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engines/scumm/he/moonbase/ai_tree.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "scumm/he/intern_he.h"
+
+#include "scumm/he/moonbase/moonbase.h"
+#include "scumm/he/moonbase/ai_tree.h"
+#include "scumm/he/moonbase/ai_main.h"
+
+namespace Scumm {
+
+static int compareTreeNodes(const void *a, const void *b) {
+	if (((const TreeNode *)a)->value < ((const TreeNode *)b)->value)
+		return -1;
+	else if (((const TreeNode *)a)->value > ((const TreeNode *)b)->value)
+		return 1;
+	else
+		return 0;
+}
+
+Tree::Tree(AI *ai) : _ai(ai) {
+	pBaseNode = new Node;
+	_maxDepth = MAX_DEPTH;
+	_maxNodes = MAX_NODES;
+	_currentNode = nullptr;
+	_currentChildIndex = 0;
+
+	_currentMap = new Common::SortedArray<TreeNode *>(compareTreeNodes);
+}
+
+Tree::Tree(IContainedObject *contents, AI *ai) : _ai(ai) {
+	pBaseNode = new Node;
+	pBaseNode->setContainedObject(contents);
+	_maxDepth = MAX_DEPTH;
+	_maxNodes = MAX_NODES;
+	_currentNode = nullptr;
+	_currentChildIndex = 0;
+
+	_currentMap = new Common::SortedArray<TreeNode *>(compareTreeNodes);
+}
+
+Tree::Tree(IContainedObject *contents, int maxDepth, AI *ai) : _ai(ai) {
+	pBaseNode = new Node;
+	pBaseNode->setContainedObject(contents);
+	_maxDepth = maxDepth;
+	_maxNodes = MAX_NODES;
+	_currentNode = nullptr;
+	_currentChildIndex = 0;
+
+	_currentMap = new Common::SortedArray<TreeNode *>(compareTreeNodes);
+}
+
+Tree::Tree(IContainedObject *contents, int maxDepth, int maxNodes, AI *ai) : _ai(ai) {
+	pBaseNode = new Node;
+	pBaseNode->setContainedObject(contents);
+	_maxDepth = maxDepth;
+	_maxNodes = maxNodes;
+	_currentNode = nullptr;
+	_currentChildIndex = 0;
+
+	_currentMap = new Common::SortedArray<TreeNode *>(compareTreeNodes);
+}
+
+void Tree::duplicateTree(Node *sourceNode, Node *destNode) {
+	Common::Array<Node *> vUnvisited = sourceNode->getChildren();
+
+	while (vUnvisited.size()) {
+		Node *newNode = new Node(*(vUnvisited.end()));
+		newNode->setParent(destNode);
+		(destNode->getChildren()).push_back(newNode);
+		duplicateTree(*(vUnvisited.end()), newNode);
+		vUnvisited.pop_back();
+	}
+}
+
+Tree::Tree(const Tree *sourceTree, AI *ai) : _ai(ai) {
+	pBaseNode = new Node(sourceTree->getBaseNode());
+	_maxDepth = sourceTree->getMaxDepth();
+	_maxNodes = sourceTree->getMaxNodes();
+	_currentMap = new Common::SortedArray<TreeNode *>(compareTreeNodes);
+	_currentNode = nullptr;
+	_currentChildIndex = 0;
+
+	duplicateTree(sourceTree->getBaseNode(), pBaseNode);
+}
+
+Tree::~Tree() {
+	// Delete all nodes
+	Node *pNodeItr = pBaseNode;
+
+	// Depth first traversal of nodes to delete them
+	while (pNodeItr != nullptr) {
+		// If any children are left, move to one of them
+		if (!(pNodeItr->getChildren().empty())) {
+			pNodeItr = pNodeItr->popChild();
+		} else {
+			// Delete this node, and move up to the parent for further processing
+			Node *pTemp = pNodeItr;
+			pNodeItr = pNodeItr->getParent();
+			delete pTemp;
+			pTemp = nullptr;
