diff --git a/src/gl/renderer/gl_colormap.h b/src/gl/renderer/gl_colormap.h
index 2122b1248..d66950309 100644
--- a/src/gl/renderer/gl_colormap.h
+++ b/src/gl/renderer/gl_colormap.h
@@ -75,5 +75,4 @@ struct FColormap
 };
 
 
-
 #endif
diff --git a/src/r_data/colormaps.cpp b/src/r_data/colormaps.cpp
index ffaaa38ac..3bfc89b4b 100644
--- a/src/r_data/colormaps.cpp
+++ b/src/r_data/colormaps.cpp
@@ -71,7 +71,7 @@ struct FakeCmap
 };
 
 TArray<FakeCmap> fakecmaps;
-FColormap realcolormaps;
+FSWColormap realcolormaps;
 size_t numfakecmaps;
 
 
diff --git a/src/r_data/colormaps.h b/src/r_data/colormaps.h
index bda6a5ea4..039a85189 100644
--- a/src/r_data/colormaps.h
+++ b/src/r_data/colormaps.h
@@ -9,10 +9,10 @@ void R_DeinitColormaps ();
 DWORD R_ColormapNumForName(const char *name);	// killough 4/4/98
 void R_SetDefaultColormap (const char *name);	// [RH] change normal fadetable
 DWORD R_BlendForColormap (DWORD map);			// [RH] return calculated blend for a colormap
-extern FColormap realcolormaps;					// [RH] make the colormaps externally visible
+extern FSWColormap realcolormaps;					// [RH] make the colormaps externally visible
 extern size_t numfakecmaps;
 
-struct FColormap
+struct FSWColormap
 {
 	BYTE *Maps = nullptr;
 	PalEntry Color = 0xffffffff;
@@ -20,7 +20,7 @@ struct FColormap
 	int Desaturate = 0;
 };
 
-struct FDynamicColormap : FColormap
+struct FDynamicColormap : FSWColormap
 {
 	void ChangeFade (PalEntry fadecolor);
 	void ChangeColor (PalEntry lightcolor, int desaturate);
@@ -47,7 +47,7 @@ enum
 };
 
 
-struct FSpecialColormap : FColormap
+struct FSpecialColormap : FSWColormap
 {
 	FSpecialColormap()
 	{
diff --git a/src/r_defs.h b/src/r_defs.h
index f4bfbcdcf..7d7ad7eab 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -1509,13 +1509,13 @@ struct FMiniBSP
 //
 
 typedef BYTE lighttable_t;	// This could be wider for >8 bit display.
-struct FColormap;
+struct FSWColormap;
 
 // This encapsulates the fields of vissprite_t that can be altered by AlterWeaponSprite
 struct visstyle_t
 {
 	int				ColormapNum;	// Which colormap is rendered
-	FColormap		*BaseColormap;	// Base colormap used together with ColormapNum
+	FSWColormap		*BaseColormap;	// Base colormap used together with ColormapNum
 	float			Alpha;
 	FRenderStyle	RenderStyle;
 };
diff --git a/src/r_draw.cpp b/src/r_draw.cpp
index 682ed4668..f255352f5 100644
--- a/src/r_draw.cpp
+++ b/src/r_draw.cpp
@@ -100,7 +100,7 @@ void (*R_DrawFogBoundary)(int x1, int x2, short *uclip, short *dclip);
 void (*R_MapTiltedPlane)(int y, int x1);
 void (*R_MapColoredPlane)(int y, int x1);
 void (*R_DrawParticle)(vissprite_t *);
-void (*R_SetupDrawSlab)(FColormap *base_colormap, float light, int shade);
+void (*R_SetupDrawSlab)(FSWColormap *base_colormap, float light, int shade);
 void (*R_DrawSlab)(int dx, fixed_t v, int dy, fixed_t vi, const BYTE *vptr, BYTE *p);
 fixed_t (*tmvline1_add)();
 void (*tmvline4_add)();
@@ -146,7 +146,7 @@ extern "C" {
 int				dc_pitch=0xABadCafe;	// [RH] Distance between rows
 
 lighttable_t*	dc_colormap; 
-FColormap		*dc_fcolormap;
+FSWColormap		*dc_fcolormap;
 ShadeConstants	dc_shade_constants;
 fixed_t			dc_light;
 int 			dc_x; 
@@ -1032,7 +1032,7 @@ int 					ds_y;
 int 					ds_x1;
 int 					ds_x2;
 
-FColormap*				ds_fcolormap;
+FSWColormap*				ds_fcolormap;
 lighttable_t*			ds_colormap;
 ShadeConstants			ds_shade_constants;
 dsfixed_t				ds_light;
@@ -2413,10 +2413,10 @@ void R_InitColumnDrawers ()
 		R_DrawParticle				= R_DrawParticle_C;
 
