Change draw segment list to use TArray

src/swrenderer/line/r_line.cpp

@@ -318,8 +318,6 @@ namespace swrenderer
 			I_FatalError("Bad R_StoreWallRange: %i to %i", start, stop);
 #endif
 
-		DrawSegment *draw_segment = DrawSegmentList::Instance()->Add();
-
 		if (!rw_prepped)
 		{
 			rw_prepped = true;
@@ -331,6 +329,9 @@ namespace swrenderer
 		
 		RenderPortal *renderportal = RenderPortal::Instance();
 
+		DrawSegment *draw_segment = RenderMemory::NewObject<DrawSegment>();
+		DrawSegmentList::Instance()->Push(draw_segment);
+
 		draw_segment->CurrentPortalUniq = renderportal->CurrentPortalUniq;
 		draw_segment->sx1 = WallC.sx1;
 		draw_segment->sx2 = WallC.sx2;
@@ -516,8 +517,7 @@ namespace swrenderer
 
 					if (draw_segment->bFogBoundary || draw_segment->maskedtexturecol != nullptr)
 					{
-						size_t drawsegnum = draw_segment - DrawSegmentList::Instance()->drawsegs;
-						DrawSegmentList::Instance()->InterestingDrawsegs.Push(drawsegnum);
+						DrawSegmentList::Instance()->PushInteresting(draw_segment);
 					}
 				}
 		}

src/swrenderer/scene/r_portal.cpp

@@ -104,8 +104,6 @@ namespace swrenderer
 		int savedextralight = extralight;
 		DVector3 savedpos = ViewPos;
 		DAngle savedangle = ViewAngle;
-		ptrdiff_t savedds_p = drawseglist->ds_p - drawseglist->drawsegs;
-		size_t savedinteresting = drawseglist->FirstInterestingDrawseg;
 		double savedvisibility = LightVisibility::Instance()->GetVisibility();
 		AActor *savedcamera = camera;
 		sector_t *savedsector = viewsector;
@@ -188,7 +186,7 @@ namespace swrenderer
 			}
 
 			// Create a drawseg to clip sprites to the sky plane
-			DrawSegment *draw_segment = drawseglist->Add();
+			DrawSegment *draw_segment = RenderMemory::NewObject<DrawSegment>();
 			draw_segment->CurrentPortalUniq = CurrentPortalUniq;
 			draw_segment->siz1 = INT_MAX;
 			draw_segment->siz2 = INT_MAX;
@@ -207,13 +205,9 @@ namespace swrenderer
 			draw_segment->foggy = false;
 			memcpy(draw_segment->sprbottomclip, floorclip + pl->left, (pl->right - pl->left) * sizeof(short));
 			memcpy(draw_segment->sprtopclip, ceilingclip + pl->left, (pl->right - pl->left) * sizeof(short));
+			drawseglist->Push(draw_segment);
 
-			drawseglist->firstdrawseg = draw_segment;
-			drawseglist->FirstInterestingDrawseg = drawseglist->InterestingDrawsegs.Size();
-
-			interestingStack.Push(drawseglist->FirstInterestingDrawseg);
-			ptrdiff_t diffnum = drawseglist->firstdrawseg - drawseglist->drawsegs;
-			drawsegStack.Push(diffnum);
+			drawseglist->PushPortal();
 			VisibleSpriteList::Instance()->PushPortal();
 			viewposStack.Push(ViewPos);
 			visplaneStack.Push(pl);
@@ -229,33 +223,23 @@ namespace swrenderer
 		// Draw all the masked textures in a second pass, in the reverse order they
 		// were added. This must be done separately from the previous step for the
 		// sake of nested skyboxes.
-		while (interestingStack.Pop(drawseglist->FirstInterestingDrawseg))
+		while (viewposStack.Size() > 0)
 		{
-			ptrdiff_t pd = 0;
-
-			drawsegStack.Pop(pd);
-			drawseglist->firstdrawseg = drawseglist->drawsegs + pd;
-
 			// Masked textures and planes need the view coordinates restored for proper positioning.
 			viewposStack.Pop(ViewPos);
 
 			RenderTranslucentPass::Instance()->Render();
 
