- Fixed objects motion vectors (they were upside down)

- Fixed some warnings

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Debug/DebugFullScreen.shader

                     {
                         arrow_coord.y = 1.0 - arrow_coord.y;
                     }
-                    arrow_coord *= _ScreenToTargetScale;
+                    arrow_coord *= _ScreenToTargetScale.xy;
 
                     float2 mv_arrow = SampleMotionVectors(arrow_coord);
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/MaterialUtilities.hlsl

     positionCS.xy = positionCS.xy / positionCS.w;
     previousPositionCS.xy = previousPositionCS.xy / previousPositionCS.w;
 
-    return (positionCS.xy - previousPositionCS.xy);
+    float2 velocity = (positionCS.xy - previousPositionCS.xy);
+
+#if UNITY_UV_STARTS_AT_TOP
+    velocity.y = -velocity.y;
+#endif
+    return velocity;
+
 #else
     return float2(0.0, 0.0);
 #endif

ScriptableRenderPipeline/HDRenderPipeline/HDRP/RenderPipelineResources/CopyDepthBuffer.shader

 
             float Frag(Varyings input) : SV_Depth
             {
-                PositionInputs posInputs = GetPositionInput(input.positionCS, _ScreenSize.zw);
+                PositionInputs posInputs = GetPositionInput(input.positionCS.xy, _ScreenSize.zw);
                 return LOAD_TEXTURE2D(_InputDepthTexture, posInputs.positionSS).x;
             }