Fix Logitech G15 in Warhead launcher

CHANGELOG.md

@@ -3,6 +3,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+### Fixed
+- Fix startup crash of Warhead launcher when Logitech G15 keyboard is connected
+([#39](https://github.com/ccomrade/c1-launcher/issues/39)).
+
 ## [v6] - 2024-02-15
 ### Added
 - Crysis Editor (Sandbox 2) support.

Code/Launcher/Game/GameLauncher.cpp

@@ -90,6 +90,8 @@ void GameLauncher::PatchEngine()
 		}
 
 		MemoryPatch::CryAction::AllowDX9ImmersiveMultiplayer(m_dlls.pEXE, m_dlls.gameBuild);
+
+		MemoryPatch::WarheadEXE::FixHInstance(m_dlls.pEXE, m_dlls.gameBuild);
 	}
 
 	if (m_dlls.pCryGame)

Code/Launcher/MemoryPatch.cpp

@@ -3240,6 +3240,41 @@ void MemoryPatch::CryRenderNULL::DisableDebugRenderer(void* pCryRenderNULL, int
 	}
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// WarheadEXE
+////////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Initializes the global hInstance pointer in the Warhead EXE.
+ *
+ * Normally, WinMain initializes it, but we load Warhead EXE as a DLL without executing its WinMain function.
+ * Only the Logitech G15 display interface uses it to obtain its bitmap resources from the EXE.
+ *
+ * Only game launcher needs this.
+ */
+void MemoryPatch::WarheadEXE::FixHInstance(void* pEXE, int gameBuild)
+{
+	switch (gameBuild)
+	{
+#ifdef BUILD_64BIT
+		case 710:
+		case 711:
+		{
+			*static_cast<void**>(ByteOffset(pEXE, 0x80BBE8)) = pEXE;
+			break;
+		}
+#else
+		case 687:
+		case 710:
+		case 711:
+		{
+			// TODO: 32-bit Crysis Warhead
+			break;
+		}
+#endif
+	}
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Editor
 ////////////////////////////////////////////////////////////////////////////////

Code/Launcher/MemoryPatch.h

@@ -70,6 +70,11 @@ namespace MemoryPatch
 		void DisableDebugRenderer(void* pCryRenderNULL, int gameBuild);
 	}
 
+	namespace WarheadEXE
+	{
+		void FixHInstance(void* pEXE, int gameBuild);
+	}
+
 	namespace Editor
 	{
 		struct Version