Initial commit

engines/pegasus/ai/ai_action.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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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 "pegasus/pegasus.h"
+#include "pegasus/ai/ai_action.h"
+#include "pegasus/ai/ai_area.h"
+
+namespace Pegasus {
+
+AICompoundAction::~AICompoundAction() {
+	for (AIActionList::iterator it = _compoundActions.begin(); it != _compoundActions.end(); it++)
+		delete *it;
+}
+
+void AICompoundAction::performAIAction(AIRule *rule) {
+	for (AIActionList::iterator it = _compoundActions.begin(); it != _compoundActions.end(); it++)
+		(*it)->performAIAction(rule);
+}
+
+AIPlayMessageAction::AIPlayMessageAction(const Common::Path &movieName, bool keepLastFrame, const InputBits interruptionFilter) {
+	_movieName = movieName;
+	_keepLastFrame = keepLastFrame;
+	_interruptionFilter = interruptionFilter;
+}
+
+void AIPlayMessageAction::performAIAction(AIRule *) {
+	if (g_AIArea && g_vm->isChattyAI()) {
+		g_AIArea->checkMiddleArea();
+		g_AIArea->playAIMovie(kRightAreaSignature, _movieName, _keepLastFrame, _interruptionFilter);
+	}
+}
+
+AIStartTimerAction::AIStartTimerAction(AITimerCondition *timerCondition) {
+	_timerCondition = timerCondition;
+}
+
+void AIStartTimerAction::performAIAction(AIRule *) {
+	_timerCondition->startTimer();
+}
+
+AIActivateRuleAction::AIActivateRuleAction(AIRule *rule) {
+	_rule = rule;
+}
+
+void AIActivateRuleAction::performAIAction(AIRule *) {
+	_rule->activateRule();
+}
+
+AIDeactivateRuleAction::AIDeactivateRuleAction(AIRule *rule) {
+	_rule = rule;
+}
+
+void AIDeactivateRuleAction::performAIAction(AIRule *) {
+	_rule->deactivateRule();
+}
+
+} // End of namespace Pegasus

engines/pegasus/ai/ai_action.h

@@ -0,0 +1,135 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef PEGASUS_AI_AIACTION_H
+#define PEGASUS_AI_AIACTION_H
+
+#include "common/list.h"
+
+#include "pegasus/input.h"
+#include "pegasus/types.h"
+
+namespace Pegasus {
+
+class AIRule;
+class AITimerCondition;
+
+/////////////////////////////////////////////
+//
+// AIAction
+
+class AIAction {
+friend class AIRule;
+public:
+	AIAction() { _actionCount = 1; }
+	virtual ~AIAction() {}
+
+	virtual void performAIAction(AIRule *) = 0;
+
+	void setActionCount(const uint32 count) { _actionCount = count; }
+
+protected:
+	uint32 _actionCount;
+};
+
+typedef Common::List<AIAction *> AIActionList;
+
+/////////////////////////////////////////////
+//
+// AICompoundAction
+
+class AICompoundAction : public AIAction {
+public:
+	AICompoundAction() {}
+	~AICompoundAction() override;
+
+	void addAction(AIAction *action) { _compoundActions.push_back(action); }
+
+	void performAIAction(AIRule *) override;
+
+protected:
+	AIActionList _compoundActions;
+};
+
+/////////////////////////////////////////////
+//
+// AIPlayMessageAction
+
+class AIPlayMessageAction : public AIAction {
+public:
+	AIPlayMessageAction(const Common::Path &movieName, bool keepLastFrame, const InputBits = kWarningInterruption);
+
+	void performAIAction(AIRule *) override;
+
+protected:
+	Common::Path _movieName;
+	InputBits _interruptionFilter;
+	bool _keepLastFrame;
+};
+
+/////////////////////////////////////////////
+//
+// AIStartTimerAction
+
+class AIStartTimerAction : public AIAction {
+public:
+	AIStartTimerAction(AITimerCondition *);
+
+	void performAIAction(AIRule *) override;
+
+protected:
+	AITimerCondition *_timerCondition;
+};
+
+/////////////////////////////////////////////
+//
+// AIActivateRuleAction
+
+class AIActivateRuleAction : public AIAction {
+public:
+	AIActivateRuleAction(AIRule *);
+
+	void performAIAction(AIRule *) override;
+
+protected:
+	AIRule *_rule;
+};
+
+/////////////////////////////////////////////
+//
+// AIDeactivateRuleAction
+
+class AIDeactivateRuleAction : public AIAction {
+public:
+	AIDeactivateRuleAction(AIRule *rule);
+
+	void performAIAction(AIRule *) override;
+
+protected:
+	AIRule *_rule;
+};
+
+} // End of namespace Pegasus
+
+#endif

