diff --git a/src/gl/scene/gl_drawinfo.cpp b/src/gl/scene/gl_drawinfo.cpp
index 73619e924e..4daed793a0 100644
--- a/src/gl/scene/gl_drawinfo.cpp
+++ b/src/gl/scene/gl_drawinfo.cpp
@@ -462,8 +462,8 @@ void GLDrawList::SortWallIntoWall(SortNode * head,SortNode * sort)
 		w->ztop[0]=ws->ztop[1]=izt;
 		w->zbottom[0]=ws->zbottom[1]=izb;
 		w->tcs[GLWall::LOLFT].u = w->tcs[GLWall::UPLFT].u = ws->tcs[GLWall::LORGT].u = ws->tcs[GLWall::UPRGT].u = iu;
-		ws->MakeVertices(false);
-		w->MakeVertices(false);
+		ws->MakeVertices(gl_drawinfo, false);
+		w->MakeVertices(gl_drawinfo, false);
 
 		SortNode * sort2=SortNodes.GetNew();
 		memset(sort2,0,sizeof(SortNode));
@@ -1317,3 +1317,9 @@ void FDrawInfo::AddSubsectorToPortal(FSectorPortalGroup *portal, subsector_t *su
 	portal->GetRenderState()->AddSubsector(sub);
 }
 
+std::pair<FFlatVertex *, unsigned int> FDrawInfo::AllocVertices(unsigned int count)
+{
+	unsigned int index = -1;
+	auto p = GLRenderer->mVBO->Alloc(count, &index);
+	return std::make_pair(p, index);
+}
diff --git a/src/gl/scene/gl_drawinfo.h b/src/gl/scene/gl_drawinfo.h
index 06bdbafcc2..e08441374c 100644
--- a/src/gl/scene/gl_drawinfo.h
+++ b/src/gl/scene/gl_drawinfo.h
@@ -180,6 +180,7 @@ struct FDrawInfo : public HWDrawInfo
 	void AddWall(GLWall *wall) override;
     void AddMirrorSurface(GLWall *w) override;
     void ProcessActorsInPortal(FLinePortalSpan *glport) override;
+	std::pair<FFlatVertex *, unsigned int> AllocVertices(unsigned int count) override;
 
 	// Legacy GL only. 
 	bool PutWallCompat(GLWall *wall, int passflag);
diff --git a/src/gl/scene/gl_vertex.cpp b/src/gl/scene/gl_vertex.cpp
index d0e59aa3ed..ca476982b1 100644
--- a/src/gl/scene/gl_vertex.cpp
+++ b/src/gl/scene/gl_vertex.cpp
@@ -23,6 +23,7 @@
 
 #include "r_defs.h"
 #include "hwrenderer/data/flatvertices.h"
+#include "hwrenderer/scene/hw_drawinfo.h"
 #include "gl/scene/gl_wall.h"
 
 EXTERN_CVAR(Bool, gl_seamless)
@@ -233,4 +234,24 @@ int GLWall::CountVertices()
 		}
 	}
 	return cnt;
-}
\ No newline at end of file
+}
+
+//==========================================================================
+//
+// build the vertices for this wall
+//
+//==========================================================================
+
+void GLWall::MakeVertices(HWDrawInfo *di, bool nosplit)
+{
+	if (vertcount == 0)
+	{
+		bool split = (gl_seamless && !nosplit && seg->sidedef != nullptr && !(seg->sidedef->Flags & WALLF_POLYOBJ) && !(flags & GLWF_NOSPLIT));
+		vertcount = split ? CountVertices() : 4;
+
+		auto ret = di->AllocVertices(vertcount);
+		vertindex = ret.second;
+		CreateVertices(ret.first, split);
+	}
+}
+
diff --git a/src/gl/scene/gl_wall.h b/src/gl/scene/gl_wall.h
index f948896155..f11d9588c1 100644
--- a/src/gl/scene/gl_wall.h
+++ b/src/gl/scene/gl_wall.h
@@ -211,12 +211,13 @@ private:
 	void SplitWall(HWDrawInfo *di, sector_t * frontsector, bool translucent);
 
 	bool SetupLights(FDynLightData &lightdata);
-	void MakeVertices(bool nosplit);
 	void RenderWall(int textured);
 	void RenderTextured(int rflags);
 
 	void FloodPlane(int pass);
 
