diff --git a/src/gl/scene/gl_fakeflat.cpp b/src/gl/scene/gl_fakeflat.cpp
index 57da91f634..29f2f52a30 100644
--- a/src/gl/scene/gl_fakeflat.cpp
+++ b/src/gl/scene/gl_fakeflat.cpp
@@ -87,7 +87,7 @@ bool gl_CheckClip(side_t * sidedef, sector_t * frontsector, sector_t * backsecto
 	}
 	else
 	{
-		fs_ceilingheight2 = fs_ceilingheight1 = frontsector->ceilingplane.fixD();
+		fs_ceilingheight2 = fs_ceilingheight1 = frontsector->ceilingplane.fD();
 	}
 
 	if (frontsector->floorplane.isSlope())
@@ -97,7 +97,7 @@ bool gl_CheckClip(side_t * sidedef, sector_t * frontsector, sector_t * backsecto
 	}
 	else
 	{
-		fs_floorheight2 = fs_floorheight1 = -frontsector->floorplane.fixD();
+		fs_floorheight2 = fs_floorheight1 = -frontsector->floorplane.fD();
 	}
 
 	if (backsector->ceilingplane.isSlope())
@@ -107,7 +107,7 @@ bool gl_CheckClip(side_t * sidedef, sector_t * frontsector, sector_t * backsecto
 	}
 	else
 	{
-		bs_ceilingheight2 = bs_ceilingheight1 = backsector->ceilingplane.fixD();
+		bs_ceilingheight2 = bs_ceilingheight1 = backsector->ceilingplane.fD();
 	}
 
 	if (backsector->floorplane.isSlope())
@@ -117,7 +117,7 @@ bool gl_CheckClip(side_t * sidedef, sector_t * frontsector, sector_t * backsecto
 	}
 	else
 	{
-		bs_floorheight2 = bs_floorheight1 = -backsector->floorplane.fixD();
+		bs_floorheight2 = bs_floorheight1 = -backsector->floorplane.fD();
 	}
 
 	// now check for closed sectors!
diff --git a/src/gl/scene/gl_flats.cpp b/src/gl/scene/gl_flats.cpp
index 106d7adfb0..8e825ab5b9 100644
--- a/src/gl/scene/gl_flats.cpp
+++ b/src/gl/scene/gl_flats.cpp
@@ -78,31 +78,31 @@ static float tics;
 void gl_SetPlaneTextureRotation(const GLSectorPlane * secplane, FMaterial * gltexture)
 {
 	// only manipulate the texture matrix if needed.
-	if (secplane->xoffs != 0 || secplane->yoffs != 0 ||
-		secplane->xscale != FRACUNIT || secplane->yscale != FRACUNIT ||
-		secplane->angle != 0 || 
+	if (!secplane->Offs.isZero() ||
+		secplane->Scale.X != 1. || secplane->Scale.Y != 1 ||
+		secplane->Angle != 0 ||
 		gltexture->TextureWidth() != 64 ||
 		gltexture->TextureHeight() != 64)
 	{
-		float uoffs = FIXED2FLOAT(secplane->xoffs) / gltexture->TextureWidth();
-		float voffs = FIXED2FLOAT(secplane->yoffs) / gltexture->TextureHeight();
+		float uoffs = secplane->Offs.X / gltexture->TextureWidth();
+		float voffs = secplane->Offs.Y / gltexture->TextureHeight();
 
-		float xscale1=FIXED2FLOAT(secplane->xscale);
-		float yscale1=FIXED2FLOAT(secplane->yscale);
+		float xscale1 = secplane->Scale.X;
+		float yscale1 = secplane->Scale.Y;
 		if (gltexture->tex->bHasCanvas)
 		{
 			yscale1 = 0 - yscale1;
 		}
-		float angle=-AngleToFloat(secplane->angle);
+		float angle = -secplane->Angle;
 
