Update ESM4 LTEX loading

Load grasses into a list
Fix FO4 loading
Load Havok parameters for FNV

components/esm4/loadltex.cpp

@@ -35,8 +35,6 @@ void ESM4::LandTexture::load(ESM4::Reader& reader)
 {
     mId = reader.getFormIdFromHeader();
     mFlags = reader.hdr().record.flags;
-    std::uint32_t esmVer = reader.esmVersion();
-    bool isFONV = esmVer == ESM::VER_132 || esmVer == ESM::VER_133 || esmVer == ESM::VER_134;
 
     while (reader.getSubRecordHeader())
     {
@@ -48,26 +46,23 @@ void ESM4::LandTexture::load(ESM4::Reader& reader)
                 break;
             case ESM4::SUB_HNAM:
             {
-                if (isFONV)
+                // TES5+
-                {
+                if (subHdr.dataSize == 2)
-                    reader.skipSubRecordData(); // FIXME: skip FONV for now
-                    break;
-                }
-
-                if ((reader.esmVersion() == ESM::VER_094 || reader.esmVersion() == ESM::VER_170)
-                    && subHdr.dataSize == 2) // FO3 is VER_094 but dataSize 3
                 {
                     reader.get(mHavokFriction);
                     reader.get(mHavokRestitution);
                 }
-                else
+                // TES4, FO3, FNV
+                else if (subHdr.dataSize == 3)
                 {
-                    if (subHdr.dataSize != 3)
-                        throw std::runtime_error("LTEX unexpected HNAM size, expected 3");
                     reader.get(mHavokMaterial);
                     reader.get(mHavokFriction);
                     reader.get(mHavokRestitution);
                 }
+                else
+                {
+                    reader.skipSubRecordData();
+                }
                 break;
             }
             case ESM4::SUB_ICON:
@@ -77,14 +72,14 @@ void ESM4::LandTexture::load(ESM4::Reader& reader)
                 reader.get(mTextureSpecular);
                 break;
             case ESM4::SUB_GNAM:
-                reader.getFormId(mGrass);
+                reader.getFormId(mGrass.emplace_back());
                 break;
             case ESM4::SUB_TNAM:
                 reader.getFormId(mTexture);
-                break; // TES5 only
+                break; // TES5, FO4
             case ESM4::SUB_MNAM:
                 reader.getFormId(mMaterial);
-                break; // TES5 only
+                break; // TES5, FO4
             default:
                 throw std::runtime_error("ESM4::LTEX::load - Unknown subrecord " + ESM::printName(subHdr.typeId));
         }

components/esm4/loadltex.hpp

@@ -49,14 +49,14 @@ namespace ESM4
         std::uint8_t mHavokRestitution;
 
         std::uint8_t mTextureSpecular; // default 30
-        ESM::FormId mGrass;
+        std::vector<ESM::FormId> mGrass;
 
         // ------ TES4 only -----
 
         std::string mTextureFile;
         std::uint8_t mHavokMaterial;
 
-        // ------ TES5 only -----
+        // ------ TES5, FO4 -----
 
         ESM::FormId mTexture;
         ESM::FormId mMaterial;