Universal/always normalize normal (#2788)

* Always normalize the normal in pixel shader.

* Update change log.

* Update mobile images to match desktop.

* Another update on mobile ref pics.

There's a mobile optimization for clear coat which is why desktop ref pics aren't compatible.

* Update Android ref pics.

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

@@ -41,6 +41,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Autodesk Interactive Shader Graph files and folders containing them were renamed. The new file paths do not have spaces.
 - Changed shader keywords of main light shadow from toggling to enumerating.
 - Moved `ForwardRendererData.postProcessData` into `UniversalRenderPipelineAsset.postProcessData` and made it optional. Builds do not include post-processing shaders and textures when `UniversalRenderPipelineAsset.postProcessData` is null.
+- Always use "High" quality normals, which normalizes the normal in pixel shader. "Low" quality normals looked too much like a bug.
 - Re-enabled implicit MSAA resolve to backbuffer on Metal MacOS.
 
 ### Fixed

com.unity.render-pipelines.universal/ShaderLibrary/ShaderVariablesFunctions.hlsl

@@ -152,9 +152,12 @@ half OutputAlpha(half outputAlpha, half surfaceType = 0.0)
 // 3) In fragment when using normal map, because mikktspace sets up non orthonormal basis.
 // However we will try to balance performance vs quality here as also let users configure that as
 // shader quality tiers.
-// Low Quality Tier: Normalize either per-vertex or per-pixel depending if normalmap is sampled.
-// Medium Quality Tier: Always normalize per-vertex. Normalize per-pixel only if using normal map
-// High Quality Tier: Normalize in both vertex and pixel shaders.
+// Low Quality Tier: Don't normalize per-vertex.
+// Medium Quality Tier: Always normalize per-vertex.
+// High Quality Tier: Always normalize per-vertex.
+//
+// Always normalize per-pixel.
+// Too many bug like lighting quality issues otherwise.
 real3 NormalizeNormalPerVertex(real3 normalWS)
 {
     #if defined(SHADER_QUALITY_LOW) && defined(_NORMALMAP)
@@ -166,11 +169,7 @@ real3 NormalizeNormalPerVertex(real3 normalWS)
 
 real3 NormalizeNormalPerPixel(real3 normalWS)
 {
-    #if defined(SHADER_QUALITY_HIGH) || defined(_NORMALMAP)
-        return normalize(normalWS);
-    #else
-        return normalWS;
-    #endif
+    return normalize(normalWS);
 }