diff --git a/engine/client/ref_common.c b/engine/client/ref_common.c
index 41fb6da6..bb3e72b5 100644
--- a/engine/client/ref_common.c
+++ b/engine/client/ref_common.c
@@ -558,7 +558,7 @@ static void SetWidthAndHeightFromCommandLine( void )
 		return;
 	}
 
-	R_SaveVideoMode( width, height );
+	R_SaveVideoMode( width, height, width, height );
 }
 
 static void SetFullscreenModeFromCommandLine( void )
diff --git a/engine/client/vid_common.c b/engine/client/vid_common.c
index a2a315a7..f31312dd 100644
--- a/engine/client/vid_common.c
+++ b/engine/client/vid_common.c
@@ -31,6 +31,10 @@ glwstate_t	glw_state;
 
 convar_t	*window_xpos;
 convar_t	*window_ypos;
+
+convar_t	*vid_rotate;
+convar_t	*vid_scale;
+
 /*
 =================
 VID_StartupGamma
@@ -62,19 +66,21 @@ void VID_InitDefaultResolution( void )
 R_SaveVideoMode
 =================
 */
-void R_SaveVideoMode( int w, int h )
+void R_SaveVideoMode( int w, int h , int render_w, int render_h )
 {
-	refState.width = w;
-	refState.height = h;
-
 	host.window_center_x = w / 2;
 	host.window_center_y = h / 2;
 
 	Cvar_SetValue( "width", w );
 	Cvar_SetValue( "height", h );
 
+	refState.width = render_w;
+	refState.height = render_h;
+
+	host.renderinfo_changed = false;
+
 	// check for 4:3 or 5:4
-	if( w * 3 != h * 4 && w * 4 != h * 5 )
+	if( render_w * 3 != render_h * 4 && render_w * 4 != render_h * 5 )
 		refState.wideScreen = true;
 	else refState.wideScreen = false;
 }
@@ -175,6 +181,8 @@ void VID_Init( void )
 	vid_displayfrequency = Cvar_Get ( "vid_displayfrequency", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "fullscreen refresh rate" );
 	vid_fullscreen = Cvar_Get( "fullscreen", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "enable fullscreen mode" );
 	vid_highdpi = Cvar_Get( "vid_highdpi", "1", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "enable High-DPI mode" );
+	vid_rotate = Cvar_Get( "vid_rotate", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "screen rotation (0-3)" );
+	vid_scale = Cvar_Get( "vid_scale", "1.0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "pixel scale" );
 
 	// a1ba: planned to be named vid_mode for compability
 	// but supported mode list is filled by backends, so numbers are not portable any more
diff --git a/engine/client/vid_common.h b/engine/client/vid_common.h
index 842ae2fc..f95d2531 100644
--- a/engine/client/vid_common.h
+++ b/engine/client/vid_common.h
@@ -34,8 +34,11 @@ extern glwstate_t glw_state;
 extern convar_t	*vid_fullscreen;
 extern convar_t	*vid_displayfrequency;
 extern convar_t	*vid_highdpi;
+extern convar_t	*vid_rotate;
+extern convar_t	*vid_scale;
+
 extern convar_t	*gl_wgl_msaa_samples;
-void R_SaveVideoMode( int w, int h );
+void R_SaveVideoMode( int w, int h, int render_w, int render_h );
 void VID_CheckChanges( void );
 const char *VID_GetModeString( int vid_mode );
 void VID_StartupGamma( void );
diff --git a/engine/platform/android/vid_android.c b/engine/platform/android/vid_android.c
index a447f5cb..6746f237 100644
--- a/engine/platform/android/vid_android.c
+++ b/engine/platform/android/vid_android.c
@@ -327,14 +327,34 @@ qboolean VID_SetMode( void )
 
 rserr_t   R_ChangeDisplaySettings( int width, int height, qboolean fullscreen )
 {
+	int render_w, render_h;
+	uint rotate = vid_rotate->value;
+
 	Android_GetScreenRes(&width, &height);
 
+	render_w = width, render_h = height;
+
 	Con_Reportf( "R_ChangeDisplaySettings: forced resolution to %dx%d)\n", width, height);
 
