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AGS: Engine: fix legacy pathfinder imprecision in some old games

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This complements c3a0553e25
adding a configurable parameter. There are no functional differences

From upstream 1c226816e2c3c9c18c3afb976e05535401fc5db4
This commit is contained in:
Walter Agazzi 2024-05-03 17:24:08 +02:00
parent ea5ccff782
commit 853c225331
1 changed files with 39 additions and 27 deletions
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66
engines/ags/engine/ac/route_finder_impl_legacy.cpp
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@ -61,6 +61,18 @@ static int suggestx;
static int suggesty;
static int line_failed = 0;
// Configuration for the pathfinder
struct PathfinderConfig {
const int MaxGranularity = 3;
// Short sweep is performed in certain radius around requested destination,
// when searching for a nearest walkable area in the vicinity
const int ShortSweepRadius = 50;
int ShortSweepGranularity = 3; // variable, depending on loaded game version
// Full sweep is performed over a whole walkable area
const int FullSweepGranularity = 5;
};
void init_pathfinder() {
pathbackx = (int *)malloc(sizeof(int) * MAXPATHBACK);
pathbacky = (int *)malloc(sizeof(int) * MAXPATHBACK);
@ -138,9 +150,8 @@ int find_nearest_walkable_area(Bitmap *tempw, int fromX, int fromY, int toX, int
return 0;
}
#define MAX_GRANULARITY 3
static int walk_area_granularity[MAX_WALK_AREAS + 1];
static int is_route_possible(int fromx, int fromy, int tox, int toy, Bitmap *wss) {
static int is_route_possible(int fromx, int fromy, int tox, int toy, Bitmap *wss, const PathfinderConfig &pfc) {
_G(wallscreen) = wss;
suggestx = -1;
@ -203,41 +214,37 @@ static int is_route_possible(int fromx, int fromy, int tox, int toy, Bitmap *wss
// find the average "width" of a path in this walkable area
for (dd = 1; dd <= MAX_WALK_AREAS; dd++) {
if (walk_area_times[dd] == 0) {
walk_area_granularity[dd] = MAX_GRANULARITY;
walk_area_granularity[dd] = pfc.MaxGranularity;
continue;
}
walk_area_granularity[dd] /= walk_area_times[dd];
if (walk_area_granularity[dd] <= 4)
walk_area_granularity[dd] = 2;
// NB: Since MAX_GRANULARITY is 3, the following code is redundant causing compiler warnings
// NB: Since pfc.MaxGranularity is 3, the following code is redundant causing compiler warnings
#if 0
else if (walk_area_granularity[dd] <= 15)
walk_area_granularity[dd] = 3;
#endif
else
walk_area_granularity[dd] = MAX_GRANULARITY;
walk_area_granularity[dd] = pfc.MaxGranularity;
#ifdef DEBUG_PATHFINDER
AGS::Shared::Debug::Printf("area %d: Gran %d", dd, walk_area_granularity[dd]);
#endif
}
walk_area_granularity[0] = MAX_GRANULARITY;
walk_area_granularity[0] = pfc.MaxGranularity;
tempw->FloodFill(fromx, fromy, 232);
if (tempw->GetPixel(tox, toy) != 232) {
// Destination pixel is not walkable
// Try the 100x100 square around the target first at 3-pixel granularity
int tryFirstX = tox - 50, tryToX = tox + 50;
int tryFirstY = toy - 50, tryToY = toy + 50;
// Try the N x N square around the target first at 3-pixel granularity
int tryFirstX = tox - pfc.ShortSweepRadius, tryToX = tox + pfc.ShortSweepRadius;
int tryFirstY = toy - pfc.ShortSweepRadius, tryToY = toy + pfc.ShortSweepRadius;
// This is a fix for the Treppenbug in old (pre-3.0) Maniac Mansion Mania games.
// Using a higher granularity the find_nearest_walkable_area sets a wrong coordinate that prevents
// the staircase in Bernard's home from working.
