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path: root/engines/hugo/schedule_v1w.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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

/*
 * This code is based on original Hugo Trilogy source code
 *
 * Copyright (c) 1989-1995 David P. Gray
 *
 */

// This module contains all the scheduling and timing stuff

#include "common/system.h"

#include "hugo/game.h"
#include "hugo/hugo.h"
#include "hugo/schedule.h"
#include "hugo/global.h"
#include "hugo/file.h"
#include "hugo/display.h"
#include "hugo/parser.h"
#include "hugo/util.h"
#include "hugo/sound.h"
#include "hugo/object.h"

namespace Hugo {

Scheduler_v1w::Scheduler_v1w(HugoEngine *vm) : Scheduler_v3d(vm) {
}

Scheduler_v1w::~Scheduler_v1w() {
}

/**
* This function performs the action in the event structure pointed to by p
* It dequeues the event and returns it to the free list.  It returns a ptr
* to the next action in the list, except special case of NEW_SCREEN
*/
event_t *Scheduler_v1w::doAction(event_t *curEvent) {
	debugC(1, kDebugSchedule, "doAction - Event action type : %d", curEvent->action->a0.actType);

	status_t &gameStatus = _vm->getGameStatus();
	act *action = curEvent->action;
	char     *response;                             // User's response string
	object_t *obj1;
	object_t *obj2;
	int       dx, dy;
	event_t  *wrkEvent;                             // Save ev_p->next_p for return
	event_t  *saveEvent;                            // Used in DEL_EVENTS

	switch (action->a0.actType) {
	case ANULL:                                     // Big NOP from DEL_EVENTS
		break;
	case ASCHEDULE:                                 // act0: Schedule an action list
		insertActionList(action->a0.actIndex);
		break;
	case START_OBJ:                                 // act1: Start an object cycling
		_vm->_object->_objects[action->a1.objNumb].cycleNumb = action->a1.cycleNumb;
		_vm->_object->_objects[action->a1.objNumb].cycling = action->a1.cycle;
		break;
	case INIT_OBJXY:                                // act2: Initialise an object
		_vm->_object->_objects[action->a2.objNumb].x = action->a2.x;          // Coordinates
		_vm->_object->_objects[action->a2.objNumb].y = action->a2.y;
		break;
	case PROMPT: {                                  // act3: Prompt user for key phrase
		response = Utils::Box(BOX_PROMPT, "%s", _vm->_file->fetchString(action->a3.promptIndex));

		warning("STUB: doAction(act3), expecting answer %s", _vm->_file->fetchString(action->a3.responsePtr[0]));

		// TODO: The answer of the player is not handled currently! Once it'll be read in the messageBox, uncomment this block
#if 0
		bool      found;
		char     *tmpStr;                           // General purpose string ptr

		for (found = false, dx = 0; !found && (action->a3.responsePtr[dx] != -1); dx++) {
			tmpStr = _vm->_file->fetchString(action->a3.responsePtr[dx]);
			if (strstr(Utils::strlwr(response) , tmpStr))
				found = true;
		}

		if (found)
			insertActionList(action->a3.actPassIndex);
		else
			insertActionList(action->a3.actFailIndex);
#endif