 #ifdef X86_ASM
-		R_SetupDrawSlab				= [](FColormap *colormap, float light, int shade) { R_SetupDrawSlabA(colormap->Maps + (GETPALOOKUP(light, shade) << COLORMAPSHIFT)); };
+		R_SetupDrawSlab				= [](FSWColormap *colormap, float light, int shade) { R_SetupDrawSlabA(colormap->Maps + (GETPALOOKUP(light, shade) << COLORMAPSHIFT)); };
 		R_DrawSlab					= R_DrawSlabA;
 #else
-		R_SetupDrawSlab				= [](FColormap *colormap, float light, int shade) { R_SetupDrawSlabC(colormap->Maps + (GETPALOOKUP(light, shade) << COLORMAPSHIFT)); };
+		R_SetupDrawSlab				= [](FSWColormap *colormap, float light, int shade) { R_SetupDrawSlabC(colormap->Maps + (GETPALOOKUP(light, shade) << COLORMAPSHIFT)); };
 		R_DrawSlab					= R_DrawSlabC;
 #endif
 
@@ -2806,7 +2806,7 @@ void R_SetTranslationMap(lighttable_t *translation)
 	}
 }
 
-void R_SetColorMapLight(FColormap *base_colormap, float light, int shade)
+void R_SetColorMapLight(FSWColormap *base_colormap, float light, int shade)
 {
 	dc_fcolormap = base_colormap;
 	if (r_swtruecolor)
@@ -2830,7 +2830,7 @@ void R_SetColorMapLight(FColormap *base_colormap, float light, int shade)
 	}
 }
 
-void R_SetDSColorMapLight(FColormap *base_colormap, float light, int shade)
+void R_SetDSColorMapLight(FSWColormap *base_colormap, float light, int shade)
 {
 	ds_fcolormap = base_colormap;
 	if (r_swtruecolor)
diff --git a/src/r_draw.h b/src/r_draw.h
index 591ae0b5f..204f2a493 100644
--- a/src/r_draw.h
+++ b/src/r_draw.h
@@ -31,7 +31,7 @@ extern "C" int 	fuzzoffset[FUZZTABLE + 1];	// [RH] +1 for the assembly routine
 extern "C" int 	fuzzpos;
 extern "C" int	fuzzviewheight;
 
-struct FColormap;
+struct FSWColormap;
 
 struct ShadeConstants
 {
@@ -52,7 +52,7 @@ extern "C" int			ylookup[MAXHEIGHT];
 extern "C" int			dc_pitch;		// [RH] Distance between rows
 
 extern "C" lighttable_t*dc_colormap;
-extern "C" FColormap	*dc_fcolormap;
+extern "C" FSWColormap	*dc_fcolormap;
 extern "C" ShadeConstants dc_shade_constants;
 extern "C" fixed_t		dc_light;
 extern "C" int			dc_x;
@@ -288,7 +288,7 @@ void	R_FillColumnP_C (void);
 void	R_FillColumnHorizP_C (void);
 void	R_FillSpan_C (void);
 
-extern void(*R_SetupDrawSlab)(FColormap *base_colormap, float light, int shade);
+extern void(*R_SetupDrawSlab)(FSWColormap *base_colormap, float light, int shade);
 extern void(*R_DrawSlab)(int dx, fixed_t v, int dy, fixed_t vi, const BYTE *vptr, BYTE *p);
 
 #ifdef X86_ASM
@@ -303,7 +303,7 @@ extern "C" int				ds_y;
 extern "C" int				ds_x1;
 extern "C" int				ds_x2;
 
-extern "C" FColormap*		ds_fcolormap;
+extern "C" FSWColormap*		ds_fcolormap;
 extern "C" lighttable_t*	ds_colormap;
 extern "C" ShadeConstants	ds_shade_constants;
 extern "C" dsfixed_t		ds_light;
@@ -374,10 +374,10 @@ void maskwallscan (int x1, int x2, short *uwal, short *dwal, float *swal, fixed_
 void transmaskwallscan (int x1, int x2, short *uwal, short *dwal, float *swal, fixed_t *lwal, double yrepeat, const BYTE *(*getcol)(FTexture *tex, int col)=R_GetColumn);
 
 // Sets dc_colormap and dc_light to their appropriate values depending on the output format (pal vs true color)
-void R_SetColorMapLight(FColormap *base_colormap, float light, int shade);
+void R_SetColorMapLight(FSWColormap *base_colormap, float light, int shade);
 
