Fix backface normals, fix depth writing precision issues

1 files changed, 20 insertions, 3 deletions

diff --git a/2ner.cginc b/2ner.cginc
index d8bc010..065015f 100644
--- a/2ner.cginc
+++ b/2ner.cginc
@@ -156,7 +156,7 @@ v2f vert(appdata v) {
   return o;

 }

 

-float4 frag(v2f i

+float4 frag(v2f i, uint facing : SV_IsFrontFace

 #if defined(_HARNACK_TRACING) || defined(_SHATTER_WAVE) || defined(_VERTEX_DOMAIN_WARPING)

   , out float depth : SV_DepthLessEqual

 #endif

@@ -168,6 +168,8 @@ float4 frag(v2f i
   // Not necessarily normalized after interpolation

   i.normal = normalize(i.normal);

 

+  i.normal *= facing ? 1 : -1;

+

   i.normal = UnityObjectToWorldNormal(i.normal);

   i.tangent = UnityObjectToWorldNormal(i.tangent);

   i.binormal = UnityObjectToWorldNormal(i.binormal);

@@ -178,8 +180,23 @@ float4 frag(v2f i
 

 #if defined(_SHATTER_WAVE) || defined(_VERTEX_DOMAIN_WARPING)

   {

-    float4 clip_pos = mul(UNITY_MATRIX_VP, float4(i.worldPos, 1.0));

-    depth = clip_pos.z / clip_pos.w;

+    [branch]

+    if (

+        false

+#if defined(_SHATTER_WAVE)

+        || any(_Shatter_Wave_Amplitude > 1E-4)

+#endif

+#if defined(_VERTEX_DOMAIN_WARPING)

+        || _Vertex_Domain_Warping_Octaves > 0.1

+#endif

+    ) {

+      float4 clip_pos = UnityObjectToClipPos(i.objPos);

+      depth = clip_pos.z / clip_pos.w;

+    } else {

+      // Perspective division takes place before the fragment shader, so we

+      // don't have to divide again.

+      depth = i.pos.z;

+    }

   }

 #endif