From d5d9e27ccaf4f684986a72dd1961676fa7d3e930 Mon Sep 17 00:00:00 2001
From: Diavolo <edoardo.sanguineti222@gmail.com>
Date: Wed, 22 Dec 2021 21:32:09 +0100
Subject: [PATCH 1/2] Added elevators (dvar controlled)

---
 src/client/game/dvars.cpp   |  2 ++
 src/client/game/dvars.hpp   |  2 ++
 src/client/game/structs.hpp | 19 ++++++++++++++++++-
 src/client/game/symbols.hpp |  8 +++++++-
 4 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/client/game/dvars.cpp b/src/client/game/dvars.cpp
index e2c31f6e..27c65c95 100644
--- a/src/client/game/dvars.cpp
+++ b/src/client/game/dvars.cpp
@@ -21,6 +21,8 @@ namespace dvars
 
 	game::dvar_t* cg_legacyCrashHandling;
 
+	game::dvar_t* g_enableElevators = nullptr;
+
 	std::string dvar_get_vector_domain(const int components, const game::dvar_limits& domain)
 	{
 		if (domain.vector.min == -FLT_MAX)
diff --git a/src/client/game/dvars.hpp b/src/client/game/dvars.hpp
index f65b21e5..6d9f8614 100644
--- a/src/client/game/dvars.hpp
+++ b/src/client/game/dvars.hpp
@@ -22,6 +22,8 @@ namespace dvars
 
 	extern game::dvar_t* cg_legacyCrashHandling;
 
+	extern game::dvar_t* g_enableElevators;
+
 	extern std::vector<std::string> dvar_list;
 
 	std::string dvar_get_vector_domain(const int components, const game::dvar_limits& domain);
diff --git a/src/client/game/structs.hpp b/src/client/game/structs.hpp
index 3eaf0d67..a839e160 100644
--- a/src/client/game/structs.hpp
+++ b/src/client/game/structs.hpp
@@ -915,7 +915,24 @@ namespace game
 		uint64_t streams[4];
 		const char* name;
 	};
-	
+
+	struct Bounds
+	{
+		vec3_t midPoint;
+		vec3_t halfSize;
+	};
+
+	struct pmove_t
+	{
+	};
+
+	struct trace_t
+	{
+		char __pad0[0x29];
+		bool allsolid; // Confirmed in CM_PositionTestCapsuleInTriangle
+		bool startsolid; // Confirmed in PM_JitterPoint
+	};
+
 	namespace hks
 	{
 		struct GenericChunkHeader
diff --git a/src/client/game/symbols.hpp b/src/client/game/symbols.hpp
index fea2f668..9b66eba1 100644
--- a/src/client/game/symbols.hpp
+++ b/src/client/game/symbols.hpp
@@ -45,7 +45,8 @@ namespace game
 		Dvar_RegisterString{0x618170};
 	WEAK symbol<dvar_t*(int dvarName, const char* a2, float x, float y, float z, float w, float min, float max,
 		unsigned int flags)> Dvar_RegisterVec4{0x6185F0};
-	WEAK symbol<const char* (dvar_t* dvar, void* a2, void* value)> Dvar_ValueToString{0x61B8F0};
+	WEAK symbol<const char*(const dvar_t* dvar)> Dvar_DisplayableValue{0x618EA0};
+	WEAK symbol<const char*(dvar_t* dvar, void* a2, void* value)> Dvar_ValueToString{0x61B8F0};
 	WEAK symbol<void(int hash, const char* name, const char* buffer)> Dvar_SetCommand{0x61A5C0};
 	WEAK symbol<void(const char* dvarName, const char* string, DvarSetSource source)> Dvar_SetFromStringFromSource{0x61A910};
 
@@ -122,6 +123,11 @@ namespace game
 	WEAK symbol<const char*(const char* string)> UI_SafeTranslateString{0x5A2930};
 	WEAK symbol<int(int localClientNum, const char* sound)> UI_PlayLocalSoundAlias{0x606080};
 
+	WEAK symbol<void(pmove_t* move, trace_t*, const float*, const float*,
+		const Bounds*, int, int)> PM_playerTrace{0x68F0A0};
+	WEAK symbol<void(pmove_t*, trace_t*, const float*, const float*,
+		const Bounds*, int, int)> PM_trace{0x68F1D0};
+
 	WEAK symbol<void*(jmp_buf* Buf, int Value)> longjmp{0x89EED0};
 	WEAK symbol<int(jmp_buf* Buf)> _setjmp{0x8EC2E0};
 

From 8deae532deccb9ce8c4fdda0d28351f4e6cd04f3 Mon Sep 17 00:00:00 2001
From: Diavolo <edoardo.sanguineti222@gmail.com>
Date: Wed, 22 Dec 2021 21:36:55 +0100
Subject: [PATCH 2/2] Added actual file

---
 src/client/component/gameplay.cpp | 72 +++++++++++++++++++++++++++++++
 1 file changed, 72 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..7c054bda
--- /dev/null
+++ b/src/client/component/gameplay.cpp
@@ -0,0 +1,72 @@
+#include <std_include.hpp>
+#include "loader/component_loader.hpp"
+
+#include "game/game.hpp"
+#include "game/dvars.hpp"
+
+#include <utils/hook.hpp>
+
+namespace gameplay
+{
+	namespace
+	{
+		utils::hook::detour pm_player_trace_hook;
+
+		void pm_player_trace_stub(game::pmove_t* pm, game::trace_t* trace, const float* f3,
+			const float* f4, const game::Bounds* bounds, int a6, int a7)
+		{
+			pm_player_trace_hook.invoke<void>(pm, trace, f3, f4, bounds, a6, a7);
+
+			// By setting startsolid to false we allow the player to clip through solid objects above their head
+			if (dvars::g_enableElevators->current.enabled)
+			{
+				trace->startsolid = false;
+			}
+		}
+
+		void pm_trace_stub(utils::hook::assembler& a)
+		{
+			const auto stand = a.newLabel();
+			const auto allsolid = a.newLabel();
+
+			a.call(rsi); // Game code 
+
+			a.push(rax);
+
+			a.mov(rax, qword_ptr(reinterpret_cast<int64_t>(&dvars::g_enableElevators)));
+			a.mov(al, byte_ptr(rax, 0x10));
+			a.cmp(al, 1);
+
+			a.pop(rax);
+
+			a.jz(stand); // Always stand up
+
+			a.cmp(byte_ptr(rsp, 0x89), 0); // Game code trace[0].allsolid == false
+			a.jnz(allsolid);
+
+			a.bind(stand);
+			a.jmp(0x6878CD_b);
+
+			a.bind(allsolid);
+			a.jmp(0x6878D4_b);
+		}
+	}
+
+	class component final : public component_interface
+	{
+	public:
+		void post_unpack() override
+		{
+			dvars::g_enableElevators = dvars::register_bool("g_enableElevators", false,
+				game::DvarFlags::DVAR_FLAG_NONE, true);
+
+			// Influence PM_JitterPoint code flow so the trace->startsolid checks are 'ignored' 
+			pm_player_trace_hook.create(0x068F0A0_b, &pm_player_trace_stub);
+
+			// If g_enableElevators is 1 the 'ducked' flag will always be removed from the player state
+			utils::hook::jump(0x6878C1_b, utils::hook::assemble(pm_trace_stub), true);
+		}
+	};
+}
+
+REGISTER_COMPONENT(gameplay::component)