Added error message if included DirectX DLLs are missing

UnleashedRecomp/locale/locale.cpp

@@ -692,6 +692,12 @@ std::unordered_map<std::string_view, std::unordered_map<ELanguage, std::string>>
             { ELanguage::Italian,  "Impossibile creare un backend D3D12 (Windows) o Vulkan.\n\nAssicurati che:\n\n- Il tuo sistema soddisfi i requisiti minimi.\n- I driver della scheda grafica siano aggiornati.\n- Il tuo sistema operativo sia aggiornato." }
         }
     },
+    {
+        "System_Win32_MissingDLLs",
+        {
+            { ELanguage::English, "The module \"%s\" could not be found.\n\nPlease make sure that:\n\n- You extracted this copy of Unleashed Recompiled fully and not just the *.exe file.\n- You are not running Unleashed Recompiled from a *.zip file." }
+        }
+    },
     {
         "Common_On",
         {

UnleashedRecomp/main.cpp

@@ -27,6 +27,15 @@
 #include <timeapi.h>
 #endif
 
+#if _WIN32 && UNLEASHED_RECOMP_D3D12
+static std::array<std::string_view, 3> g_D3D12RequiredModules =
+{
+    "D3D12/D3D12Core.dll",
+    "dxcompiler.dll",
+    "dxil.dll"
+};
+#endif
+
 const size_t XMAIOBegin = 0x7FEA0000;
 const size_t XMAIOEnd = XMAIOBegin + 0x0000FFFF;
 
@@ -180,6 +189,19 @@ int main(int argc, char *argv[])
 
     Config::Load();
 
+#if _WIN32 && UNLEASHED_RECOMP_D3D12
+    for (auto& dll : g_D3D12RequiredModules)
+    {
+        if (!std::filesystem::exists(g_executableRoot / dll))
+        {
+            char text[512];
+            snprintf(text, sizeof(text), Localise("System_Win32_MissingDLLs").c_str(), dll.data());
+            SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, GameWindow::GetTitle(), text, GameWindow::s_pWindow);
+            std::_Exit(1);
+        }
+    }
+#endif
+
     // Check the time since the last time an update was checked. Store the new time if the difference is more than six hours.
     constexpr double TimeBetweenUpdateChecksInSeconds = 6 * 60 * 60;
     time_t timeNow = std::time(nullptr);

UnleashedRecomp/user/paths.h

@@ -8,6 +8,8 @@
 #define GAME_INSTALL_DIRECTORY "."
 #endif
 
+extern std::filesystem::path g_executableRoot;
+
 inline std::filesystem::path GetGamePath()
 {
     return GAME_INSTALL_DIRECTORY;