From 0b02fab0711e36dc010b9b3b634bde810fa66cc3 Mon Sep 17 00:00:00 2001
From: Federico Cecchetto <fedecek3@gmail.com>
Date: Thu, 6 Jan 2022 23:13:23 +0100
Subject: [PATCH] Prevent cg_fov/scale from being reset

---
 src/client/component/patches.cpp | 35 ++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/src/client/component/patches.cpp b/src/client/component/patches.cpp
index 973f3ea8..48ef8868 100644
--- a/src/client/component/patches.cpp
+++ b/src/client/component/patches.cpp
@@ -5,11 +5,15 @@
 #include "game/dvars.hpp"
 
 #include <utils/hook.hpp>
+#include <utils/string.hpp>
 
 namespace patches
 {
 	namespace
 	{
+		utils::hook::detour gscr_set_save_dvar_hook;
+		utils::hook::detour dvar_register_float_hook;
+
 		void* sub_46148()
 		{
 			static uint64_t off_11C52460 = 0xAD0C58_b;
@@ -21,6 +25,30 @@ namespace patches
 			component_loader::pre_destroy();
 			exit(0);
 		}
+
+		void gscr_set_save_dvar_stub()
+		{
+			const auto string = utils::string::to_lower(utils::hook::invoke<const char*>(0x5C7C20_b, 0));
+			if (string == "cg_fov" || string == "cg_fovscale")
+			{
+				return;
+			}
+
+			gscr_set_save_dvar_hook.invoke<void>();
+		}
+
+		game::dvar_t* dvar_register_float_stub(int hash, const char* dvarName, float value, float min, float max, unsigned int flags)
+		{
+			static const auto cg_fov_hash = game::generateHashValue("cg_fov");
+			static const auto cg_fov_scale_hash = game::generateHashValue("cg_fovscale");
+
+			if (hash == cg_fov_hash || hash == cg_fov_scale_hash)
+			{
+				flags |= game::DvarFlags::DVAR_FLAG_SAVED;
+			}
+
+			return dvar_register_float_hook.invoke<game::dvar_t*>(hash, dvarName, value, min, max, flags);
+		}
 	}
 
 	class component final : public component_interface
@@ -40,6 +68,13 @@ namespace patches
 
 			// Disable battle net popup
 			utils::hook::nop(0x5F4496_b, 5);
+
+			// Prevent game from overriding cg_fov and cg_fovscale values
+			gscr_set_save_dvar_hook.create(0x504C60_b, &gscr_set_save_dvar_stub);
+			// Make cg_fov and cg_fovscale saved dvars
+			dvar_register_float_hook.create(game::Dvar_RegisterFloat.get(), dvar_register_float_stub);
+			// Don't make the game reset cg_fov and cg_fovscale along with other dvars
+			utils::hook::nop(0x4C8A08_b, 5);
 		}
 	};
 }