- slightly improve sector portal handling in softpoly

src/polyrenderer/scene/poly_cull.cpp

@@ -28,7 +28,7 @@
 #include "poly_cull.h"
 #include "polyrenderer/poly_renderer.h"
 
-void PolyCull::CullScene(const PolyClipPlane &portalClipPlane)
+void PolyCull::CullScene(const PolyClipPlane &portalClipPlane, sector_t *portalEnter)
 {
 	ClearSolidSegments();
 	MarkViewFrustum();
@@ -49,6 +49,7 @@ void PolyCull::CullScene(const PolyClipPlane &portalClipPlane)
 	PvsLineVisible.resize(level.segs.Size());
 
 	PortalClipPlane = portalClipPlane;
+	PortalEnter = portalEnter;
 
 	// Cull front to back
 	FirstSkyHeight = true;
@@ -87,6 +88,14 @@ void PolyCull::CullNode(void *node)
 
 void PolyCull::CullSubsector(subsector_t *sub)
 {
+	// Ignore everything in front of the portal
+	if (PortalEnter)
+	{
+		if (sub->sector != PortalEnter)
+			return;
+		PortalEnter = nullptr;
+	}
+
 	// Check if subsector is clipped entirely by the portal clip plane
 	bool visible = false;
 	for (uint32_t i = 0; i < sub->numlines; i++)

src/polyrenderer/scene/poly_cull.h

@@ -29,7 +29,7 @@
 class PolyCull
 {
 public:
-	void CullScene(const PolyClipPlane &portalClipPlane);
+	void CullScene(const PolyClipPlane &portalClipPlane, sector_t *portalEnter);
 
 	bool IsLineSegVisible(uint32_t subsectorDepth, uint32_t lineIndex)
 	{
@@ -78,6 +78,7 @@ private:
 	bool FirstSkyHeight = true;
 
 	PolyClipPlane PortalClipPlane;
+	sector_t *PortalEnter = nullptr;
 
 	std::vector<uint32_t> PvsLineStart;
 	std::vector<bool> PvsLineVisible;

src/polyrenderer/scene/poly_portal.cpp

@@ -50,6 +50,7 @@ void PolyDrawSectorPortal::Render(int portalDepth)
 	PortalViewpoint.StencilValue = StencilValue;
 	PortalViewpoint.PortalPlane = PolyClipPlane(0.0f, 0.0f, 0.0f, 1.0f);
 	PortalViewpoint.PortalDepth = portalDepth;
+	PortalViewpoint.PortalEnterSector = Portal->mDestination;
 
 	PolyRenderer::Instance()->Scene.Render(&PortalViewpoint);
 	

src/polyrenderer/scene/poly_scene.cpp

@@ -59,7 +59,7 @@ void RenderPolyScene::Render(PolyPortalViewpoint *viewpoint)
 	CurrentViewpoint->LinePortalsStart = thread->LinePortals.size();
 
 	PolyCullCycles.Clock();
-	Cull.CullScene(CurrentViewpoint->PortalPlane);
+	Cull.CullScene(CurrentViewpoint->PortalPlane, CurrentViewpoint->PortalEnterSector);
 	PolyCullCycles.Unclock();
 
 	RenderSectors();

src/polyrenderer/scene/poly_scene.h

@@ -66,6 +66,7 @@ public:
 	bool Mirror = false;
 
 	line_t *PortalEnterLine = nullptr;
+	sector_t *PortalEnterSector = nullptr;
 
 	size_t ObjectsStart = 0;
 	size_t ObjectsEnd = 0;