diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 40f11a9fe..7320f22f6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -821,7 +821,6 @@ set( FASTMATH_SOURCES
 	textures/hires/xbr/xbrz.cpp
 	textures/hires/xbr/xbrz_old.cpp
 	gl/scene/gl_drawinfo.cpp
-	gl/scene/gl_flats.cpp
 	gl/scene/gl_sprite.cpp
 	gl/scene/gl_skydome.cpp
 	gl/scene/gl_weapon.cpp
diff --git a/src/gl/scene/gl_drawinfo.cpp b/src/gl/scene/gl_drawinfo.cpp
index 8f56f4a89..1a1735e4d 100644
--- a/src/gl/scene/gl_drawinfo.cpp
+++ b/src/gl/scene/gl_drawinfo.cpp
@@ -273,6 +273,12 @@ bool FDrawInfo::SetDepthClamp(bool on)
 	return gl_RenderState.SetDepthClamp(on);
 }
 
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
 static int dt2gl[] = { GL_POINTS, GL_LINES, GL_TRIANGLES, GL_TRIANGLE_FAN, GL_TRIANGLE_STRIP };
 
 void FDrawInfo::Draw(EDrawType dt, FRenderState &state, int index, int count, bool apply)
@@ -303,3 +309,45 @@ void FDrawInfo::DrawIndexed(EDrawType dt, FRenderState &state, int index, int co
 
 
 
+//==========================================================================
+//
+// FDrawInfo::AddFlat
+//
+// Checks texture, lighting and translucency settings and puts this
+// plane in the appropriate render list.
+//
+//==========================================================================
+
+void FDrawInfo::AddFlat(GLFlat *flat, bool fog)
+{
+	int list;
+
+	if (flat->renderstyle != STYLE_Translucent || flat->alpha < 1.f - FLT_EPSILON || fog || flat->gltexture == nullptr)
+	{
+		// translucent 3D floors go into the regular translucent list, translucent portals go into the translucent border list.
+		list = (flat->renderflags&SSRF_RENDER3DPLANES) ? GLDL_TRANSLUCENT : GLDL_TRANSLUCENTBORDER;
+	}
+	else if (flat->gltexture->tex->GetTranslucency())
+	{
+		if (flat->stack)
+		{
+			list = GLDL_TRANSLUCENTBORDER;
+		}
+		else if ((flat->renderflags&SSRF_RENDER3DPLANES) && !flat->plane.plane.isSlope())
+		{
+			list = GLDL_TRANSLUCENT;
+		}
+		else
+		{
+			list = GLDL_PLAINFLATS;
+		}
+	}
+	else
+	{
+		bool masked = flat->gltexture->isMasked() && ((flat->renderflags&SSRF_RENDER3DPLANES) || flat->stack);
+		list = masked ? GLDL_MASKEDFLATS : GLDL_PLAINFLATS;
+	}
+	auto newflat = drawlists[list].NewFlat();
+	*newflat = *flat;
+}
+
diff --git a/src/gl/scene/gl_flats.cpp b/src/gl/scene/gl_flats.cpp
deleted file mode 100644
index 464d19ac3..000000000
--- a/src/gl/scene/gl_flats.cpp
+++ /dev/null
@@ -1,91 +0,0 @@
-// 
-//---------------------------------------------------------------------------
-//
-// Copyright(C) 2000-2016 Christoph Oelckers
-// All rights reserved.
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with this program.  If not, see http://www.gnu.org/licenses/
-//
-//--------------------------------------------------------------------------
-//
-/*
-** gl_flat.cpp
-** Flat rendering
-**
-*/
-
-#include "gl_load/gl_system.h"
-#include "a_sharedglobal.h"
-#include "r_defs.h"
-#include "r_sky.h"
-#include "r_utility.h"
-#include "doomstat.h"
-#include "d_player.h"
-#include "g_levellocals.h"
-#include "actorinlines.h"
-#include "p_lnspec.h"
-#include "hwrenderer/dynlights/hw_dynlightdata.h"
-
-#include "gl_load/gl_interface.h"
-#include "hwrenderer/utility/hw_cvars.h"
-#include "gl/renderer/gl_renderer.h"
-#include "gl/renderer/gl_lightdata.h"
-#include "gl/renderer/gl_renderstate.h"
-#include "gl/data/gl_vertexbuffer.h"
-#include "gl/dynlights/gl_lightbuffer.h"
-#include "gl/scene/gl_drawinfo.h"
-
-
-//==========================================================================
-//
-// FDrawInfo::AddFlat
-//
-// Checks texture, lighting and translucency settings and puts this
-// plane in the appropriate render list.
-//
-//==========================================================================
-
-void FDrawInfo::AddFlat(GLFlat *flat, bool fog)
-{
-	int list;
-
-	if (flat->renderstyle != STYLE_Translucent || flat->alpha < 1.f - FLT_EPSILON || fog || flat->gltexture == nullptr)
-	{
-		// translucent 3D floors go into the regular translucent list, translucent portals go into the translucent border list.
-		list = (flat->renderflags&SSRF_RENDER3DPLANES) ? GLDL_TRANSLUCENT : GLDL_TRANSLUCENTBORDER;
-	}
-	else if (flat->gltexture->tex->GetTranslucency())
-	{
-		if (flat->stack)
-		{
-			list = GLDL_TRANSLUCENTBORDER;
-		}
-		else if ((flat->renderflags&SSRF_RENDER3DPLANES) && !flat->plane.plane.isSlope())
-		{
-			list = GLDL_TRANSLUCENT;
-		}
-		else
-		{
-			list = GLDL_PLAINFLATS;
-		}
-	}
-	else
-	{
-		bool masked = flat->gltexture->isMasked() && ((flat->renderflags&SSRF_RENDER3DPLANES) || flat->stack);
-		list = masked ? GLDL_MASKEDFLATS : GLDL_PLAINFLATS;
-	}
-	auto newflat = drawlists[list].NewFlat();
-	*newflat = *flat;
-}
-