+	void MakeVertices(HWDrawInfo *di, bool nosplit);
+
 	void SkyPlane(HWDrawInfo *di, sector_t *sector, int plane, bool allowmirror);
 	void SkyLine(HWDrawInfo *di, sector_t *sec, line_t *line);
 	void SkyNormal(HWDrawInfo *di, sector_t * fs,vertex_t * v1,vertex_t * v2);
diff --git a/src/gl/scene/gl_walls.cpp b/src/gl/scene/gl_walls.cpp
index 35351d4543..b1dbc8271a 100644
--- a/src/gl/scene/gl_walls.cpp
+++ b/src/gl/scene/gl_walls.cpp
@@ -50,7 +50,7 @@ void FDrawInfo::AddWall(GLWall *wall)
 	if (translucent) // translucent walls
 	{
 		wall->ViewDistance = (r_viewpoint.Pos - (wall->seg->linedef->v1->fPos() + wall->seg->linedef->Delta() / 2)).XY().LengthSquared();
-		wall->MakeVertices(true);
+		wall->MakeVertices(this, true);
 		auto newwall = drawlists[GLDL_TRANSLUCENT].NewWall();
 		*newwall = *wall;
 	}
@@ -73,7 +73,7 @@ void FDrawInfo::AddWall(GLWall *wall)
 		{
 			list = masked ? GLDL_MASKEDWALLS : GLDL_PLAINWALLS;
 		}
-		wall->MakeVertices(false);
+		wall->MakeVertices(this, false);
 		auto newwall = drawlists[list].NewWall();
 		*newwall = *wall;
 	}
@@ -133,7 +133,7 @@ void GLWall::PutPortal(HWDrawInfo *di, int ptype)
 {
 	GLPortal * portal;
 
-	MakeVertices(false);
+	MakeVertices(di, false);
 	switch (ptype)
 	{
 	// portals don't go into the draw list.
diff --git a/src/gl/scene/gl_walls_draw.cpp b/src/gl/scene/gl_walls_draw.cpp
index 9ace4fdcf3..5517df36f4 100644
--- a/src/gl/scene/gl_walls_draw.cpp
+++ b/src/gl/scene/gl_walls_draw.cpp
@@ -144,25 +144,6 @@ bool GLWall::SetupLights(FDynLightData &lightdata)
 	return true;
 }
 
-//==========================================================================
-//
-// build the vertices for this wall
-//
-//==========================================================================
-
-void GLWall::MakeVertices(bool nosplit)
-{
-	if (vertcount == 0)
-	{
-		bool split = (gl_seamless && !nosplit && seg->sidedef != nullptr && !(seg->sidedef->Flags & WALLF_POLYOBJ) && !(flags & GLWF_NOSPLIT));
-		vertcount = split ? CountVertices() : 4;
-
-		FFlatVertex *ptr = GLRenderer->mVBO->Alloc(vertcount, &vertindex);
-		CreateVertices(ptr, split);
-	}
-}
-
-
 //==========================================================================
 //
 // General purpose wall rendering function
diff --git a/src/hwrenderer/scene/hw_drawinfo.h b/src/hwrenderer/scene/hw_drawinfo.h
index 6d54769024..071bc5f31c 100644
--- a/src/hwrenderer/scene/hw_drawinfo.h
+++ b/src/hwrenderer/scene/hw_drawinfo.h
@@ -3,6 +3,8 @@
 #include "r_defs.h"
 
 struct FSectorPortalGroup;
+struct FLinePortalSpan;
+struct FFlatVertex;
 class GLWall;
 
 //==========================================================================
@@ -125,6 +127,7 @@ public:
     virtual void AddWall(GLWall *w) = 0;
     virtual void AddMirrorSurface(GLWall *w) = 0;
     virtual void ProcessActorsInPortal(FLinePortalSpan *glport) = 0;
+	virtual std::pair<FFlatVertex *, unsigned int> AllocVertices(unsigned int count) = 0;
 
 
 };