		// HACK: As the answer is not read, currently it's always considered correct
		insertActionList(action->a3.actPassIndex);
		break;
		}
	case BKGD_COLOR:                                // act4: Set new background color
		_vm->_screen->setBackgroundColor(action->a4.newBackgroundColor);
		break;
	case INIT_OBJVXY:                               // act5: Initialise an object velocity
		_vm->_object->setVelocity(action->a5.objNumb, action->a5.vx, action->a5.vy);
		break;
	case INIT_CARRY:                                // act6: Initialise an object
		_vm->_object->setCarry(action->a6.objNumb, action->a6.carriedFl);  // carried status
		break;
	case INIT_HF_COORD:                             // act7: Initialise an object to hero's "feet" coords
		_vm->_object->_objects[action->a7.objNumb].x = _vm->_hero->x - 1;
		_vm->_object->_objects[action->a7.objNumb].y = _vm->_hero->y + _vm->_hero->currImagePtr->y2 - 1;
		_vm->_object->_objects[action->a7.objNumb].screenIndex = *_vm->_screen_p;  // Don't forget screen!
		break;
	case NEW_SCREEN:                                // act8: Start new screen
		newScreen(action->a8.screenIndex);
		break;
	case INIT_OBJSTATE:                             // act9: Initialise an object state
		_vm->_object->_objects[action->a9.objNumb].state = action->a9.newState;
		break;
	case INIT_PATH:                                 // act10: Initialise an object path and velocity
		_vm->_object->setPath(action->a10.objNumb, (path_t) action->a10.newPathType, action->a10.vxPath, action->a10.vyPath);
		break;
	case COND_R:                                    // act11: action lists conditional on object state
		if (_vm->_object->_objects[action->a11.objNumb].state == action->a11.stateReq)
			insertActionList(action->a11.actPassIndex);
		else
			insertActionList(action->a11.actFailIndex);
		break;
	case TEXT:                                      // act12: Text box (CF WARN)
		Utils::Box(BOX_ANY, "%s", _vm->_file->fetchString(action->a12.stringIndex));   // Fetch string from file
		break;
	case SWAP_IMAGES:                               // act13: Swap 2 object images
		_vm->_object->swapImages(action->a13.obj1, action->a13.obj2);
		break;
	case COND_SCR:                                  // act14: Conditional on current screen
		if (_vm->_object->_objects[action->a14.objNumb].screenIndex == action->a14.screenReq)
			insertActionList(action->a14.actPassIndex);
		else
			insertActionList(action->a14.actFailIndex);
		break;
	case AUTOPILOT:                                 // act15: Home in on a (stationary) object
		// object p1 will home in on object p2
		obj1 = &_vm->_object->_objects[action->a15.obj1];
		obj2 = &_vm->_object->_objects[action->a15.obj2];
		obj1->pathType = AUTO;
		dx = obj1->x + obj1->currImagePtr->x1 - obj2->x - obj2->currImagePtr->x1;
		dy = obj1->y + obj1->currImagePtr->y1 - obj2->y - obj2->currImagePtr->y1;

		if (dx == 0)                                // Don't EVER divide by zero!
			dx = 1;
		if (dy == 0)
			dy = 1;