 // Same as R_SetColorMapLight, but for ds_colormap and ds_light
-void R_SetDSColorMapLight(FColormap *base_colormap, float light, int shade);
+void R_SetDSColorMapLight(FSWColormap *base_colormap, float light, int shade);
 
 void R_SetTranslationMap(lighttable_t *translation);
 
diff --git a/src/r_draw_rgba.cpp b/src/r_draw_rgba.cpp
index 69ebfeb84..0d86ead47 100644
--- a/src/r_draw_rgba.cpp
+++ b/src/r_draw_rgba.cpp
@@ -2751,7 +2751,7 @@ static ShadeConstants slab_rgba_shade_constants;
 static const BYTE *slab_rgba_colormap;
 static fixed_t slab_rgba_light;
 
-void R_SetupDrawSlab_rgba(FColormap *base_colormap, float light, int shade)
+void R_SetupDrawSlab_rgba(FSWColormap *base_colormap, float light, int shade)
 {
 	slab_rgba_shade_constants.light_red = base_colormap->Color.r * 256 / 255;
 	slab_rgba_shade_constants.light_green = base_colormap->Color.g * 256 / 255;
diff --git a/src/r_draw_rgba.h b/src/r_draw_rgba.h
index ca54f7263..df3d0f233 100644
--- a/src/r_draw_rgba.h
+++ b/src/r_draw_rgba.h
@@ -97,7 +97,7 @@ void R_FillSpan_rgba();
 void R_DrawTiltedSpan_rgba(int y, int x1, int x2, const FVector3 &plane_sz, const FVector3 &plane_su, const FVector3 &plane_sv, bool plane_shade, int planeshade, float planelightfloat, fixed_t pviewx, fixed_t pviewy);
 void R_DrawColoredSpan_rgba(int y, int x1, int x2);
 
-void R_SetupDrawSlab_rgba(FColormap *base_colormap, float light, int shade);
+void R_SetupDrawSlab_rgba(FSWColormap *base_colormap, float light, int shade);
 void R_DrawSlab_rgba(int dx, fixed_t v, int dy, fixed_t vi, const BYTE *vptr, BYTE *p);
 
 void R_DrawFogBoundary_rgba(int x1, int x2, short *uclip, short *dclip);
diff --git a/src/r_main.cpp b/src/r_main.cpp
index 5ff80b101..ba02a7c60 100644
--- a/src/r_main.cpp
+++ b/src/r_main.cpp
@@ -120,7 +120,7 @@ double			FocalLengthX;
 double			FocalLengthY;
 FDynamicColormap*basecolormap;		// [RH] colormap currently drawing with
 int				fixedlightlev;
-FColormap		*fixedcolormap;
+FSWColormap		*fixedcolormap;
 FSpecialColormap *realfixedcolormap;
 double			WallTMapScale2;
 
diff --git a/src/r_main.h b/src/r_main.h
index fa8fe0bb1..8d1867526 100644
--- a/src/r_main.h
+++ b/src/r_main.h
@@ -106,7 +106,7 @@ extern double			r_SpriteVisibility;
 extern int				r_actualextralight;
 extern bool				foggy;
 extern int				fixedlightlev;
-extern FColormap*		fixedcolormap;
+extern FSWColormap*		fixedcolormap;
 extern FSpecialColormap*realfixedcolormap;
 
 
diff --git a/src/r_swrenderer.cpp b/src/r_swrenderer.cpp
index 034275101..9bc8e4b96 100644
--- a/src/r_swrenderer.cpp
+++ b/src/r_swrenderer.cpp
@@ -340,7 +340,7 @@ void FSoftwareRenderer::RenderTextureView (FCanvasTexture *tex, AActor *viewpoin
 
 	// curse Doom's overuse of global variables in the renderer.
 	// These get clobbered by rendering to a camera texture but they need to be preserved so the final rendering can be done with the correct palette.
-	FColormap *savecolormap = fixedcolormap;
+	FSWColormap *savecolormap = fixedcolormap;
 	FSpecialColormap *savecm = realfixedcolormap;
 
 	DAngle savedfov = FieldOfView;
diff --git a/src/r_things.cpp b/src/r_things.cpp
index 013fc7152..6f1fb2700 100644
--- a/src/r_things.cpp
+++ b/src/r_things.cpp
@@ -1481,7 +1481,7 @@ void R_DrawPSprite(DPSprite *pspr, AActor *owner, float bobx, float boby, double
 		if (camera->Inventory != nullptr)
 		{
 			BYTE oldcolormapnum = vis->Style.ColormapNum;
-			FColormap *oldcolormap = vis->Style.BaseColormap;
+			FSWColormap *oldcolormap = vis->Style.BaseColormap;
 			camera->Inventory->AlterWeaponSprite (&vis->Style);
 			if (vis->Style.BaseColormap != oldcolormap || vis->Style.ColormapNum != oldcolormapnum)
 			{
@@ -1960,7 +1960,7 @@ void R_DrawSprite (vissprite_t *spr)
 	int r1, r2;
 	short topclip, botclip;
 	short *clip1, *clip2;
-	FColormap *colormap = spr->Style.BaseColormap;
+	FSWColormap *colormap = spr->Style.BaseColormap;
 	int colormapnum = spr->Style.ColormapNum;
 	F3DFloor *rover;
 	FDynamicColormap *mybasecolormap;
@@ -2486,7 +2486,7 @@ void R_ProjectParticle (particle_t *particle, const sector_t *sector, int shade,
 	int 				x1, x2, y1, y2;
 	vissprite_t*		vis;
 	sector_t*			heightsec = NULL;
-	FColormap*			map;
+	FSWColormap*			map;
 
