From eaa15f2b74bdacc62937a7d0e0967686821eca0f Mon Sep 17 00:00:00 2001
From: Magnus Norddahl <dpjudas@users.noreply.github.com>
Date: Fri, 25 Nov 2016 20:19:35 +0100
Subject: [PATCH] Render other sector portal types

---
 src/r_poly_cull.cpp   |  6 ++++++
 src/r_poly_plane.cpp  |  2 ++
 src/r_poly_portal.cpp | 36 ++++++++++++++++++++++++++++--------
 3 files changed, 36 insertions(+), 8 deletions(-)

diff --git a/src/r_poly_cull.cpp b/src/r_poly_cull.cpp
index ff349690c0..04d5c3c244 100644
--- a/src/r_poly_cull.cpp
+++ b/src/r_poly_cull.cpp
@@ -85,6 +85,12 @@ void PolyCull::CullSubsector(subsector_t *sub)
 		seg_t *line = &sub->firstline[i];
 		if ((line->sidedef == nullptr || !(line->sidedef->Flags & WALLF_POLYOBJ)) && line->backsector == nullptr)
 		{
+			// Skip lines not facing viewer
+			DVector2 pt1 = line->v1->fPos() - ViewPos;
+			DVector2 pt2 = line->v2->fPos() - ViewPos;
+			if (pt1.Y * (pt1.X - pt2.X) + pt1.X * (pt2.Y - pt1.Y) >= 0)
+				continue;
+
 			int sx1, sx2;
 			if (GetSegmentRangeForLine(line->v1->fX(), line->v1->fY(), line->v2->fX(), line->v2->fY(), sx1, sx2))
 			{
diff --git a/src/r_poly_plane.cpp b/src/r_poly_plane.cpp
index 60b9d7569a..e64d085e78 100644
--- a/src/r_poly_plane.cpp
+++ b/src/r_poly_plane.cpp
@@ -150,6 +150,8 @@ void RenderPolyPlane::Render(const TriMatrix &worldToClip, subsector_t *sub, uin
 {
 	FSectorPortal *portal = sub->sector->ValidatePortal(ceiling ? sector_t::ceiling : sector_t::floor);
 	PolyDrawSectorPortal *polyportal = nullptr;
+	if (portal && (portal->mFlags & PORTSF_INSKYBOX) == PORTSF_INSKYBOX) // Do not recurse into portals we already recursed into
+		portal = nullptr;
 	if (portal)
 	{
 		for (auto &p : sectorPortals)
diff --git a/src/r_poly_portal.cpp b/src/r_poly_portal.cpp
index 0346a9d7db..d6a67a3175 100644
--- a/src/r_poly_portal.cpp
+++ b/src/r_poly_portal.cpp
@@ -271,7 +271,7 @@ PolyDrawSectorPortal::PolyDrawSectorPortal(FSectorPortal *portal, bool ceiling)
 
 void PolyDrawSectorPortal::Render(int portalDepth)
 {
-	if (Portal->mType != PORTS_SKYVIEWPOINT)
+	if (Portal->mType == PORTS_HORIZON || Portal->mType == PORTS_PLANE)
 		return;
 
 	SaveGlobals();
@@ -302,10 +302,14 @@ void PolyDrawSectorPortal::Render(int portalDepth)
 
 void PolyDrawSectorPortal::RenderTranslucent(int portalDepth)
 {
-	if (Portal->mType != PORTS_SKYVIEWPOINT)
+	if (Portal->mType == PORTS_HORIZON || Portal->mType == PORTS_PLANE)
 		return;
+
+	SaveGlobals();
 		
 	RenderPortal.RenderTranslucent(portalDepth);
+
+	RestoreGlobals();
 }
 
 void PolyDrawSectorPortal::SaveGlobals()
@@ -317,20 +321,36 @@ void PolyDrawSectorPortal::SaveGlobals()
 	savedcamera = camera;
 	savedsector = viewsector;
 
-	// Don't let gun flashes brighten the sky box
-	ASkyViewpoint *sky = barrier_cast<ASkyViewpoint*>(Portal->mSkybox);
-	extralight = 0;
-	R_SetVisibility(sky->args[0] * 0.25f);
-	ViewPos = sky->InterpolatedPosition(r_TicFracF);
-	ViewAngle = savedangle + (sky->PrevAngles.Yaw + deltaangle(sky->PrevAngles.Yaw, sky->Angles.Yaw) * r_TicFracF);
+	if (Portal->mType == PORTS_SKYVIEWPOINT)
+	{
+		// Don't let gun flashes brighten the sky box
+		ASkyViewpoint *sky = barrier_cast<ASkyViewpoint*>(Portal->mSkybox);
+		extralight = 0;
+		R_SetVisibility(sky->args[0] * 0.25f);
+		ViewPos = sky->InterpolatedPosition(r_TicFracF);
+		ViewAngle = savedangle + (sky->PrevAngles.Yaw + deltaangle(sky->PrevAngles.Yaw, sky->Angles.Yaw) * r_TicFracF);
+	}
+	else //if (Portal->mType == PORTS_STACKEDSECTORTHING || Portal->mType == PORTS_PORTAL || Portal->mType == PORTS_LINKEDPORTAL)
+	{
+		//extralight = pl->extralight;
+		//R_SetVisibility(pl->visibility);
+		ViewPos.X += Portal->mDisplacement.X;
+		ViewPos.Y += Portal->mDisplacement.Y;
+	}
 
 	camera = nullptr;
 	viewsector = Portal->mDestination;
 	R_SetViewAngle();
+
+	Portal->mFlags |= PORTSF_INSKYBOX;
+	if (Portal->mPartner > 0) sectorPortals[Portal->mPartner].mFlags |= PORTSF_INSKYBOX;
 }
 
 void PolyDrawSectorPortal::RestoreGlobals()
 {
+	Portal->mFlags &= ~PORTSF_INSKYBOX;
+	if (Portal->mPartner > 0) sectorPortals[Portal->mPartner].mFlags &= ~PORTSF_INSKYBOX;
+
 	camera = savedcamera;
 	viewsector = savedsector;
 	ViewPos = savedpos;