From 761c90e62a1c7f01d38420834119a4fa697a3950 Mon Sep 17 00:00:00 2001
From: Nipun Garg
Date: Thu, 27 Jun 2019 22:29:49 +0530
Subject: HDB: Add functions related to _callbacks

---
 engines/hdb/ai-lists.cpp | 29 +++++++++++++++++++++++++++++
 engines/hdb/ai.h         |  2 ++
 2 files changed, 31 insertions(+)

diff --git a/engines/hdb/ai-lists.cpp b/engines/hdb/ai-lists.cpp
index 389b3ab880..a8598863a2 100644
--- a/engines/hdb/ai-lists.cpp
+++ b/engines/hdb/ai-lists.cpp
@@ -434,6 +434,35 @@ bool AI::autoActive(int x, int y) {
 	return false;
 }
 
+CallbackDef allCallbacks[] = {
+	{NO_FUNCTION,	NULL},
+	{AI_BARREL_EXPLOSION_END,		aiBarrelExplosionEnd},
+	{CALLBACK_DOOR_OPEN_CLOSE,		callbackDoorOpenClose},
+	{CALLBACK_AUTODOOR_OPEN_CLOSE,	callbackAutoDoorOpenClose},
+	{CALLBACK_END,					NULL}
+};
+
+void AI::addCallback(CallbackType type, int x, int y, int delay) {
+	for(int i= kMaxCallbacks; i >= 0; i--)
+		if (_callbacks[i].type == NO_FUNCTION) {
+			_callbacks[i].type = type;
+			_callbacks[i].x = x;
+			_callbacks[i].y = y;
+			_callbacks[i].delay = delay;
+			return;
+		}
+}
+
+void AI::processCallbackList() {
+	for (int i = 0; i < kMaxCallbacks; i++)
+		if (_callbacks[i].type != NO_FUNCTION) {
+			allCallbacks[_callbacks[i].type].function(_callbacks[i].x, _callbacks[i].y);
+			_callbacks[i].type = NO_FUNCTION;
+			_callbacks[i].x = _callbacks[i].y = 0;
+			return;
+		}
+}
+
 void AI::addToLuaList(int x, int y, int value1, int value2, char *luaFuncInit, char *luaFuncAction, char *luaFuncUse) {
 	for (int i = 0; i < kMaxLuaEnts; i++) {
 		if (!_luaList[i].luaFuncInit[0] && !_luaList[i].luaFuncAction[0] && !_luaList[i].luaFuncUse[0]) {
diff --git a/engines/hdb/ai.h b/engines/hdb/ai.h
index 6f5653ad6c..690e868fa7 100644
--- a/engines/hdb/ai.h
+++ b/engines/hdb/ai.h
@@ -752,6 +752,8 @@ public:
 	bool activateAction(AIEntity *e, int x, int y, int targetX, int targetY);
 	bool checkAutoList(AIEntity *e, int x, int y);
 	bool autoActive(int x, int y);
+	void addCallback(CallbackType type, int x, int y, int delay);
+	void processCallbackList();
 	void addToLuaList(int x, int y, int value1, int value2, char *luaFuncInit, char *luaFuncAction, char *luaFuncUse);
 	bool checkLuaList(AIEntity *e, int x, int y);
 	bool luaExistAtXY(int x, int y);
-- 
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