Merge pull request #330 from EvgeniiG/master

Fix tessellation during the shadow pass

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.hlsl

 {
     float maxDisplacement = GetMaxDisplacement();
 
+#if defined(SHADERPASS) && (SHADERPASS != SHADERPASS_SHADOWS)
+#else
+    bool frustumCulled = WorldViewFrustumCull(p0, p1, p2, maxDisplacement, (float4[4])unity_CameraWorldClipPlanes);
+#endif
-    // We use the position of the primary (scene view) camera in order
-    // to have identical tessellation levels for both the scene view and
-    // shadow views. Otherwise, depth comparisons become meaningless!
-    float3 camPosWS = GetPrimaryCameraPosition();
-
-        faceCull = BackFaceCullTriangle(p0, p1, p2, _TessellationBackFaceCullEpsilon, camPosWS);
+        faceCull = BackFaceCullTriangle(p0, p1, p2, _TessellationBackFaceCullEpsilon, GetCurrentViewPosition());
     }
 #endif
 
         return float4(0.0, 0.0, 0.0, 0.0);
     }
 
+    // We use the parameters of the primary (scene view) camera in order
+    // to have identical tessellation levels for both the scene view and
+    // shadow views. Otherwise, depth comparisons become meaningless!
-    // Aaptive screen space tessellation
+    // Adaptive screen space tessellation
-        tessFactor *= GetScreenSpaceTessFactor( p0, p1, p2, GetWorldToHClipMatrix(), _ScreenParams,  _TessellationFactorTriangleSize);
+        tessFactor *= GetScreenSpaceTessFactor( p0, p1, p2, _ViewProjMatrix, _ScreenSize, _TessellationFactorTriangleSize);
-        float3 distFactor = GetDistanceBasedTessFactor(p0, p1, p2, camPosWS, _TessellationFactorMinDistance, _TessellationFactorMaxDistance);
+        float3 distFactor = GetDistanceBasedTessFactor(p0, p1, p2, GetPrimaryCameraPosition(), _TessellationFactorMinDistance, _TessellationFactorMaxDistance);
         // We square the disance factor as it allow a better percptual descrease of vertex density.
         tessFactor *= distFactor * distFactor;
     }

Assets/ScriptableRenderPipeline/ShaderLibrary/Tessellation.hlsl

     return (dot(V, N) < backFaceCullEpsilon) ? true : false;
 }
 
-float2 GetScreenSpacePosition(float3 positionWS, float4x4 viewProjectionMatrix, float4 screenParams)
+float2 GetScreenSpacePosition(float3 positionWS, float4x4 viewProjectionMatrix, float4 screenSize)
-    return (positionSS * 0.5 + 0.5) * float2(screenParams.x, -screenParams.y);
+    return (positionSS * 0.5 + 0.5) * float2(screenSize.x, -screenSize.y);
-float3 GetScreenSpaceTessFactor(float3 p0, float3 p1, float3 p2, float4x4 viewProjectionMatrix, float4 screenParams, float triangleSize)
+float3 GetScreenSpaceTessFactor(float3 p0, float3 p1, float3 p2, float4x4 viewProjectionMatrix, float4 screenSize, float triangleSize)
-    float2 edgeScreenPosition0 = GetScreenSpacePosition(p0, viewProjectionMatrix, screenParams);
-    float2 edgeScreenPosition1 = GetScreenSpacePosition(p1, viewProjectionMatrix, screenParams);
-    float2 edgeScreenPosition2 = GetScreenSpacePosition(p2, viewProjectionMatrix, screenParams);
+    float2 edgeScreenPosition0 = GetScreenSpacePosition(p0, viewProjectionMatrix, screenSize);
+    float2 edgeScreenPosition1 = GetScreenSpacePosition(p1, viewProjectionMatrix, screenSize);
+    float2 edgeScreenPosition2 = GetScreenSpacePosition(p2, viewProjectionMatrix, screenSize);
 
     float EdgeScale = 1.0 / triangleSize; // Edge size in reality, but name is simpler
     float3 tessFactor;