h1-mod/src/client/component/virtuallobby.cpp

#include <std_include.hpp>
#include "loader/component_loader.hpp"

#include "game/game.hpp"
#include "game/dvars.hpp"

#include <utils/hook.hpp>

namespace virtuallobby
{
	namespace
	{
		game::dvar_t* virtual_lobby_fovscale;

		void* get_get_fovscale_stub()
		{
			return utils::hook::assemble([](utils::hook::assembler& a)
			{
				const auto ret = a.newLabel();
				const auto original = a.newLabel();

				a.pushad64();
				a.mov(rax, qword_ptr(0x2999CE8_b)); // virtualLobbyInFiringRange
				a.cmp(byte_ptr(rax, 0x10), 1);
				a.je(original);
				a.call_aligned(game::VirtualLobby_Loaded);
				a.cmp(al, 0);
				a.je(original);

				// virtuallobby
				a.popad64();
				a.mov(rax, ptr(reinterpret_cast<int64_t>(&virtual_lobby_fovscale)));
				a.jmp(ret);

				// original
				a.bind(original);
				a.popad64();
				a.mov(rax, qword_ptr(0x14C4EC8_b));
				a.jmp(ret);

				a.bind(ret);
				a.mov(rdi, rax);
				a.mov(ecx, 8);
				a.jmp(0x104545_b);
			});
		}
	}

	class component final : public component_interface
	{
	public:
		void post_unpack() override
		{
			if (!game::environment::is_mp())
			{
				return;
			}

			virtual_lobby_fovscale = dvars::register_float_hashed("virtualLobby_fovScale", 0.7f, 0.0f, 2.0f, 
				game::DVAR_FLAG_SAVED, "Field of view scaled for the virtual lobby");

			utils::hook::jump(0x104539_b, get_get_fovscale_stub(), true);
		}
	};
}

REGISTER_COMPONENT(virtuallobby::component)