engines/pegasus/ai/ai_area.cpp

@@ -0,0 +1,628 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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 "common/memstream.h"
+
+#include "pegasus/cursor.h"
+#include "pegasus/pegasus.h"
+#include "pegasus/ai/ai_area.h"
+#include "pegasus/items/biochips/aichip.h"
+#include "pegasus/items/biochips/arthurchip.h"
+#include "pegasus/items/biochips/biochipitem.h"
+#include "pegasus/items/biochips/opticalchip.h"
+#include "pegasus/items/biochips/pegasuschip.h"
+#include "pegasus/items/inventory/airmask.h"
+#include "pegasus/items/inventory/inventoryitem.h"
+
+namespace Pegasus {
+
+AIArea *g_AIArea = nullptr;
+
+AIArea::AIArea(InputHandler *nextHandler) : InputHandler(nextHandler), _leftAreaMovie(kAILeftAreaID),
+		_middleAreaMovie(kAIMiddleAreaID), _rightAreaMovie(kAIRightAreaID), _AIMovie(kAIMovieID) {
+	g_AIArea = this;
+	_leftAreaOwner = kNoClientSignature;
+	_middleAreaOwner = kNoClientSignature;
+	_rightAreaOwner = kNoClientSignature;
+	_leftInventoryTime = 0xffffffff;
+	_middleInventoryTime = 0xffffffff;
+	_middleBiochipTime = 0xffffffff;
+	_rightBiochipTime = 0xffffffff;
+	_lockCount = 0;
+	g_vm->requestToggle(false);
+	startIdling();
+}
+
+AIArea::~AIArea() {
+	if (_middleAreaOwner == kBiochipSignature) {
+		BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+		if (currentBiochip && currentBiochip->isSelected())
+			currentBiochip->giveUpSharedArea();
+	} else if (_middleAreaOwner == kInventorySignature) {
+		InventoryItem *currentItem = g_vm->getCurrentInventoryItem();
+		if (currentItem && currentItem->isSelected())
+			currentItem->giveUpSharedArea();
+	}
+
+	stopIdling();
+
+	for (AIRuleList::iterator it = _AIRules.begin(); it != _AIRules.end(); it++)
+		delete *it;
+
+	g_AIArea = nullptr;
+}
+
+// Save last state of AI rules...
+void AIArea::saveAIState() {
+	delete g_vm->_aiSaveStream;
+
+	Common::MemoryWriteStreamDynamic out(DisposeAfterUse::NO);
+	writeAIRules(&out);
+
+	g_vm->_aiSaveStream = new Common::MemoryReadStream(out.getData(), out.size(), DisposeAfterUse::YES);
+}
+
+void AIArea::restoreAIState() {
+	if (g_vm->_aiSaveStream)
+		readAIRules(g_vm->_aiSaveStream);
+}
+
+void AIArea::writeAIRules(Common::WriteStream *stream) {
+	_AIRules.writeAIRules(stream);
+}
+
+void AIArea::readAIRules(Common::ReadStream *stream) {
+	_AIRules.readAIRules(stream);
+}
+
+void AIArea::initAIArea() {
+	allocateSurface(Common::Rect(0, 0, 384, 96));
+
+	_leftAreaMovie.shareSurface(this);
+	_leftAreaMovie.initFromMovieFile("Images/Items/Left Area Movie");
+	_leftAreaMovie.moveElementTo(kAILeftAreaLeft, kAILeftAreaTop);
+	_leftAreaMovie.setDisplayOrder(kAILeftAreaOrder);
+	_leftAreaMovie.startDisplaying();
+	_leftAreaMovie.setVolume(g_vm->getSoundFXLevel());
+
+	_middleAreaMovie.shareSurface(this);
+	_middleAreaMovie.initFromMovieFile("Images/Items/Middle Area Movie");
+	_middleAreaMovie.moveElementTo(kAIMiddleAreaLeft, kAIMiddleAreaTop);
+	_middleAreaMovie.moveMovieBoxTo(kAIMiddleAreaLeft - kAILeftAreaLeft, 0);
+	_middleAreaMovie.setDisplayOrder(kAIMiddleAreaOrder);
+	_middleAreaMovie.startDisplaying();
+	_middleAreaMovie.setVolume(g_vm->getSoundFXLevel());
+
+	_rightAreaMovie.shareSurface(this);
+	_rightAreaMovie.initFromMovieFile("Images/Items/Right Area Movie");
+	_rightAreaMovie.moveElementTo(kAIRightAreaLeft, kAIRightAreaTop);
+	_rightAreaMovie.moveMovieBoxTo(kAIRightAreaLeft - kAILeftAreaLeft, 0);
+	_rightAreaMovie.setDisplayOrder(kAIRightAreaOrder);
+	_rightAreaMovie.startDisplaying();
+	_rightAreaMovie.setVolume(g_vm->getSoundFXLevel());
+
+	_AIMovie.setDisplayOrder(kAIMovieOrder);
+}
+
+void AIArea::setAIVolume(const uint16 volume) {
+	_leftAreaMovie.setVolume(volume);
+	_middleAreaMovie.setVolume(volume);
+	_rightAreaMovie.setVolume(volume);
+}
+
+// There are only so many legal combinations of client/area.
+// Here is the list of supported pairs:
+//      kInventorySignature     kLeftAreaSignature
+//      kInventorySignature     kMiddleAreaSignature
+//      kBiochipSignature       kMiddleAreaSignature
+//      kBiochipSignature       kRightAreaSignature
+//      kAISignature            kLeftAreaSignature
+// Further, the kAISignature never sets a static frame time in the left area,
+// but only plays a sequence.
+
+// If this function is called while a sequence is playing, it will just "remember"
+// the time value, so that when the sequence finishes, the new time is asserted.
+
+void AIArea::setAIAreaToTime(const LowerClientSignature client, const LowerAreaSignature area, const TimeValue time) {
+	switch (area) {
+	case kLeftAreaSignature:
+		// Only support kInventorySignature client, since AI never calls SetAIAreaToTime.
+		_leftAreaMovie.setSegment(0, _leftAreaMovie.getDuration());
+
+		if (time == 0xffffffff) {
+			_leftAreaMovie.hide();
+			_leftAreaOwner = kNoClientSignature;
+		} else {
+			setLeftMovieTime(time);
+		}
+		break;
+	case kMiddleAreaSignature:
+		// Only support kInventorySignature and kBiochipSignature clients.
+		_middleAreaMovie.stop();
+		_middleAreaMovie.setFlags(0);
+		_middleAreaMovie.setSegment(0, _middleAreaMovie.getDuration());
+
+		if (time == 0xffffffff) {
+			if (client == kInventorySignature) {
+				if (_middleBiochipTime != 0xffffffff) {
+					setMiddleMovieTime(kBiochipSignature, _middleBiochipTime);
+				} else {
+					_middleAreaMovie.hide();
+					_middleAreaOwner = kNoClientSignature;
+				}
+			} else {	// client == kBiochipSignature
+				if (_middleInventoryTime != 0xffffffff) {
+					setMiddleMovieTime(kInventorySignature, _middleInventoryTime);
+				} else {
+					_middleAreaMovie.hide();
+					_middleAreaOwner = kNoClientSignature;
+				}
+			}
+		} else {
+			setMiddleMovieTime(client, time);
+		}
+		break;
+	case kRightAreaSignature:
+		// Only support kBiochipSignature client.
+		_rightAreaMovie.setSegment(0, _rightAreaMovie.getDuration());
+
+		if (time == 0xffffffff) {
+			_rightAreaMovie.hide();
+			_rightAreaOwner = kNoClientSignature;
+		} else {
+			setRightMovieTime(time);
+		}
+		break;
+	default:
+		break;
+	}
+}
+
+// Plays a sequence on an area. When the sequence ends, the previous image
+// is restored.
+// Also, is input disabled or not?
+// Easy answer: yes.
+
+// There are only so many legal combinations of client/area.
+// Here is the list of supported pairs:
+//     kBiochipSignature        kMiddleAreaSignature
+// 	   kBiochipSignature        kRightAreaSignature
+// 	   kInventorySignature      kMiddleAreaSignature
+
+void AIArea::playAIAreaSequence(const LowerClientSignature, const LowerAreaSignature area, const TimeValue start, const TimeValue stop) {
+	lockAIOut();
+
+	switch (area) {
+	case kLeftAreaSignature:
+		break;
+	case kMiddleAreaSignature:
+		if (_middleAreaOwner == kInventorySignature)
+			_middleInventoryTime = _middleAreaMovie.getTime();
+		else if (_middleAreaOwner == kBiochipSignature)
+			_middleBiochipTime = _middleAreaMovie.getTime();
+
+		_middleAreaMovie.stop();
+		_middleAreaMovie.setFlags(0);
+		_middleAreaMovie.setSegment(start, stop);
+		_middleAreaMovie.setTime(start);
+		_middleAreaMovie.show();
+		_middleAreaMovie.start();
+		g_vm->_cursor->hide();
+
+		while (_middleAreaMovie.isRunning()) {
+			InputDevice.pumpEvents();
+			g_vm->checkCallBacks();
+			g_vm->refreshDisplay();
+			g_system->delayMillis(10);
+		}
+
+		_middleAreaMovie.stop();
+		g_vm->_cursor->hideUntilMoved();
+
+		if (_middleAreaOwner == kInventorySignature)
+			setAIAreaToTime(_middleAreaOwner, kMiddleAreaSignature, _middleInventoryTime);
+		else if (_middleAreaOwner == kBiochipSignature)
+			setAIAreaToTime(_middleAreaOwner, kMiddleAreaSignature, _middleBiochipTime);
+		else
+			setAIAreaToTime(_middleAreaOwner, kMiddleAreaSignature, 0xffffffff);
+		break;
+	case kRightAreaSignature:
+		_rightBiochipTime = _rightAreaMovie.getTime();
+		_rightAreaMovie.setSegment(start, stop);
+		_rightAreaMovie.setTime(start);
+		_rightAreaMovie.show();
+		_rightAreaMovie.start();
+		g_vm->_cursor->hide();
+
+		while (_rightAreaMovie.isRunning()) {
+			InputDevice.pumpEvents();
+			g_vm->checkCallBacks();
+			g_vm->refreshDisplay();
+			g_system->delayMillis(10);
+		}
+
+		_rightAreaMovie.stop();
+		g_vm->_cursor->hideUntilMoved();
+		setAIAreaToTime(_rightAreaOwner, kRightAreaSignature, _rightBiochipTime);
+		break;
+	default:
+		break;
+	}
+
+	unlockAI();
+}
+
+bool AIArea::playAIMovie(const LowerAreaSignature area, const Common::Path &movieName, bool keepLastFrame, const InputBits interruptFilter) {
+	lockAIOut();
+
+	InputDevice.waitInput(interruptFilter);
+	if (_AIMovie.isMovieValid())
+		_AIMovie.releaseMovie();
+
+	_AIMovie.shareSurface(this);
+	_AIMovie.initFromMovieFile(movieName);
+
+	if (area == kLeftAreaSignature) {
+		_AIMovie.moveElementTo(kAILeftAreaLeft, kAILeftAreaTop);
+		_leftAreaMovie.hide();
+	} else {
+		_AIMovie.moveElementTo(kAIRightAreaLeft, kAIRightAreaTop);
+		_AIMovie.moveMovieBoxTo(kAIRightAreaLeft - kAILeftAreaLeft, 0);
+		_rightAreaMovie.hide();
+	}
+
+	_AIMovie.setTime(0);
+	_AIMovie.startDisplaying();
+	_AIMovie.show();
+	_AIMovie.redrawMovieWorld();
+	_AIMovie.setVolume(g_vm->getSoundFXLevel());
+	_AIMovie.start();
+	g_vm->_cursor->hide();
+
+	bool result = true;
+	bool saveAllowed = g_vm->swapSaveAllowed(false);