 	// [ZZ] Particle not visible through the portal plane
 	if (CurrentPortal && !!P_PointOnLineSide(particle->Pos, CurrentPortal->dst))
@@ -2785,7 +2785,7 @@ extern double BaseYaspectMul;;
 void R_DrawVoxel(const FVector3 &globalpos, FAngle viewangle,
 	const FVector3 &dasprpos, DAngle dasprang,
 	fixed_t daxscale, fixed_t dayscale, FVoxel *voxobj,
-	FColormap *colormap, int colormapnum, short *daumost, short *dadmost, int minslabz, int maxslabz, int flags)
+	FSWColormap *colormap, int colormapnum, short *daumost, short *dadmost, int minslabz, int maxslabz, int flags)
 {
 	int i, j, k, x, y, syoff, ggxstart, ggystart, nxoff;
 	fixed_t cosang, sinang, sprcosang, sprsinang;
diff --git a/src/r_things.h b/src/r_things.h
index 13f89574b..cbe34015f 100644
--- a/src/r_things.h
+++ b/src/r_things.h
@@ -144,7 +144,7 @@ enum { DVF_OFFSCREEN = 1, DVF_SPANSONLY = 2, DVF_MIRRORED = 4 };
 void R_DrawVoxel(const FVector3 &viewpos, FAngle viewangle,
 	const FVector3 &sprpos, DAngle dasprang,
 	fixed_t daxscale, fixed_t dayscale, struct FVoxel *voxobj,
-	FColormap *colormap, int colormapnum, short *daumost, short *dadmost, int minslabz, int maxslabz, int flags);
+	FSWColormap *colormap, int colormapnum, short *daumost, short *dadmost, int minslabz, int maxslabz, int flags);
 
 void R_ClipVisSprite (vissprite_t *vis, int xl, int xh);
 
diff --git a/src/win32/win32gliface.cpp b/src/win32/win32gliface.cpp
index 7ca001e1e..59ef471d3 100644
--- a/src/win32/win32gliface.cpp
+++ b/src/win32/win32gliface.cpp
@@ -346,7 +346,8 @@ bool Win32GLVideo::GoFullscreen(bool yes)
 //
 //==========================================================================
 
-DFrameBuffer *Win32GLVideo::CreateFrameBuffer(int width, int height, bool fs, DFrameBuffer *old)
+
+DFrameBuffer *Win32GLVideo::CreateFrameBuffer(int width, int height, bool bgra, bool fs, DFrameBuffer *old)
 {
 	Win32GLFrameBuffer *fb;
 
@@ -860,7 +861,7 @@ IMPLEMENT_ABSTRACT_CLASS(Win32GLFrameBuffer)
 //
 //==========================================================================
 
-Win32GLFrameBuffer::Win32GLFrameBuffer(void *hMonitor, int width, int height, int bits, int refreshHz, bool fullscreen) : BaseWinFB(width, height) 
+Win32GLFrameBuffer::Win32GLFrameBuffer(void *hMonitor, int width, int height, int bits, int refreshHz, bool fullscreen) : BaseWinFB(width, height, false) 
 {
 	m_Width = width;
 	m_Height = height;
diff --git a/src/win32/win32gliface.h b/src/win32/win32gliface.h
index 6320e2903..87eb10de6 100644
--- a/src/win32/win32gliface.h
+++ b/src/win32/win32gliface.h
@@ -38,7 +38,7 @@ public:
 	void StartModeIterator (int bits, bool fs);
 	bool NextMode (int *width, int *height, bool *letterbox);
 	bool GoFullscreen(bool yes);
-	DFrameBuffer *CreateFrameBuffer (int width, int height, bool fs, DFrameBuffer *old);
+	DFrameBuffer *CreateFrameBuffer (int width, int height, bool bgra, bool fs, DFrameBuffer *old);
 	virtual bool SetResolution (int width, int height, int bits);
 	void DumpAdapters();
 	bool InitHardware (HWND Window, int multisample);