-		float xscale2=64.f/gltexture->TextureWidth();
-		float yscale2=64.f/gltexture->TextureHeight();
+		float xscale2 = 64.f / gltexture->TextureWidth();
+		float yscale2 = 64.f / gltexture->TextureHeight();
 
 		gl_RenderState.mTextureMatrix.loadIdentity();
-		gl_RenderState.mTextureMatrix.scale(xscale1 ,yscale1,1.0f);
-		gl_RenderState.mTextureMatrix.translate(uoffs,voffs,0.0f);
-		gl_RenderState.mTextureMatrix.scale(xscale2 ,yscale2,1.0f);
-		gl_RenderState.mTextureMatrix.rotate(angle,0.0f,0.0f,1.0f);
+		gl_RenderState.mTextureMatrix.scale(xscale1, yscale1, 1.0f);
+		gl_RenderState.mTextureMatrix.translate(uoffs, voffs, 0.0f);
+		gl_RenderState.mTextureMatrix.scale(xscale2, yscale2, 1.0f);
+		gl_RenderState.mTextureMatrix.rotate(angle, 0.0f, 0.0f, 1.0f);
 		gl_RenderState.EnableTextureMatrix(true);
 	}
 }
diff --git a/src/gl/scene/gl_portal.cpp b/src/gl/scene/gl_portal.cpp
index 6b47266e83..bc57674ca6 100644
--- a/src/gl/scene/gl_portal.cpp
+++ b/src/gl/scene/gl_portal.cpp
@@ -1115,7 +1115,7 @@ void GLHorizonPortal::DrawContents()
 	gl_RenderState.SetCameraPos(FIXED2FLOAT(viewx), FIXED2FLOAT(viewy), FIXED2FLOAT(viewz));
 
 
-	z=FIXED2FLOAT(sp->texheight);
+	z=sp->Texheight;
 
 
 	if (gltexture && gltexture->tex->isFullbright())
@@ -1238,7 +1238,7 @@ void GLEEHorizonPortal::DrawContents()
 		horz.colormap = origin->Sector->ColorMap;
 		if (origin->special1 == SKYBOX_PLANE)
 		{
-			horz.plane.texheight = viewz + abs(horz.plane.texheight);
+			horz.plane.Texheight = FIXED2FLOAT(viewz) + fabs(horz.plane.Texheight);
 		}
 		GLHorizonPortal ceil(&horz, true);
 		ceil.DrawContents();
@@ -1251,7 +1251,7 @@ void GLEEHorizonPortal::DrawContents()
 		horz.colormap = origin->Sector->ColorMap;
 		if (origin->special1 == SKYBOX_PLANE)
 		{
-			horz.plane.texheight = viewz - abs(horz.plane.texheight);
+			horz.plane.Texheight = FIXED2FLOAT(viewz) - fabs(horz.plane.Texheight);
 		}
 		GLHorizonPortal floor(&horz, true);
 		floor.DrawContents();
diff --git a/src/gl/scene/gl_sky.cpp b/src/gl/scene/gl_sky.cpp
index 864a0d2816..c04b90129b 100644
--- a/src/gl/scene/gl_sky.cpp
+++ b/src/gl/scene/gl_sky.cpp
@@ -173,8 +173,8 @@ void GLWall::SkyPlane(sector_t *sector, int plane, bool allowreflect)
 		}
 		else if (allowreflect && sector->GetReflect(plane) > 0)
 		{
-			if ((plane == sector_t::ceiling && viewz > sector->ceilingplane.fixD()) ||
-				(plane == sector_t::floor && viewz < -sector->floorplane.fixD())) return;
+			if ((plane == sector_t::ceiling && FIXED2DBL(viewz) > sector->ceilingplane.fD()) ||
+				(plane == sector_t::floor && FIXED2DBL(viewz) < -sector->floorplane.fD())) return;
 			ptype = PORTALTYPE_PLANEMIRROR;
 			planemirror = plane == sector_t::ceiling ? &sector->ceilingplane : &sector->floorplane;
 		}
diff --git a/src/gl/scene/gl_wall.h b/src/gl/scene/gl_wall.h
index 91567ecb53..d71cccba54 100644
--- a/src/gl/scene/gl_wall.h
+++ b/src/gl/scene/gl_wall.h
@@ -72,21 +72,21 @@ struct GLSectorPlane
 {
 	FTextureID texture;
 	secplane_t plane;
-	fixed_t texheight;
-	fixed_t xoffs,  yoffs;
-	fixed_t	xscale, yscale;
-	angle_t	angle;
+	float Texheight;
+	float	Angle;
+	FVector2 Offs;
+	FVector2 Scale;
 
