From 2c59d8a6466856f419a41a8d349e5eb281b0e1c5 Mon Sep 17 00:00:00 2001
From: Skull Merlin <86374920+skkuull@users.noreply.github.com>
Date: Mon, 9 May 2022 02:04:45 +0300
Subject: [PATCH] elevators but not yet

---
 src/client/component/gameplay.cpp | 50 ++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/client/component/gameplay.cpp b/src/client/component/gameplay.cpp
index 9a7c4f83..f506ee13 100644
--- a/src/client/component/gameplay.cpp
+++ b/src/client/component/gameplay.cpp
@@ -117,6 +117,46 @@ namespace gameplay
 
 			a.jmp(0x140322F82);
 		});
+
+		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(qword_ptr(r10, r15)); // 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.and_(dword_ptr(rbx, 0x54), 0xFFFFFFFD);
+			a.jmp(0x1401E1CDF);
+
+			a.bind(allsolid);
+			a.jmp(0x1401E1CE1);
+		}
 	}
 
 	class component final : public component_interface
@@ -133,6 +173,15 @@ namespace gameplay
 				return;
 			}
 
+#ifdef DEBUG
+			// Influence PM_JitterPoint code flow so the trace->startsolid checks are 'ignored' 
+			pm_player_trace_hook.create(0x1401E8BE0, &pm_player_trace_stub);
+
+			// If g_enableElevators is 1 the 'ducked' flag will always be removed from the player state
+			utils::hook::jump(0x1401E1CD1, utils::hook::assemble(pm_trace_stub), true);
+			dvars::g_enableElevators = dvars::register_bool("g_enableElevators", false, game::DvarFlags::DVAR_FLAG_NONE, "");
+#endif
+
 			auto* timescale = dvars::register_float("timescale", 1.0f, 0.1f, 50.0f, game::DVAR_FLAG_REPLICATED, "Changes Timescale of the game");
 			utils::hook::inject(0x1400D89A4, &timescale->current.value);
 			utils::hook::inject(0x1400DA9D1, &timescale->current.value);
@@ -144,7 +193,6 @@ namespace gameplay
 			utils::hook::inject(0x1400DBE72, &timescale->current.value);
 			utils::hook::inject(0x1400DBE9C, &timescale->current.value);
 
-
 			utils::hook::call(0x1401E8830, jump_apply_slowdown_stub);
 			jump_slowDownEnable = dvars::register_bool("jump_slowDownEnable", true, game::DVAR_FLAG_REPLICATED, "Slow player movement after jumping");