mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-29 21:24:53 +00:00
361 lines
8.4 KiB
C++
361 lines
8.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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/*
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TODO:
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- rewrite functions (GetShortestPath etc.)
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*/
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#include "graphics/primitives.h"
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#include "common/list.h"
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#include "common/rect.h"
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#include "common/util.h"
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#include "m4/rails.h"
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#include "m4/m4.h"
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namespace M4 {
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#define TOP_EDGE 1 << 0
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#define LEFT_EDGE 1 << 1
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#define BOTTOM_EDGE 1 << 2
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#define RIGHT_EDGE 1 << 3
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Rails::Rails() {
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}
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Rails::~Rails() {
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clearRails();
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}
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void Rails::clearRails() {
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uint32 i;
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Common::List<NoWalkRect *>::iterator j;
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RailNode *tempNode;
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for (i = 0; i < _nodes.size(); i++) {
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tempNode = _nodes[i];
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_nodes.remove_at(i);
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delete tempNode;
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}
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for (i = 0; i < _edges.size(); i++) {
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_edges.remove_at(i);
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}
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for (j = _noWalkRects.begin(); j != _noWalkRects.end(); ++j)
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delete (*j);
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_noWalkRects.clear();
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}
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static void checkPoint(int x, int y, int color, void *data) {
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IsWalkableData *isWalkableData = (IsWalkableData*)data;
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if (!isWalkableData->result)
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return;
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else {
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M4Surface *codes = isWalkableData->codes;
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if (x >= 0 && x < codes->w && y >= 0 && y < codes->h) {
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isWalkableData->result = !((*((uint8*)codes->getBasePtr(x, y))) & 0x10);
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} else {
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isWalkableData->result = false;
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}
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}
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}
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bool Rails::isLineWalkable(int x0, int y0, int x1, int y1) {
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IsWalkableData isWalkableData;
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isWalkableData.codes = _walkCodes;
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isWalkableData.result = true;
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Graphics::drawLine(x0, y0, x1, y1, 0, &checkPoint, &isWalkableData);
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return isWalkableData.result;
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}
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// helper function
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uint8 getEndCode(int32 x, int32 y, Common::Rect rect) {
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uint8 endCode = 0;
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endCode = (x < rect.left) ? LEFT_EDGE : endCode;
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endCode = (x > rect.right) ? RIGHT_EDGE : endCode;
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endCode = (y < rect.top) ? endCode | TOP_EDGE : endCode;
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endCode = (y > rect.bottom) ? endCode | BOTTOM_EDGE : endCode;
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return endCode;
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}
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bool Rails::lineCrossesRect(int32 x1, int32 y1, int32 x2, int32 y2, Common::Rect rect) {
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int32 mX, mY;
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int32 pX1 = x1, pX2 = x2, pY1 = y1, pY2 = y2;
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uint8 endCode1, endCode2, midCode;
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if (rect.left > rect.right || rect.top > rect.bottom)
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return false;
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// Cohen-Sutherland line clipping algorithm
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endCode1 = getEndCode(pX1, pY1, rect);
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endCode2 = getEndCode(pX2, pY2, rect);
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if (!endCode1 || !endCode2) // if both endcodes are zero
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return true; // point is inside the rectangle, therefore the line intersects
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while (true) {
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if (endCode1 & endCode2) // if both endcodes have a common bitset
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return false; // line is completely off one edge
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// calculate midpoint
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mX = (pX1 + pX2)>>1;
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mY = (pY1 + pY2)>>1;
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// avoid round-off error: make sure that the midpoint isn't the same as one of the
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// two endpoints
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if (((mX == pX1) && (mY == pY1)) || ((mX == pX2) && (mY == pY2)))
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return false;
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midCode = getEndCode(mX, mY, rect);
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if (!midCode) {
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return true;
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} else if (midCode & endCode1) {
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// the midCode and an end point form a line segment completely off one edge, so
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// remove that half of the line segment
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pX1 = mX;
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pY1 = mY;
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endCode1 = midCode;
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} else {
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pX2 = mX;
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pY2 = mY;
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endCode2 = midCode;
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}
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}
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}
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bool Rails::linePassesThroughRect(int32 x1, int32 y1, int32 x2, int32 y2) {
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if (_noWalkRects.empty())
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return false;
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bool intersected = false;
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Common::List<NoWalkRect *>::iterator i;
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for (i = _noWalkRects.begin(); i != _noWalkRects.end(); ++i) {
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intersected = lineCrossesRect(x1, y1, x2, y2, Common::Rect((*i)->x1, (*i)->y1, (*i)->x2, (*i)->y2));
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if (intersected)
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break;
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}
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return intersected;
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}
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long SqrtF16(long n) {
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uint32 r = 0, s;
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uint32 v = (uint32)n;
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for (int i = 15; i <= 0; i--) {
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s = r + (1L << i * 2);
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r >>= 1;
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if (s <= v) {
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v -= s;
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r |= (1L << i * 2);
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}
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}
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return (long)r;
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}
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void Rails::createEdge(int32 node1, int32 node2) {
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uint32 index;
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int32 x1, y1, x2, y2;
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bool valid, finished;
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long deltaX, deltaY, distance;
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uint8 *walkCodePtr;