 	void GetFromSector(sector_t * sec, int ceiling)
 	{
-		xoffs = sec->GetXOffset(ceiling);
-		yoffs = sec->GetYOffset(ceiling);
-		xscale = sec->GetXScale(ceiling);
-		yscale = sec->GetYScale(ceiling);
-		angle = sec->GetAngle(ceiling);
+		Offs.X = (float)sec->GetXOffsetF(ceiling);
+		Offs.Y = (float)sec->GetYOffsetF(ceiling);
+		Scale.X = (float)sec->GetXScaleF(ceiling);
+		Scale.Y = (float)sec->GetYScaleF(ceiling);
+		Angle = (float)sec->GetAngleF(ceiling).Degrees;
 		texture = sec->GetTexture(ceiling);
 		plane = sec->GetSecPlane(ceiling);
-		texheight = (ceiling == sector_t::ceiling)? plane.fixD() : -plane.fixD();
+		Texheight = (float)((ceiling == sector_t::ceiling)? plane.fD() : -plane.fD());
 	}
 };
 
diff --git a/src/gl/scene/gl_walls.cpp b/src/gl/scene/gl_walls.cpp
index 4a560e107a..590e7734fd 100644
--- a/src/gl/scene/gl_walls.cpp
+++ b/src/gl/scene/gl_walls.cpp
@@ -1110,11 +1110,11 @@ __forceinline void GLWall::GetPlanePos(F3DFloor::planeref *planeref, fixed_t &le
 	}
 	else if(planeref->isceiling == sector_t::ceiling)
 	{
-		left = right = planeref->plane->fixD();
+		left = right = FLOAT2FIXED(planeref->plane->fD());
 	}
 	else
 	{
-		left = right = -planeref->plane->fixD();
+		left = right = -FLOAT2FIXED(planeref->plane->fD());
 	}
 }
 
@@ -1459,7 +1459,7 @@ void GLWall::Process(seg_t *seg, sector_t * frontsector, sector_t * backsector)
 	}
 	else
 	{
-		ffh1 = ffh2 = -segfront->floorplane.fixD();
+		ffh1 = ffh2 = -FLOAT2FIXED(segfront->floorplane.fD());
 		zfloor[0] = zfloor[1] = FIXED2FLOAT(ffh2);
 	}
 
@@ -1472,7 +1472,7 @@ void GLWall::Process(seg_t *seg, sector_t * frontsector, sector_t * backsector)
 	}
 	else
 	{
-		fch1 = fch2 = segfront->ceilingplane.fixD();
+		fch1 = fch2 = FLOAT2FIXED(segfront->ceilingplane.fD());
 		zceil[0] = zceil[1] = FIXED2FLOAT(fch2);
 	}
 
@@ -1527,7 +1527,7 @@ void GLWall::Process(seg_t *seg, sector_t * frontsector, sector_t * backsector)
 		}
 		else
 		{
-			bfh1 = bfh2 = -segback->floorplane.fixD();
+			bfh1 = bfh2 = -FLOAT2FIXED(segback->floorplane.fD());
 		}
 
 		if (segback->ceilingplane.isSlope())
@@ -1537,7 +1537,7 @@ void GLWall::Process(seg_t *seg, sector_t * frontsector, sector_t * backsector)
 		}
 		else
 		{
-			bch1 = bch2 = segback->ceilingplane.fixD();
+			bch1 = bch2 = FLOAT2FIXED(segback->ceilingplane.fD());
 		}
 
 		SkyTop(seg, frontsector, backsector, v1, v2);