[PlayerMovement]: Add bunny hop (#818)

src/Components/Modules/PlayerMovement.cpp

@@ -15,6 +15,8 @@ namespace Components
 	const Game::dvar_t* PlayerMovement::PlayerSpectateSpeedScale;
 	const Game::dvar_t* PlayerMovement::BGBounces;
 	const Game::dvar_t* PlayerMovement::BGBouncesAllAngles;
+	const Game::dvar_t* PlayerMovement::BGBunnyHopSlowdown;
+	const Game::dvar_t* PlayerMovement::BGBunnyHopAuto;
 	const Game::dvar_t* PlayerMovement::PlayerDuckedSpeedScale;
 	const Game::dvar_t* PlayerMovement::PlayerProneSpeedScale;
 
@@ -217,6 +219,38 @@ namespace Components
 		}
 	}
 
+	void PlayerMovement::PM_CrashLand_Stub(const float* v, float scale, const float* result)
+	{
+		if (!BGBunnyHopSlowdown->current.enabled)
+		{
+			Utils::Hook::Call<void(const float*, float, const float*)>(0x4C12B0)(v, scale, result);
+		}
+	}
+
+	__declspec(naked) void PlayerMovement::Jump_Check_Stub()
+	{
+		using namespace Game;
+
+		__asm
+		{
+			push eax
+			mov eax, BGBunnyHopAuto
+			cmp byte ptr [eax + 0x10], 1
+			pop eax
+
+			je autoHop
+
+			// Game's code
+			test dword ptr [ebp + 0x30], CMD_BUTTON_UP
+			push 0x4E9890
+			ret
+
+		autoHop:
+			push 0x4E989F
+			ret
+		}
+	}
+
 	void PlayerMovement::GScr_IsSprinting(const Game::scr_entref_t entref)
 	{
 		const auto* client = Game::GetEntity(entref)->client;
@@ -257,6 +291,12 @@ namespace Components
 			3.0f, 0.001f, 1000.0f, Game::DVAR_CHEAT | Game::DVAR_CODINFO,
 			"The speed at which noclip camera moves");
 
+		BGBunnyHopSlowdown = Game::Dvar_RegisterBool("bg_bunnyHopSlowdown",
+			false, Game::DVAR_CODINFO, "Toggle landing slowdown");
+
+		BGBunnyHopAuto = Game::Dvar_RegisterBool("bg_bunnyHopAuto",
+			false, Game::DVAR_CODINFO, "Constantly jump when holding space");
+
 		BGRocketJump = Dvar::Register<bool>("bg_rocketJump",
 			false, Game::DVAR_CODINFO, "Enable CoD4 rocket jumps");
 
@@ -330,6 +370,9 @@ namespace Components
 		Utils::Hook(0x573F39, PM_PlayerTraceStub, HOOK_CALL).install()->quick();
 		Utils::Hook(0x573E93, PM_PlayerTraceStub, HOOK_CALL).install()->quick();
 
+		Utils::Hook(0x570020, PM_CrashLand_Stub, HOOK_CALL).install()->quick(); // Vec3Scale
+		Utils::Hook(0x4E9889, Jump_Check_Stub, HOOK_JUMP).install()->quick();
+
 		GSC::Script::AddMethod("IsSprinting", GScr_IsSprinting);
 
 		RegisterMovementDvars();

src/Components/Modules/PlayerMovement.hpp

@@ -23,6 +23,8 @@ namespace Components
 		static const Game::dvar_t* PlayerSpectateSpeedScale;
 		static const Game::dvar_t* BGBounces;
 		static const Game::dvar_t* BGBouncesAllAngles;
+		static const Game::dvar_t* BGBunnyHopSlowdown;
+		static const Game::dvar_t* BGBunnyHopAuto;
 		static const Game::dvar_t* PlayerDuckedSpeedScale;
 		static const Game::dvar_t* PlayerProneSpeedScale;
 		
@@ -45,6 +47,9 @@ namespace Components
 		static int StuckInClient_Hk(Game::gentity_s* self);
 		static void CM_TransformedCapsuleTrace_Hk(Game::trace_t* results, const float* start, const float* end, const Game::Bounds* bounds, const Game::Bounds* capsule, int contents, const float* origin, const float* angles);
 
+		static void PM_CrashLand_Stub(const float* v, float scale, const float* result);
+		static void Jump_Check_Stub();
+
 		static void GScr_IsSprinting(Game::scr_entref_t entref);
 
 		static const Game::dvar_t* Dvar_RegisterSpectateSpeedScale(const char* dvarName, float value, float min, float max, unsigned __int16 flags, const char* description);