texture loading!

src/game/Gen.cpp

@@ -10,6 +10,10 @@ namespace Generated
     {
         return h.Idx != UINT32_MAX;
     }
+    bool IsValid(const TextureHandle& h)
+    {
+        return h.TextureIdx != UINT16_MAX && IsValid(h.Asset);
+    }
     bool operator==(const AssetHandle& lhs, const AssetHandle& rhs)
     {
         return lhs.Idx == rhs.Idx;