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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.
*
*/
#include "dreamweb/dreamweb.h"
namespace DreamGen {
void DreamGenContext::turnPathOn() {
turnPathOn(al);
}
void DreamGenContext::turnPathOn(uint8 param) {
findOrMake(param, 0xff, data.byte(kRoomnum) + 100);
PathNode *roomsPaths = getRoomsPaths()->nodes;
if (param == 0xff)
return;
roomsPaths[param].on = 0xff;
}
void DreamGenContext::turnPathOff() {
turnPathOff(al);
}
void DreamGenContext::turnPathOff(uint8 param) {
findOrMake(param, 0x00, data.byte(kRoomnum) + 100);
PathNode *roomsPaths = getRoomsPaths()->nodes;
if (param == 0xff)
return;
roomsPaths[param].on = 0x00;
}
void DreamGenContext::turnAnyPathOn(uint8 param, uint8 room) {
findOrMake(param, 0xff, room + 100);
PathNode *paths = (PathNode *)getSegment(data.word(kReels)).ptr(kPathdata + 144 * room, 0);
paths[param].on = 0xff;
}
void DreamGenContext::turnAnyPathOn() {
turnAnyPathOn(al, ah);
}
void DreamGenContext::turnAnyPathOff(uint8 param, uint8 room) {
findOrMake(param, 0x00, room + 100);
PathNode *paths = (PathNode *)getSegment(data.word(kReels)).ptr(kPathdata + 144 * room, 0);
paths[param].on = 0x00;
}
void DreamGenContext::turnAnyPathOff() {
turnAnyPathOff(al, ah);
}
RoomPaths *DreamBase::getRoomsPaths() {
void *result = getSegment(data.word(kReels)).ptr(data.byte(kRoomnum) * 144, 144);
return (RoomPaths *)result;
}
void DreamBase::faceRightWay() {
PathNode *paths = getRoomsPaths()->nodes;
uint8 dir = paths[data.byte(kManspath)].dir;
data.byte(kTurntoface) = dir;
data.byte(kLeavedirection) = dir;
}
void DreamBase::setWalk() {
if (data.byte(kLinepointer) != 254) {
// Already walking
data.byte(kFinaldest) = data.byte(kPointerspath);
} else if (data.byte(kPointerspath) == data.byte(kManspath)) {
// Can't walk
faceRightWay();
} else if (data.byte(kWatchmode) == 1) {
// Holding reel
data.byte(kDestafterhold) = data.byte(kPointerspath);
data.byte(kWatchmode) = 2;
} else if (data.byte(kWatchmode) == 2) {
// Can't walk
} else {
data.byte(kDestination) = data.byte(kPointerspath);
data.byte(kFinaldest) = data.byte(kPointerspath);
if (data.word(kMousebutton) != 2 || data.word(kCommandtype) == 3) {
autoSetWalk();
} else {
data.byte(kWalkandexam) = 1;
data.byte(kWalkexamtype) = data.byte(kCommandtype);
data.byte(kWalkexamnum) = data.byte(kCommand);
autoSetWalk();
}
}
}
void DreamBase::autoSetWalk() {
if (data.byte(kFinaldest) == data.byte(kManspath))
return;
const RoomPaths *roomsPaths = getRoomsPaths();
checkDest(roomsPaths);
data.word(kLinestartx) = roomsPaths->nodes[data.byte(kManspath)].x - 12;
data.word(kLinestarty) = roomsPaths->nodes[data.byte(kManspath)].y - 12;
data.word(kLineendx) = roomsPaths->nodes[data.byte(kDestination)].x - 12;
data.word(kLineendy) = roomsPaths->nodes[data.byte(kDestination)].y - 12;
bresenhams();
if (data.byte(kLinedirection) != 0) {
data.byte(kLinepointer) = data.byte(kLinelength) - 1;
data.byte(kLinedirection) = 1;
return;
}
data.byte(kLinepointer) = 0;
}
void DreamBase::checkDest(const RoomPaths *roomsPaths) {
const PathSegment *segments = roomsPaths->segments;
const uint8 tmp = data.byte(kManspath) << 4;
uint8 destination = data.byte(kDestination);
for (size_t i = 0; i < 24; ++i) {
if ((segments[i].b0 & 0xf0) == tmp &&
(segments[i].b0 & 0x0f) == data.byte(kDestination)) {
data.byte(kDestination) = segments[i].b1 & 0x0f;
return;
}
if (((segments[i].b0 & 0x0f) << 4) == tmp &&
((segments[i].b0 & 0xf0) >> 4) == data.byte(kDestination)) {
destination = segments[i].b1 & 0x0f;
}
}
data.byte(kDestination) = destination;
}
void DreamBase::findXYFromPath() {