int sweep_granularity = _G(loaded_game_file_version) > kGameVersion_272 ? 3 : 1;
if (!find_nearest_walkable_area(tempw, tryFirstX, tryFirstY, tryToX, tryToY, tox, toy, sweep_granularity)) {
if (!find_nearest_walkable_area(tempw, tryFirstX, tryFirstY, tryToX, tryToY, tox, toy, pfc.ShortSweepGranularity)) {
// Nothing found, sweep the whole room at 5 pixel granularity
find_nearest_walkable_area(tempw, 0, 0, tempw->GetWidth(), tempw->GetHeight(), tox, toy, 5);
find_nearest_walkable_area(tempw, 0, 0, tempw->GetWidth(), tempw->GetHeight(), tox, toy, pfc.FullSweepGranularity);
}
delete tempw;
@ -401,7 +408,7 @@ static void round_down_coords(int &tmpx, int &tmpy) {
}
}
static int find_route_dijkstra(int fromx, int fromy, int destx, int desty) {
static int find_route_dijkstra(int fromx, int fromy, int destx, int desty, const PathfinderConfig &pfc) {
int i, j;
assert(_G(wallscreen) != nullptr);
@ -437,10 +444,10 @@ static int find_route_dijkstra(int fromx, int fromy, int destx, int desty) {
int granularity = 3, newx = -1, newy, foundAnswer = -1, numreplace;
int changeiter, numfound, adjcount;
int destxlow = destx - MAX_GRANULARITY;
int destylow = desty - MAX_GRANULARITY;
int destxhi = destxlow + MAX_GRANULARITY * 2;
int destyhi = destylow + MAX_GRANULARITY * 2;
int destxlow = destx - pfc.MaxGranularity;
int destylow = desty - pfc.MaxGranularity;
int destxhi = destxlow + pfc.MaxGranularity * 2;
int destyhi = destylow + pfc.MaxGranularity * 2;
int modifier = 0;
int totalfound = 0;
int DIRECTION_BONUS = 0;
@ -507,10 +514,10 @@ static int find_route_dijkstra(int fromx, int fromy, int destx, int desty) {
// edges of screen pose a problem, so if current and dest are within
// certain distance of the edge, say we've got it
if ((newx >= _G(wallscreen)->GetWidth() - MAX_GRANULARITY) && (destx >= _G(wallscreen)->GetWidth() - MAX_GRANULARITY))
if ((newx >= _G(wallscreen)->GetWidth() - pfc.MaxGranularity) && (destx >= _G(wallscreen)->GetWidth() - pfc.MaxGranularity))
newx = destx;
if ((newy >= _G(wallscreen)->GetHeight() - MAX_GRANULARITY) && (desty >= _G(wallscreen)->GetHeight() - MAX_GRANULARITY))
if ((newy >= _G(wallscreen)->GetHeight() - pfc.MaxGranularity) && (desty >= _G(wallscreen)->GetHeight() - pfc.MaxGranularity))
newy = desty;
// Found the desination, abort loop
@ -582,7 +589,7 @@ static int find_route_dijkstra(int fromx, int fromy, int destx, int desty) {
return 1;
}
static int __find_route(int srcx, int srcy, short *tox, short *toy, int noredx) {
static int __find_route(int srcx, int srcy, short *tox, short *toy, int noredx, const PathfinderConfig &pfc) {
assert(_G(wallscreen) != nullptr);
assert(beenhere != nullptr);
assert(tox != nullptr);
@ -602,7 +609,7 @@ findroutebk:
return 1;
}
if ((waspossible = is_route_possible(srcx, srcy, tox[0], toy[0], _G(wallscreen))) == 0) {
if ((waspossible = is_route_possible(srcx, srcy, tox[0], toy[0], _G(wallscreen), pfc)) == 0) {
if (suggestx >= 0) {
tox[0] = suggestx;
toy[0] = suggesty;
@ -618,7 +625,7 @@ findroutebk:
}
// Try the new pathfinding algorithm
if (find_route_dijkstra(srcx, srcy, tox[0], toy[0])) {
if (find_route_dijkstra(srcx, srcy, tox[0], toy[0], pfc)) {
return 1;
}
@ -729,6 +736,11 @@ int find_route(short srcx, short srcy, short xx, short yy, int move_speed_x, int
assert(pathbackx != nullptr);
assert(pathbacky != nullptr);
// Setup pathfinder configuration, depending on the loaded game version;
// sweep granularity has changed between 3.0.0 and 3.0.1; see issue #663
PathfinderConfig pfc;
pfc.ShortSweepGranularity = (_G(loaded_game_file_version) > kGameVersion_300) ? 3 : 1;
#ifdef DEBUG_PATHFINDER
// __wnormscreen();
#endif
@ -761,9 +773,9 @@ int find_route(short srcx, short srcy, short xx, short yy, int move_speed_x, int
for (aaa = 1; aaa < _G(wallscreen)->GetHeight(); aaa++)
beenhere[aaa] = beenhere[0] + aaa * (_G(wallscreen)->GetWidth());
if (__find_route(srcx, srcy, &xx, &yy, nocross) == 0) {
if (__find_route(srcx, srcy, &xx, &yy, nocross, pfc) == 0) {
leftorright = 1;
if (__find_route(srcx, srcy, &xx, &yy, nocross) == 0)
if (__find_route(srcx, srcy, &xx, &yy, nocross, pfc) == 0)
pathbackstage = -1;
}
free(beenhere[0]);