- copied over some stuff from the abandoned portals branch.

src/gl/scene/gl_fakeflat.cpp

@@ -212,6 +212,8 @@ sector_t * gl_FakeFlat(sector_t * sec, sector_t * dest, area_t in_area, bool bac
 				dest->ceilingplane=sec->floorplane;
 				dest->ceilingplane.FlipVert();
 				dest->planes[sector_t::ceiling].TexZ = dest->planes[sector_t::floor].TexZ;
+				dest->portals[sector_t::ceiling] = NULL;
+				dest->portals[sector_t::floor] = NULL;
 				return dest;
 			}
 		}

src/gl/scene/gl_flats.cpp

@@ -525,8 +525,15 @@ void GLFlat::ProcessSector(sector_t * frontsector)
 		Colormap=frontsector->ColorMap;
 		if ((stack = (frontsector->portals[sector_t::floor] != NULL)))
 		{
-			gl_drawinfo->AddFloorStack(sector);
+			if (!frontsector->PortalBlocksView(sector_t::floor))
-			alpha = frontsector->GetAlpha(sector_t::floor)/65536.0f;
+			{
+				gl_drawinfo->AddFloorStack(sector);
+				alpha = frontsector->GetAlpha(sector_t::floor) / 65536.0f;
+			}
+			else
+			{
+				alpha = 1.f;
+			}
 		}
 		else
 		{
@@ -576,8 +583,15 @@ void GLFlat::ProcessSector(sector_t * frontsector)
 		Colormap=frontsector->ColorMap;
 		if ((stack = (frontsector->portals[sector_t::ceiling] != NULL))) 
 		{
-			gl_drawinfo->AddCeilingStack(sector);
+			if (!frontsector->PortalBlocksView(sector_t::ceiling))
-			alpha = frontsector->GetAlpha(sector_t::ceiling)/65536.0f;
+			{
+				gl_drawinfo->AddCeilingStack(sector);
+				alpha = frontsector->GetAlpha(sector_t::ceiling) / 65536.0f;
+			}
+			else
+			{
+				alpha = 1.f;
+			}
 		}
 		else
 		{

src/gl/scene/gl_sky.cpp

@@ -142,6 +142,8 @@ void GLWall::SkyPlane(sector_t *sector, int plane, bool allowreflect)
 	FPortal *portal = sector->portals[plane];
 	if (portal != NULL)
 	{
+		if (sector->PortalBlocksView(plane)) return;
+
 		if (GLPortal::instack[1 - plane]) return;
 		ptype = PORTALTYPE_SECTORSTACK;
 		this->portal = portal;
@@ -302,8 +304,6 @@ void GLWall::SkyTop(seg_t * seg,sector_t * fs,sector_t * bs,vertex_t * v1,vertex
 	}
 	else 
 	{
-		FPortal *pfront = fs->portals[sector_t::ceiling];
-		FPortal *pback = bs->portals[sector_t::ceiling];
 		float frontreflect = fs->GetReflect(sector_t::ceiling);
 		if (frontreflect > 0)
 		{
@@ -314,9 +314,12 @@ void GLWall::SkyTop(seg_t * seg,sector_t * fs,sector_t * bs,vertex_t * v1,vertex
 				return;
 			}
 		}
-		else if (pfront == NULL || pfront == pback)
+		else
 		{
-			return;
+			FPortal *pfront = fs->portals[sector_t::ceiling];
+			FPortal *pback = bs->portals[sector_t::ceiling];
+			if (pfront == NULL || fs->PortalBlocksView(sector_t::ceiling)) return;
+			if (pfront == pback && !bs->PortalBlocksView(sector_t::ceiling)) return;
 		}
 
 		// stacked sectors
@@ -378,8 +381,6 @@ void GLWall::SkyBottom(seg_t * seg,sector_t * fs,sector_t * bs,vertex_t * v1,ver
 	}
 	else 
 	{
-		FPortal *pfront = fs->portals[sector_t::floor];
-		FPortal *pback = bs->portals[sector_t::floor];
 		float frontreflect = fs->GetReflect(sector_t::floor);
 		if (frontreflect > 0)
 		{
@@ -390,9 +391,12 @@ void GLWall::SkyBottom(seg_t * seg,sector_t * fs,sector_t * bs,vertex_t * v1,ver
 				return;
 			}
 		}
-		else if (pfront == NULL || pfront == pback)
+		else
 		{
-			return;
+			FPortal *pfront = fs->portals[sector_t::floor];
+			FPortal *pback = bs->portals[sector_t::floor];
+			if (pfront == NULL || fs->PortalBlocksView(sector_t::floor)) return;
+			if (pfront == pback && !bs->PortalBlocksView(sector_t::floor)) return;
 		}
 
 		// stacked sectors

src/gl/scene/gl_walls.cpp

@@ -175,7 +175,7 @@ void GLWall::PutPortal(int ptype)
 		portal = GLPortal::FindPortal(skybox);
 		if (!portal)
 		{
-			// either a regulat skybox or an Eternity-style horizon
+			// either a regular skybox or an Eternity-style horizon
 			if (skybox->special1 != SKYBOX_MAP) portal = new GLEEHorizonPortal(skybox);
 			else portal = new GLSkyboxPortal(skybox);
 		}