[Core] Fix XR support in CoreUtils.Drawfullscreen #6287

Author: Antoine Lelievre

com.unity.render-pipelines.core/CHANGELOG.md

@@ -6,8 +6,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [12.1.3] - 2021-11-17
 
-Version Updated
-The version number for this package has increased due to a version update of a related graphics package.
+### Fixed
+- Fixed XR support in CoreUtils.DrawFullscreen function.
 
 ## [12.1.2] - 2021-10-22
 

com.unity.render-pipelines.core/Runtime/Utilities/CoreUtils.cs

@@ -795,7 +795,7 @@ public static void DrawFullScreen(CommandBuffer commandBuffer, Material material
             RenderTargetIdentifier colorBuffer,
             MaterialPropertyBlock properties = null, int shaderPassId = 0)
         {
-            commandBuffer.SetRenderTarget(colorBuffer);
+            commandBuffer.SetRenderTarget(colorBuffer, 0, CubemapFace.Unknown, -1);
             commandBuffer.DrawProcedural(Matrix4x4.identity, material, shaderPassId, MeshTopology.Triangles, 3, 1, properties);
         }