+		}
+	}
+
+	delete _currentMap;
+}
+
+Node *Tree::aStarSearch() {
+	Common::SortedArray<TreeNode *> mmfpOpen(compareTreeNodes);
+
+	Node *currentNode = nullptr;
+	float currentT;
+
+	Node *retNode = nullptr;
+
+	float temp = pBaseNode->getContainedObject()->calcT();
+
+	if (static_cast<int>(temp) != SUCCESS) {
+		mmfpOpen.insert(new TreeNode(pBaseNode->getObjectT(), pBaseNode));
+
+		while (mmfpOpen.size() && (retNode == nullptr)) {
+			currentNode = mmfpOpen.front()->node;
+			mmfpOpen.erase(mmfpOpen.begin());
+
+			if ((currentNode->getDepth() < _maxDepth) && (Node::getNodeCount() < _maxNodes)) {
+				// Generate nodes
+				Common::Array<Node *> vChildren = currentNode->getChildren();
+
+				for (Common::Array<Node *>::iterator i = vChildren.begin(); i != vChildren.end(); i++) {
+					IContainedObject *pTemp = (*i)->getContainedObject();
+					currentT = pTemp->calcT();
+
+					if (currentT == SUCCESS)
+						retNode = *i;
+					else
+						mmfpOpen.insert(new TreeNode(currentT, (*i)));
+				}
+			} else {
+				retNode = currentNode;
+			}
+		}
+	} else {
+		retNode = pBaseNode;
+	}
+
+	return retNode;
+}
+
+
+Node *Tree::aStarSearch_singlePassInit() {
+	Node *retNode = nullptr;
+
+	_currentChildIndex = 1;
+
+	float temp = pBaseNode->getContainedObject()->calcT();
+
+	if (static_cast<int>(temp) != SUCCESS) {
+		_currentMap->insert(new TreeNode(pBaseNode->getObjectT(), pBaseNode));
+	} else {
+		retNode = pBaseNode;
+	}
+
+	return retNode;
+}
+
+Node *Tree::aStarSearch_singlePass() {
+	float currentT = 0.0;
+	Node *retNode = nullptr;
+
+	static int maxTime = 0;
+
+	if (_currentChildIndex == 1) {
+		maxTime = _ai->getPlayerMaxTime();
+	}
+
+	if (_currentChildIndex) {
+		if (!(_currentMap->size())) {
+			retNode = _currentNode;
+			return retNode;
+		}
+
+		_currentNode = _currentMap->front()->node;
+		_currentMap->erase(_currentMap->begin());
+	}
+
+	if ((_currentNode->getDepth() < _maxDepth) && (Node::getNodeCount() < _maxNodes) && ((!maxTime) || (_ai->getTimerValue(3) < maxTime))) {
+		// Generate nodes
+		_currentChildIndex = _currentNode->generateChildren();
+
+		if (_currentChildIndex) {
+			Common::Array<Node *> vChildren = _currentNode->getChildren();
+
+			if (!vChildren.size() && !_currentMap->size()) {
+				_currentChildIndex = 0;
+				retNode = _currentNode;
+			}
+
+			for (Common::Array<Node *>::iterator i = vChildren.begin(); i != vChildren.end(); i++) {
+				IContainedObject *pTemp = (*i)->getContainedObject();
+				currentT = pTemp->calcT();
+
+				if (currentT == SUCCESS) {
+					retNode = *i;
+					i = vChildren.end() - 1;
+				} else {
+					_currentMap->insert(new TreeNode(currentT, (*i)));
+				}
+			}
+
+			if (!(_currentMap->size()) && (currentT != SUCCESS)) {
+				assert(_currentNode != nullptr);
+				retNode = _currentNode;
+			}
+		}
+	} else {
+		retNode = _currentNode;
+	}
+
+	return retNode;
+}
+
+int Tree::IsBaseNode(Node *thisNode) {
+	return (thisNode == pBaseNode);
+}
+
+} // End of namespace Scumm