+	bool openAllowed = g_vm->swapLoadAllowed(false);
+
+	while (_AIMovie.isRunning()) {
+		Input input;
+		InputDevice.getInput(input, interruptFilter);
+
+		if (input.anyInput() || g_vm->shouldQuit() || g_vm->saveRequested() || g_vm->loadRequested()) {
+			result = false;
+			break;
+		}
+
+		g_vm->checkCallBacks();
+		g_vm->refreshDisplay();
+		g_system->delayMillis(10);
+	}
+
+	_AIMovie.stop();
+
+	g_vm->swapSaveAllowed(saveAllowed);
+	g_vm->swapLoadAllowed(openAllowed);
+
+	// This used to keep the last frame up even if the movie was interrupted.
+	// However, this only occurs in the recalibration, where interruption means skip the
+	// whole thing, so skipping causes the AI to go away even when keepLastFrame is true.
+
+	if (!(result && keepLastFrame)) {
+		_AIMovie.stopDisplaying();
+		_AIMovie.releaseMovie();
+
+		if (area == kLeftAreaSignature) {
+			_leftAreaMovie.setTime(_leftInventoryTime);
+			_leftAreaMovie.show();
+			_leftAreaMovie.redrawMovieWorld();
+		} else {
+			_rightAreaMovie.setTime(_rightBiochipTime);
+			_rightAreaMovie.show();
+			_rightAreaMovie.redrawMovieWorld();
+		}
+	}
+
+	g_vm->_cursor->hideUntilMoved();
+	unlockAI();
+	return result;
+}
+
+// Only implemented for kMiddleAreaSignature, kInventorySignature
+void AIArea::loopAIAreaSequence(const LowerClientSignature owner, const LowerAreaSignature area, const TimeValue start, const TimeValue stop) {
+	if (area == kMiddleAreaSignature && owner == kInventorySignature && owner == _middleAreaOwner) {
+		_middleAreaMovie.stop();
+		_middleAreaMovie.setFlags(0);
+		_middleAreaMovie.setSegment(start, stop);
+		_middleAreaMovie.setFlags(kLoopTimeBase);
+		_middleAreaMovie.setTime(start);
+		_middleAreaMovie.show();
+		_middleAreaMovie.start();
+	}
+}
+
+// Only called by kInventorySignature.
+void AIArea::setLeftMovieTime(const TimeValue time) {
+	if (!_AIMovie.isSurfaceValid()) {
+		_leftAreaMovie.setTime(time);
+		_leftAreaMovie.show();
+		_leftAreaMovie.redrawMovieWorld();
+	}
+
+	_leftAreaOwner = kInventorySignature;
+	_leftInventoryTime = time;
+}
+
+void AIArea::setMiddleMovieTime(const LowerClientSignature client, const TimeValue time) {
+	if (client == kInventorySignature) {
+		_middleInventoryTime = time;
+		if (_middleAreaOwner == kBiochipSignature) {
+			BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+			if (currentBiochip && currentBiochip->isSelected())
+				currentBiochip->giveUpSharedArea();
+		}
+	} else {
+		_middleBiochipTime = time;
+		if (_middleAreaOwner == kInventorySignature) {
+			InventoryItem *currentItem = g_vm->getCurrentInventoryItem();
+			if (currentItem && currentItem->isSelected())
+				currentItem->giveUpSharedArea();
+		}
+	}
+
+	_middleAreaMovie.setSegment(0, _middleAreaMovie.getDuration());
+	_middleAreaMovie.stop();
+	_middleAreaMovie.setFlags(0);
+	_middleAreaMovie.setTime(time);
+	_middleAreaMovie.show();
+	_middleAreaMovie.redrawMovieWorld();
+	_middleAreaOwner = client;
+}
+
+// Only called by kBiochipSignature.
+void AIArea::setRightMovieTime(const TimeValue time) {
+	if (!_AIMovie.isSurfaceValid()) {
+		// Can't do it when the AI movie is up...
+		_rightAreaMovie.setTime(time);
+		_rightAreaMovie.show();
+		_rightAreaMovie.redrawMovieWorld();
+	}
+
+	_rightAreaOwner = kBiochipSignature;
+	_rightBiochipTime = time;
+}
+
+void AIArea::handleInput(const Input &input, const Hotspot *cursorSpot) {
+	if (JMPPPInput::isToggleAIMiddleInput(input))
+		toggleMiddleAreaOwner();
+	else
+		InputHandler::handleInput(input, cursorSpot);
+}
+
+void AIArea::toggleMiddleAreaOwner() {
+	if (_middleAreaOwner == kInventorySignature) {
+		BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+		if (currentBiochip) {
+			setMiddleMovieTime(kBiochipSignature, currentBiochip->getSharedAreaTime());
+			currentBiochip->takeSharedArea();
+		}
+	} else if (_middleAreaOwner == kBiochipSignature) {
+		InventoryItem *currentItem = g_vm->getCurrentInventoryItem();
+		if (currentItem) {
+			setMiddleMovieTime(kInventorySignature, currentItem->getSharedAreaTime());
+			currentItem->takeSharedArea();
+		}
+	}
+}
+
+void AIArea::activateHotspots() {
+	if (_middleAreaOwner == kBiochipSignature) {
+		BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+		if (currentBiochip)
+			switch (currentBiochip->getObjectID()) {
+			case kAIBiochip:
+				((AIChip *)currentBiochip)->activateAIHotspots();
+				break;
+			case kPegasusBiochip:
+				if (!g_vm->isDemo())
+					((PegasusChip *)currentBiochip)->activatePegasusHotspots();
+				break;
+			case kOpticalBiochip:
+				((OpticalChip *)currentBiochip)->activateOpticalHotspots();
