draft 2

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.cs

         public enum GBufferMaterial
         {
             // Note: This count doesn't include the velocity buffer. On shader and csharp side the velocity buffer will be added by the framework
-            Count = (ShaderConfig.k_PackgbufferInU16 == 1) ? 2 : 4
+            Count =  4
         };
 
         //-----------------------------------------------------------------------------
         RenderTextureFormat[] m_RTFormat4 = { RenderTextureFormat.ARGB32, RenderTextureFormat.ARGB2101010, RenderTextureFormat.ARGB32, RenderTextureFormat.RGB111110Float };
         RenderTextureReadWrite[] m_RTReadWrite4 = { RenderTextureReadWrite.sRGB, RenderTextureReadWrite.Linear, RenderTextureReadWrite.Linear, RenderTextureReadWrite.Linear };
 
-        // TODO: Just discovered that Unity doesn't support unsigned 16 RT format.
-        RenderTextureFormat[] m_RTFormat2 = { RenderTextureFormat.ARGBInt, RenderTextureFormat.ARGBInt };
-        RenderTextureReadWrite[] m_RTReadWrite2 = { RenderTextureReadWrite.Linear, RenderTextureReadWrite.Linear };
-
-            if (ShaderConfig.s_PackgbufferInU16 == 1)
-            {
-                RTFormat = m_RTFormat2;
-                RTReadWrite = m_RTReadWrite2;
-            }
-            else
-            {
-                RTFormat = m_RTFormat4;
-                RTReadWrite = m_RTReadWrite4;
-            }
+            RTFormat = m_RTFormat4;
+            RTReadWrite = m_RTReadWrite4;
         }
 
         //-----------------------------------------------------------------------------

ScriptableRenderPipeline/HDRenderPipeline/ShaderConfig.cs

         // 3) When this is solve (i.e move previousPositionCS to a free attribute semantic), Unity only support one pSecondaryFormat. Mean if we ahve a vertex color instance stream and motion vector, motion vector will overwrite vertex color stream. See MeshRenderingData.cpp
         // All this could be fix we a new Mesh API not ready yet. Note that this feature only affect animated mesh (vertex or skin) as others use depth reprojection.
         VelocityInGBuffer = 0, // Change to 1 to enable the feature, then regenerate hlsl headers.
-        // TODO: not working yet, waiting for UINT16 RT format support
-        PackGBufferInU16 = 0,
         CameraRelativeRendering = 1 // Rendering sets the origin of the world to the position of the primary (scene view) camera
     };
 
         // but it is usually small, so we are fine with it (until someone at microsoft fix the debuggger).
         public const int k_VelocityInGbuffer = (int)ShaderOptions.VelocityInGBuffer;
         public static int s_VelocityInGbuffer = (int)ShaderOptions.VelocityInGBuffer;
-
-        public const int k_PackgbufferInU16 = (int)ShaderOptions.PackGBufferInU16;
-        public static int s_PackgbufferInU16 = (int)ShaderOptions.PackGBufferInU16;
 
         public const int k_CameraRelativeRendering = (int)ShaderOptions.CameraRelativeRendering;
         public static int s_CameraRelativeRendering = (int)ShaderOptions.CameraRelativeRendering;

ScriptableRenderPipeline/HDRenderPipeline/ShaderConfig.cs.hlsl

 // UnityEngine.Experimental.Rendering.HDPipeline.ShaderOptions:  static fields
 //
 #define SHADEROPTIONS_VELOCITY_IN_GBUFFER (0)
-#define SHADEROPTIONS_PACK_GBUFFER_IN_U16 (0)
 #define SHADEROPTIONS_CAMERA_RELATIVE_RENDERING (1)