- fix translucent walls when r_models is enabled

src/swrenderer/line/r_line.cpp

@@ -346,6 +346,7 @@ namespace swrenderer
 		draw_segment->x2 = stop;
 		draw_segment->curline = mLineSegment;
 		draw_segment->foggy = foggy;
+		draw_segment->SubsectorDepth = Thread->OpaquePass->GetSubsectorDepth(mSubsector->Index());
 
 		bool markportal = ShouldMarkPortal();
 

src/swrenderer/scene/r_opaque_pass.cpp

@@ -497,6 +497,11 @@ namespace swrenderer
 		{
 			outersubsector = true;
 			InSubsector = sub;
+
+			// Mark the visual sorting depth of this subsector
+			uint32_t subsectorDepth = (uint32_t)PvsSubsectors.size();
+			SubsectorDepths[sub->Index()] = subsectorDepth;
+			PvsSubsectors.push_back(sub->Index());
 		}
 
 #ifdef RANGECHECK
@@ -837,6 +842,11 @@ namespace swrenderer
 		if (Thread->MainThread)
 			WallCycles.Clock();
 
+		for (uint32_t sub : PvsSubsectors)
+			SubsectorDepths[sub] = 0xffffffff;
+		SubsectorDepths.resize(level.subsectors.Size(), 0xffffffff);
+
+		PvsSubsectors.clear();
 		SeenSpriteSectors.clear();
 		SeenActors.clear();
 

src/swrenderer/scene/r_opaque_pass.h

@@ -71,6 +71,8 @@ namespace swrenderer
 		
 		void ClearSeenSprites() { SeenSpriteSectors.clear(); SeenActors.clear(); }
 
+		uint32_t GetSubsectorDepth(int index) const { return SubsectorDepths[index]; }
+
 		short floorclip[MAXWIDTH];
 		short ceilingclip[MAXWIDTH];
 
@@ -97,5 +99,7 @@ namespace swrenderer
 		SWRenderLine renderline;
 		std::set<sector_t*> SeenSpriteSectors;
 		std::set<AActor*> SeenActors;
+		std::vector<uint32_t> PvsSubsectors;
+		std::vector<uint32_t> SubsectorDepths;
 	};
 }

src/swrenderer/scene/r_translucent_pass.cpp

@@ -178,7 +178,7 @@ namespace swrenderer
 			MaskedCycles.Clock();
 
 		CollectPortals();
-		Thread->SpriteList->Sort();
+		Thread->SpriteList->Sort(Thread);
 		Thread->DrawSegments->BuildSegmentGroups();
 
 		Clip3DFloors *clip3d = Thread->Clip3D.get();

src/swrenderer/segments/r_drawsegment.h

@@ -53,6 +53,8 @@ namespace swrenderer
 		
 		int CurrentPortalUniq = 0; // [ZZ] to identify the portal that this drawseg is in. used for sprite clipping.
 
+		int SubsectorDepth;
+
 		bool Has3DFloorWalls() const { return b3DFloorBoundary != 0; }
 		bool Has3DFloorFrontSectorWalls() const { return (b3DFloorBoundary & 2) == 2; }
 		bool Has3DFloorBackSectorWalls() const { return (b3DFloorBoundary & 1) == 1; }

src/swrenderer/things/r_visiblesprite.cpp

@@ -53,6 +53,22 @@ namespace swrenderer
 	{
 		if (IsModel())
 		{
+			// Draw segments behind model
+			DrawSegmentList *segmentlist = thread->DrawSegments.get();
+			RenderPortal *renderportal = thread->Portal.get();
+			for (unsigned int index = 0; index != segmentlist->TranslucentSegmentsCount(); index++)
+			{
+				DrawSegment *ds = segmentlist->TranslucentSegment(index);
+				if (ds->SubsectorDepth >= SubsectorDepth && ds->CurrentPortalUniq == renderportal->CurrentPortalUniq)
+				{
+					int r1 = MAX<int>(ds->x1, 0);
+					int r2 = MIN<int>(ds->x2, viewwidth - 1);
+
+					RenderDrawSegment renderer(thread);
+					renderer.Render(ds, r1, r2, clip3DFloor);
+				}
+			}
+
 			Render(thread, nullptr, nullptr, 0, 0, clip3DFloor);
 			return;
 		}
@@ -299,6 +315,24 @@ namespace swrenderer
 		RenderPortal *renderportal = thread->Portal.get();
 