+				break;
+			case kArthurBiochip:
+				if (g_vm->isDVD())
+					((ArthurChip *)currentBiochip)->activateArthurHotspots();
+				break;
+			default:
+				break;
+			}
+	} else if (_middleAreaOwner == kInventorySignature) {
+		InventoryItem *currentItem = g_vm->getCurrentInventoryItem();
+		if (currentItem && currentItem->getObjectID() == kAirMask)
+			((AirMask *)currentItem)->activateAirMaskHotspots();
+	}
+
+	InputHandler::activateHotspots();
+}
+
+void AIArea::clickInHotspot(const Input &input, const Hotspot *hotspot) {
+	bool handled = false;
+
+	if (_middleAreaOwner == kBiochipSignature) {
+		BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+
+		if (currentBiochip) {
+			switch (currentBiochip->getObjectID()) {
+			case kAIBiochip:
+				if ((hotspot->getHotspotFlags() & kAIBiochipSpotFlag) != 0) {
+					((AIChip *)currentBiochip)->clickInAIHotspot(hotspot->getObjectID());
+					handled = true;
+				}
+				break;
+			case kPegasusBiochip:
+				if (!g_vm->isDemo() && ((hotspot->getHotspotFlags() & kPegasusBiochipSpotFlag) != 0)) {
+					((PegasusChip *)currentBiochip)->clickInPegasusHotspot();
+					handled = true;
+				}
+				break;
+			case kOpticalBiochip:
+				if ((hotspot->getHotspotFlags() & kOpticalBiochipSpotFlag) != 0) {
+					((OpticalChip *)currentBiochip)->clickInOpticalHotspot(hotspot->getObjectID());
+					handled = true;
+				}
+				break;
+			case kArthurBiochip:
+				if (g_vm->isDVD() && (hotspot->getHotspotFlags() & kArthurBiochipSpotFlag) != 0) {
+					((ArthurChip *)currentBiochip)->clickInArthurHotspot(hotspot->getObjectID());
+					handled = true;
+				}
+				break;
+			default:
+				break;
+			}
+		}
+	} else if (_middleAreaOwner == kInventorySignature) {
+		InventoryItem *currentItem = g_vm->getCurrentInventoryItem();
+
+		if (currentItem) {
+			switch (currentItem->getObjectID()) {
+			case kAirMask:
+				if ((hotspot->getHotspotFlags() & kAirMaskSpotFlag) != 0) {
+					((AirMask *)currentItem)->clickInAirMaskHotspot();
+					handled = true;
+				}
+				break;
+			default:
+				break;
+			}
+		}
+	}
+
+	if (!handled)
+		InputHandler::clickInHotspot(input, hotspot);
+}
+
+void AIArea::lockAIOut() {
+	if (_lockCount == 0)
+		stopIdling();
+
+	_lockCount++;
+}
+
+void AIArea::unlockAI() {
+	if (_lockCount > 0) {
+		_lockCount--;
+		if (_lockCount == 0)
+			startIdling();
+	}
+}
+
+void AIArea::forceAIUnlocked() {
+	if (_lockCount > 0) {
+		_lockCount = 1;
+		unlockAI();
+	}
+}
+
+void AIArea::checkRules() {
+	if (_lockCount == 0 && g_vm->playerAlive())
+		for (AIRuleList::iterator it = _AIRules.begin(); it != _AIRules.end(); it++)
+			if ((*it)->fireRule())
+				break;
+}
+
+void AIArea::useIdleTime() {
+	checkRules();
+}
+
+void AIArea::addAIRule(AIRule *rule) {
+	_AIRules.push_back(rule);
+}
+
+void AIArea::removeAllRules() {
+	for (AIRuleList::iterator it = _AIRules.begin(); it != _AIRules.end(); it++)
+		delete *it;
+
+	_AIRules.clear();
+}
+
+void AIArea::checkMiddleArea() {
+	BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+
+	if (currentBiochip) {
+		if (_middleAreaOwner == kBiochipSignature) {
+			switch (currentBiochip->getObjectID()) {
+			case kAIBiochip:
+				((AIChip *)currentBiochip)->setUpAIChip();
+				break;
+			case kPegasusBiochip:
+				((PegasusChip *)currentBiochip)->setUpPegasusChip();
+				break;
+			default:
+				break;
+			}
+		} else {
+			switch (currentBiochip->getObjectID()) {
+			case kAIBiochip:
+				((AIChip *)currentBiochip)->setUpAIChipRude();
+				break;
+			case kPegasusBiochip:
+				((PegasusChip *)currentBiochip)->setUpPegasusChipRude();
+				break;
+			default:
+				break;
+			}
+		}
+	}
+}
+
+TimeValue AIArea::getBigInfoTime() {
+	if (_middleAreaOwner == kInventorySignature) {
+		InventoryItem *currentItem = g_vm->getCurrentInventoryItem();
+		return currentItem->getInfoLeftTime();
+	} else if (_middleAreaOwner == kBiochipSignature) {
+		BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+		return currentBiochip->getInfoLeftTime();
+	}
+
+	return 0xffffffff;
+}
+
+void AIArea::getSmallInfoSegment(TimeValue &start, TimeValue &stop) {
+	if (_middleAreaOwner == kInventorySignature) {
+		InventoryItem *currentItem = g_vm->getCurrentInventoryItem();
+		currentItem->getInfoRightTimes(start, stop);
+	} else if (_middleAreaOwner == kBiochipSignature) {
+		BiochipItem *currentBiochip = g_vm->getCurrentBiochip();
+		currentBiochip->getInfoRightTimes(start, stop);
+	} else {
+		start = 0xffffffff;
+		stop = 0xffffffff;
+	}
+}
+
+LowerClientSignature AIArea::getMiddleAreaOwner() {
+	return _middleAreaOwner;
+}
+
+} // End of namespace Pegasus

