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- Fixed the pathfinding issue for LSL5 room 640, where Patti walks off-screen (we still need a proper way of detecting this, though...)

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- Made warnings where invalid pointers are dereferenced more precise

svn-id: r45257
This commit is contained in:
Filippos Karapetis 2009-10-20 10:08:28 +00:00
parent c0f6657797
commit a88aa2f45f
3 changed files with 23 additions and 18 deletions
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24
engines/sci/engine/kpathing.cpp
View file

@ -261,7 +261,7 @@ struct PathfindingState {
static Common::Point read_point(SegManager *segMan, reg_t list, int offset) {
SegmentRef list_r = segMan->dereference(list);
if (!list_r.isValid()) {
warning("Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(list));
warning("read_point(): Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(list));
}
Common::Point point;
@ -854,7 +854,6 @@ static VertexList *visible_vertices(PathfindingState *s, Vertex *vertex_cur) {
return visVerts;
}
#if 0
static bool point_on_screen_border(const Common::Point &p) {
// Determines if a point lies on the screen border
// Parameters: (const Common::Point &) p: The point
@ -862,7 +861,6 @@ static bool point_on_screen_border(const Common::Point &p) {
// FIXME get dimensions from somewhere?
return (p.x == 0) || (p.x == 319) || (p.y == 0) || (p.y == 189);
}
#endif
static bool edge_on_screen_border(const Common::Point &p, const Common::Point &q) {
// Determines if an edge lies on the screen border
@ -1498,7 +1496,7 @@ static int intersecting_polygons(PathfindingState *s) {
return 0;
}
static void dijkstra(PathfindingState *s) {
static void dijkstra(PathfindingState *s, bool avoidScreenEdge) {
// Computes a shortest path from vertex_start to vertex_end. The caller can
// construct the resulting path by following the path_prev links from
// vertex_end back to vertex_start. If no path exists vertex_end->path_prev
@ -1558,13 +1556,12 @@ static void dijkstra(PathfindingState *s) {
uint32 new_dist;
Vertex *vertex = *it;
// Early pathfinding-enabled games exclude edges on screen borders.
// FIXME: Enable this selectively for those games that need it.
#if 0
if (avoidScreenEdge) {
// Avoid plotting path along screen edge
if ((vertex != s->vertex_end) && point_on_screen_border(vertex->v))
continue;
#endif
}
new_dist = vertex_min->dist + (uint32)sqrt((float)vertex_min->v.sqrDist(vertex->v));
if (new_dist < vertex->dist) {
vertex->dist = new_dist;
@ -1715,7 +1712,16 @@ reg_t kAvoidPath(EngineState *s, int argc, reg_t *argv) {
return output;
}
dijkstra(p);
// Early pathfinding-enabled games exclude edges on screen borders.
// FIXME: Enable this selectively for those games that need it.
bool avoidScreenEdge = false;
// This is certainly needed for LSL5 room 640, otherwise Patti walks off-screen
// and reenters through the wall
if (s->_gameName == "lsl5" && s->currentRoomNumber() == 640)
avoidScreenEdge = true;
dijkstra(p, avoidScreenEdge);
output = output_path(p, s);
delete p;

7
engines/sci/engine/seg_manager.cpp
View file

@ -877,7 +877,7 @@ SegmentRef SegManager::dereference(reg_t pointer) {
if (!pointer.segment || (pointer.segment >= _heap.size()) || !_heap[pointer.segment]) {
// This occurs in KQ5CD when interacting with certain objects
warning("Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(pointer));
warning("SegManager::dereference(): Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(pointer));
return ret; /* Invalid */
}
@ -1158,12 +1158,11 @@ size_t SegManager::strlen(reg_t str) {
}
Common::String SegManager::getString(reg_t pointer, int entries)
{
Common::String SegManager::getString(reg_t pointer, int entries) {
Common::String ret;
SegmentRef src_r = dereference(pointer);
if (!src_r.isValid()) {
warning("Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(pointer));
warning("SegManager::getString(): Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(pointer));
return ret;
}
if (entries > src_r.maxSize) {

4
engines/sci/engine/segment.cpp
View file

@ -222,7 +222,7 @@ bool Script::isValidOffset(uint16 offset) const {
SegmentRef Script::dereference(reg_t pointer) {
if (pointer.offset > _bufSize) {
warning("Attempt to dereference invalid pointer %04x:%04x into script segment (script size=%d)",
warning("Script::dereference(): Attempt to dereference invalid pointer %04x:%04x into script segment (script size=%d)",
PRINT_REG(pointer), (uint)_bufSize);
return SegmentRef();
}
@ -299,7 +299,7 @@ SegmentRef SystemStrings::dereference(reg_t pointer) {
ret.raw = (byte *)(_strings[pointer.offset]._value);
else {
// This occurs in KQ5CD when interacting with certain objects
warning("Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(pointer));
warning("SystemStrings::dereference(): Attempt to dereference invalid pointer %04x:%04x", PRINT_REG(pointer));
}
return ret;