Updating LWRP to work with the new standalone subsystems.

Assets/LWRPSupport/ARCoreBackgroundLWRP.shader

             void main()
             {
 #ifdef SHADER_API_GLES3
-                gl_FragColor = texture(_MainTex, textureCoord);
+                gl_FragColor = vec4(texture(_MainTex, textureCoord).xyz, 1);
 #endif
             }
 

Assets/LWRPSupport/LWRPBackgroundRendererAsset.cs

-
+using UnityEngine.XR.ARFoundation;
 
 namespace UnityEngine.XR.ARFoundation
 {
         [SerializeField]
         Material[] m_MaterialsUsed;
 
+        [SerializeField]
+        ARCameraManager m_CameraManager;
+
-        
+
         public override ARFoundationBackgroundRenderer CreateARBackgroundRenderer()
         {
             return useRenderPipeline ? new LWRPBackgroundRenderer() : new ARFoundationBackgroundRenderer();
         {
+            m_CameraManager = cameraGameObject.GetComponent<ARCameraManager>();
+            Debug.Assert(m_CameraManager != null, "camera manager must be non-null");
+
             if (useRenderPipeline)
             {
                 var lwrpBeforeCameraRender = cameraGameObject.GetComponent<LWRPBeforeCameraRender>();
 
         public override Material CreateCustomMaterial()
         {
-            var cameraSubsystem = ARSubsystemManager.cameraSubsystem;
-            if (cameraSubsystem == null)
+            if (m_CameraManager == null)
+            {
+                Debug.Log("camera manager is null");
+            }
-            var shaderName = "";
-            if (!cameraSubsystem.TryGetShaderName(ref shaderName))
-                return null;
+            var shaderName = m_CameraManager.shaderName + "LWRP";
+            Debug.LogFormat("Creating material for shader '{0}'", shaderName);
-            shaderName = shaderName + "LWRP";
-            
             var shader = Shader.Find(shaderName);
             if (shader == null)
             {
-                    cameraSubsystem.SubsystemDescriptor.id));
+                    m_CameraManager.descriptor.id));
-    
-}    
+
+}

Assets/LWRPSupport/Unity.XR.ARFoundation.LWRPSupport.asmdef

     "name": "Unity.XR.ARFoundation.LWRPSupport",
     "references": [
         "Unity.XR.ARFoundation",
+        "Unity.XR.ARSubsystems",
         "Unity.RenderPipelines.Core.Runtime",
         "Unity.RenderPipelines.Lightweight.Runtime"
     ],
     "precompiledReferences": [],
     "autoReferenced": true,
     "defineConstraints": []
-}
+}

Assets/Prefabs/LightweightRP.asset

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+  m_MSAA: 1
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-  m_ShadowAtlasResolution: 2048
-  m_ShadowNearPlaneOffset: 2
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+  m_LocalShadowsSupported: 0
+  m_LocalShadowsAtlasResolution: 256
+  m_MaxPixelLights: 4
+  m_ShadowAtlasResolution: 2048
+  m_ShaderVariantLogLevel: 0

Assets/Scenes/SampleLWRPScene.unity

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   m_CustomReflection: {fileID: 0}
   m_Sun: {fileID: 0}
-  m_IndirectSpecularColor: {r: 0.44657898, g: 0.496413, b: 0.5748175, a: 1}
+  m_IndirectSpecularColor: {r: 0.44657898, g: 0.49641287, b: 0.5748173, a: 1}
   m_UseRadianceAmbientProbe: 0
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+  m_DetectionMode: -1
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ProjectSettings/EditorBuildSettings.asset

     path: Assets/Scenes/Plane Detection/TogglePlaneDetection.unity
     guid: eb4bbb3a5e81acc41a903b1c5f1c827b
   - enabled: 0
+    path: Assets/Scenes/SampleLWRPScene.unity
+    guid: f3beb74fe75ac4a0e9ed3d2e9950bba8
+  - enabled: 0
     path: Assets/Scenes/Scale.unity
     guid: 13ac91f677dc22f4ca320ef8ae727b68
   - enabled: 0