[Backport 7.x.x] Updated raytracing async compute warning. (#304)

* Made more explicit the warning about raytracing and asynchronous compute. Also fixed the condition in which it appears.

* Update changelog

Co-authored-by: sebastienlagarde <sebastien@unity3d.com>

Author: JulienIgnace-Unity

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -63,6 +63,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed the indirect diffuse texture not being ignored when it should (ray tracing disabled).
 - Fixed depth prepass and postpass being disabled after changing the shader in the material UI.
 - Fixed a performance issue with stochastic ray traced area shadows.
+- Made more explicit the warning about raytracing and asynchronous compute. Also fixed the condition in which it appears.
 
 ### Changed
 - Rejecting history for ray traced reflections based on a threshold evaluated on the neighborhood of the sampled history.

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/Settings/FrameSettingsUI.Drawers.cs

@@ -105,8 +105,11 @@ internal static CED.IDrawer InspectorInnerbox(bool withOverride = true) => CED.G
                     RenderPipelineSettings hdrpSettings = GetHDRPAssetFor(owner).currentPlatformRenderPipelineSettings;
                     if (hdrpSettings.supportRayTracing)
                     {
-                        if (serialized.IsEnabled(FrameSettingsField.AsyncCompute) ?? false)
-                            EditorGUILayout.HelpBox("With Raytracing, the Asynchronous Execution will be forced to false", MessageType.Warning);
+                        bool rtEffectUseAsync = (serialized.IsEnabled(FrameSettingsField.SSRAsync) ?? false) || (serialized.IsEnabled(FrameSettingsField.SSAOAsync) ?? false)
+                        //|| (serialized.IsEnabled(FrameSettingsField.ContactShadowsAsync) ?? false) // Contact shadow async is not visible in the UI for now and defaults to true.
+                        ;
+                        if (rtEffectUseAsync)
+                            EditorGUILayout.HelpBox("Asynchronous execution of Raytracing effects is not supported. Asynchronous Execution will be forced to false for them", MessageType.Warning);
                     }
                 }));