game: support of item_invisibility

src/game/g_ai.c

@@ -434,6 +434,18 @@ visible(edict_t *self, edict_t *other)
 		return false;
 	}
 
+	/*
+	 * [Paril-KEX] bit of a hack, but we'll tweak monster-player visibility
+	 * if they have the invisibility powerup.
+	 */
+	if (other->client)
+	{
+		if (other->client->invisible_framenum > level.framenum)
+		{
+			return false;
+		}
+	}
+
 	VectorCopy(self->s.origin, spot1);
 	spot1[2] += self->viewheight;
 	VectorCopy(other->s.origin, spot2);
@@ -761,6 +773,13 @@ FindTarget(edict_t *self)
 					return false;
 				}
 			}
+
+			if ((self->enemy->client) &&
+				(self->enemy->client->invisible_framenum > level.framenum))
+			{
+				self->enemy = NULL;
+				return false;
+			}
 		}
 	}
 	else /* heardit */
@@ -870,6 +889,14 @@ M_CheckAttack(edict_t *self)
 
 	if (self->enemy->health > 0)
 	{
+		if (self->enemy->client)
+		{
+			if (self->enemy->client->invisible_framenum > level.framenum)
+			{
+				return false;
+			}
+		}
+
 		/* see if any entities are in the way of the shot */
 		VectorCopy(self->s.origin, spot1);
 		spot1[2] += self->viewheight;

src/game/g_items.c

@@ -1059,6 +1059,28 @@ Use_Invulnerability(edict_t *ent, gitem_t *item)
 					"items/protect.wav"), 1, ATTN_NORM, 0);
 }
 
+void
+Use_Invisibility(edict_t *ent, gitem_t *item)
+{
+	if (!ent || !item)
+	{
+		return;
+	}
+
+	ent->client->pers.inventory[ITEM_INDEX(item)]--;
+
+	if (ent->client->invisible_framenum > level.framenum)
+	{
+		ent->client->invisible_framenum += 300;
+	}
+	else
+	{
+		ent->client->invisible_framenum = level.framenum + 300;
+	}
+
+	gi.sound(ent, CHAN_ITEM, gi.soundindex("items/protect.wav"), 1, ATTN_NORM, 0);
+}
+
 /* ====================================================================== */
 
 void
@@ -3304,6 +3326,31 @@ static const gitem_t gameitemlist[] = {
 		"items/protect.wav items/protect2.wav items/protect4.wav"
 	},
 
+	/*
+	 * QUAKED item_invisibility (.3 .3 1) (-16 -16 -16) (16 16 16)
+	 */
+	{
+		"item_invisibility",
+		Pickup_Powerup,
+		Use_Invisibility,
+		Drop_General,
+		NULL,
+		"items/pkup.wav",
+		"models/items/cloaker/tris.md2",
+		EF_ROTATE,
+		NULL,
+		"p_cloaker",
+		"Invisibility",
+		2,
+		300,
+		NULL,
+		IT_POWERUP,
+		0,
+		NULL,
+		0,
+		NULL,
+	},
+
 	/*
 	 * QUAKED item_silencer (.3 .3 1) (-16 -16 -16) (16 16 16) TRIGGER_SPAWN
 	 */

src/game/header/local.h

@@ -1259,6 +1259,7 @@ struct gclient_s
 	/* powerup timers */
 	float quad_framenum;
 	float invincible_framenum;
+	float invisible_framenum;
 	float breather_framenum;
 	float enviro_framenum;
 

src/game/player/client.c

@@ -1125,6 +1125,7 @@ player_die(edict_t *self, edict_t *inflictor, edict_t *attacker,
 	/* remove powerups */
 	self->client->quad_framenum = 0;
 	self->client->invincible_framenum = 0;
+	self->client->invisible_framenum = 0;
 	self->client->breather_framenum = 0;
 	self->client->enviro_framenum = 0;
 	self->flags &= ~FL_POWER_ARMOR;

src/game/player/hud.c

@@ -61,6 +61,7 @@ MoveClientToIntermission(edict_t *ent)
 	/* clean up powerup info */
 	ent->client->quad_framenum = 0;
 	ent->client->invincible_framenum = 0;
+	ent->client->invisible_framenum = 0;
 	ent->client->breather_framenum = 0;
 	ent->client->enviro_framenum = 0;
 	ent->client->grenade_blew_up = false;
@@ -557,6 +558,13 @@ G_SetStats(edict_t *ent)
 		ent->client->ps.stats[STAT_TIMER] =
 			(ent->client->invincible_framenum - level.framenum) / 10;
 	}
+	else if (ent->client->invisible_framenum > level.framenum)
+	{
+		ent->client->ps.stats[STAT_TIMER_ICON] = gi.imageindex(
+				"p_cloaker");
+		ent->client->ps.stats[STAT_TIMER] =
+			(ent->client->invisible_framenum - level.framenum) / 10;
+	}
 	else if (ent->client->enviro_framenum > level.framenum)
 	{
 		ent->client->ps.stats[STAT_TIMER_ICON] = gi.imageindex("p_envirosuit");

src/game/player/view.c

@@ -665,6 +665,21 @@ SV_CalcBlend(edict_t *ent)
 			SV_AddBlend(1, 1, 0, 0.08, ent->client->ps.blend);
 		}
 	}
+	else if (ent->client->invisible_framenum > level.framenum)
+	{
+		remaining = ent->client->invisible_framenum - level.framenum;
+
+		if (remaining == 30) /* beginning to fade */
+		{
+			gi.sound(ent, CHAN_ITEM, gi.soundindex(
+							"items/protect2.wav"), 1, ATTN_NORM, 0);
+		}
+
+		if ((remaining > 30) || (remaining & 4))
+		{
+			SV_AddBlend(0.8f, 0.8f, 0.8f, 0.08f, ent->client->ps.blend);
+		}
+	}
 	else if (ent->client->enviro_framenum > level.framenum)
 	{
 		remaining = ent->client->enviro_framenum - level.framenum;