Half-Life: monster_zombie and monster_headcrab are attacking somewhat properly now and chase you around. Currently still working out the whole vision logic.

src/gs-entbase/server/basemonster.cpp

@@ -24,8 +24,8 @@ typedef struct
 enum
 {
 	MONSTER_IDLE,
-	MONSTER_DRAWING,
-	MONSTER_HOLSTERING,
+	MONSTER_FOLLOWING,
+	MONSTER_CHASING,
 	MONSTER_AIMING,
 	MONSTER_DEAD,
 	MONSTER_GIBBED
@@ -107,12 +107,16 @@ class CBaseMonster:CBaseEntity
 	virtual void(void) Gib;
 	virtual void(string) Sound;
 
+	/* see/hear subsystem */
+	float m_flSeeTime;
+	virtual void(void) SeeThink;
+
 	/* attack system */
 	virtual void(void) AttackDraw;
 	virtual void(void) AttackHolster;
 	virtual void(void) AttackThink;
-	virtual void(void) AttackMelee;
-	virtual void(void) AttackRanged;
+	virtual int(void) AttackMelee;
+	virtual int(void) AttackRanged;
 
 	/* sequences */
 	virtual void(void) FreeState;
@@ -177,6 +181,39 @@ CBaseMonster::IdleNoise(void)
 
 }
 
+void
+CBaseMonster::SeeThink(void)
+{
+	if (m_eEnemy)
+		return;
+
+	if (m_flSeeTime > time)
+		return;
+
+	m_flSeeTime = time + 0.25f;
+
+	for (entity w = world; (w = find(w, ::classname, "player"));) {
+
+		if (w.health <= 0)
+			continue;
+
+		/* first, is the potential enemy in our field of view? */
+		makevectors(angles);
+		vector v = normalize(w.origin - origin);
+		float flDot = v * v_forward;
+
+		if (flDot < 0.60)
+			continue;
+
+		other = world;
+		traceline(origin, w.origin, MOVE_OTHERONLY, this);
+
+		if (trace_fraction == 1.0f) {
+			m_eEnemy = w;
+			return;
+		}
+	}
+}
 void
 CBaseMonster::AttackThink(void)
 {
@@ -184,12 +221,9 @@ CBaseMonster::AttackThink(void)
 		return;
 	}
 
-	/* don't have an enemy? let's look out for one */
-	if (!m_eEnemy) {
-		/* find code here */
-		m_flAttackThink = time + 0.5f;
-		return;
-	}
+	/* reset */
+	if (m_eEnemy && m_eEnemy.health <= 0)
+		m_eEnemy = __NULL__;
 
 	/* do we have a clear shot? */
 	other = world;
@@ -197,7 +231,7 @@ CBaseMonster::AttackThink(void)
 
 	/* something is blocking us */
 	if (trace_fraction < 1.0f) {
-		m_iMState = MONSTER_HOLSTERING;
+		m_iMState = MONSTER_IDLE;
 
 		/* FIXME: This is unreliable, but unlikely that a player ever is here */
 		if (m_vecLKPos != [0,0,0]) {
@@ -206,41 +240,39 @@ CBaseMonster::AttackThink(void)
 			m_vecLKPos = [0,0,0];
 		}
 	} else {
-		if (m_iMState == MONSTER_IDLE) {
-			m_iMState = MONSTER_DRAWING;
-		} else if (m_iMState == MONSTER_DRAWING) {
 		m_iMState = MONSTER_AIMING;
-		}
 
 		/* make sure we remember the last known position. */
 		m_vecLKPos = m_eEnemy.origin;
 	}
 
 	if (m_iMState == MONSTER_AIMING) {
+		int m;
 		if (vlen(origin - m_eEnemy.origin) < 96)
-			AttackMelee();
-		else
-			AttackRanged();
-	} else if (m_iMState == MONSTER_DRAWING) {
-		AttackDraw();
-	} else if (m_iMState == MONSTER_HOLSTERING) {
-		AttackHolster();
-		m_iMState = MONSTER_IDLE;
+			m = AttackMelee();
+		else {
+			m = AttackRanged();
+
+			/* if we don't have the desired attack mode, walk */
+			if (m == FALSE)
+				m_iMState = MONSTER_CHASING;	
+
+		}
 	}
 }
 
-void
+int
 CBaseMonster::AttackMelee(void)
 {
-	dprint(sprintf("^1%s::AttackMelee: Not defined!\n", ::classname));
 	m_flAttackThink = time + 0.5f;
+	return FALSE;
 }
 
-void
+int
 CBaseMonster::AttackRanged(void)
 {
-	dprint(sprintf("^1%s::AttackRanged: Not defined!\n", ::classname));
 	m_flAttackThink = time + 0.5f;
+	return FALSE;
 }
 
 void
@@ -380,6 +412,13 @@ CBaseMonster::WalkRoute(void)
 		input_angles[1] = endangles[1];
 		input_movevalues = [m_flSequenceSpeed, 0, 0];
 	}
+
+	if (m_iMState == MONSTER_CHASING) {
+		/* we've got 'em in our sights, just need to walk closer */
+		endangles = vectoangles(m_eEnemy.origin - origin);
+		input_movevalues = [140, 0, 0];
+		input_angles[1] = endangles[1];
+	}
 }
 
