyword" isn't available anymore:
6.     myShader.(NO EnableKeyword)
7.  
8.     // But if using Shader, it is available:
9.     Shader.EnableKeyword("myDefine");
10. }

Any ideas?
Thanks for your time!
Stephane

PS: Maybe I should point out that I am NOT using Unity PRO, I am using Unity IPHONE basic (ver. 3.5)

 

Although an old thread this comes up in the top couple results on a google search for platform defines in shaders.

Unity now has Platform Defines using macros in shaders

 

Though it's handy to note there still is no UNITY_EDITOR equivalent available to shaders.

 

This is nuts, still not seeing a UNITY_EDITOR equivalent in shaders. Such a simple thing but would be really helpful

 

I think there was discussion about this recently, Unity's added the tech for conditionally compiling for any Unity version from inside the shader now with defines. I can't find the thread but it exists to help shader authors, asset store etc. This could very easily be made to include editor detection, so I recommend telling them while it's hot

 

This one?

https://forum.unity.com/threads/package-requirements-in-shaderlab.1108832/

Thought it was package only which doesn't solve targeting editor only.

As for requesting features, I doubt Unity will take my suggestions for a while since I'm raising such a stink in other areas Also a bit sick of trying to talk to them to be honest

 

@aleksandrk Just wondering if this is still in the backlog a couple years later?