-			drawseglist->ds_p = drawseglist->firstdrawseg;
-
-			VisibleSpriteList::Instance()->PopPortal();
-
 			VisiblePlane *pl;
 			visplaneStack.Pop(pl);
 			if (pl->Alpha > 0 && pl->picnum != skyflatnum)
 			{
 				pl->Render(pl->Alpha, pl->Additive, true);
 			}
+
+			VisibleSpriteList::Instance()->PopPortal();
+			drawseglist->PopPortal();
 		}
-		drawseglist->firstdrawseg = drawseglist->drawsegs;
-		drawseglist->ds_p = drawseglist->drawsegs + savedds_p;
-		drawseglist->InterestingDrawsegs.Resize((unsigned int)drawseglist->FirstInterestingDrawseg);
-		drawseglist->FirstInterestingDrawseg = savedinteresting;
 
 		camera = savedcamera;
 		viewsector = savedsector;

src/swrenderer/scene/r_portal.h

@@ -55,8 +55,6 @@ namespace swrenderer
 		void RenderLinePortal(PortalDrawseg* pds, int depth);
 		void RenderLinePortalHighlight(PortalDrawseg* pds);
 		
-		TArray<size_t> interestingStack;
-		TArray<ptrdiff_t> drawsegStack;
 		TArray<DVector3> viewposStack;
 		TArray<VisiblePlane *> visplaneStack;
 		TArray<PortalDrawseg *> WallPortals;

src/swrenderer/scene/r_scene.cpp

@@ -248,7 +248,6 @@ namespace swrenderer
 	{
 		RenderTranslucentPass::Instance()->Deinit();
 		Clip3DFloors::Instance()->Cleanup();
-		DrawSegmentList::Instance()->Deinit();
 	}
 
 	/////////////////////////////////////////////////////////////////////////

src/swrenderer/scene/r_translucent_pass.cpp

@@ -72,8 +72,10 @@ namespace swrenderer
 		// b) skip most of the collected drawsegs which have no portal attached.
 		portaldrawsegs.Clear();
 		DrawSegmentList *drawseglist = DrawSegmentList::Instance();
-		for (DrawSegment* seg = drawseglist->ds_p; seg-- > drawseglist->firstdrawseg; )
+		for (auto index = drawseglist->BeginIndex(); index != drawseglist->EndIndex(); index++)
 		{
+			DrawSegment *seg = drawseglist->Segment(index);
+
 			// I don't know what makes this happen (some old top-down portal code or possibly skybox code? something adds null lines...)
 			// crashes at the first frame of the first map of Action2.wad
 			if (!seg->curline) continue;
@@ -141,9 +143,12 @@ namespace swrenderer
 		{
 			Clip3DFloors::Instance()->fake3D |= FAKE3D_REFRESHCLIP;
 		}
+
 		DrawSegmentList *drawseglist = DrawSegmentList::Instance();
-		for (DrawSegment *ds = drawseglist->ds_p; ds-- > drawseglist->firstdrawseg; )
+		for (auto index = drawseglist->BeginIndex(); index != drawseglist->EndIndex(); index++)
 		{
+			DrawSegment *ds = drawseglist->Segment(index);
+
 			// [ZZ] the same as above
 			if (ds->CurrentPortalUniq != renderportal->CurrentPortalUniq)
 				continue;

src/swrenderer/segments/r_drawsegment.cpp

@@ -49,40 +49,39 @@ namespace swrenderer
 		return &instance;
 	}
 
-	void DrawSegmentList::Deinit()
-	{
-		if (drawsegs != nullptr)
-		{
-			M_Free(drawsegs);
-			drawsegs = nullptr;
-		}
-	}
-
 	void DrawSegmentList::Clear()
 	{
-		if (drawsegs == nullptr)
-		{
-			MaxDrawSegs = 256; // [RH] Default. Increased as needed.
-			firstdrawseg = drawsegs = (DrawSegment *)M_Malloc (MaxDrawSegs * sizeof(DrawSegment));
-		}
-		FirstInterestingDrawseg = 0;
-		InterestingDrawsegs.Clear ();
-		ds_p = drawsegs;
+		Segments.Clear();
+		StartIndices.Clear();
+		StartIndices.Push(0);
+
+		InterestingSegments.Clear();
+		StartInterestingIndices.Clear();
+		StartInterestingIndices.Push(0);
 	}
 
-	DrawSegment *DrawSegmentList::Add()
+	void DrawSegmentList::PushPortal()
 	{
-		if (ds_p == &drawsegs[MaxDrawSegs])
-		{ // [RH] Grab some more drawsegs
-			size_t newdrawsegs = MaxDrawSegs ? MaxDrawSegs * 2 : 32;
-			ptrdiff_t firstofs = firstdrawseg - drawsegs;
-			drawsegs = (DrawSegment *)M_Realloc(drawsegs, newdrawsegs * sizeof(DrawSegment));
-			firstdrawseg = drawsegs + firstofs;
-			ds_p = drawsegs + MaxDrawSegs;
-			MaxDrawSegs = newdrawsegs;
-			DPrintf(DMSG_NOTIFY, "MaxDrawSegs increased to %zu\n", MaxDrawSegs);
+		StartIndices.Push(Segments.Size());
+		StartInterestingIndices.Push(InterestingSegments.Size());
 	}
 
