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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "autoroute.h"
#define ROUTE_GRID_WIDTH ((GAME_SCREEN_WIDTH/8)+2)
#define ROUTE_GRID_HEIGHT ((GAME_SCREEN_HEIGHT/8)+2)
#define ROUTE_GRID_SIZE (ROUTE_GRID_WIDTH*ROUTE_GRID_HEIGHT*2)
#define WALK_JUMP 8 // walk in blocks of 8
const int16 SkyAutoRoute::_routeDirections[4] = { -1, 1, -ROUTE_GRID_WIDTH, ROUTE_GRID_WIDTH };
const uint16 SkyAutoRoute::_logicCommands[4] = { RIGHTY, LEFTY, DOWNY, UPY };
SkyAutoRoute::SkyAutoRoute(SkyGrid *pGrid) {
_grid = pGrid;
_routeGrid = (uint16 *)malloc(ROUTE_GRID_SIZE);
_routeBuf = (uint16 *)malloc(ROUTE_SPACE);
}
SkyAutoRoute::~SkyAutoRoute(void) {
free(_routeGrid);
free(_routeBuf);
}
uint16 SkyAutoRoute::checkBlock(uint16 *blockPos) {
uint16 retVal = 0xFFFF;
for (uint8 cnt = 0; cnt < 4; cnt++) {
uint16 fieldVal = *(blockPos + _routeDirections[cnt]);
if (fieldVal && (fieldVal < retVal))
retVal = fieldVal;
}
return retVal;
}
void SkyAutoRoute::clipCoordX(uint16 x, uint8 &blkX, int16 &initX) {
if (x < TOP_LEFT_X) {
blkX = 0;
initX = x - TOP_LEFT_X;
} else if (x >= TOP_LEFT_X + GAME_SCREEN_WIDTH) {
blkX = (GAME_SCREEN_WIDTH - 1) >> 3;
initX = x - (TOP_LEFT_X + GAME_SCREEN_WIDTH);
} else {
blkX = (x - TOP_LEFT_X) >> 3;
initX = 0;
}
}
void SkyAutoRoute::clipCoordY(uint16 y, uint8 &blkY, int16 &initY) {
if (y < TOP_LEFT_Y) {
blkY = 0;
initY = y - TOP_LEFT_Y;
} else if (y >= TOP_LEFT_Y + GAME_SCREEN_HEIGHT) {
blkY = (GAME_SCREEN_HEIGHT - 1) >> 3;
initY = y - (TOP_LEFT_Y + GAME_SCREEN_WIDTH);
} else {
blkY = (y - TOP_LEFT_Y) >> 3;
initY = 0;
}
}
void SkyAutoRoute::initWalkGrid(uint8 screen, uint8 width) {
uint16 *wGridPos;
uint8 stretch = 0;
uint8 *screenGrid = _grid->giveGrid(screen);
screenGrid += GRID_SIZE;
wGridPos = _routeGrid + (ROUTE_GRID_SIZE >> 1) - ROUTE_GRID_WIDTH - 2;
memset(_routeGrid, 0, ROUTE_GRID_SIZE);
uint8 bitsLeft = 0; uint32 gridData = 0;
for (uint8 gridCntY = 0; gridCntY < ROUTE_GRID_HEIGHT - 2; gridCntY++) {
for (uint8 gridCntX = 0; gridCntX < ROUTE_GRID_WIDTH - 2; gridCntX++) {
if (!bitsLeft) {
screenGrid -= 4;
gridData = READ_LE_UINT32(screenGrid);
bitsLeft = 32;
}
if (gridData & 1) {
*wGridPos = 0xFFFF; // block is not accessible
stretch = width;
} else if (stretch) {
*wGridPos = 0xFFFF;
stretch--;
}
wGridPos--;
bitsLeft--;
gridData >>= 1;
}
wGridPos -= 2;
stretch = 0;
}
}
bool SkyAutoRoute::calcWalkGrid(uint8 startX, uint8 startY, uint8 destX, uint8 destY) {
int16 directionX, directionY;
uint8 roiX, roiY; // Rectangle Of Interest in the walk grid
if (startY > destY) {
directionY = -ROUTE_GRID_WIDTH;
roiY = startY;
} else {
directionY = ROUTE_GRID_WIDTH;
roiY = (ROUTE_GRID_HEIGHT-1) - startY;
}
if (startX > destX) {
directionX = -1;
roiX = startX + 2;
} else {
directionX = 1;
roiX = (ROUTE_GRID_WIDTH - 1) - startX;
}
uint16 *walkDest = _routeGrid + (destY + 1) * ROUTE_GRID_WIDTH + destX + 1;
uint16 *walkStart = _routeGrid + (startY + 1) * ROUTE_GRID_WIDTH + startX + 1;
*walkStart = 1;
// if we are on the edge, move diagonally from start
if (roiY < ROUTE_GRID_HEIGHT-3)
walkStart -= directionY;
if (roiX < ROUTE_GRID_WIDTH-2)
