From 53950fdd6a3645d1de4210f81b3bbdf9dc5c60ff Mon Sep 17 00:00:00 2001
From: ianpatt <ianpatt@gmail.com>
Date: Fri, 1 Sep 2023 10:55:29 -0700
Subject: [PATCH] show version in options screen

---
 sfse/CMakeLists.txt    |  2 ++
 sfse/Hooks_Version.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++
 sfse/Hooks_Version.h   |  3 +++
 sfse/sfse.cpp          |  4 ++++
 4 files changed, 53 insertions(+)
 create mode 100644 sfse/Hooks_Version.cpp
 create mode 100644 sfse/Hooks_Version.h

diff --git a/sfse/CMakeLists.txt b/sfse/CMakeLists.txt
index 9cb87f6..233bac6 100644
--- a/sfse/CMakeLists.txt
+++ b/sfse/CMakeLists.txt
@@ -55,6 +55,8 @@ source_group(
 source_group(
 	${PROJECT_NAME}/hooks
 	FILES
+		Hooks_Version.cpp
+		Hooks_Version.h
 )
 
 source_group(
diff --git a/sfse/Hooks_Version.cpp b/sfse/Hooks_Version.cpp
new file mode 100644
index 0000000..12baf71
--- /dev/null
+++ b/sfse/Hooks_Version.cpp
@@ -0,0 +1,44 @@
+#include "Hooks_Version.h"
+#include "sfse_common/SafeWrite.h"
+#include "sfse_common/sfse_version.h"
+#include "sfse_common/Errors.h"
+#include "sfse_common/BranchTrampoline.h"
+#include "sfse_common/Relocation.h"
+#include "xbyak/xbyak.h"
+#include <cstring>
+
+const char * kHook_ShowVersion_FormatString =
+	"%08x v%s [SFSE " __PREPRO_TOKEN_STR__(SFSE_VERSION_INTEGER) "."
+	__PREPRO_TOKEN_STR__(SFSE_VERSION_INTEGER_MINOR) "."
+	__PREPRO_TOKEN_STR__(SFSE_VERSION_INTEGER_BETA) "]";
+RelocAddr <uintptr_t> kHook_ShowVersion_Offset(0x02079A7D);
+
+void Hooks_Version_Apply()
+{
+	// show SFSE version in menu
+	{
+		struct ShowVersion_Code: Xbyak::CodeGenerator {
+			ShowVersion_Code(void * buf) : Xbyak::CodeGenerator(4096, buf)
+			{
+				Xbyak::Label retnLabel;
+				Xbyak::Label dataLabel;
+
+				mov(rdx, ptr[rip + dataLabel]);
+				jmp(ptr[rip + retnLabel]);
+
+				L(retnLabel);
+				dq(kHook_ShowVersion_Offset.getUIntPtr() + 0x7);
+
+				L(dataLabel);
+				dq(uintptr_t(kHook_ShowVersion_FormatString));
+			}
+		};
+
+		void * codeBuf = g_localTrampoline.startAlloc();
+		ShowVersion_Code code(codeBuf);
+		g_localTrampoline.endAlloc(code.getCurr());
+
+		g_branchTrampoline.write6Branch(kHook_ShowVersion_Offset.getUIntPtr(), uintptr_t(code.getCode()));
+		safeWrite8(kHook_ShowVersion_Offset.getUIntPtr() + 6, 0x90);
+	}
+}
diff --git a/sfse/Hooks_Version.h b/sfse/Hooks_Version.h
new file mode 100644
index 0000000..96e0868
--- /dev/null
+++ b/sfse/Hooks_Version.h
@@ -0,0 +1,3 @@
+#pragma once
+
+void Hooks_Version_Apply();
diff --git a/sfse/sfse.cpp b/sfse/sfse.cpp
index 0cab554..62c88e9 100644
--- a/sfse/sfse.cpp
+++ b/sfse/sfse.cpp
@@ -8,6 +8,8 @@
 #include "sfse_common/BranchTrampoline.h"
 #include "PluginManager.h"
 
+#include "Hooks_Version.h"
+
 HINSTANCE g_moduleHandle = nullptr;
 
 void SFSE_Preinit();
@@ -136,6 +138,8 @@ void SFSE_Initialize()
 	g_pluginManager.installPlugins(PluginManager::kPhase_Preload);
 	g_pluginManager.loadComplete();
 
+	Hooks_Version_Apply();
+
 	FlushInstructionCache(GetCurrentProcess(), NULL, 0);
 
 	_MESSAGE("init complete");