engines/pegasus/ai/ai_area.h

@@ -0,0 +1,171 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef PEGASUS_AI_AIAREA_H
+#define PEGASUS_AI_AIAREA_H
+
+#include "pegasus/input.h"
+#include "pegasus/movie.h"
+#include "pegasus/timers.h"
+#include "pegasus/ai/ai_rule.h"
+
+namespace Common {
+	class ReadStream;
+	class WriteStream;
+}
+
+/*
+
+	The AI area is the area at the bottom of the screen. There are three areas within
+	the AI area:
+	1)	the inventory/AI help area
+	2)	the middle area
+	3)	the biochip display area
+
+	Area 1 is used for displaying the current inventory item. When the player changes the
+	current item, either by selecting a new one in the inventory list or by picking
+	up a new item, area 1 updates to show the new item.
+
+	If the AI decides to give a message, the AI's head temporarily takes over area 1
+	for the duration of the message, then goes away, returning the area to the current
+	inventory item.
+
+	Area 2 is used to display the current inventory item's state, the current biochip's
+	state, and any extra information from the AI. The contention for this area is
+	resolved as follows:
+	--	If the AI needs to use the area while giving a message in area 1, it takes over
+		area 2 for the duration of its message.
+*** This is not true.
+	--	If the player selects a new inventory item, the inventory item's state gets
+		displayed immediately.
+	--	If the player selects a new biochip, the biochip's state info gets displayed
+		immediately.
+	--	If any auto drawing is to occur, it seizes the area as soon as the drawing is
+		to occur. For example, the mapping biochip does auto drawing every time the
+		player takes a step. The only exception to this rule is if the AI is presenting
+		a warning. When the AI seizes areas 1 and 2, it preempts all other uses.
+	Some inventory items and biochips can cause arbitrary drawing to occur in this area
+	at arbitrary times. The map biochip is one example which causes drawing when the
+	player takes a step. Another example is the poison gas canister, which flashes in
+	this area to indicate a dangerous compound.
+
+	Area 3 is used to display the current biochip. When the player changes the current
+	biochip, either by selecting a new one from the biochip list or by picking up a
+	new one, area 3 updates to show the new item. In addition, some biochips can play
+	animation in this area.
+
+*/
+
+namespace Pegasus {
+
+class AIArea : public Surface, public Idler, public InputHandler {
+public:
+	AIArea(InputHandler *);
+	~AIArea() override;
+
+	void writeAIRules(Common::WriteStream *stream);
+	void readAIRules(Common::ReadStream *stream);
+
+	void initAIArea();
+
+	void saveAIState();
+	void restoreAIState();
+
+	void handleInput(const Input &, const Hotspot *) override;
+	void activateHotspots() override;
+	void clickInHotspot(const Input &, const Hotspot *) override;
+
+	void setAIVolume(const uint16);
+
+	// There are only so many legal combinations of client/area.
+	// Here is the list of supported pairs:
+	//      kInventorySignature     kLeftAreaSignature
+	//      kInventorySignature     kMiddleAreaSignature
+	//      kBiochipSignature       kMiddleAreaSignature
+	//      kBiochipSignature       kRightAreaSignature
+	//      kAISignature            kLeftAreaSignature
+	// Further, the kAISignature never sets a static frame time in the left area,
+	// but only plays a sequence from the AI movie.
+	void setAIAreaToTime(const LowerClientSignature, const LowerAreaSignature, const TimeValue);
+
+	// The "Play" functions play the requested sequence synchronously.
+	void playAIAreaSequence(const LowerClientSignature, const LowerAreaSignature, const TimeValue, const TimeValue);
+
+	// For PlayAIMovie, it is assumed that the client is the AI itself.
+	// This is used to play AI messages as well as Optical Memory video.
+	// Returns true if the movie played all the way through, false if it was interrupted.
+	bool playAIMovie(const LowerAreaSignature, const Common::Path &movieName, bool keepLastFrame, const InputBits);
+
+	// Loop the requested sequence indefinitely.
+	void loopAIAreaSequence(const LowerClientSignature, const LowerAreaSignature, const TimeValue, const TimeValue);
+
+	void addAIRule(AIRule *);
+
+	// Remove and delete all rules.
+	void removeAllRules();
+
+	void lockAIOut();
+	void unlockAI();
+	void forceAIUnlocked();
+
+	void checkMiddleArea();
+	void checkRules();
+
+	LowerClientSignature getMiddleAreaOwner();
+	void toggleMiddleAreaOwner();
+
+	TimeValue getBigInfoTime();
+	void getSmallInfoSegment(TimeValue &, TimeValue &);
+
+protected:
+	void useIdleTime() override;
+
+	void setLeftMovieTime(const TimeValue);
+	void setMiddleMovieTime(const LowerClientSignature, const TimeValue);
+	void setRightMovieTime(const TimeValue);
+
+	Movie _leftAreaMovie;
+	Movie _middleAreaMovie;
+	Movie _rightAreaMovie;
+	Movie _AIMovie;
+
+	LowerClientSignature _leftAreaOwner;
+	LowerClientSignature _middleAreaOwner;
+	LowerClientSignature _rightAreaOwner;
+
+	TimeValue _leftInventoryTime;
+	TimeValue _middleInventoryTime;
+	TimeValue _middleBiochipTime;
+	TimeValue _rightBiochipTime;
+
+	AIRuleList _AIRules;
+
+	uint _lockCount;
+};
+
+extern AIArea *g_AIArea;
+
+} // End of namespace Pegasus
+
+#endif

