Shader Error X8000 unity 6.1

[dooly123]

Shader error in 'Hidden/VolumetricFog': Program 'Frag', error X8000: D3D11 Internal Compiler Error: Invalid Bytecode: source register relative index temp register component 1 in r7 uninitialized. Opcode #28 (count is 1-based) at line 19 (on d3d11)

Compiling Subshader: 0, Pass: VolumetricFogRender, Fragment program with PROBE_VOLUMES_L1 STEREO_INSTANCING_ON _ADDITIONAL_LIGHT_SHADOWS _FORWARD_PLUS _MAIN_LIGHT_CONTRIBUTION_DISABLED
Platform defines: SHADER_API_DESKTOP UNITY_ENABLE_DETAIL_NORMALMAP UNITY_ENABLE_REFLECTION_BUFFERS UNITY_LIGHTMAP_FULL_HDR UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_PBS_USE_BRDF1 UNITY_PLATFORM_SUPPORTS_DEPTH_FETCH UNITY_SPECCUBE_BLENDING UNITY_SPECCUBE_BOX_PROJECTION UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS
Disabled keywords: PROBE_VOLUMES_L2 SHADER_API_GLES30 UNITY_ASTC_NORMALMAP_ENCODING UNITY_COLORSPACE_GAMMA UNITY_FRAMEBUFFER_FETCH_AVAILABLE UNITY_HARDWARE_TIER1 UNITY_HARDWARE_TIER2 UNITY_HARDWARE_TIER3 UNITY_LIGHTMAP_DLDR_ENCODING UNITY_LIGHTMAP_RGBM_ENCODING UNITY_METAL_SHADOWS_USE_POINT_FILTERING UNITY_NO_DXT5nm 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 _ADDITIONAL_LIGHTS _ADDITIONAL_LIGHTS_CONTRIBUTION_DISABLED _APV_CONTRIBUTION_ENABLED _LIGHT_COOKIES _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN

warning : Shader warning in 'Hidden/VolumetricFog': _FORWARD_PLUS shader keyword has been deprecated. Please update your shaders to use _CLUSTER_LIGHT_LOOP shader keyword instead, otherwise shader compilation times may be negatively affected. at /Users/doola/OneDrive/Documents/Github/Basis Demo/BasisDemo/Basis/Library/PackageCache/com.unity.render-pipelines.universal@150a31bd1157/ShaderLibrary/ForwardPlusKeyword.deprecated.hlsl(12)

repo: doolys branch -> https://github.com/BasisVR/Basis then add the volumetric package if it does not have it and proceed to build. The error does not happen all the time, still tracking down what can be done to make it go away.

the error above has siblings all with the same issue. Also included the warning about the keyword being deprecated.

will be attempting to fix the warning and errors myself, just wanted to make an issue about it.

[dooly123]

was able to nail it down to here

[CristianQiu]

Hi, the warning should be harmless, _FORWARD_PLUS keyword was deprecated (replaced by _CLUSTER_LIGHT_LOOP in 6000.1.0 +) but Unity defines it in a deprecated file that is still included.

If you want to give it a try and let me know, I have a branch where I got rid of all support below Unity 6000.1, including the non-rendergraph path and some shader fallbacks for platforms that do not support the texture gather instruction (mainly intended for WegGL).

This is the branch . It also has the usage of that keyword updated already and keeps the same exact functionality.

I have been using Unity 6000.1 (6000.1.5f1 right now) since it came out of beta and I have never had any issue, but I am using DX12.

[CristianQiu]

Hey, been digging into the Shadows.hlsl file from 6000.1, since the function you commented (from VolumetricShadows.hlsl) was copied from there some versions ago.

Could you also try replacing 'float' by 'const int' here? (VolumetricShadows.hlsl from this package):

It's the only meaningful thing that does not match, just giving some ideas.

[dooly123]

Sadly, that did not resolve the issue.

[dooly123]

https://github.com/BasisVR/Basis/tree/Volumetric-Light-validation-for-CristianQiu I have included a branch that replicates the issue, the version of volumetric lighting has the light cluster & int change.

thx for getting back to me on this, appreciate it

[dooly123]

Also, on a side note would love to show you what I'm using the volumetric for and invite you to one of our load tests / tests if you would like to see it in action. my contact details can be found under contact here : https://github.com/BasisVR/Basis

[CristianQiu]

I downloaded and tested the branch you linked, tried multiple things like copying my exact URP settings or directly using Unity's original function there as well as making other changes, but I can't figure out what's messing with it, I ran out of ideas. I have tried an empty project (6.1, dx11) and it does not happen, seems to be an issue related to your project.

The thing is that it seems to finish the build (Windows) successfully, and it also appears to work ok, despite the shader compilation error. As far I saw, in the SunDown scene you are using it for APV only.

Perhaps it is something related to XR, which I have limited experience with and I have not thoroughly tested myself.
In any case, if you find anything let me know.

Also, thanks for the invite, but I'm too out from the VR scenario. I get dizzy extremely easy and don't even own any VR equipment myself :( . But I'll check out your progress for sure, the scene I tested looked great :)

[dooly123]

You are always more than welcome to join on desktop. For now, we have just disabled the function for attenuation. Thank you for looking into it.

[dooly123]

Just wanted to give an update on this, I believe the issue will only show its head aswell when VR variants have been compiled. (as you mentioned, being the case, just wanted to confirm it)

[CristianQiu]

Thanks for the info, I don't have the time to test it now but I'll try to have a look again before the next meaningful release.