unrecognized identifier 'SHADOW_COORDS' error in 2017.3

Hello.

Just updated Unity to 2017.3 and I am encountering an "unrecognized identifier 'SHADOW_COORDS'" error when using the UNITY_SHADOW_COORDS(N) define (N is an appropriate number, just to clarify). Any idea on what might be going on here?

Thank you!

 

Yes, Unity changed the macro's around in 2017.3 so that they have a reduced scope in which they are able to be used. You can fix this by including this into your shader code:

Code (CSharp):

1. #ifndef AUTOLIGHT_FIXES_INCLUDED
2. #define AUTOLIGHT_FIXES_INCLUDED
3.  
4. #include "HLSLSupport.cginc"
5. #include "UnityShadowLibrary.cginc"
6.  
7. // Problem 1: SHADOW_COORDS - undefined identifier.
8. // Why: Using SHADOWS_DEPTH without SPOT.
9. // The file AutoLight.cginc only takes into account the case where you use SHADOWS_DEPTH + SPOT (to enable SPOT just add a Spot Light in the scene).
10. // So, if your scene doesn't have a Spot Light, it will skip the SHADOW_COORDS definition and shows the error.
11. // Now, to workaround this you can:
12. // 1. Add a Spot Light to your scene
13. // 2. Use this CGINC to workaround this scase.  Also, you can copy this in your own shader.
14. #if defined (SHADOWS_DEPTH) && !defined (SPOT)
15. #       define SHADOW_COORDS(idx1) unityShadowCoord2 _ShadowCoord : TEXCOORD##idx1;
16. #endif
17.  
18.  
19. // Problem 2: _ShadowCoord - invalid subscript.
20. // Why: nor Shadow screen neighter Shadow Depth or Shadow Cube and trying to use _ShadowCoord attribute.
21. // The file AutoLight.cginc defines SHADOW_COORDS to empty when no one of these options are enabled (SHADOWS_SCREEN, SHADOWS_DEPTH and SHADOWS_CUBE),
22. // So, if you try to call "o._ShadowCoord = ..." it will break because _ShadowCoord isn't an attribute in your structure.
23. // To workaround this you can:
24. // 1. Check if one of those defines actually exists in any place where you have "o._ShadowCoord...".
25. // 2. Use the define SHADOWS_ENABLED from this file to perform the same check.
26. #if defined (SHADOWS_SCREEN) || defined (SHADOWS_DEPTH) || defined (SHADOWS_CUBE)
27. #    define SHADOWS_ENABLED
28. #endif
29.  
30. #endif