engines/pegasus/ai/ai_condition.cpp

@@ -0,0 +1,289 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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 "common/stream.h"
+
+#include "pegasus/energymonitor.h"
+#include "pegasus/gamestate.h"
+#include "pegasus/pegasus.h"
+#include "pegasus/ai/ai_condition.h"
+#include "pegasus/items/itemlist.h"
+#include "pegasus/items/biochips/biochipitem.h"
+#include "pegasus/items/inventory/inventoryitem.h"
+
+namespace Pegasus {
+
+AIOneChildCondition::AIOneChildCondition(AICondition *child) {
+	_child = child;
+}
+
+AIOneChildCondition::~AIOneChildCondition() {
+	delete _child;
+}
+
+void AIOneChildCondition::writeAICondition(Common::WriteStream *stream) {
+	if (_child)
+		_child->writeAICondition(stream);
+}
+
+void AIOneChildCondition::readAICondition(Common::ReadStream *stream) {
+	if (_child)
+		_child->readAICondition(stream);
+}
+
+AITwoChildrenCondition::AITwoChildrenCondition(AICondition *leftChild, AICondition *rightChild) {
+	_leftChild = leftChild;
+	_rightChild = rightChild;
+}
+
+AITwoChildrenCondition::~AITwoChildrenCondition() {
+	delete _leftChild;
+	delete _rightChild;
+}
+
+void AITwoChildrenCondition::writeAICondition(Common::WriteStream *stream) {
+	if (_leftChild)
+		_leftChild->writeAICondition(stream);
+
+	if (_rightChild)
+		_rightChild->writeAICondition(stream);
+}
+
+void AITwoChildrenCondition::readAICondition(Common::ReadStream *stream) {
+	if (_leftChild)
+		_leftChild->readAICondition(stream);
+
+	if (_rightChild)
+		_rightChild->readAICondition(stream);
+}
+
+AINotCondition::AINotCondition(AICondition* child) : AIOneChildCondition(child) {
+}
+
+bool AINotCondition::fireCondition() {
+	return _child && !_child->fireCondition();
+}
+
+AIAndCondition::AIAndCondition(AICondition *leftChild, AICondition *rightChild) : AITwoChildrenCondition(leftChild, rightChild) {
+}
+
+bool AIAndCondition::fireCondition() {
+	return _leftChild && _leftChild->fireCondition() && _rightChild && _rightChild->fireCondition();
+}
+
+AIOrCondition::AIOrCondition(AICondition *leftChild, AICondition *rightChild) : AITwoChildrenCondition(leftChild, rightChild) {
+}
+
+bool AIOrCondition::fireCondition() {
+	return (_leftChild && _leftChild->fireCondition()) || (_rightChild && _rightChild->fireCondition());
+}
+
+AITimerCondition::AITimerCondition(const TimeValue time, const TimeScale scale, const bool shouldStartTimer) {
+	_timerFuse.primeFuse(time, scale);
+	_timerFuse.setFunctor(new Common::Functor0Mem<void, AITimerCondition>(this, &AITimerCondition::fire));
+	_fired = false;
+
+	if (shouldStartTimer)
+		startTimer();
+}
+
+void AITimerCondition::startTimer() {
+	_fired = false;
+	_timerFuse.lightFuse();
+}
+
+void AITimerCondition::stopTimer() {
+	_timerFuse.stopFuse();
+}
+
+void AITimerCondition::writeAICondition(Common::WriteStream *stream) {
+	stream->writeByte(_timerFuse.isFuseLit());
+	stream->writeByte(_fired);
+	stream->writeUint32BE(_timerFuse.getTimeRemaining());
+	stream->writeUint32BE(_timerFuse.getFuseScale());
+}
+
+void AITimerCondition::readAICondition(Common::ReadStream *stream) {
+	bool running = stream->readByte();
+	_fired = stream->readByte();
+	TimeValue time = stream->readUint32BE();
+	TimeScale scale = stream->readUint32BE();
+
+	_timerFuse.stopFuse();
+	_timerFuse.primeFuse(time, scale);
+
+	if (running)
+		_timerFuse.lightFuse();
+}
+
+bool AITimerCondition::fireCondition() {
+	return _fired;
+}
+
+void AITimerCondition::fire() {
+	_fired = true;
+}
+
+AILocationCondition::AILocationCondition(uint32 maxLocations) {
+	_numLocations = 0;
+	_maxLocations = maxLocations;
+	_locations = new RoomViewID[maxLocations];
+}
+
+AILocationCondition::~AILocationCondition() {
+	delete[] _locations;
+}
+
+void AILocationCondition::addLocation(const RoomViewID location) {
+	if (_numLocations < _maxLocations)
+		_locations[_numLocations++] = location;
+}
+
+bool AILocationCondition::fireCondition() {
+	RoomViewID test = GameState.getCurrentRoomAndView(), *p;
+	uint32 i;
+
+	for (i = 0, p = _locations; i < _numLocations; i++, p++) {
+		if (test == *p) {
+			*p = MakeRoomView(kNoRoomID, kNoDirection);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+void AILocationCondition::writeAICondition(Common::WriteStream *stream) {
+	stream->writeUint32BE(_maxLocations);
+	stream->writeUint32BE(_numLocations);
+
+	uint32 i;
+	RoomViewID *p;
+	for (i = 0, p = _locations; i < _numLocations; i++, p++)
+		stream->writeUint32BE(*p);
+}
+
+void AILocationCondition::readAICondition(Common::ReadStream *stream) {
+	uint32 maxLocations = stream->readUint32BE();
+
+	if (_maxLocations != maxLocations) {
+		delete[] _locations;
+		_locations = new RoomViewID[maxLocations];
+		_maxLocations = maxLocations;
+	}
+
+	_numLocations = stream->readUint32BE();
+
+	uint32 i;
+	RoomViewID *p;
+	for (i = 0, p = _locations; i < _numLocations; i++, p++)
+		*p = stream->readUint32BE();
+}
+
+AIDoorOpenedCondition::AIDoorOpenedCondition(RoomViewID doorLocation) {
+	_doorLocation = doorLocation;
+}
+
+bool AIDoorOpenedCondition::fireCondition() {
+	return GameState.getCurrentRoomAndView() == _doorLocation && GameState.isCurrentDoorOpen();
+}
+
+AIHasItemCondition::AIHasItemCondition(const ItemID item) {
+	_item = item;
+}
+
+bool AIHasItemCondition::fireCondition() {
+	return _item == kNoItemID || GameState.isTakenItemID(_item);
+}
+
+AIDoesntHaveItemCondition::AIDoesntHaveItemCondition(const ItemID item) {
+	_item = item;
+}
+
+bool AIDoesntHaveItemCondition::fireCondition() {
+	return _item == kNoItemID || !GameState.isTakenItemID(_item);
+}
+
+AICurrentItemCondition::AICurrentItemCondition(const ItemID item) {
+	_item = item;
+}
+
+bool AICurrentItemCondition::fireCondition() {
+	InventoryItem *item = g_vm->getCurrentInventoryItem();
+
+	if (_item == kNoItemID)
+		return item == nullptr;
+
+	return item != nullptr && item->getObjectID() == _item;
+}
+
+AICurrentBiochipCondition::AICurrentBiochipCondition(const ItemID biochip)  {
+	_biochip = biochip;
+}
+
+bool AICurrentBiochipCondition::fireCondition() {
+	BiochipItem *biochip = g_vm->getCurrentBiochip();
+
+	if (_biochip == kNoItemID)
+		return biochip == nullptr;
+
+	return biochip != nullptr && biochip->getObjectID() == _biochip;
+}
+
+AIItemStateCondition::AIItemStateCondition(const ItemID item, const ItemState state) {
+	_item = item;
+	_state = state;
+}
+
+bool AIItemStateCondition::fireCondition() {
+	Item *item = g_allItems.findItemByID(_item);
+	return item != nullptr && item->getItemState() == _state;
+}
+
+AIEnergyMonitorCondition::AIEnergyMonitorCondition(const int32 energyThreshold) {
+	_energyThreshold = energyThreshold;
+}
+
+bool AIEnergyMonitorCondition::fireCondition() {
+	return g_energyMonitor != nullptr && g_energyMonitor->getCurrentEnergy() < _energyThreshold;
+}
+
+AILastExtraCondition::AILastExtraCondition(const ExtraID lastExtra) {
+	_lastExtra = lastExtra;
+}
+
+bool AILastExtraCondition::fireCondition() {
+	return g_neighborhood && (ExtraID)g_neighborhood->getLastExtra() == _lastExtra;
+}
+
+AICondition *makeLocationAndDoesntHaveItemCondition(const RoomID room, const DirectionConstant direction, const ItemID item) {
+	AILocationCondition *location = new AILocationCondition(1);
+	location->addLocation(MakeRoomView(room, direction));
+
+	AIDoesntHaveItemCondition *doesntHaveItem = new AIDoesntHaveItemCondition(item);
+
+	return new AIAndCondition(location, doesntHaveItem);
+}
+
+} // End of namespace Pegasus

