From aaba9cbcc5686ae015b2787a5fd7cec3adc929cd Mon Sep 17 00:00:00 2001
From: Skull <86374920+skkuull@users.noreply.github.com>
Date: Sat, 8 Oct 2022 00:19:02 +0300
Subject: [PATCH] add bounces & gravity dvars

---
 src/client/component/gameplay.cpp | 77 +++++++++++++++++++++++++++++++
 src/client/game/dvars.cpp         |  3 ++
 src/client/game/dvars.hpp         |  3 ++
 3 files changed, 83 insertions(+)
 create mode 100644 src/client/component/gameplay.cpp

diff --git a/src/client/component/gameplay.cpp b/src/client/component/gameplay.cpp
new file mode 100644
index 00000000..382a42f8
--- /dev/null
+++ b/src/client/component/gameplay.cpp
@@ -0,0 +1,77 @@
+#include <std_include.hpp>
+#include "loader/component_loader.hpp"
+
+#include "dvars.hpp"
+
+#include "game/game.hpp"
+#include "game/dvars.hpp"
+
+#include <utils/nt.hpp>
+#include <utils/hook.hpp>
+#include <utils/flags.hpp>
+
+namespace gameplay
+{
+	namespace
+	{
+		void* bg_bounces_stub()
+		{
+			return utils::hook::assemble([](utils::hook::assembler& a)
+			{
+				const auto no_bounce = a.newLabel();
+				const auto loc_70FB6F = a.newLabel();
+
+				a.push(rax);
+
+				a.mov(rax, qword_ptr(reinterpret_cast<int64_t>(&dvars::bg_bounces)));
+				a.mov(al, byte_ptr(rax, 0x10));
+				a.cmp(ptr(rbp, -0x66), al);
+
+				a.pop(rax);
+				a.jz(no_bounce);
+				a.jmp(0x70FBF0_b);
+
+				a.bind(no_bounce);
+				a.cmp(ptr(rsp, 0x44), r14d);
+				a.jnz(loc_70FB6F);
+				a.jmp(0x70FBE1_b);
+
+				a.bind(loc_70FB6F);
+				a.jmp(0x70FB6F_b);
+			});
+		}
+
+		void* bg_gravity_stub()
+		{
+			return utils::hook::assemble([](utils::hook::assembler& a)
+			{
+				a.mov(rax, qword_ptr(reinterpret_cast<int64_t>(&dvars::bg_gravity)));
+				a.mov(eax, dword_ptr(rax, 0x10));
+				a.mov(dword_ptr(rdi, 0x78), eax);
+				
+				a.call(0xBB3030_b);
+				a.mov(ptr(rdi, 0x32C), eax);
+
+				a.jmp(0xAFA342_b);
+			});
+		}
+	}
+
+	class component final : public component_interface
+	{
+	public:
+		void post_unpack() override
+		{
+			// Implement bounces
+			dvars::bg_bounces = game::Dvar_RegisterBool("bg_bounces", false, game::DVAR_FLAG_REPLICATED, "Enables bouncing");
+			utils::hook::jump(0x70FBB7_b, bg_bounces_stub(), true);
+
+			// Implement gravity dvar
+			dvars::bg_gravity = game::Dvar_RegisterInt("bg_gravity", 800, 0, 1000, game::DVAR_FLAG_REPLICATED, "Game gravity in inches per second squared");
+			utils::hook::nop(0xAFA330_b, 13);
+			utils::hook::jump(0xAFA330_b, bg_gravity_stub(), true);
+		}
+	};
+}
+
+REGISTER_COMPONENT(gameplay::component)
\ No newline at end of file
diff --git a/src/client/game/dvars.cpp b/src/client/game/dvars.cpp
index 1b74ecf1..63f32ba1 100644
--- a/src/client/game/dvars.cpp
+++ b/src/client/game/dvars.cpp
@@ -25,6 +25,9 @@ namespace dvars
 
 	game::dvar_t* r_fullbright = nullptr;
 
+	game::dvar_t* bg_bounces = nullptr;
+	game::dvar_t* bg_gravity = nullptr;
+
 	std::string dvar_get_vector_domain(const int components, const game::DvarLimits& domain)
 	{
 		if (domain.vector.min == -FLT_MAX)
diff --git a/src/client/game/dvars.hpp b/src/client/game/dvars.hpp
index b7dfd342..8534c176 100644
--- a/src/client/game/dvars.hpp
+++ b/src/client/game/dvars.hpp
@@ -21,6 +21,9 @@ namespace dvars
 
 	extern game::dvar_t* r_fullbright;
 
+	extern game::dvar_t* bg_bounces;
+	extern game::dvar_t* bg_gravity;
+
 	std::string dvar_get_vector_domain(const int components, const game::DvarLimits& domain);
 	std::string dvar_get_domain(const game::DvarType type, const game::DvarLimits& domain);
 	std::string dvar_get_name(const game::dvar_t* dvar);