refactor: introduce subasset loading

src/ObjWriting/ObjWriter.cpp

@@ -0,0 +1,57 @@
+#include "ObjWriter.h"
+
+#include "Game/IW3/ObjWriterIW3.h"
+#include "Game/IW4/ObjWriterIW4.h"
+#include "Game/IW5/ObjWriterIW5.h"
+#include "Game/T5/ObjWriterT5.h"
+#include "Game/T6/ObjWriterT6.h"
+#include "ObjWriting.h"
+
+#include <cassert>
+
+bool IObjWriter::DumpZone(AssetDumpingContext& context)
+{
+    m_asset_dumpers.clear();
+    RegisterAssetDumpers(context);
+
+    if (context.ShouldTrackProgress())
+    {
+        size_t totalProgress = 0uz;
+        for (const auto& dumper : m_asset_dumpers)
+            totalProgress += dumper->GetProgressTotalCount(context);
+
+        context.SetTotalProgress(totalProgress);
+    }
+
+    for (const auto& dumper : m_asset_dumpers)
+        dumper->Dump(context);
+
+    return true;
+}
+
+void IObjWriter::RegisterAssetDumper(std::unique_ptr<IAssetDumper> dumper)
+{
+    const auto maybeHandlingAssetType = dumper->GetHandlingAssetType();
+    if (maybeHandlingAssetType.has_value() && !ObjWriting::ShouldHandleAssetType(*maybeHandlingAssetType))
+        return;
+
+    m_asset_dumpers.emplace_back(std::move(dumper));
+}
+
+IObjWriter* IObjWriter::GetObjWriterForGame(GameId game)
+{
+    static IObjWriter* objWriters[static_cast<unsigned>(GameId::COUNT)]{
+        new IW3::ObjWriter(),
+        new IW4::ObjWriter(),
+        new IW5::ObjWriter(),
+        new T5::ObjWriter(),
+        new T6::ObjWriter(),
+    };
+    static_assert(std::extent_v<decltype(objWriters)> == static_cast<unsigned>(GameId::COUNT));
+
+    assert(static_cast<unsigned>(game) < static_cast<unsigned>(GameId::COUNT));
+    auto* result = objWriters[static_cast<unsigned>(game)];
+    assert(result);
+
+    return result;
+}