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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) 1994-1998 Revolution Software Ltd.
 * 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
 * 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/engines/sword2/router.h $
 * $Id: router.h 30944 2008-02-23 22:50:18Z sev $


// This used to be a variable, but it was never set. Actually, it wasn't even
// initialised!
// Define this to force the use of slidy router (so solid path not used when
// ending walk in ANY direction)
// #define FORCE_SLIDY

#include "sword2/object.h"

namespace Sword2 {

struct WalkData {
      uint16 frame;
      int16 x;
      int16 y;
      uint8 step;
      uint8 dir;

struct BarData {
      int16 x1;
      int16 y1;
      int16 x2;
      int16 y2;
      int16 xmin;
      int16 ymin;
      int16 xmax;
      int16 ymax;
      int16 dx;   // x2 - x1
      int16 dy;   // y2 - y1
      int32 co;   // co = (y1*dx) - (x1*dy) from an equation for a line y*dx = x*dy + co

struct NodeData {
      int16 x;
      int16 y;
      int16 level;
      int16 prev;
      int16 dist;

// because we only have 2 megas in the game!
#define TOTAL_ROUTE_SLOTS     2

#define NO_DIRECTIONS         8
#define ROUTE_END_FLAG        255

#define MAX_WALKGRIDS         10

#define     O_WALKANIM_SIZE         600   // max number of nodes in router output
#define     O_GRID_SIZE       200   // max 200 lines & 200 points
#define     O_ROUTE_SIZE            50    // max number of modules in a route

struct RouteData {
      int32 x;
      int32 y;
      int32 dirS;
      int32 dirD;

struct PathData {
      int32 x;
      int32 y;
      int32 dir;
      int32 num;

class Router {
      Sword2Engine *_vm;

      int16 _standbyX;  // see fnSetStandbyCoords()
      int16 _standbyY;
      int16 _standbyDir;

      // stores pointers to mem blocks containing routes created & used by
      // megas (NULL if slot not in use)
      WalkData *_routeSlots[TOTAL_ROUTE_SLOTS];

      BarData _bars[O_GRID_SIZE];
      NodeData _node[O_GRID_SIZE];

      int32 _walkGridList[MAX_WALKGRIDS];

      int32 _nBars;
      int32 _nNodes;

      int32 _startX, _startY, _startDir;
      int32 _targetX, _targetY, _targetDir;
      int32 _scaleA, _scaleB;

      RouteData _route[O_ROUTE_SIZE];
      PathData _smoothPath[O_ROUTE_SIZE];
      PathData _modularPath[O_ROUTE_SIZE];
      int32 _routeLength;

      int32 _framesPerStep;
      int32 _framesPerChar;

      ObjectWalkdata _walkData;

      int8 _modX[NO_DIRECTIONS];
      int8 _modY[NO_DIRECTIONS];
      int32 _diagonalx;
      int32 _diagonaly;

      int32 _firstStandFrame;

      int32 _firstStandingTurnLeftFrame;
      int32 _firstStandingTurnRightFrame;

      int32 _firstWalkingTurnLeftFrame;   // left walking turn
      int32 _firstWalkingTurnRightFrame;  // right walking turn

      uint32 _firstSlowInFrame[NO_DIRECTIONS];

      int32 _firstSlowOutFrame;

      // number of slow-out frames on for each leading-leg in each direction
      // ie. total number of slow-out frames = (numberOfSlowOutFrames * 2 *

      int32 _numberOfSlowOutFrames;

      int32 _stepCount;

      int32 _moduleX;
      int32 _moduleY;
      int32 _currentDir;
      int32 _lastCount;
      int32 _frame;

      uint8 returnSlotNo(uint32 megaId);

      int32 getRoute();
      void extractRoute();
      void loadWalkGrid();
      void setUpWalkGrid(byte *ob_mega, int32 x, int32 y, int32 dir);
      void loadWalkData(byte *ob_walkdata);
      bool scan(int32 level);

