From 5c81970558c1cf65be05f7c389fd8b06341b5a67 Mon Sep 17 00:00:00 2001
From: Ottermandias <nickroederspam+git1@gmail.com>
Date: Fri, 23 Sep 2022 17:59:07 +0200
Subject: [PATCH] Handle weird mip map/size inconsistencies, maybe?

---
 Penumbra/Import/Textures/TexFileParser.cs | 25 +++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Penumbra/Import/Textures/TexFileParser.cs b/Penumbra/Import/Textures/TexFileParser.cs
index 1d416f02..7c0afbb5 100644
--- a/Penumbra/Import/Textures/TexFileParser.cs
+++ b/Penumbra/Import/Textures/TexFileParser.cs
@@ -24,12 +24,37 @@ public static class TexFileParser
             throw new Exception( $"Could not obtain dimensionality from {header.Type}." );
         }
 
+        meta.MipLevels = CountMipLevels( data, in header );
+
         var scratch = ScratchImage.Initialize( meta );
+
         CopyData( scratch, r );
 
         return scratch;
     }
 
+    private static unsafe int CountMipLevels( Stream data, in TexFile.TexHeader header )
+    {
+        var lastOffset = 80u;
+        var levels     = 1;
+        for( var i = 1; i < 13; ++i )
+        {
+            var offset = header.OffsetToSurface[ i ];
+            var diff   = offset - lastOffset;
+            if( offset > 0 && offset < data.Length && diff > 0 )
+            {
+                lastOffset = offset;
+                ++levels;
+            }
+            else
+            {
+                return levels;
+            }
+        }
+
+        return 13;
+    }
+
     private static unsafe void CopyData( ScratchImage image, BinaryReader r )
     {
         fixed( byte* ptr = image.Pixels )