From 726332c78e05bd08f39e943fdd9b895dded43001 Mon Sep 17 00:00:00 2001
From: Marco Hladik <marco@icculus.org>
Date: Mon, 4 Oct 2021 13:22:40 +0200
Subject: [PATCH] CBaseEntity: Add Ignite(), Exinguish(), IsOnFire() methods
 according to the Source 2004 spec (controllable lifetimes etc.)

---
 src/gs-entbase/shared/baseentity.h  |  9 ++++++
 src/gs-entbase/shared/baseentity.qc | 44 +++++++++++++++++++++++++++++
 src/shared/flags.h                  |  2 +-
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/src/gs-entbase/shared/baseentity.h b/src/gs-entbase/shared/baseentity.h
index c2e24c4f..0ca62eb5 100644
--- a/src/gs-entbase/shared/baseentity.h
+++ b/src/gs-entbase/shared/baseentity.h
@@ -60,6 +60,15 @@ class CBaseEntity
 
 	string m_parent;
 
+	/* fire */
+	entity m_eBurner;
+	int m_iBurnWeapon;
+	float m_flBurnTime;
+	float m_flBurnNext;
+	nonvirtual void(entity, float, int) Ignite;
+	nonvirtual void(void) Extinguish;
+	nonvirtual int(void) IsOnFire;
+
 	/* Reliable APIs */
 	nonvirtual vector(void) GetSpawnOrigin;
 	nonvirtual vector(void) GetSpawnAngles;
diff --git a/src/gs-entbase/shared/baseentity.qc b/src/gs-entbase/shared/baseentity.qc
index ac09afa5..e2edbcd6 100644
--- a/src/gs-entbase/shared/baseentity.qc
+++ b/src/gs-entbase/shared/baseentity.qc
@@ -613,6 +613,15 @@ CBaseEntity::Input(entity eAct, string strInput, string strData)
 	case "EnableShadow":
 		effects &= ~EF_NOSHADOW;
 		break;
+	case "Ignite":
+		Ignite(eAct, 5000, 0);
+		break;
+	case "IgniteLifetime":
+		Ignite(eAct, stof(strData), 0);
+		break;
+	case "Extinguish":
+		Extinguish();
+		break;
 	default:
 		if (strData != "")
 		print(sprintf("^2%s::^3Input^7: Receives input %s from %s with data %s\n", 
@@ -770,6 +779,29 @@ CBaseEntity::Death(void)
 	
 }
 
+/* Burning, fire, flames, etc. */
+void
+CBaseEntity::Ignite(entity attacker, float flLifetime, int iWeapon)
+{
+	flags |= FL_ONFIRE;
+	m_eBurner = attacker;
+	m_iBurnWeapon = iWeapon;
+	m_flBurnTime = time + flLifetime;
+}
+void
+CBaseEntity::Extinguish(void)
+{
+	flags &= ~FL_ONFIRE;
+	m_eBurner = __NULL__;
+	m_iBurnWeapon =
+	m_flBurnTime = 0;
+}
+int
+CBaseEntity::IsOnFire(void)
+{
+	return (flags & FL_ONFIRE) ? TRUE : FALSE;
+}
+
 void
 CBaseEntity::EvaluateEntity(void)
 {
@@ -797,6 +829,18 @@ CBaseEntity::EvaluateEntity(void)
 void
 CBaseEntity::ParentUpdate(void)
 {
+	/* TODO: Move out */
+	if (flags & FL_ONFIRE) {
+		if (m_flBurnNext < time) {
+			if (time > m_flBurnTime) {
+				flags &= ~FL_ONFIRE;
+			}
+
+			Damage_Apply(this, m_eBurner, 5, m_iBurnWeapon, DMG_BURN);
+			m_flBurnNext = time + 0.5f;
+		}
+	}
+
 	EvaluateEntity();
 
 	frame1time += frametime;
diff --git a/src/shared/flags.h b/src/shared/flags.h
index af143b41..c3f3e191 100644
--- a/src/shared/flags.h
+++ b/src/shared/flags.h
@@ -39,5 +39,5 @@
 #define FL_USE_RELEASED		(1<<20)
 #define FL_NOATTACK		(1<<21)
 #define FL_ONUSABLE		(1<<22)
-#define FL_RESERVED2		(1<<23)
+#define FL_ONFIRE		(1<<23)
 #define FL_RESERVED3		(1<<15)