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Skip CheckProximityWall when newSectCheckMethod is set 

Fixes edge case where CheckProximityWall misses
This commit is contained in:
carnivoroussociety 2021-08-26 09:16:09 +10:00 committed by Christoph Oelckers
parent 6d06f063f6
commit 03e6bb3696
1 changed files with 22 additions and 11 deletions
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33
source/games/blood/src/gameutil.cpp
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@ -869,8 +869,12 @@ int GetClosestSpriteSectors(int nSector, int x, int y, int nDist, uint8_t *pSect
if (TestBitString(sectbits, nNextSector)) // if we've already checked this sector, skip
continue;
bool setSectBit = true;
bool withinRange = CheckProximityWall(pWall->point2, x, y, nDist);
if (newSectCheckMethod && !withinRange) // if range check failed, try comparing midpoints/subdivides of wall span
bool withinRange = false;
if (!newSectCheckMethod) // original method
{
withinRange = CheckProximityWall(pWall->point2, x, y, nDist);
}
else // new method - first test edges and then wall span midpoints
{
for (int k = (j+1); k < nEndWall; k++) // scan through the rest of the sector's walls
{
@ -884,27 +888,34 @@ int GetClosestSpriteSectors(int nSector, int x, int y, int nDist, uint8_t *pSect
const int nWallB = wall[nWallA].point2;
int x1 = wall[nWallA].x, y1 = wall[nWallA].y;
int x2 = wall[nWallB].x, y2 = wall[nWallB].y;
int point1Dist = approxDist(x-x1, y-y1); // setup edge distance needed for below loop (determines which point to shift closer to center)
int point2Dist = approxDist(x-x2, y-y2);
int nLength = approxDist(x1-x2, y1-y2);
const int nDist2 = (nDist+(nDist>>1))<<4;
nLength = ClipRange(nLength / nDist2, 1, 4); // never split more than 4 times
for (int k = 0; true; k++) // subdivide span into smaller chunks towards direction
const int nDist4 = nDist<<4;
nLength = ClipRange(nLength / (nDist4+(nDist4>>1)), 1, 4); // always test midpoint at least once, and never split more than 4 times
for (int k = 0; true; k++) // check both points of wall and subdivide span into smaller chunks towards target
{
const int xcenter = (x1+x2)>>1, ycenter = (y1+y2)>>1;
withinRange = CheckProximityPoint(xcenter, ycenter, 0, x, y, 0, nDist);
withinRange = (point1Dist < nDist4) || (point2Dist < nDist4); // check if both points of span is within radius
if (withinRange)
break;
if (k == (nLength-1)) // reached end
if (k == nLength) // reached end
break;
const bool bDir = approxDist(x-x1, y-y1) < approxDist(x-x2, y-y2);
if (bDir) // step closer and check again
const int xcenter = (x1+x2)>>1, ycenter = (y1+y2)>>1;
if (point1Dist < point2Dist) // shift closest side of wall towards target point, and refresh point distance values
{
x2 = xcenter, y2 = ycenter;
point2Dist = approxDist(x-x2, y-y2);
}
else
{
x1 = xcenter, y1 = ycenter;
point1Dist = approxDist(x-x1, y-y1);
}
}
}
if (withinRange) // if new sector is within range, set to current sector and test walls
{
setSectBit = true; // sector is within range, set as checked
setSectBit = true; // sector is within range, set the sector as checked
if (pSectBit)
SetBitString(pSectBit, nNextSector);
pSectors[n++] = nNextSector;