Add 3DGS D3D12 MVS bootstrap and PLY loader

MVS/3DGS-D3D12/src/main.cpp

@@ -0,0 +1,39 @@
+#include <windows.h>
+#include <shellapi.h>
+
+#include <string>
+
+#include "XC3DGSD3D12/App.h"
+
+int WINAPI wWinMain(HINSTANCE instance, HINSTANCE, PWSTR, int showCommand) {
+    XC3DGSD3D12::App app;
+
+    int argumentCount = 0;
+    LPWSTR* arguments = CommandLineToArgvW(GetCommandLineW(), &argumentCount);
+    for (int index = 1; index + 1 < argumentCount; ++index) {
+        if (std::wstring(arguments[index]) == L"--frame-limit") {
+            app.SetFrameLimit(static_cast<unsigned int>(_wtoi(arguments[index + 1])));
+            ++index;
+        } else if (std::wstring(arguments[index]) == L"--scene") {
+            app.SetGaussianScenePath(arguments[index + 1]);
+            ++index;
+        } else if (std::wstring(arguments[index]) == L"--summary-file") {
+            app.SetSummaryPath(arguments[index + 1]);
+            ++index;
+        }
+    }
+    if (arguments != nullptr) {
+        LocalFree(arguments);
+    }
+
+    if (!app.Initialize(instance, showCommand)) {
+        const std::wstring message =
+            app.GetLastErrorMessage().empty()
+            ? L"Failed to initialize XC 3DGS D3D12 MVS."
+            : app.GetLastErrorMessage();
+        MessageBoxW(nullptr, message.c_str(), L"Initialization Error", MB_OK | MB_ICONERROR);
+        return -1;
+    }
+
+    return app.Run();
+}