diff --git a/src/gl/data/gl_vertexbuffer.h b/src/gl/data/gl_vertexbuffer.h
index 5393e20685..2ecaff47b1 100644
--- a/src/gl/data/gl_vertexbuffer.h
+++ b/src/gl/data/gl_vertexbuffer.h
@@ -58,7 +58,6 @@ public:
 	FVertexBuffer(bool wantbuffer = true);
 	virtual ~FVertexBuffer();
 	virtual void BindVBO() = 0;
-	void EnableBufferArrays(int enable, int disable);
 };
 
 struct FSimpleVertex
diff --git a/src/gl/scene/gl_drawinfo.h b/src/gl/scene/gl_drawinfo.h
index 8bd4d4670a..6393ac660e 100644
--- a/src/gl/scene/gl_drawinfo.h
+++ b/src/gl/scene/gl_drawinfo.h
@@ -36,7 +36,6 @@ struct FDrawInfo : public HWDrawInfo
 
 	void AddWall(GLWall *wall) override;
     void AddMirrorSurface(GLWall *w) override;
-	void AddPortal(GLWall *w, int portaltype) override;
 	void AddFlat(GLFlat *flat, bool fog) override;
 	void AddSprite(GLSprite *sprite, bool translucent) override;
 
diff --git a/src/hwrenderer/scene/hw_drawinfo.h b/src/hwrenderer/scene/hw_drawinfo.h
index a490f55032..cb885202b3 100644
--- a/src/hwrenderer/scene/hw_drawinfo.h
+++ b/src/hwrenderer/scene/hw_drawinfo.h
@@ -329,7 +329,6 @@ public:
     virtual void AddSubsectorToPortal(FSectorPortalGroup *portal, subsector_t *sub) = 0;
     
     virtual void AddWall(GLWall *w) = 0;
-	virtual void AddPortal(GLWall *w, int portaltype) = 0;
     virtual void AddMirrorSurface(GLWall *w) = 0;
 	virtual void AddFlat(GLFlat *flat, bool fog) = 0;
 	virtual void AddSprite(GLSprite *sprite, bool translucent) = 0;
diff --git a/src/hwrenderer/scene/hw_portal.cpp b/src/hwrenderer/scene/hw_portal.cpp
index 0fa873737e..923d68eede 100644
--- a/src/hwrenderer/scene/hw_portal.cpp
+++ b/src/hwrenderer/scene/hw_portal.cpp
@@ -811,7 +811,7 @@ HWHorizonPortal::HWHorizonPortal(FPortalSceneState *s, GLHorizonInfo * pt, FRend
 
 	// Draw to some far away boundary
 	// This is not drawn as larger strips because it causes visual glitches.
-	auto verts = di->AllocVertices(256 + 10);
+	auto verts = di->AllocVertices(1024 + 10);
 	auto ptr = verts.first;
 	for (int xx = -32768; xx < 32768; xx += 4096)
 	{
@@ -855,7 +855,7 @@ HWHorizonPortal::HWHorizonPortal(FPortalSceneState *s, GLHorizonInfo * pt, FRend
 	ptr++;
 
 	voffset = verts.second;
-	vcount = 256;
+	vcount = 1024;
 
 }
 
@@ -905,7 +905,7 @@ void HWHorizonPortal::DrawContents(HWDrawInfo *di, FRenderState &state)
 
 	for (unsigned i = 0; i < vcount; i += 4)
 	{
-		di->Draw(DT_TriangleStrip, state, voffset + i, 4, i==0);
+		di->Draw(DT_TriangleStrip, state, voffset + i, 4, true);// i == 0);
 	}
 	di->Draw(DT_TriangleStrip, state, voffset + vcount, 10, false);
 
diff --git a/src/hwrenderer/scene/hw_skydome.cpp b/src/hwrenderer/scene/hw_skydome.cpp
index de8a51af1e..449be72f60 100644
--- a/src/hwrenderer/scene/hw_skydome.cpp
+++ b/src/hwrenderer/scene/hw_skydome.cpp
@@ -81,11 +81,13 @@ EXTERN_CVAR(Float, skyoffset)
 
 FSkyDomeCreator::FSkyDomeCreator()
 {
+	screen->mSkyData = this;
 	CreateDome();
 }
 
 FSkyDomeCreator::~FSkyDomeCreator()
 {
+	if (screen && screen->mSkyData) screen->mSkyData = nullptr;
 }
 
 //-----------------------------------------------------------------------------
diff --git a/src/hwrenderer/scene/hw_walls.cpp b/src/hwrenderer/scene/hw_walls.cpp
index 8c69394117..2c65db7ff2 100644
--- a/src/hwrenderer/scene/hw_walls.cpp
+++ b/src/hwrenderer/scene/hw_walls.cpp
@@ -39,6 +39,7 @@
 #include "hwrenderer/scene/hw_drawstructs.h"
 #include "hwrenderer/scene/hw_portal.h"
 #include "hw_renderstate.h"
+#include "hw_skydome.h"
 
 //==========================================================================
 //
@@ -470,7 +471,7 @@ void GLWall::PutPortal(HWDrawInfo *di, int ptype)
 		break;
 
 	case PORTALTYPE_SECTORSTACK:
-		portal = di->FindPortal(portal);
+		portal = di->FindPortal(this->portal);
 		if (!portal)
 		{
 			portal = new HWScenePortal(pstate, new HWSectorStackPortal(this->portal));
@@ -529,7 +530,7 @@ void GLWall::PutPortal(HWDrawInfo *di, int ptype)
 		portal = di->FindPortal(sky);
 		if (!portal)
 		{
-			portal = new HWSkyPortal(GLRenderer->mSkyVBO, &pstate, sky);
+			portal = new HWSkyPortal(screen->mSkyData, pstate, sky);
 			di->Portals.Push(portal);
 		}
 		portal->AddLine(this);
diff --git a/src/v_video.h b/src/v_video.h
index 6b81e73153..7e583a92a5 100644
--- a/src/v_video.h
+++ b/src/v_video.h
@@ -49,6 +49,7 @@ struct sector_t;
 class IShaderProgram;
 class FTexture;
 struct FPortalSceneState;
+class FSkyDomeCreator;
 
 enum EHWCaps
 {
@@ -368,6 +369,7 @@ public:
 	int stencilValue = 0;				// Global stencil test value
 	bool enable_quadbuffered = false;
 	FPortalSceneState *mPortalState;	// global portal state.
+	FSkyDomeCreator *mSkyData;			// we need access to this in the device independent part, but cannot depend on how the renderer manages it internally.
 
 	IntRect mScreenViewport;
 	IntRect mSceneViewport;