		if (abs(dx) > abs(dy)) {
			obj1->vx = action->a15.dx * -SIGN(dx);
			obj1->vy = abs((action->a15.dy * dy) / dx) * -SIGN(dy);
		} else {
			obj1->vy = action->a15.dy * -SIGN(dy);
			obj1->vx = abs((action->a15.dx * dx) / dy) * -SIGN(dx);
		}
		break;
	case INIT_OBJ_SEQ:                              // act16: Set sequence number to use
		// Note: Don't set a sequence at time 0 of a new screen, it causes
		// problems clearing the boundary bits of the object!  t>0 is safe
		_vm->_object->_objects[action->a16.objNumb].currImagePtr = _vm->_object->_objects[action->a16.objNumb].seqList[action->a16.seqIndex].seqPtr;
		break;
	case SET_STATE_BITS:                            // act17: OR mask with curr obj state
		_vm->_object->_objects[action->a17.objNumb].state |= action->a17.stateMask;
		break;
	case CLEAR_STATE_BITS:                          // act18: AND ~mask with curr obj state
		_vm->_object->_objects[action->a18.objNumb].state &= ~action->a18.stateMask;
		break;
	case TEST_STATE_BITS:                           // act19: If all bits set, do apass else afail
		if ((_vm->_object->_objects[action->a19.objNumb].state & action->a19.stateMask) == action->a19.stateMask)
			insertActionList(action->a19.actPassIndex);
		else
			insertActionList(action->a19.actFailIndex);
		break;
	case DEL_EVENTS:                                // act20: Remove all events of this action type
		// Note: actions are not deleted here, simply turned into NOPs!
		wrkEvent = _headEvent;                      // The earliest event
		while (wrkEvent) {                          // While events found in list
			saveEvent = wrkEvent->nextEvent;
			if (wrkEvent->action->a20.actType == action->a20.actTypeDel)
				delQueue(wrkEvent);
			wrkEvent = saveEvent;
		}
		break;
	case GAMEOVER:                                  // act21: Game over!
		// NOTE: Must wait at least 1 tick before issuing this action if
		// any objects are to be made invisible!
		gameStatus.gameOverFl = true;
		break;
	case INIT_HH_COORD:                             // act22: Initialise an object to hero's actual coords
		_vm->_object->_objects[action->a22.objNumb].x = _vm->_hero->x;
		_vm->_object->_objects[action->a22.objNumb].y = _vm->_hero->y;
		_vm->_object->_objects[action->a22.objNumb].screenIndex = *_vm->_screen_p;// Don't forget screen!
		break;
	case EXIT:                                      // act23: Exit game back to DOS
		_vm->endGame();
		break;
	case BONUS:                                     // act24: Get bonus score for action
		processBonus(action->a24.pointIndex);
		break;
	case COND_BOX:                                  // act25: Conditional on bounding box
		obj1 = &_vm->_object->_objects[action->a25.objNumb];
		dx = obj1->x + obj1->currImagePtr->x1;
		dy = obj1->y + obj1->currImagePtr->y2;
		if ((dx >= action->a25.x1) && (dx <= action->a25.x2) &&
		        (dy >= action->a25.y1) && (dy <= action->a25.y2))
			insertActionList(action->a25.actPassIndex);
		else
			insertActionList(action->a25.actFailIndex);
		break;
	case SOUND:                                     // act26: Play a sound (or tune)
		if (action->a26.soundIndex < _vm->_tunesNbr)
			_vm->_sound->playMusic(action->a26.soundIndex);
		else
			_vm->_sound->playSound(action->a26.soundIndex, BOTH_CHANNELS, MED_PRI);
		break;
	case ADD_SCORE:                                 // act27: Add object's value to score
		_vm->adjustScore(_vm->_object->_objects[action->a27.objNumb].objValue);
		break;
	case SUB_SCORE:                                 // act28: Subtract object's value from score
		_vm->adjustScore(-_vm->_object->_objects[action->a28.objNumb].objValue);
		break;
	case COND_CARRY:                                // act29: Conditional on object being carried
		if (_vm->_object->isCarried(action->a29.objNumb))
			insertActionList(action->a29.actPassIndex);
		else
			insertActionList(action->a29.actFailIndex);
		break;
	case INIT_MAZE:                                 // act30: Enable and init maze structure
		_maze.enabledFl = true;
		_maze.size = action->a30.mazeSize;
		_maze.x1 = action->a30.x1;
		_maze.y1 = action->a30.y1;
		_maze.x2 = action->a30.x2;
		_maze.y2 = action->a30.y2;
		_maze.x3 = action->a30.x3;
		_maze.x4 = action->a30.x4;
		_maze.firstScreenIndex = action->a30.firstScreenIndex;
		break;
	case EXIT_MAZE:                                 // act31: Disable maze mode
		_maze.enabledFl = false;
		break;
	case INIT_PRIORITY:
		_vm->_object->_objects[action->a32.objNumb].priority = action->a32.priority;
		break;
	case INIT_SCREEN:
		_vm->_object->_objects[action->a33.objNumb].screenIndex = action->a33.screenIndex;
		break;
	case AGSCHEDULE:                                // act34: Schedule a (global) action list
		insertActionList(action->a34.actIndex);
		break;
	case REMAPPAL:                                  // act35: Remap a palette color
		_vm->_screen->remapPal(action->a35.oldColorIndex, action->a35.newColorIndex);
		break;
	case COND_NOUN:                                 // act36: Conditional on noun mentioned
		if (_vm->_parser->isWordPresent(_vm->_arrayNouns[action->a36.nounIndex]))
			insertActionList(action->a36.actPassIndex);
		else
			insertActionList(action->a36.actFailIndex);
		break;
	case SCREEN_STATE:                              // act37: Set new screen state
		_vm->_screenStates[action->a37.screenIndex] = action->a37.newState;
		break;
	case INIT_LIPS:                                 // act38: Position lips on object
		_vm->_object->_objects[action->a38.lipsObjNumb].x = _vm->_object->_objects[action->a38.objNumb].x + action->a38.dxLips;
		_vm->_object->_objects[action->a38.lipsObjNumb].y = _vm->_object->_objects[action->a38.objNumb].y + action->a38.dyLips;
		_vm->_object->_objects[action->a38.lipsObjNumb].screenIndex = *_vm->_screen_p; // Don't forget screen!
		_vm->_object->_objects[action->a38.lipsObjNumb].cycling = CYCLE_FORWARD;
		break;
	case INIT_STORY_MODE:                           // act39: Init story_mode flag
		// This is similar to the QUIET path mode, except that it is
		// independant of it and it additionally disables the ">" prompt
		gameStatus.storyModeFl = action->a39.storyModeFl;