engines/pegasus/ai/ai_condition.h

@@ -0,0 +1,286 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef PEGASUS_AI_AICONDITION_H
+#define PEGASUS_AI_AICONDITION_H
+
+#include "pegasus/timers.h"
+
+namespace Common {
+	class ReadStream;
+	class WriteStream;
+}
+
+namespace Pegasus {
+
+/////////////////////////////////////////////
+//
+// AICondition
+
+class AICondition {
+public:
+	AICondition() {}
+	virtual ~AICondition() {}
+
+	virtual bool fireCondition() = 0;
+
+	// Only need these for conditions that are dynamic, like timer conditions...
+	// other conditions, like item related conditions, which don't change during
+	// the run of an environment, are completely initted when the environment
+	// is created.
+	virtual void writeAICondition(Common::WriteStream *) {}
+	virtual void readAICondition(Common::ReadStream *) {}
+};
+
+/////////////////////////////////////////////
+//
+// AIOneChildCondition
+
+class AIOneChildCondition : public AICondition {
+public:
+	AIOneChildCondition(AICondition *);
+	~AIOneChildCondition() override;
+
+	void writeAICondition(Common::WriteStream *) override;
+	void readAICondition(Common::ReadStream *) override;
+
+protected:
+	AICondition *_child;
+};
+
+/////////////////////////////////////////////
+//
+// AITwoChildrenCondition
+
+class AITwoChildrenCondition : public AICondition {
+public:
+	AITwoChildrenCondition(AICondition *, AICondition *);
+	~AITwoChildrenCondition() override;
+
+	void writeAICondition(Common::WriteStream *) override;
+	void readAICondition(Common::ReadStream *) override;
+
+protected:
+	AICondition *_leftChild, *_rightChild;
+};
+
+/////////////////////////////////////////////
+//
+// AINotCondition
+
+class AINotCondition : public AIOneChildCondition {
+public:
+	AINotCondition(AICondition *);
+
+	bool fireCondition() override;
+};
+
+/////////////////////////////////////////////
+//
+// AIAndCondition
+
+class AIAndCondition : public AITwoChildrenCondition {
+public:
+	AIAndCondition(AICondition *, AICondition *);
+
+	bool fireCondition() override;
+};
+
+/////////////////////////////////////////////
+//
+// AIOrCondition
+
+class AIOrCondition : public AITwoChildrenCondition {
+public:
+	AIOrCondition(AICondition *, AICondition *);
+
+	bool fireCondition() override;
+};
+
+/////////////////////////////////////////////
+//
+// AITimerCondition
+
+class AITimerCondition : public AICondition {
+public:
+	AITimerCondition(const TimeValue, const TimeScale, const bool);
+
+	void startTimer();
+	void stopTimer();
+
+	bool fireCondition() override;
+
+	void writeAICondition(Common::WriteStream *) override;
+	void readAICondition(Common::ReadStream *) override;
+
+protected:
+	void fire();
+
+	FuseFunction _timerFuse;
+	bool _fired;
+};
+
+/////////////////////////////////////////////
+//
+// AILocationCondition
+
+class AILocationCondition : public AICondition {
+public:
+	AILocationCondition(uint32);
+	~AILocationCondition() override;
+
+	void addLocation(RoomViewID);
+	bool fireCondition() override;
+
+	void writeAICondition(Common::WriteStream *) override;
+	void readAICondition(Common::ReadStream *) override;
+
+protected:
+	uint32 _numLocations, _maxLocations;
+	RoomViewID *_locations;
+};
+
+/////////////////////////////////////////////
+//
+// AIDoorOpenedCondition
+
+class AIDoorOpenedCondition : public AICondition {
+public:
+	AIDoorOpenedCondition(RoomViewID);
+	~AIDoorOpenedCondition() override {}
+
+	bool fireCondition() override;
+
+protected:
+	RoomViewID _doorLocation;
+};
+
+/////////////////////////////////////////////
+//
+// AIHasItemCondition
+
+class AIHasItemCondition : public AICondition {
+public:
+	AIHasItemCondition(const ItemID);
+
+	bool fireCondition() override;
+
+protected:
+	ItemID _item;
+};
+
+/////////////////////////////////////////////
+//
+// AIDoesntHaveItemCondition
+
+class AIDoesntHaveItemCondition : public AICondition {
+public:
+	AIDoesntHaveItemCondition(const ItemID);
+
+	bool fireCondition() override;
+
+protected:
+	ItemID _item;
+};
+
+/////////////////////////////////////////////
+//
+// AICurrentItemCondition
+
+class AICurrentItemCondition : public AICondition {
+public:
+	AICurrentItemCondition(const ItemID);
+
+	bool fireCondition() override;
+
+protected:
+	ItemID _item;
+};
+
+/////////////////////////////////////////////
+//
+// AICurrentBiochipCondition
+
+class AICurrentBiochipCondition : public AICondition {
+public:
+	AICurrentBiochipCondition(const ItemID);
+
+	bool fireCondition() override;
+
+protected:
+	ItemID _biochip;
+};
+
+/////////////////////////////////////////////
+//
+// AIItemStateCondition
+
+class AIItemStateCondition : public AICondition {
+public:
+	AIItemStateCondition(const ItemID, const ItemState);
+
+	bool fireCondition() override;
+
+protected:
+	ItemID _item;
+	ItemState _state;
+};
+
+/////////////////////////////////////////////
+//
+// AIEnergyMonitorCondition
+
+class AIEnergyMonitorCondition : public AICondition {
+public:
+	AIEnergyMonitorCondition(const int32);
+
+	bool fireCondition() override;
+
+protected:
+	int32 _energyThreshold;
+};
+
+/////////////////////////////////////////////
+//
+// AILastExtraCondition
+
+class AILastExtraCondition : public AICondition {
+public:
+	AILastExtraCondition(const ExtraID);
+
+	bool fireCondition() override;
+
+protected:
+	ExtraID _lastExtra;
+};
+
+/////////////////////////////////////////////
+//
+// Helper functions
+
+AICondition *makeLocationAndDoesntHaveItemCondition(const RoomID room, const DirectionConstant direction, const ItemID item);
+
+} // End of namespace Pegasus
+
+#endif

engines/pegasus/ai/ai_rule.cpp

@@ -0,0 +1,77 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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 "common/stream.h"
+
+#include "pegasus/ai/ai_action.h"
+#include "pegasus/ai/ai_area.h"
+#include "pegasus/ai/ai_condition.h"
+#include "pegasus/ai/ai_rule.h"
+
+namespace Pegasus {
+
+bool AIRule::fireRule() {
+	if (_ruleActive && _ruleCondition && _ruleAction && _ruleCondition->fireCondition()) {
+		if (g_AIArea)
+			g_AIArea->lockAIOut();
+
+		_ruleAction->performAIAction(this);
+
+		if (--_ruleAction->_actionCount <= 0)
+			deactivateRule();
+
+		if (g_AIArea)
+			g_AIArea->unlockAI();
+
+		return true;
+	}
+
+	return false;
+}
+
+void AIRule::writeAIRule(Common::WriteStream *stream) {
+	stream->writeByte(_ruleActive);
+
+	if (_ruleCondition)
+		_ruleCondition->writeAICondition(stream);
+}
+
+void AIRule::readAIRule(Common::ReadStream *stream) {
+	_ruleActive = stream->readByte();
+
+	if (_ruleCondition)
+		_ruleCondition->readAICondition(stream);
+}
+
+void AIRuleList::writeAIRules(Common::WriteStream *stream) {
+	for (AIRuleList::iterator it = begin(); it != end(); it++)
+		(*it)->writeAIRule(stream);
+}
+
+void AIRuleList::readAIRules(Common::ReadStream *stream) {
+	for (AIRuleList::iterator it = begin(); it != end(); it++)
+		(*it)->readAIRule(stream);
+}
+
+} // End of namespace Pegasus

engines/pegasus/ai/ai_rule.h

@@ -0,0 +1,85 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef PEGASUS_AI_AIRULE_H
+#define PEGASUS_AI_AIRULE_H
+
+#include "common/list.h"
+
+#include "pegasus/ai/ai_action.h"
+#include "pegasus/ai/ai_condition.h"
+
+namespace Common {
+	class ReadStream;
+	class WriteStream;
+}
+
+namespace Pegasus {
+
+class AICondition;
+class AIAction;
+
+class AIRule {
+public:
+	AIRule(AICondition *condition, AIAction *rule) {
+		_ruleCondition = condition;
+		_ruleAction = rule;
+		_ruleActive = true;
+	}
+
+	~AIRule() {
+		if (_ruleCondition)
+			delete _ruleCondition;
+
+		if (_ruleAction)
+			delete _ruleAction;
+	}
+
+	bool fireRule();
+
+	void activateRule() { _ruleActive = true; }
+	void deactivateRule() { _ruleActive = false; }
+	bool isRuleActive() { return _ruleActive; }
+
+	void writeAIRule(Common::WriteStream *);
+	void readAIRule(Common::ReadStream *);
+
+protected:
+	AICondition *_ruleCondition;
+	AIAction *_ruleAction;
+	bool _ruleActive;
+};
+
+class AIRuleList : public Common::List<AIRule *> {
+public:
+	AIRuleList() {}
+	~AIRuleList() {}
+
+	void writeAIRules(Common::WriteStream *);
+	void readAIRules(Common::ReadStream *);
+};
+
+} // End of namespace Pegasus
+
+#endif