 void
@@ -423,6 +462,7 @@ CBaseMonster::Physics(void)
 		input_angles = angles = v_angle = m_vecSequenceAngle;
 		SetFrame(m_flSequenceEnd);
 	} else if (movetype == MOVETYPE_WALK) {
+		SeeThink();
 		AttackThink();
 		CheckRoute();
 		WalkRoute();

src/server/valve/monster_barney.cpp

@@ -58,8 +58,8 @@ class monster_barney:CBaseNPC
 
 	virtual void(void) AttackDraw;
 	virtual void(void) AttackHolster;
-	virtual void(void) AttackMelee;
-	virtual void(void) AttackRanged;
+	virtual int(void) AttackMelee;
+	virtual int(void) AttackRanged;
 };
 
 int
@@ -94,13 +94,13 @@ monster_barney::AttackHolster(void)
 	m_flAttackThink = m_flAnimTime;
 }
 
-void
+int
 monster_barney::AttackMelee(void)
 {
-	AttackRanged();
+	return AttackRanged();
 }
 
-void
+int
 monster_barney::AttackRanged(void)
 {
 	/* visual */
@@ -110,6 +110,7 @@ monster_barney::AttackRanged(void)
 	/* functional */
 	TraceAttack_FireBullets(1, origin + [0,0,16], 8, [0.01,0,01], 2);
 	Sound_Play(this, CHAN_WEAPON, "weapon_glock.fire");
+	return TRUE;
 }
 
 void

src/server/valve/monster_headcrab.cpp

@@ -61,6 +61,8 @@ class monster_headcrab:CBaseMonster
 	virtual int(void) AnimIdle;
 	virtual int(void) AnimWalk;
 	virtual int(void) AnimRun;
+	virtual int(void) AttackRanged;
+	virtual void(void) touch;
 };
 
 int
@@ -81,6 +83,32 @@ monster_headcrab::AnimRun(void)
 	return HC_RUN;
 }
 
+int
+monster_headcrab::AttackRanged(void)
+{
+	/* visual */
+	if (random() < 0.5)
+		AnimPlay(HC_JUMP);
+	else
+		AnimPlay(HC_JUMP_VARIATION1);
+
+	m_flAttackThink = m_flAnimTime;
+	Sound_Play(this, CHAN_VOICE, "monster_headcrab.attack");
+
+	/* functional */
+	makevectors(vectoangles(m_eEnemy.origin - origin));
+	velocity = v_forward * 512 + [0,0,250];
+	return TRUE;
+}
+
+void
+monster_headcrab::touch(void)
+{
+	if (other.takedamage == DAMAGE_YES)
+	if (frame == HC_JUMP || frame == HC_JUMP_VARIATION1)
+		Damage_Apply(other, this, 500, 0, 0);
+}
+
 void
 monster_headcrab::Pain(int iHitBody)
 {
@@ -149,5 +177,6 @@ monster_headcrab::monster_headcrab(void)
 
 	base_mins = [-16,-16,0];
 	base_maxs = [16,16,36];
+	m_iAlliance = MAL_ALIEN;
 	CBaseMonster::CBaseMonster();
 }

src/server/valve/monster_zombie.cpp

@@ -80,8 +80,69 @@ class monster_zombie:CBaseMonster
 	virtual void(int) Death;
 	virtual void(void) IdleNoise;
 	virtual void(void) Respawn;
+
+	virtual int(void) AnimIdle;
+	virtual int(void) AnimWalk;
+	virtual int(void) AnimRun;
+
+	virtual int(void) AttackMelee;
+	virtual void(void) AttackFlail;
 };
 
+
+int
+monster_zombie::AnimIdle(void)
+{
+	return ZO_IDLE;
+}
+
+int
+monster_zombie::AnimWalk(void)
+{
+	return ZO_WALK;
+}
+
+int
+monster_zombie::AnimRun(void)
+{
+	return ZO_WALK;
+}
+
+int
+monster_zombie::AttackMelee(void)
+{
+	/* visual */
+	if (random() < 0.5)
+		AnimPlay(ZO_ATTACK1);
+	else
+		AnimPlay(ZO_ATTACK2);
+
+	m_flAttackThink = m_flAnimTime;
+	Sound_Play(this, CHAN_VOICE, "monster_zombie.attack");
+
+	/* functional */
+	think = AttackFlail;
+	nextthink = 0.25f;
+	return TRUE;
+}
+
+void
+monster_zombie::AttackFlail(void)
+{
+	traceline(origin, m_eEnemy.origin, FALSE, this);
+
+	if (trace_fraction >= 1.0 || trace_ent.takedamage != DAMAGE_YES) {
+		Sound_Play(this, CHAN_WEAPON, "monster_zombie.attackmiss");
+		return;
+	}
+
+	Damage_Apply(trace_ent, this, 25, 0, 0);
+	Sound_Play(this, CHAN_WEAPON, "monster_zombie.attackhit");
+
+	if (m_eEnemy.health <= 0)
+		m_eEnemy = __NULL__;
+}
+
 void
 monster_zombie::Pain(int iHitBody)
 {
@@ -160,5 +221,6 @@ monster_zombie::monster_zombie(void)
 	base_health = Skill_GetValue("zombie_health");
 	base_mins = [-16,-16,0];
 	base_maxs = [16,16,72];
+	m_iAlliance = MAL_ALIEN;
 	CBaseMonster::CBaseMonster();
 }