		// End the game after story if this is special vendor demo mode
		if (gameStatus.demoFl && action->a39.storyModeFl == false)
			_vm->endGame();
		break;
	case WARN:                                      // act40: Text box (CF TEXT)
		Utils::Box(BOX_OK, "%s", _vm->_file->fetchString(action->a40.stringIndex));
		break;
	case COND_BONUS:                                // act41: Perform action if got bonus
		if (_vm->_points[action->a41.BonusIndex].scoredFl)
			insertActionList(action->a41.actPassIndex);
		else
			insertActionList(action->a41.actFailIndex);
		break;
	case TEXT_TAKE:                                 // act42: Text box with "take" message
		Utils::Box(BOX_ANY, TAKE_TEXT, _vm->_arrayNouns[_vm->_object->_objects[action->a42.objNumb].nounIndex][TAKE_NAME]);
		break;
	case YESNO:                                     // act43: Prompt user for Yes or No
		warning("doAction(act43) - Yes/No Box");
		if (Utils::Box(BOX_YESNO, "%s", _vm->_file->fetchString(action->a43.promptIndex)) != 0)
			insertActionList(action->a43.actYesIndex);
		else
			insertActionList(action->a43.actNoIndex);
		break;
	case STOP_ROUTE:                                // act44: Stop any route in progress
		gameStatus.routeIndex = -1;
		break;
	case COND_ROUTE:                                // act45: Conditional on route in progress
		if (gameStatus.routeIndex >= action->a45.routeIndex)
			insertActionList(action->a45.actPassIndex);
		else
			insertActionList(action->a45.actFailIndex);
		break;
	case INIT_JUMPEXIT:                             // act46: Init status.jumpexit flag
		// This is to allow left click on exit to get there immediately
		// For example the plane crash in Hugo2 where hero is invisible
		// Couldn't use INVISIBLE flag since conflicts with boat in Hugo1
		gameStatus.jumpExitFl = action->a46.jumpExitFl;
		break;
	case INIT_VIEW:                                 // act47: Init object.viewx, viewy, dir
		_vm->_object->_objects[action->a47.objNumb].viewx = action->a47.viewx;
		_vm->_object->_objects[action->a47.objNumb].viewy = action->a47.viewy;
		_vm->_object->_objects[action->a47.objNumb].direction = action->a47.direction;
		break;
	case INIT_OBJ_FRAME:                            // act48: Set seq,frame number to use
		// Note: Don't set a sequence at time 0 of a new screen, it causes
		// problems clearing the boundary bits of the object!  t>0 is safe
		_vm->_object->_objects[action->a48.objNumb].currImagePtr = _vm->_object->_objects[action->a48.objNumb].seqList[action->a48.seqIndex].seqPtr;
		for (dx = 0; dx < action->a48.frameIndex; dx++)
			_vm->_object->_objects[action->a48.objNumb].currImagePtr = _vm->_object->_objects[action->a48.objNumb].currImagePtr->nextSeqPtr;
		break;
	default:
		Utils::Error(EVNT_ERR, "%s", "doAction");
		break;
	}

	if (action->a0.actType == NEW_SCREEN) {         // New_screen() deletes entire list
		return 0;                                   // next_p = 0 since list now empty
	} else {
		wrkEvent = curEvent->nextEvent;
		delQueue(curEvent);                         // Return event to free list
		return wrkEvent;                            // Return next event ptr
	}
}

/**
* Write the event queue to the file with handle f
* Note that we convert all the event structure ptrs to indexes
* using -1 for NULL.  We can't convert the action ptrs to indexes
* so we save address of first dummy action ptr to compare on restore.
*/
void Scheduler_v1w::saveEvents(Common::WriteStream *f) {
	debugC(1, kDebugSchedule, "saveEvents()");

	uint32 curTime = getWinTicks();
	event_t  saveEventArr[kMaxEvents];              // Convert event ptrs to indexes

	// Convert event ptrs to indexes
	for (int16 i = 0; i < kMaxEvents; i++) {
		event_t *wrkEvent = &_events[i];
		saveEventArr[i] = *wrkEvent;
		saveEventArr[i].prevEvent = (wrkEvent->prevEvent == 0) ? (event_t *) - 1 : (event_t *)(wrkEvent->prevEvent - _events);
		saveEventArr[i].nextEvent = (wrkEvent->nextEvent == 0) ? (event_t *) - 1 : (event_t *)(wrkEvent->nextEvent - _events);
	}

	int16 freeIndex = (_freeEvent == 0) ? -1 : _freeEvent - _events;
	int16 headIndex = (_headEvent == 0) ? -1 : _headEvent - _events;
	int16 tailIndex = (_tailEvent == 0) ? -1 : _tailEvent - _events;

	f->write(&curTime,   sizeof(curTime));
	f->write(&freeIndex, sizeof(freeIndex));
	f->write(&headIndex, sizeof(headIndex));
	f->write(&tailIndex, sizeof(tailIndex));
	f->write(saveEventArr, sizeof(saveEventArr));
}