-		return ds_p++;
+	void DrawSegmentList::PopPortal()
+	{
+		Segments.Resize(StartIndices.Last());
+		StartIndices.Pop();
+
+		StartInterestingIndices.Resize(StartInterestingIndices.Last());
+		StartInterestingIndices.Pop();
+	}
+
+	void DrawSegmentList::Push(DrawSegment *segment)
+	{
+		Segments.Push(segment);
+	}
+
+	void DrawSegmentList::PushInteresting(DrawSegment *segment)
+	{
+		InterestingSegments.Push(segment);
 	}
 }

src/swrenderer/segments/r_drawsegment.h

@@ -52,19 +52,25 @@ namespace swrenderer
 	public:
 		static DrawSegmentList *Instance();
 
-		DrawSegment *firstdrawseg = nullptr;
-		DrawSegment *ds_p = nullptr;
-		DrawSegment *drawsegs = nullptr;
+		unsigned int BeginIndex() const { return StartIndices.Last(); }
+		unsigned int EndIndex() const { return Segments.Size(); }
+		DrawSegment *Segment(int index) const { return Segments[Segments.Size() - 1 - index]; }
 
-		TArray<size_t> InterestingDrawsegs; // drawsegs that have something drawn on them
-		size_t FirstInterestingDrawseg = 0;
+		unsigned int BeginInterestingIndex() const { return StartInterestingIndices.Last(); }
+		unsigned int EndInterestingIndex() const { return InterestingSegments.Size(); }
+		DrawSegment *InterestingSegment(int index) const { return InterestingSegments[Segments.Size() - 1 - index]; }
 
 		void Clear();
-		void Deinit();
-
-		DrawSegment *Add();
+		void PushPortal();
+		void PopPortal();
+		void Push(DrawSegment *segment);
+		void PushInteresting(DrawSegment *segment);
 
 	private:
-		size_t MaxDrawSegs = 0;
+		TArray<DrawSegment *> Segments;
+		TArray<unsigned int> StartIndices;
+
+		TArray<DrawSegment *> InterestingSegments; // drawsegs that have something drawn on them
+		TArray<unsigned int> StartInterestingIndices;
 	};
 }

src/swrenderer/things/r_particle.cpp

@@ -266,9 +266,10 @@ namespace swrenderer
 		// Draw any masked textures behind this particle so that when the
 		// particle is drawn, it will be in front of them.
 		DrawSegmentList *segmentlist = DrawSegmentList::Instance();
-		for (unsigned int p = segmentlist->InterestingDrawsegs.Size(); p-- > segmentlist->FirstInterestingDrawseg; )
+		for (unsigned int index = segmentlist->BeginInterestingIndex(); index != segmentlist->EndInterestingIndex(); index++)
 		{
-			DrawSegment *ds = &segmentlist->drawsegs[segmentlist->InterestingDrawsegs[p]];
+			DrawSegment *ds = segmentlist->InterestingSegment(index);
+
 			// kg3D - no fake segs
 			if (ds->fake) continue;
 			if (ds->x1 >= x2 || ds->x2 <= x1)

src/swrenderer/things/r_visiblesprite.cpp

@@ -47,7 +47,6 @@ namespace swrenderer
 
 		VisibleSprite *spr = this;
 
-		DrawSegment *ds;
 		int i;
 		int x1, x2;
 		int r1, r2;
@@ -280,15 +279,11 @@ namespace swrenderer
 		// Scan drawsegs from end to start for obscuring segs.
 		// The first drawseg that is closer than the sprite is the clip seg.
 
-		// Modified by Lee Killough:
-		// (pointer check was originally nonportable
-		// and buggy, by going past LEFT end of array):
-
-		//		for (ds=ds_p-1 ; ds >= drawsegs ; ds--)    old buggy code
-
 		DrawSegmentList *segmentlist = DrawSegmentList::Instance();
-		for (ds = segmentlist->ds_p; ds-- > segmentlist->firstdrawseg; )  // new -- killough
+		for (unsigned int index = segmentlist->BeginIndex(); index != segmentlist->EndIndex(); index++)
 		{
+			DrawSegment *ds = segmentlist->Segment(index);
+
 			// [ZZ] portal handling here
 			//if (ds->CurrentPortalUniq != spr->CurrentPortalUniq)
 			//	continue;