From f9eb989b3baf02e094cb23aa63a3c88ef064ffba Mon Sep 17 00:00:00 2001
From: Kawe Mazidjatari <48657826+Mauler125@users.noreply.github.com>
Date: Sun, 4 Aug 2024 17:25:38 +0200
Subject: [PATCH] Game: add method for calculating zoom FOV interp

---
 src/game/CMakeLists.txt                |  2 ++
 src/game/client/r1/c_weapon_x.cpp      |  6 ++++++
 src/game/client/r1/c_weapon_x.h        |  5 +++++
 src/game/server/r1/weapon_x.cpp        |  6 ++++++
 src/game/server/r1/weapon_x.h          |  4 ++++
 src/game/shared/r1/weapon_playerdata.h | 20 +++++++++++++++++++-
 6 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 src/game/client/r1/c_weapon_x.cpp
 create mode 100644 src/game/server/r1/weapon_x.cpp

diff --git a/src/game/CMakeLists.txt b/src/game/CMakeLists.txt
index 86b069b3..6cc44afb 100644
--- a/src/game/CMakeLists.txt
+++ b/src/game/CMakeLists.txt
@@ -153,6 +153,7 @@ add_sources( SOURCE_GROUP "Player"
 )
 
 add_sources( SOURCE_GROUP "Weapon"
+    "server/r1/weapon_x.cpp"
     "server/r1/weapon_x.h"
 )
 
@@ -219,6 +220,7 @@ add_sources( SOURCE_GROUP "Player"
 )
 
 add_sources( SOURCE_GROUP "Weapon"
+    "client/r1/c_weapon_x.cpp"
     "client/r1/c_weapon_x.h"
 )
 
diff --git a/src/game/client/r1/c_weapon_x.cpp b/src/game/client/r1/c_weapon_x.cpp
new file mode 100644
index 00000000..8ed6219c
--- /dev/null
+++ b/src/game/client/r1/c_weapon_x.cpp
@@ -0,0 +1,6 @@
+#include "c_weapon_x.h"
+
+float C_WeaponX::GetZoomFOVInterpAmount(const float curTime) const
+{
+	return m_playerData.GetZoomFOVInterpAmount(curTime);
+}
diff --git a/src/game/client/r1/c_weapon_x.h b/src/game/client/r1/c_weapon_x.h
index 042510d7..1fc3248e 100644
--- a/src/game/client/r1/c_weapon_x.h
+++ b/src/game/client/r1/c_weapon_x.h
@@ -8,6 +8,11 @@
 
 class C_WeaponX : C_BaseAnimating
 {
+public:
+	float GetZoomFOVInterpAmount(const float curTime) const;
+	inline bool HasTargetZoomFOV() { return m_playerData.GetTargetZoomFOV() == *(float*)&m_modVars[3120]; }
+
+private:
 	EHANDLE m_weaponOwner;
 	float m_lastPrimaryAttack;
 	float m_nextReadyTime;
diff --git a/src/game/server/r1/weapon_x.cpp b/src/game/server/r1/weapon_x.cpp
new file mode 100644
index 00000000..26253f9e
--- /dev/null
+++ b/src/game/server/r1/weapon_x.cpp
@@ -0,0 +1,6 @@
+#include "weapon_x.h"
+
+float CWeaponX::GetZoomFOVInterpAmount(const float curTime) const
+{
+	return m_playerData.GetZoomFOVInterpAmount(curTime);
+}
diff --git a/src/game/server/r1/weapon_x.h b/src/game/server/r1/weapon_x.h
index 2922d173..91c029e6 100644
--- a/src/game/server/r1/weapon_x.h
+++ b/src/game/server/r1/weapon_x.h
@@ -14,6 +14,10 @@
 
 class CWeaponX : CBaseAnimating
 {
+public:
+	float GetZoomFOVInterpAmount(const float curTime) const;
+
+private:
 	EHANDLE m_weaponOwner;
 	float m_lastPrimaryAttack;
 	float m_nextReadyTime;
diff --git a/src/game/shared/r1/weapon_playerdata.h b/src/game/shared/r1/weapon_playerdata.h
index 935b4572..470732df 100644
--- a/src/game/shared/r1/weapon_playerdata.h
+++ b/src/game/shared/r1/weapon_playerdata.h
@@ -3,6 +3,11 @@
 
 class WeaponPlayerData
 {
+public:
+	inline float GetZoomFOVInterpAmount(const float curTime) const;
+	inline float GetTargetZoomFOV() const { return m_targetZoomFOV; }
+
+private:
 	void* __vftable;
 	float m_moveSpread;
 	float m_spreadStartTime;
@@ -70,8 +75,21 @@ class WeaponPlayerData
 	int m_charmAttachment;
 	int m_charmScriptIndex;
 };
-
 // Client's class is identical.
 typedef WeaponPlayerData WeaponPlayerData_Client;
 
+
+float WeaponPlayerData::GetZoomFOVInterpAmount(const float curTime) const
+{
+	const float zoomLerpTime = m_zoomFOVLerpTime;
+
+	if (zoomLerpTime <= 0.0f)
+		return 1.0f;
+
+	const float endLerptime = m_zoomFOVLerpEndTime;
+	const float finalLerpTime = Min(Max((curTime - (endLerptime - zoomLerpTime)) / zoomLerpTime, 0.0f), 1.0f);
+
+	return (3.0f - (finalLerpTime + finalLerpTime)) * (finalLerpTime * finalLerpTime);
+}
+
 #endif // SHARED_WEAPON_PLAYERDATA_H