Merge pull request #900 from Unity-Technologies/hdrp-msaa-ui

Add MSAA sample count support thru RenderPipelineSettings

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Camera/HDCamera.cs

             if (frameSettings.enableMSAA)
             {
                 // this is already pre-validated to be a valid sample count by InitializeFrameSettings
-                var sampleCount = QualitySettings.antiAliasing;
+                var sampleCount = (int)frameSettings.msaaSampleCount; 
                 tempDesc.msaaSamples = sampleCount;
             }
             else

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/RenderLoopSettings/RenderPipelineSettingsUI.cs

             EditorGUILayout.PropertyField(d.supportSSR, _.GetContent("Support SSR"));
             EditorGUILayout.PropertyField(d.supportSSAO, _.GetContent("Support SSAO"));
             EditorGUILayout.PropertyField(d.supportDBuffer, _.GetContent("Support Decal Buffer"));
-            EditorGUILayout.PropertyField(d.supportMSAA, _.GetContent("Support MSAA"));
+            EditorGUILayout.PropertyField(d.msaaSampleCount, _.GetContent("MSAA Sample Count"));
             EditorGUILayout.PropertyField(d.supportSubsurfaceScattering, _.GetContent("Support Subsurface Scattering"));
             --EditorGUI.indentLevel;
         }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/RenderLoopSettings/SerializedRenderPipelineSettings.cs

         public SerializedProperty supportSSR;
         public SerializedProperty supportSSAO;
         public SerializedProperty supportDBuffer;
-        public SerializedProperty supportMSAA;
+        public SerializedProperty msaaSampleCount;
         public SerializedProperty supportSubsurfaceScattering;
 
         public SerializedGlobalLightLoopSettings lightLoopSettings;
             supportSSR = root.Find((RenderPipelineSettings s) => s.supportSSR);
             supportSSAO = root.Find((RenderPipelineSettings s) => s.supportSSAO);
             supportDBuffer = root.Find((RenderPipelineSettings s) => s.supportDBuffer);
-            supportMSAA = root.Find((RenderPipelineSettings s) => s.supportMSAA);
+            msaaSampleCount = root.Find((RenderPipelineSettings s) => s.msaaSampleCount);
             supportSubsurfaceScattering = root.Find((RenderPipelineSettings s) => s.supportSubsurfaceScattering);
 
             lightLoopSettings = new SerializedGlobalLightLoopSettings(root.Find((RenderPipelineSettings s) => s.lightLoopSettings));

ScriptableRenderPipeline/HDRenderPipeline/HDRP/RenderPipeline/FrameSettings.cs

         public bool enableTransparentObjects = true;
 
         public bool enableMSAA = false;
+        public MSAASamples msaaSampleCount { get; private set; }
 
         public bool enableShadowMask = false;
 
             aggregate.enableOpaqueObjects = srcFrameSettings.enableOpaqueObjects;
             aggregate.enableTransparentObjects = srcFrameSettings.enableTransparentObjects;
 
-            aggregate.enableMSAA = srcFrameSettings.enableMSAA && renderPipelineSettings.supportMSAA;
-            if (QualitySettings.antiAliasing < 1)
-                aggregate.enableMSAA = false;
+            aggregate.enableMSAA = srcFrameSettings.enableMSAA && ((int)renderPipelineSettings.msaaSampleCount > 1);
+            aggregate.msaaSampleCount = aggregate.enableMSAA ? renderPipelineSettings.msaaSampleCount : MSAASamples.None;
+
             aggregate.ConfigureMSAADependentSettings();
 
             aggregate.enableShadowMask = srcFrameSettings.enableShadowMask && renderPipelineSettings.supportShadowMask;

ScriptableRenderPipeline/HDRenderPipeline/HDRP/RenderPipeline/RenderPipelineSettings.cs

 
         // Engine
         public bool supportDBuffer = false;
-        public bool supportMSAA = false;
+        public MSAASamples msaaSampleCount = MSAASamples.None;
 
         public GlobalLightLoopSettings  lightLoopSettings = new GlobalLightLoopSettings();
         public ShadowInitParameters     shadowInitParams = new ShadowInitParameters();