mirror of
https://github.com/ZDoom/zdbsp.git
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278 lines
6.8 KiB
Text
278 lines
6.8 KiB
Text
// This is the same algorithm used by DoomBSP:
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//
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// Represent each sector by its bounding box. Then for each pair of
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// sectors, see if any chains of one-sided lines can walk from one
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// side of the convex hull for that pair to the other side.
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//
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// It works, but it's far from being perfect. It's quite easy for
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// this algorithm to consider two sectors as being visible from
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// each other when they are really not. But it won't erroneously
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// flag two sectors as obstructed when they're really not, and that's
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// the only thing that really matters when building a REJECT lump.
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#include <string.h>
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#include <stdio.h>
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#include "zdbsp.h"
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#include "nodebuild.h"
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#include "rejectbuilder.h"
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#include "templates.h"
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FRejectBuilder::FRejectBuilder (FLevel &level)
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: Level (level)
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{
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int i;
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i = Level.NumGLSubsectors * Level.NumGLSubsectors;
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SubSeeMatrix = new BYTE[i];
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memset (SubSeeMatrix, 0, i);
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SegSubsectors = new WORD[Level.NumGLSegs];
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for (i = 0; i < Level.NumGLSubsectors; ++i)
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{
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for (int j = 0; j < Level.GLSubsectors[i].numlines; ++j)
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{
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SegSubsectors[j + Level.GLSubsectors[i].firstline] = i;
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}
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}
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BuildReject ();
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}
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FRejectBuilder::~FRejectBuilder ()
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{
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delete[] SubSeeMatrix;
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delete[] SegSubsectors;
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}
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BYTE *FRejectBuilder::GetReject ()
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{
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int i, j;
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int rejectSize = (Level.NumSectors*Level.NumSectors + 7) / 8;
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BYTE *reject = new BYTE[rejectSize];
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memset (reject, 0xff, rejectSize);
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int pvs_size = (Level.NumGLSubsectors * Level.NumGLSubsectors) + 7 / 8;
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Level.GLPVS = new BYTE[pvs_size];
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Level.GLPVSSize = pvs_size;
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memset (Level.GLPVS, 0, pvs_size);
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for (i = 0; i < Level.NumGLSubsectors; ++i)
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{
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int row = i*Level.NumGLSubsectors;
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int sector1 =
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Level.Sides[
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Level.Lines[
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Level.GLSegs[
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Level.GLSubsectors[i].firstline].linedef]
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.sidenum[
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Level.GLSegs[
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Level.GLSubsectors[i].firstline].side]]
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.sector;
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int srow = sector1*Level.NumSectors;
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for (j = 0; j < Level.NumGLSubsectors; ++j)
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{
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if (SubSeeMatrix[row + j])
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{
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int sector2 =
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Level.Sides[
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Level.Lines[
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Level.GLSegs[
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Level.GLSubsectors[j].firstline].linedef]
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.sidenum[
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Level.GLSegs[
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Level.GLSubsectors[j].firstline].side]]
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.sector;
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int l = (srow + sector2) >> 3;
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int r = (srow + sector2) & 7;
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reject[l] &= ~(1 << r);
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l = (row + j) >> 3;
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r = (row + j) & 7;
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Level.GLPVS[l] |= 1 << r;
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}
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}
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}
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return reject;
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}
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void FRejectBuilder::BuildReject ()
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{
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int s1, s2;
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for (s1 = 0; s1 < Level.NumGLSubsectors; ++s1)
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{
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//printf (" Reject: %3d%%\r",s1*100/Level.NumGLSubsectors);
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printf ("%d/%d\r", s1, Level.NumGLSubsectors);
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// A subsector can always see itself
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SourceRow = s1 * Level.NumGLSubsectors;
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SubSeeMatrix[SourceRow + s1] = 1;
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WORD pusher = s1;
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for (s2 = 0; s2 < Level.GLSubsectors[s1].numlines; ++s2)
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{
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int segnum = s2 + Level.GLSubsectors[s1].firstline;
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const MapSegGL *seg = &Level.GLSegs[segnum];
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if (seg->partner == NO_INDEX)
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{
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continue;
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}
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SourceSeg = segnum;
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SegRow = segnum * Level.NumGLSegs;
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TracePath (s1, seg);
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}
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}
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printf (" Reject: 100%%\n");
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}
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inline const WideVertex *FRejectBuilder::GetVertex (WORD vertnum)
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{
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if (vertnum & 0x8000)
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{