walkStart -= directionX;
bool gridChanged = true;
bool foundRoute = false;
while ((!foundRoute) && gridChanged) {
gridChanged = false;
uint16 *yWalkCalc = walkStart;
for (uint8 cnty = 0; cnty < roiY; cnty++) {
uint16 *xWalkCalc = yWalkCalc;
for (uint8 cntx = 0; cntx < roiX; cntx++) {
if (!*xWalkCalc) { // block wasn't done, yet
uint16 blockRet = checkBlock(xWalkCalc);
if (blockRet < 0xFFFF) {
*xWalkCalc = blockRet + 1;
gridChanged = true;
}
}
xWalkCalc += directionX;
}
yWalkCalc += directionY;
}
if (*walkDest) { // okay, finished
foundRoute = true;
} else { // we couldn't find the route, let's extend the ROI
if (roiY < ROUTE_GRID_HEIGHT - 4) {
walkStart -= directionY;
roiY++;
}
if (roiX < ROUTE_GRID_WIDTH - 4) {
walkStart -= directionX;
roiX++;
}
}
}
return foundRoute;
}
uint16 *SkyAutoRoute::makeRouteData(uint8 startX, uint8 startY, uint8 destX, uint8 destY) {
memset(_routeBuf, 0, ROUTE_SPACE);
uint16 *routePos = _routeGrid + (destY + 1) * ROUTE_GRID_WIDTH + destX + 1;
uint16 *dataTrg = _routeBuf + (ROUTE_SPACE >> 1) - 2;
uint16 lastVal = (*routePos) - 1;
while (lastVal) { // lastVal == 0 means route is done.
dataTrg -= 2;
int16 walkDirection = 0;
for (uint8 cnt = 0; cnt < 4; cnt++)
if (lastVal == *(routePos + _routeDirections[cnt])) {
*(dataTrg + 1) = _logicCommands[cnt];
walkDirection = _routeDirections[cnt];
break;
}
if (!walkDirection)
error("makeRouteData:: can't find way through walkGrid (pos %d)", lastVal);
while (lastVal && (lastVal == *(routePos + walkDirection))) {
*dataTrg += WALK_JUMP;
lastVal--;
routePos += walkDirection;
}
}
return dataTrg;
}
uint16 *SkyAutoRoute::checkInitMove(uint16 *data, int16 initStaX) {
if (initStaX < 0) {
data -= 2;
*(data + 1) = RIGHTY;
*data = ((-initStaX) + 7) & 0xFFF8;
} else if (initStaX > 0) {
data -= 2;
*(data + 1) = LEFTY;
*data = (initStaX + 7) & 0xFFF8;
}
return data;
}
uint16 SkyAutoRoute::autoRoute(Compact *cpt) {
uint8 cptScreen = (uint8)cpt->screen;
uint8 cptWidth = (uint8)SkyCompact::getMegaSet(cpt, cpt->extCompact->megaSet)->gridWidth;
initWalkGrid(cptScreen, cptWidth);
uint8 startX, startY, destX, destY;
int16 initStaX, initStaY, initDestX, initDestY;
clipCoordX(cpt->xcood, startX, initStaX);
clipCoordY(cpt->ycood, startY, initStaY);
clipCoordX(cpt->extCompact->arTargetX, destX, initDestX);
clipCoordY(cpt->extCompact->arTargetY, destY, initDestY);
((uint16*)cpt->extCompact->animScratch)[0] = 0;
if ((startX == destX) && (startY == destY))
return 2;
if (_routeGrid[(destY + 1) * ROUTE_GRID_WIDTH + destX + 1])
return 1; // AR destination is an unaccessible block
if (!calcWalkGrid(startX, startY, destX, destY))
return 1; // can't find route to block
uint16 *routeData = makeRouteData(startX, startY, destX, destY);
// the route is done.
// if there was an initial x movement (due to clipping) tag it onto the start
routeData = checkInitMove(routeData, initStaX);
uint8 cnt = 0;
do {
((uint16*)cpt->extCompact->animScratch)[cnt] = routeData[cnt];
((uint16*)cpt->extCompact->animScratch)[cnt + 1] = routeData[cnt + 1];
cnt += 2;
} while (routeData[cnt - 2]);
return 0;
}
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