 		// Render draw segments behind sprite
+		if (r_models)
+		{
+			int subsectordepth = spr->SubsectorDepth;
+			for (unsigned int index = 0; index != segmentlist->TranslucentSegmentsCount(); index++)
+			{
+				DrawSegment *ds = segmentlist->TranslucentSegment(index);
+				if (ds->SubsectorDepth >= subsectordepth && ds->CurrentPortalUniq == renderportal->CurrentPortalUniq)
+				{
+					int r1 = MAX<int>(ds->x1, 0);
+					int r2 = MIN<int>(ds->x2, viewwidth - 1);
+
+					RenderDrawSegment renderer(thread);
+					renderer.Render(ds, r1, r2, clip3DFloor);
+				}
+			}
+		}
+		else
+		{
 			for (unsigned int index = 0; index != segmentlist->TranslucentSegmentsCount(); index++)
 			{
 				DrawSegment *ds = segmentlist->TranslucentSegment(index);
@@ -326,6 +360,7 @@ namespace swrenderer
 					}
 				}
 			}
+		}
 
 		for (unsigned int groupIndex = 0; groupIndex < segmentlist->SegmentGroups.Size(); groupIndex++)
 		{

src/swrenderer/things/r_visiblesprite.h

@@ -43,10 +43,9 @@ namespace swrenderer
 		bool IsCurrentPortalUniq(int portalUniq) const { return CurrentPortalUniq == portalUniq; }
 		const FVector3 &WorldPos() const { return gpos; }
 
-		double SortDist2D() const { return DVector2(deltax, deltay).LengthSquared(); }
 		float SortDist() const { return idepth; }
 
-		float DrawSegDepth() const { return depth; }
+		int SubsectorDepth;
 
 	protected:
 		virtual bool IsParticle() const { return false; }

src/swrenderer/things/r_visiblespritelist.cpp

@@ -59,7 +59,7 @@ namespace swrenderer
 		Sprites.Push(sprite);
 	}
 
-	void VisibleSpriteList::Sort()
+	void VisibleSpriteList::Sort(RenderThread *thread)
 	{
 		unsigned int first = StartIndices.Size() == 0 ? 0 : StartIndices.Last();
 		unsigned int count = Sprites.Size() - first;
@@ -83,9 +83,59 @@ namespace swrenderer
 				SortedSprites[i] = Sprites[first + count - i - 1];
 		}
 
+		if (r_models) // To do: only do this if models are spotted - just in case there's some lame renderhack somewhere that relies on Carmacks algorithm
+		{
+			for (unsigned int i = 0; i < count; i++)
+			{
+				FVector2 worldPos = SortedSprites[i]->WorldPos().XY();
+				SortedSprites[i]->SubsectorDepth = FindSubsectorDepth(thread, { worldPos.X, worldPos.Y });
+			}
+
+			std::stable_sort(&SortedSprites[0], &SortedSprites[count], [](VisibleSprite *a, VisibleSprite *b) -> bool
+			{
+				if (a->SubsectorDepth != b->SubsectorDepth)
+					return a->SubsectorDepth < b->SubsectorDepth;
+				else
+					return a->SortDist() > b->SortDist();
+			});
+		}
+		else
+		{
 			std::stable_sort(&SortedSprites[0], &SortedSprites[count], [](VisibleSprite *a, VisibleSprite *b) -> bool
 			{
 				return a->SortDist() > b->SortDist();
 			});
 		}
 	}
+
+	uint32_t VisibleSpriteList::FindSubsectorDepth(RenderThread *thread, const DVector2 &worldPos)
+	{
+		if (level.nodes.Size() == 0)
+		{
+			subsector_t *sub = &level.subsectors[0];
+			return thread->OpaquePass->GetSubsectorDepth(sub->Index());
+		}
+		else
+		{
+			return FindSubsectorDepth(thread, worldPos, level.HeadNode());
+		}
+	}
+
+	uint32_t VisibleSpriteList::FindSubsectorDepth(RenderThread *thread, const DVector2 &worldPos, void *node)
+	{
+		while (!((size_t)node & 1))  // Keep going until found a subsector
+		{
+			node_t *bsp = (node_t *)node;
+
+			DVector2 planePos(FIXED2DBL(bsp->x), FIXED2DBL(bsp->y));
+			DVector2 planeNormal = DVector2(FIXED2DBL(-bsp->dy), FIXED2DBL(bsp->dx));
+			double planeD = planeNormal | planePos;
+
+			int side = (worldPos | planeNormal) > planeD;
+			node = bsp->children[side];
+		}
+
+		subsector_t *sub = (subsector_t *)((uint8_t *)node - 1);
+		return thread->OpaquePass->GetSubsectorDepth(sub->Index());
+	}
+}

src/swrenderer/things/r_visiblespritelist.h

@@ -12,11 +12,14 @@ namespace swrenderer
 		void PushPortal();
 		void PopPortal();
 		void Push(VisibleSprite *sprite);
-		void Sort();
+		void Sort(RenderThread *thread);
 
 		TArray<VisibleSprite *> SortedSprites;
 
 	private:
+		uint32_t FindSubsectorDepth(RenderThread *thread, const DVector2 &worldPos);
+		uint32_t FindSubsectorDepth(RenderThread *thread, const DVector2 &worldPos, void *node);
+
 		TArray<VisibleSprite *> Sprites;
 		TArray<unsigned int> StartIndices;
 	};