Merge branch 'master' into metal

Assets/ScriptableRenderPipeline/ShaderLibrary/Common.hlsl

 // Texture format sampling
 // ----------------------------------------------------------------------------
 
-float2 DirectionToLatLongCoordinate(float3 dir)
+float2 DirectionToLatLongCoordinate(float3 dir_in)
+    float3 dir = normalize(dir_in);
     // coordinate frame is (-Z, X) meaning negative Z is primary axis and X is secondary axis.
     return float2(1.0 - 0.5 * INV_PI * atan2(dir.x, -dir.z), asin(dir.y) * INV_PI + 0.5);
 }

Assets/ScriptableRenderPipeline/common/CubeToSpherical.shader

     return o;
 }
 
-half2 DirectionToSphericalTexCoordinate(half3 dir)      // use this for the lookup
+half2 DirectionToSphericalTexCoordinate(half3 dir_in)      // use this for the lookup
+    half3 dir = normalize(dir_in);
     // coordinate frame is (-Z,X) meaning negative Z is primary axis and X is secondary axis.
     float recipPi = 1.0/3.1415926535897932384626433832795;
     return half2( 1.0-0.5*recipPi*atan2(dir.x, -dir.z), asin(dir.y)*recipPi+0.5 );

Assets/ScriptableRenderPipeline/common/ShaderBase.h

 #ifndef __SHADERBASE_H__
 #define __SHADERBASE_H__
 
-half2 DirectionToSphericalTexCoordinate(half3 dir)
+half2 DirectionToSphericalTexCoordinate(half3 dir_in)
+    half3 dir = normalize(dir_in);
     // coordinate frame is (-Z,X) meaning negative Z is primary axis and X is secondary axis.
     float recipPi = 1.0 / 3.1415926535897932384626433832795;
     return half2(1.0 - 0.5 * recipPi * atan2(dir.x, -dir.z), asin(dir.y) * recipPi + 0.5);