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return &Level.GLVertices[vertnum & 0x7fff];
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}
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else
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{
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return &Level.Vertices[vertnum];
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}
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}
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void FRejectBuilder::TracePath (int subsector, const MapSegGL *window)
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{
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// Neighboring subsectors can always see each other
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SubSeeMatrix[SourceRow + SegSubsectors[window->partner]] = 1;
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const MapSubsector *backsub = &Level.GLSubsectors[SegSubsectors[window->partner]];
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Portal source;
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source.Subsector = backsub;
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source.Left = GetVertex (window->v1);
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source.Right = GetVertex (window->v2);
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PortalStack.Clear ();
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PortalStack.Push (source);
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fixed_t wdx = source.Right->x - source.Left->x;
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fixed_t wdy = source.Right->y - source.Left->y;
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// printf ("start window %d\n", window - Level.GLSegs);
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for (int i = 0; i < backsub->numlines; ++i)
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{
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int segnum = backsub->firstline + i;
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if (segnum == window->partner)
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{
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continue;
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}
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const MapSegGL *cseg = &Level.GLSegs[segnum];
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if (cseg->partner == NO_INDEX)
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{
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continue;
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}
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const WideVertex *cv1 = GetVertex (cseg->v1);
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const WideVertex *cv2 = GetVertex (cseg->v2);
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if (FNodeBuilder::PointOnSide (cv1->x, cv1->y, source.Left->x, source.Left->y, wdx, wdy) == 0 &&
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FNodeBuilder::PointOnSide (cv2->x, cv2->y, source.Left->x, source.Left->y, wdx, wdy) == 0)
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{
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continue;
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}
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TracePathDeep (cseg);
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}
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}
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void FRejectBuilder::TracePathDeep (const MapSegGL *window)
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{
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SubSeeMatrix[SourceRow + SegSubsectors[window->partner]] = 1;
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const MapSubsector *backsub = &Level.GLSubsectors[SegSubsectors[window->partner]];
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size_t j;
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for (j = PortalStack.Size(); j-- > 0; )
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{
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if (PortalStack[j].Subsector == backsub)
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{
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return;
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}
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}
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Portal entrance;
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entrance.Subsector = backsub;
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entrance.Left = GetVertex (window->v1);
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entrance.Right = GetVertex (window->v2);
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PortalStack.Push (entrance);
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fixed_t wdx = entrance.Right->x - entrance.Left->x;
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fixed_t wdy = entrance.Right->y - entrance.Left->y;
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//printf ("deep through %d\n", window - Level.GLSegs);
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for (int i = 0; i < backsub->numlines; ++i)
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{
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int segnum = backsub->firstline + i;
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if (segnum == window->partner)
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{
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continue;
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}
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const MapSegGL *cseg = &Level.GLSegs[segnum];
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if (cseg->partner == NO_INDEX)
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{
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continue;
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}
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const WideVertex *cv1 = GetVertex (cseg->v1);
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const WideVertex *cv2 = GetVertex (cseg->v2);
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if (FNodeBuilder::PointOnSide (cv1->x, cv1->y, entrance.Left->x, entrance.Left->y, wdx, wdy) <= 0 &&
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FNodeBuilder::PointOnSide (cv2->x, cv2->y, entrance.Left->x, entrance.Left->y, wdx, wdy) <= 0)
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{
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continue;
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}
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fixed_t leftx = PortalStack[0].Left->x;
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fixed_t lefty = PortalStack[0].Left->y;
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fixed_t rightx = PortalStack[0].Right->x;
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fixed_t righty = PortalStack[0].Right->y;
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fixed_t leftdx = cv1->x - leftx;
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fixed_t leftdy = cv1->y - lefty;
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fixed_t rightdx = rightx - cv2->x;
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fixed_t rightdy = righty - cv2->y;
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if (FNodeBuilder::PointOnSide (cv1->x, cv1->y, rightx, righty, rightdx, rightdy) >= 0 ||
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FNodeBuilder::PointOnSide (cv2->x, cv2->y, leftx, lefty, leftdx, leftdy) >= 0)
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{
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continue;
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}
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for (j = PortalStack.Size(); j-- > 1; )
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{
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if (FNodeBuilder::PointOnSide (PortalStack[j].Left->x, PortalStack[j].Left->y,
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rightx, righty, rightdx, rightdy) >= 0 ||
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FNodeBuilder::PointOnSide (PortalStack[j].Right->x, PortalStack[j].Right->y,
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leftx, lefty, leftdx, leftdy) >= 0)
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{
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break;
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}
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}
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if (j == 0)
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{
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TracePathDeep (cseg);
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}
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}
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PortalStack.Pop (entrance);
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}
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