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if ((node1 < 0) || (node1 >= MAXRAILNODES) || (node2 < 0) || (node2 >= MAXRAILNODES))
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return;
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if (node1 == node2)
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return;
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if (node2 < node1)
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SWAP(node1, node2); // ensure node1 < node2
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// Find the table entry i.e. tableWidth * node1 + node2 and then subtract
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// n(n+1)/2, since only the upper triangle of the table is stored
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index = (MAXRAILNODES-1) * node1 + node2 - 1 - (node1*(node1+1)>>1);
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if (index > _edges.size() - 1)
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_edges.resize(index + 1);
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_edges.insert_at(index, 0);
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valid = true;
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walkCodePtr = NULL;
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finished = false;
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if (_nodes.size() <= (uint32)node1 || _nodes.size() <= (uint32)node2)
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return;
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x1 = _nodes[node1]->x;
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y1 = _nodes[node1]->y;
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x2 = _nodes[node2]->x;
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y2 = _nodes[node2]->y;
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// Make sure that the algorithm is symmetric
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if (x2 < x1) {
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SWAP(x1, x2);
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SWAP(y1, y2);
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}
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valid = isLineWalkable(_nodes[node1]->x, _nodes[node1]->y,
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_nodes[node2]->x, _nodes[node2]->y);
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printf("test code says: %d\n", valid);
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// Check if the line passes through a forbidden rectangle
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if (valid) {
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if (linePassesThroughRect(x1, y1, x2, y2)) {
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valid = false;
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}
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}
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if (valid) {
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deltaX = ABS(((long)(x2 - x1)) << 16);
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deltaY = ABS(((long)(y2 - y1)) << 16);
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if ((deltaX >= 0x800000) || (deltaY >= 0x800000)) {
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deltaX >>= 16;
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deltaY >>= 16;
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distance = (long)(SqrtF16(deltaX * deltaX + deltaY * deltaY) << 16);
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} else {
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distance = SqrtF16(FixedMul(deltaX, deltaX) + FixedMul(deltaY, deltaY)) << 8;
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}
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_edges.insert_at(index, (int16*)(distance >> 16));
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}
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printf("node1 = %d, node2 = %d, valid = %d\n", node1, node2, valid);
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}
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void Rails::restoreNodeEdges(int32 nodeID) {
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for (int32 i = 0; i < MAXRAILNODES; i++) {
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createEdge(i, nodeID);
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}
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}
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void Rails::restoreEdgeList() {
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int32 j;
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for (int32 i = 0; i < MAXRAILNODES; i++) {
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for (j = i + 1; j < MAXRAILNODES; j++) {
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createEdge(i, j);
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}
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}
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}
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int32 Rails::addRailNode(int32 x, int32 y, bool restoreEdges) {
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uint32 i = _nodes.size();
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if (i >= MAXRAILNODES)
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return -1;
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RailNode *newNode = new RailNode();
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newNode->nodeID = i;
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newNode->x = x;
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newNode->y = y;
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_nodes.insert_at(i, newNode);
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if (restoreEdges) {
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for (uint32 j=0; j<_nodes.size(); j++)
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createEdge(i, j);
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}
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return i;
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}
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bool Rails::removeRailNode(int32 nodeID, bool restoreEdges) {
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if (nodeID < 0 || nodeID >= MAXRAILNODES)
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return false;
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if (_nodes.empty() || _edges.empty())
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return false;
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RailNode *tempNode = _nodes[nodeID];
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_nodes.remove_at(nodeID);
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delete tempNode;
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if (restoreEdges) {
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restoreNodeEdges(nodeID);
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}
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return true;
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}
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int16 Rails::getEdgeLength(int32 node1, int32 node2) {
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int32 index;
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if (_edges.empty() || node1 == node2)
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return 0;
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if (node2 < node1)
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SWAP(node1, node2);
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// Find the table entry i.e. tableWidth * node1 + node2 and then subtract
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// n(n+1)/2, since only the upper triangle of the table is stored
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index = (MAXRAILNODES-1)*node1 + node2 - 1 - (node1*(node1+1)>>1);
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return *_edges[index];
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}
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void Rails::disposePath(RailNode *pathStart) {
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RailNode *tempNode = pathStart;
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while (tempNode) {
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pathStart = pathStart->shortPath;
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delete tempNode;
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tempNode = pathStart;
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}
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}
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/*
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static RailNode* duplicatePath(RailNode *pathStart) {
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RailNode *newNode = NULL;
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RailNode *firstNode = NULL;
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RailNode *prevNode = NULL;
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// A valid path is assumed
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RailNode *pathNode = pathStart;
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while (pathNode) {
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newNode = new RailNode();
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newNode->x = pathNode->x;
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newNode->y = pathNode->y;
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newNode->shortPath = NULL;
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if (!firstNode)
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firstNode = newNode;
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else
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prevNode->shortPath = newNode;
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prevNode = newNode;
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// Get the next node
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pathNode = pathNode->shortPath;
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}
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return firstNode;
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}
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*/
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bool Rails::getShortestPath(int32 origID, int32 destID, RailNode **shortPath) {
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// TODO
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return true;
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}
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} // End of namespace M4
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