/**
* Restore the event list from file with handle f
*/
void Scheduler_v1w::restoreEvents(Common::SeekableReadStream *f) {
	debugC(1, kDebugSchedule, "restoreEvents");

	uint32   saveTime;
	int16    freeIndex;                             // Free list index
	int16    headIndex;                             // Head of list index
	int16    tailIndex;                             // Tail of list index
	event_t  savedEvents[kMaxEvents];               // Convert event ptrs to indexes

	f->read(&saveTime,  sizeof(saveTime));          // time of save
	f->read(&freeIndex, sizeof(freeIndex));
	f->read(&headIndex, sizeof(headIndex));
	f->read(&tailIndex, sizeof(tailIndex));
	f->read(savedEvents, sizeof(savedEvents));

	event_t *wrkEvent;
	// Restore events indexes to pointers
	for (int i = 0; i < kMaxEvents; i++) {
		wrkEvent = &savedEvents[i];
		_events[i] = *wrkEvent;
		_events[i].prevEvent = (wrkEvent->prevEvent == (event_t *) - 1) ? (event_t *)0 : &_events[(size_t)wrkEvent->prevEvent ];
		_events[i].nextEvent = (wrkEvent->nextEvent == (event_t *) - 1) ? (event_t *)0 : &_events[(size_t)wrkEvent->nextEvent ];
	}
	_freeEvent = (freeIndex == -1) ? 0 : &_events[freeIndex];
	_headEvent = (headIndex == -1) ? 0 : &_events[headIndex];
	_tailEvent = (tailIndex == -1) ? 0 : &_events[tailIndex];

	// Adjust times to fit our time
	uint32 curTime = getWinTicks();
	wrkEvent = _headEvent;                              // The earliest event
	while (wrkEvent) {                              // While mature events found
		wrkEvent->time = wrkEvent->time - saveTime + curTime;
		wrkEvent = wrkEvent->nextEvent;
	}
}

/**
* Insert the action pointed to by p into the timer event queue
* The queue goes from head (earliest) to tail (latest) timewise
*/
void Scheduler_v1w::insertAction(act *action) {
	debugC(1, kDebugSchedule, "insertAction() - Action type A%d", action->a0.actType);

	// First, get and initialise the event structure
	event_t *curEvent = getQueue();
	curEvent->action = action;
	switch (action->a0.actType) {                   // Assign whether local or global
	case AGSCHEDULE:
		curEvent->localActionFl = false;            // Lasts over a new screen
		break;
	default:
		curEvent->localActionFl = true;             // Rest are for current screen only
		break;
	}

	curEvent->time = action->a0.timer + getWinTicks(); // Convert rel to abs time

	// Now find the place to insert the event
	if (!_tailEvent) {                              // Empty queue
		_tailEvent = _headEvent = curEvent;
		curEvent->nextEvent = curEvent->prevEvent = 0;
	} else {
		event_t *wrkEvent = _tailEvent;             // Search from latest time back
		bool found = false;

		while (wrkEvent && !found) {
			if (wrkEvent->time <= curEvent->time) { // Found if new event later
				found = true;
				if (wrkEvent == _tailEvent)         // New latest in list
					_tailEvent = curEvent;
				else
					wrkEvent->nextEvent->prevEvent = curEvent;
				curEvent->nextEvent = wrkEvent->nextEvent;
				wrkEvent->nextEvent = curEvent;
				curEvent->prevEvent = wrkEvent;
			}
			wrkEvent = wrkEvent->prevEvent;
		}

		if (!found) {                               // Must be earliest in list
			_headEvent->prevEvent = curEvent;       // So insert as new head
			curEvent->nextEvent = _headEvent;
			curEvent->prevEvent = 0;
			_headEvent = curEvent;
		}
	}
}

/**
* This is the scheduler which runs every tick.  It examines the event queue
* for any events whose time has come.  It dequeues these events and performs
* the action associated with the event, returning it to the free queue
*/
void Scheduler_v1w::runScheduler() {
	debugC(6, kDebugSchedule, "runScheduler");

	status_t &gameStatus = _vm->getGameStatus();
	event_t *curEvent = _headEvent;                 // The earliest event

	while (curEvent && curEvent->time <= gameStatus.tick) // While mature events found
		curEvent = doAction(curEvent);              // Perform the action (returns next_p)
	gameStatus.tick++;                              // Accessed elsewhere via getTicks()
}
} // End of namespace Hugo