const PathNode *roomsPaths = getRoomsPaths()->nodes;
data.byte(kRyanx) = roomsPaths[data.byte(kManspath)].x - 12;
data.byte(kRyany) = roomsPaths[data.byte(kManspath)].y - 12;
}
void DreamGenContext::checkIfPathIsOn() {
flags._z = checkIfPathIsOn(al);
}
bool DreamGenContext::checkIfPathIsOn(uint8 index) {
RoomPaths *roomsPaths = getRoomsPaths();
uint8 pathOn = roomsPaths->nodes[index].on;
return pathOn == 0xff;
}
void DreamBase::bresenhams() {
workoutFrames();
Common::Point *lineData = &_lineData[0];
int16 startX = (int16)data.word(kLinestartx);
int16 startY = (int16)data.word(kLinestarty);
int16 endX = (int16)data.word(kLineendx);
int16 endY = (int16)data.word(kLineendy);
if (endX == startX) {
uint16 deltaY;
int8 y;
if (endY < startY) {
deltaY = startY - endY;
y = (int8)endY;
data.byte(kLinedirection) = 1;
} else {
deltaY = endY - startY;
y = (int8)startY;
data.byte(kLinedirection) = 0;
}
++deltaY;
int8 x = (int8)startX;
data.byte(kLinelength) = deltaY;
for (; deltaY; --deltaY) {
lineData->x = x;
lineData->y = y;
++lineData;
++y;
}
return;
}
uint16 deltaX;
if (endX < startX) {
deltaX = startX - endX;
SWAP(startX, endX);
SWAP(startY, endY);
data.word(kLinestartx) = (uint16)startX;
data.word(kLinestarty) = (uint16)startY;
data.word(kLineendx) = (uint16)endX;
data.word(kLineendy) = (uint16)endY;
data.byte(kLinedirection) = 1;
} else {
deltaX = endX - startX;
data.byte(kLinedirection) = 0;
}
int16 increment;
if (endY == startY) {
int8 x = (int8)startX;
int8 y = (int8)startY;
++deltaX;
data.byte(kLinelength) = deltaX;
for (; deltaX; --deltaX) {
lineData->x = x;
lineData->y = y;
++lineData;
++x;
}
return;
}
uint16 deltaY;
if (startY > endY) {
deltaY = startY - endY;
increment = -1;
} else {
deltaY = endY - startY;
increment = 1;
}
uint16 delta1, delta2;
if (deltaY > deltaX) {
data.byte(kLineroutine) = 1;
delta1 = deltaY;
delta2 = deltaX;
} else {
data.byte(kLineroutine) = 0;
delta1 = deltaX;
delta2 = deltaY;
}
data.word(kIncrement1) = delta2 * 2;
int16 remainder = delta2 * 2 - delta1;
data.word(kIncrement2) = delta2 * 2 - delta1 * 2;
++delta1;
int8 x = (int8)startX;
int8 y = (int8)startY;
data.byte(kLinelength) = delta1;
if (data.byte(kLineroutine) != 1) {
for (; delta1; --delta1) {
lineData->x = x;
lineData->y = y;
++lineData;
++x;
if (remainder < 0) {
remainder += data.word(kIncrement1);
} else {
remainder += data.word(kIncrement2);
y += increment;
}
}
} else {
for (; delta1; --delta1) {
lineData->x = x;
lineData->y = y;
++lineData;
y += increment;
if (remainder < 0) {
remainder += data.word(kIncrement1);
} else {
remainder += data.word(kIncrement2);
++x;
}
}
}
}
void DreamBase::workoutFrames() {
byte tmp;
int diffx, diffy;
// We have to use signed arithmetic here because these values can
// be slightly negative when walking off-screen
int lineStartX = (int16)data.word(kLinestartx);
int lineStartY = (int16)data.word(kLinestarty);
int lineEndX = (int16)data.word(kLineendx);
int lineEndY = (int16)data.word(kLineendy);
diffx = ABS(lineStartX - lineEndX);
diffy = ABS(lineStartY - lineEndY);
if (diffx < diffy) {
tmp = 2;
if (diffx >= (diffy >> 1))
tmp = 1;
} else {
// tendstohoriz
tmp = 0;
if (diffy >= (diffx >> 1))
tmp = 1;
}
if (lineStartX >= lineEndX) {
// isinleft
if (lineStartY < lineEndY) {
if (tmp != 1)
tmp ^= 2;
tmp += 4;
} else {
// topleft
tmp += 6;
}
} else {
// isinright
if (lineStartY < lineEndY) {
tmp += 2;
} else {
// botright
if (tmp != 1)
tmp ^= 2;
}
}
data.byte(kTurntoface) = tmp & 7;
data.byte(kTurndirection) = 0;
}
} // End of namespace DreamGen
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