Shader error in 'Hidden/Universal/CoreBlit': invalid subscript 'positionCS' at

im trying to build a urp project for webgl but always see these errors

Shader error in 'Hidden/Universal/CoreBlit': invalid subscript 'positionCS' at Library/PackageCache/com.unity.render-pipelines.core@12.1.6/Runtime/Utilities/Blit.hlsl(92) (on gles)

Shader error in 'Hidden/kMotion/CameraMotionVectors': SV_VertexID semantic is not supported on GLES 2.0 at line 11 (on gles)

Compiling Subshader: 0, Pass: , Vertex program with <no keywords>
Platform defines: SHADER_API_DESKTOP UNITY_COLORSPACE_GAMMA UNITY_ENABLE_DETAIL_NORMALMAP UNITY_ENABLE_REFLECTION_BUFFERS UNITY_LIGHTMAP_RGBM_ENCODING UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BLENDING UNITY_SPECCUBE_BOX_PROJECTION UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS
Disabled keywords: SHADER_API_GLES30 UNITY_ASTC_NORMALMAP_ENCODING UNITY_ENABLE_NATIVE_SHADOW_LOOKUPS UNITY_FRAMEBUFFER_FETCH_AVAILABLE UNITY_HALF_PRECISION_FRAGMENT_SHADER_REGISTERS UNITY_HARDWARE_TIER1 UNITY_HARDWARE_TIER2 UNITY_HARDWARE_TIER3 UNITY_LIGHTMAP_DLDR_ENCODING UNITY_LIGHTMAP_FULL_HDR UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_METAL_SHADOWS_USE_POINT_FILTERING UNITY_NO_DXT5nm UNITY_NO_FULL_STANDARD_SHADER UNITY_NO_SCREENSPACE_SHADOWS UNITY_PBS_USE_BRDF2 UNITY_PBS_USE_BRDF3 UNITY_PRETRANSFORM_TO_DISPLAY_ORIENTATION UNITY_UNIFIED_SHADER_PRECISION_MODEL UNITY_VIRTUAL_TEXTURING

thoughts?

 

I'm currently experiencing the same issue. Some digging came up with this PR getting merged.
https://github.com/Unity-Technologies/Graphics/pull/6970

But I guess it's not in our version yet.

 

Same issue with unity 2021.2.18 at Android build.

 

Bump. Seeing this in the new 2021.3.0f1 LTS release building for WebGL. I'm also getting a shader-related warning following the two errors:

Shader warning in 'Hidden/Universal Render Pipeline/CopyDepth': implicit truncation of vector type at ~/Library/PackageCache/com.unity.render-pipelines.universal@12.1.6/Shaders/Utils/CopyDepthPass.hlsl(104) (on gles)

 

This definitely seems like an unintentional oversight. Removing OpenGLES 2.0 from the graphics API list will likely work around this.

You can do this in the Player Settings, uncheck "Auto Graphics API" then remove it from the list that pops up.

 

Having the same issue (2021.3.0f1 LTS, WebGL, URP)

 

Can confirm this works around the issue. For others that may want to do this, note that OpenGLES 2.0 is listed as WebGL 1 (Deprecated) in 2021.3.0f1.

 

I can also confirm that removing OpenGLES 2.0 will solve the issue. But for me it was necassary to use the "Clean Build" option to get rid of the build-error.

 

Can confirm too.
Note: OpenGLES 2.0/WebGL 1 was already removed in my project but I had to add and remove it again to make this work.

 

Bug appears in 2021.3.1f1 URP but only when doing a "Build And Run".
Slightly problematic as we have to support ogengles2.0 and produce app bundles. Meaning we're forced to upload the builds to test them.
Embedding the packages and applying the edits from the PR seem to fix the issue.

 

This worked for me, thank you!

 

@AltkeyMolling could you give some more details regarding what packages need to be embedded and how.
Also, while I made the changes described in the Github link you shared, they all get reverted back to original buggy code the moment I go back to Unity Editor window. Can you guide me as to how did you resolve it?

 

1. The packages modified in the PR. So com.unity.render-pipelines.core and com.unity.render-pipelines.universal
2. Some documentation on how to embed packages
   1. From unity https://docs.unity3d.com/Manual/upm-embed.html
   2. From a nice guy on the forums, not tested https://forum.unity.com/threads/easily-embed-packages-to-your-project-with-this-extension.766733/

Embedding the packages will prevent them from reverting, as the package manager will revalidate and restore modified scripts in non-embedded packages.

 

Unity 2021.3.0f1 with android here.
Got it sorted by going in Edit -> Rendering -> Generate shaders includes

 

Hello, I tried the PR link you mentioned, but they led me to Frogbuz something that only allow to access through a company email or something that I cannot download the package. What should I do? can I just update Unity and things will be sorted out? this bug haunted me for months. Thanks

 

I tried every suggested solution here (on Unity 2022.3.3) and the only workaround I found is to Build and then deploy manually... Totally bananas...

 

I finally solved it. I was getting loads of these URP 'Hidden/..." shader errors when trying to build and run.

1. I had to go to my "Project Settings>Player" and then go to the "Graphics APIs" section and remove OpenGLES2 from the list.

2. Right-click on the 'Universal RP' package in the packages section of your asset browser and (wait DO NOT hit "Re-import all') Just hit Reimport.

Those two steps solved it for me. All credit goes to this Japanese website where I found this info.
https://zenn.dev/r_ngtm/articles/urp14-07-shader-bug

 

This worked! Thanks!