From f8a8edde2171de3a973759363486c5968a40208d Mon Sep 17 00:00:00 2001
From: momo5502 <mauriceheumann@gmail.com>
Date: Thu, 7 Jan 2016 16:55:10 +0100
Subject: [PATCH] Implement steam overlay.

---
 .gitmodules                         |  4 ----
 src/Steam/Interfaces/SteamUtils.cpp |  5 +++++
 src/Steam/Steam.cpp                 | 20 ++++++++++++++++++++
 src/Steam/Steam.hpp                 |  2 ++
 src/Utils/Hooking.hpp               |  5 +++++
 5 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/.gitmodules b/.gitmodules
index be58e14f..ccba2999 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,7 +1,3 @@
-[submodule "tools/premake/github-package"]
-	path = tools/premake/github-package
-	url = https://github.com/mversluys/premake-github-package.git
-	branch = master
 [submodule "deps/zlib"]
 	path = deps/zlib
 	url = https://github.com/madler/zlib.git
diff --git a/src/Steam/Interfaces/SteamUtils.cpp b/src/Steam/Interfaces/SteamUtils.cpp
index 7bfbb9b2..296f959c 100644
--- a/src/Steam/Interfaces/SteamUtils.cpp
+++ b/src/Steam/Interfaces/SteamUtils.cpp
@@ -54,6 +54,11 @@ namespace Steam
 
 	void Utils::SetOverlayNotificationPosition(int eNotificationPosition)
 	{
+		if (Steam::Overlay)
+		{
+			FARPROC setPosition = GetProcAddress(Steam::Overlay, "SetNotificationPosition");
+			::Utils::Hook::Call<void(int)>(setPosition)(eNotificationPosition);
+		}
 	}
 
 	bool Utils::IsAPICallCompleted(unsigned __int64 hSteamAPICall, bool *pbFailed)
diff --git a/src/Steam/Steam.cpp b/src/Steam/Steam.cpp
index cae565f3..d74d5410 100644
--- a/src/Steam/Steam.cpp
+++ b/src/Steam/Steam.cpp
@@ -3,6 +3,8 @@
 
 namespace Steam
 {
+	HMODULE Overlay = 0;
+
 	uint64_t Callbacks::CallID = 0;
 	std::map<uint64_t, bool> Callbacks::Calls;
 	std::map<uint64_t, Callbacks::Base*> Callbacks::ResultHandlers;
@@ -70,6 +72,24 @@ namespace Steam
 	{
 		bool SteamAPI_Init()
 		{
+			Overlay = GetModuleHandleA("gameoverlayrenderer.dll");
+
+			if (!Overlay)
+			{
+				HKEY hRegKey;
+				char steamPath[MAX_PATH] = { 0 };
+				if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Valve\\Steam", 0, KEY_QUERY_VALUE, &hRegKey) == ERROR_SUCCESS)
+				{
+					DWORD dwLength = sizeof(steamPath);
+					RegQueryValueExA(hRegKey, "InstallPath", NULL, NULL, (BYTE*)steamPath, &dwLength);
+					RegCloseKey(hRegKey);
+
+					SetDllDirectory(steamPath);
+				}
+
+				Overlay = LoadLibraryA(::Utils::VA("%s\\%s", steamPath, "gameoverlayrenderer.dll"));
+			}
+
 			return true;
 		}
 
diff --git a/src/Steam/Steam.hpp b/src/Steam/Steam.hpp
index c8abd611..0c51403c 100644
--- a/src/Steam/Steam.hpp
+++ b/src/Steam/Steam.hpp
@@ -88,4 +88,6 @@ namespace Steam
 	STEAM_EXPORT Steam::RemoteStorage* SteamRemoteStorage();
 	STEAM_EXPORT Steam::User* SteamUser();
 	STEAM_EXPORT Steam::Utils* SteamUtils();
+
+	extern HMODULE Overlay;
 }
diff --git a/src/Utils/Hooking.hpp b/src/Utils/Hooking.hpp
index e7e7d6e4..08983163 100644
--- a/src/Utils/Hooking.hpp
+++ b/src/Utils/Hooking.hpp
@@ -28,6 +28,11 @@ namespace Utils
 			return std::function<T>((T*)function);
 		}
 
+		template <typename T> static std::function<T> Call(FARPROC function)
+		{
+			return Call<T>((DWORD)function);
+		}
+
 		static void SetString(void* place, const char* string, size_t length);
 		static void SetString(DWORD place, const char* string, size_t length);