      int32 newCheck(int32 status, int32 x1, int32 y1, int32 x2, int32 y2);
      bool lineCheck(int32 x1, int32 x2, int32 y1, int32 y2);
      bool vertCheck(int32 x, int32 y1, int32 y2);
      bool horizCheck(int32 x1, int32 y, int32 x2);
      bool check(int32 x1, int32 y1, int32 x2, int32 y2);
      int32 checkTarget(int32 x, int32 y);

      int32 smoothestPath();
      void slidyPath();

      int32 smoothCheck(int32 best, int32 p, int32 dirS, int32 dirD);

      bool addSlowInFrames(WalkData *walkAnim);
      void addSlowOutFrames(WalkData *walkAnim);
      void slidyWalkAnimator(WalkData *walkAnim);

      void solidPath();
      int32 solidWalkAnimator(WalkData *walkAnim);

      void plotCross(int16 x, int16 y, uint8 colour);

      Router(Sword2Engine *vm) : _vm(vm), _diagonalx(0), _diagonaly(0) {
            memset(_routeSlots, 0, sizeof(_routeSlots));
            memset(_bars, 0, sizeof(_bars));
            memset(_node, 0, sizeof(_node));
            memset(_walkGridList, 0, sizeof(_walkGridList));
            memset(_route, 0, sizeof(_route));
            memset(_smoothPath, 0, sizeof(_smoothPath));
            memset(_modularPath, 0, sizeof(_modularPath));
            memset(_modX, 0, sizeof(_modX));
            memset(_modY, 0, sizeof(_modY));
            memset(_firstSlowInFrame, 0, sizeof(_firstSlowInFrame));

      void setStandbyCoords(int16 x, int16 y, uint8 dir);
      int whatTarget(int startX, int startY, int destX, int destY);

      // Sprites
      void setSpriteStatus(byte *ob_graph, uint32 type);
      void setSpriteShading(byte *ob_graph, uint32 type);

      // Animation
      int doAnimate(byte *ob_logic, byte *ob_graph, int32 animRes, bool reverse);
      int megaTableAnimate(byte *ob_logic, byte *ob_graph, byte *ob_mega, byte *animTable, bool reverse);

      // Walking
      int doWalk(byte *ob_logic, byte *ob_graph, byte *ob_mega, byte *ob_walkdata, int16 target_x, int16 target_y, uint8 target_dir);
      int walkToAnim(byte *ob_logic, byte *ob_graph, byte *ob_mega, byte *ob_walkdata, uint32 animRes);
      int walkToTalkToMega(byte *ob_logic, byte *ob_graph, byte *ob_mega, byte *ob_walkdata, uint32 megaId, uint32 separation);

      // Turning
      int doFace(byte *ob_logic, byte *ob_graph, byte *ob_mega, byte *ob_walkdata, uint8 target_dir);
      int faceXY(byte *ob_logic, byte *ob_graph, byte *ob_mega, byte *ob_walkdata, int16 target_x, int16 target_y);
      int faceMega(byte *ob_logic, byte *ob_graph, byte *ob_mega, byte *ob_walkdata, uint32 megaId);

      // Standing
      void standAt(byte *ob_graph, byte *ob_mega, int32 x, int32 y, int32 dir);
      void standAfterAnim(byte *ob_graph, byte *ob_mega, uint32 animRes);
      void standAtAnim(byte *ob_graph, byte *ob_mega, uint32 animRes);

      int32 routeFinder(byte *ob_mega, byte *ob_walkdata, int32 x, int32 y, int32 dir);

      void earlySlowOut(byte *ob_mega, byte *ob_walkdata);

      void allocateRouteMem();
      WalkData *getRouteMem();
      void freeRouteMem();
      void freeAllRouteMem();
      void addWalkGrid(int32 gridResource);
      void removeWalkGrid(int32 gridResource);
      void clearWalkGridList();

      void plotWalkGrid();

} // End of namespace Sword2


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