From 116c147135645f72e283b74f30451dd8b06e688f Mon Sep 17 00:00:00 2001
From: Skull Merlin <86374920+skkuull@users.noreply.github.com>
Date: Thu, 5 May 2022 15:25:55 +0300
Subject: [PATCH] implement pm_bouncing & g_gravity

---
 src/client/component/gameplay.cpp | 51 +++++++++++++++++++++++++++++++
 src/client/game/dvars.cpp         |  4 +++
 src/client/game/dvars.hpp         |  4 +++
 3 files changed, 59 insertions(+)

diff --git a/src/client/component/gameplay.cpp b/src/client/component/gameplay.cpp
index e9c28ea5..c02bd004 100644
--- a/src/client/component/gameplay.cpp
+++ b/src/client/component/gameplay.cpp
@@ -32,6 +32,47 @@ namespace gameplay
 				utils::hook::invoke<void>(0x1401E2D00, ps, pml);
 			}
 		}
+
+		const auto pm_bouncing_stub_mp = utils::hook::assemble([](utils::hook::assembler& a)
+		{
+			const auto no_bounce = a.newLabel();
+			const auto loc_1401EAF9D = a.newLabel();
+
+			a.push(rax);
+
+			a.mov(rax, qword_ptr(reinterpret_cast<int64_t>(&dvars::pm_bouncing)));
+			a.mov(al, byte_ptr(rax, 0x10));
+			a.cmp(byte_ptr(rbp, -0x2D), al);
+
+			a.pop(rax);
+			a.jz(no_bounce);
+			a.jmp(0x1401EB000);
+
+			a.bind(no_bounce);
+			a.cmp(dword_ptr(rsp, 0x70), 0);
+			a.jnz(loc_1401EAF9D);
+			a.jmp(0x1401EAFF1);
+
+			a.bind(loc_1401EAF9D);
+			a.jmp(0x1401EAF9D);
+		});
+
+		const auto client_end_frame_stub = utils::hook::assemble([](utils::hook::assembler& a)
+		{
+			a.push(rax);
+
+			a.mov(rax, qword_ptr(reinterpret_cast<int64_t>(&dvars::g_gravity)));
+			a.mov(eax, dword_ptr(rax, 0x10));
+			a.mov(word_ptr(rbx, 0x34), ax);
+
+			a.pop(rax);
+
+			// Game code hook skipped
+			a.mov(eax, dword_ptr(rbx, 0x494C));
+			a.mov(rdi, rcx);
+
+			a.jmp(0x140322F82);
+		});
 	}
 
 	class component final : public component_interface
@@ -49,6 +90,16 @@ namespace gameplay
 
 			utils::hook::call(0x1401E490F, pm_crashland_stub);
 			jump_enableFallDamage = dvars::register_bool("jump_enableFallDamage", true, game::DVAR_FLAG_REPLICATED, "Enable fall damage");
+
+			// Implement bouncing dvar
+			dvars::pm_bouncing = dvars::register_bool("pm_bouncing", false,
+				game::DVAR_FLAG_REPLICATED, "Enable bouncing");
+			utils::hook::jump(0x1401EAFE4, pm_bouncing_stub_mp, true);
+
+			dvars::g_gravity = dvars::register_int("g_gravity", 800, std::numeric_limits<short>::min(),
+				std::numeric_limits<short>::max(), game::DVAR_FLAG_REPLICATED, "");
+			utils::hook::jump(0x140322F72, client_end_frame_stub, true);
+			utils::hook::nop(0x140322F68, 1); // Nop skipped opcode
 		}
 	};
 }
diff --git a/src/client/game/dvars.cpp b/src/client/game/dvars.cpp
index f34fd1dd..4834bd64 100644
--- a/src/client/game/dvars.cpp
+++ b/src/client/game/dvars.cpp
@@ -27,6 +27,10 @@ namespace dvars
 	game::dvar_t* r_fullbright;
 	game::dvar_t* r_chams;
 
+	game::dvar_t* g_gravity = nullptr;
+
+	game::dvar_t* pm_bouncing = nullptr;
+
 	game::dvar_t* cg_legacyCrashHandling;
 
 	std::string dvar_get_vector_domain(const int components, const game::dvar_limits& domain)
diff --git a/src/client/game/dvars.hpp b/src/client/game/dvars.hpp
index 2d1d7673..87154b5e 100644
--- a/src/client/game/dvars.hpp
+++ b/src/client/game/dvars.hpp
@@ -30,6 +30,10 @@ namespace dvars
 	extern game::dvar_t* r_fullbright;
 	extern game::dvar_t* r_chams;
 
+	extern game::dvar_t* g_gravity;
+
+	extern game::dvar_t* pm_bouncing;
+
 	extern game::dvar_t* cg_legacyCrashHandling;
 
 	extern std::vector<dvar_info> dvar_list;