Merge pull request #343 from slime73/v2-taa-jitter

Fix shadowmap jitter issues with TAA.

Author: Chman

PostProcessing/Runtime/Effects/TemporalAntialiasing.cs

@@ -69,9 +69,11 @@ internal void ResetHistory()
 
         Vector2 GenerateRandomOffset()
         {
+            // The variance between 0 and the actual halton sequence values reveals noticeable instability
+            // in Unity's shadow maps, so we avoid index 0.
             var offset = new Vector2(
-                    HaltonSeq.Get(m_SampleIndex & 1023, 2),
-                    HaltonSeq.Get(m_SampleIndex & 1023, 3)
+                    HaltonSeq.Get((m_SampleIndex & 1023) + 1, 2) - 0.5f,
+                    HaltonSeq.Get((m_SampleIndex & 1023) + 1, 3) - 0.5f
                 );
 
             if (++m_SampleIndex >= k_SampleCount)