PBR Shader: support two-channel normal maps

DiligentGraphics · Oct 10, 2024 · 79fa833 · 79fa833
1 parent 3e4dd9b
commit 79fa833
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/Shaders/PBR/private/PBR_Textures.fxh b/Shaders/PBR/private/PBR_Textures.fxh
@@ -535,6 +535,11 @@ float3 GetMicroNormal(PBRMaterialShaderInfo Material,
 
     MicroNormal = MicroNormal * float3(2.0, 2.0, 2.0) - float3(1.0, 1.0, 1.0);
     MicroNormal.xy *= Material.Basic.NormalScale;
+    if (MicroNormal.z < 0.0)
+    {
+        // The texture does not contain the Z component of the normal.
+        MicroNormal.z = sqrt(max(1.0 - dot(MicroNormal.xy, MicroNormal.xy), 0.0));
+    }
     return MicroNormal;
 }
 
@@ -710,6 +715,11 @@ float3 GetClearcoatNormal(PBRMaterialShaderInfo Material,
 
     ClearcoatNormal = ClearcoatNormal * float3(2.0, 2.0, 2.0) - float3(1.0, 1.0, 1.0);
     ClearcoatNormal.xy *= Material.Basic.ClearcoatNormalScale;
+    if (ClearcoatNormal.z < 0.0)
+    {
+        // The texture does not contain the Z component of the normal.
+        ClearcoatNormal.z = sqrt(max(1.0 - dot(ClearcoatNormal.xy, ClearcoatNormal.xy), 0.0));
+    }
     return ClearcoatNormal;
 }