- engine-side portal setup for Blood and RRRA.

source/core/rendering/render.h

@@ -3,3 +3,69 @@
 
 void render_drawrooms(spritetype* playersprite, const vec3_t& position, int sectnum, fixed_t q16angle, fixed_t q16horizon, float rollang);
 
+struct PortalDesc
+{
+	int type;
+	int dx, dy, dz;
+	TArray<int> targets;
+};
+
+extern TArray<PortalDesc> allPortals;
+
+inline void portalClear()
+{
+	allPortals.Clear();
+}
+
+inline int portalAdd(int type, int target, int dx = 0, int dy = 0, int dz = 0)
+{
+	auto& pt = allPortals[allPortals.Reserve(1)];
+	pt.type = type;
+	pt.targets.Push(target);
+	pt.dx = dx;
+	pt.dy = dy;
+	pt.dz = dz;
+	return allPortals.Size() - 1;
+}
+
+// merges portals in adjoining sectors. AFAIK the only one of this kind is in Blood's E4M9, which with the original code is very glitchy.
+inline void mergePortals()
+{
+	Printf("Have %d portals\n", allPortals.Size());
+	bool didsomething = true;
+	while (didsomething)
+	{
+		didsomething = false;
+		for (unsigned i = 0; i < allPortals.Size(); i++)
+		{
+			auto& pt1 = allPortals[i];
+			if (pt1.type == PORTAL_SECTOR_CEILING || pt1.type == PORTAL_SECTOR_FLOOR)
+			{
+				for (unsigned j = i + 1; j < allPortals.Size(); j++)
+				{
+					auto& pt2 = allPortals[j];
+					if (pt1.type != pt2.type || pt1.dx != pt2.dx || pt1.dy != pt2.dy || pt1.dz != pt2.dz) continue;
+					for (unsigned s = 0; s < pt1.targets.Size(); s++)
+					{
+						for (unsigned t = 0; t < pt2.targets.Size(); t++)
+						{
+							if (findwallbetweensectors(pt1.targets[s], pt2.targets[t]) >= 0)
+							{
+								pt1.targets.Append(pt2.targets);
+								pt2.targets.Reset();
+								pt2.type = -1;
+								for (int n = 0; n < numsectors; n++)
+								{
+									Printf("Merged %d and %d\n", i, j);
+									if (sector[n].portalnum == j) sector[n].portalnum = i;
+									didsomething = true;
+									break;
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}