-	R_SaveVideoMode( width, height );
+	if( ref.dllFuncs.R_SetDisplayTransform( rotate, 0, 0, vid_scale->value, vid_scale->value ) )
+	{
+		if( rotate & 1 )
+		{
+			int swap = render_w;
+
+			render_w = render_h;
+			render_h = swap;
+		}
+
+		render_h /= vid_scale->value;
+		render_w /= vid_scale->value;
+	}
+	else
+	{
+		Con_Printf( S_WARN "failed to setup screen transform\n" );
+	}
 
-	host.window_center_x = width / 2;
-	host.window_center_y = height / 2;
+	R_SaveVideoMode( width, height, render_w, render_h );
 
 	refState.wideScreen = true; // V_AdjustFov will check for widescreen
 
diff --git a/engine/platform/linux/vid_fbdev.c b/engine/platform/linux/vid_fbdev.c
index 49e1f0cb..f9915db7 100644
--- a/engine/platform/linux/vid_fbdev.c
+++ b/engine/platform/linux/vid_fbdev.c
@@ -39,7 +39,7 @@ void GL_SwapBuffers( void )
 {
 }
 
-void FB_GetScreenRes(int *x, int *y)
+void FB_GetScreenRes( int *x, int *y )
 {
 	*x = fb.vinfo.xres;
 	*y = fb.vinfo.yres;
@@ -121,16 +121,32 @@ qboolean VID_SetMode( void )
 
 rserr_t   R_ChangeDisplaySettings( int width, int height, qboolean fullscreen )
 {
+	int render_w, render_h;
+	uint rotate = vid_rotate->value;
+
 	FB_GetScreenRes( &width, &height );
+	render_w = width, render_h = height;
 
-	Con_Reportf( "R_ChangeDisplaySettings: forced resolution to %dx%d)\n", width, height);
+	Con_Reportf( "R_ChangeDisplaySettings: forced resolution to %dx%d)\n", width, height );
 
-	R_SaveVideoMode( width, height );
+	if( ref.dllFuncs.R_SetDisplayTransform( rotate, 0, 0, vid_scale->value, vid_scale->value ) )
+	{
+		if( rotate & 1 )
+		{
+			int swap = render_w;
 
-	host.window_center_x = width / 2;
-	host.window_center_y = height / 2;
+			render_w = render_h;
+			render_h = swap;
+		}
 
-	refState.wideScreen = true; // V_AdjustFov will check for widescreen
+		render_h /= vid_scale->value;
+		render_w /= vid_scale->value;
+	}
+	else
+	{
+		Con_Printf( S_WARN "failed to setup screen transform\n" );
+	}
+	R_SaveVideoMode( width, height, render_w, render_h );
 
 	return rserr_ok;
 }
@@ -204,6 +220,13 @@ void SW_UnlockBuffer( void )
 
 qboolean SW_CreateBuffer( int width, int height, uint *stride, uint *bpp, uint *r, uint *g, uint *b )
 {
+	if( width > fb.vinfo.xres_virtual || height > fb.vinfo.yres_virtual )
+	{
+		Con_Printf( S_ERROR "requested size %dx%d not fit to framebuffer size %dx%d\n",
+					width, height, fb.vinfo.xres_virtual, fb.vinfo.yres_virtual );
+		return false;
+	}
+
 	*bpp = fb.vinfo.bits_per_pixel >> 3;
 	*stride = fb.vinfo.xres_virtual;
 	*r = FB_BF_TO_MASK(fb.vinfo.red);
diff --git a/engine/platform/sdl/events.c b/engine/platform/sdl/events.c
index 09e0a9d5..5da4341a 100644
--- a/engine/platform/sdl/events.c
+++ b/engine/platform/sdl/events.c
@@ -423,14 +423,11 @@ static void SDLash_EventFilter( SDL_Event *event )
 			VID_RestoreScreenResolution();
 			break;
 		case SDL_WINDOWEVENT_RESIZED:
-		case SDL_WINDOWEVENT_MAXIMIZED:
 		{
-			int w = VID_MIN_WIDTH, h = VID_MIN_HEIGHT;
 			if( vid_fullscreen->value )
 				break;
 
-			SDL_GL_GetDrawableSize( host.hWnd, &w, &h );
-			R_SaveVideoMode( w, h );
+			VID_SaveWindowSize( event->window.data1, event->window.data2 );
 			SCR_VidInit(); // tell the client.dll what vid_mode has changed
 			break;
 		}
diff --git a/engine/platform/sdl/events.h b/engine/platform/sdl/events.h
index d5102331..452f7286 100644
--- a/engine/platform/sdl/events.h
+++ b/engine/platform/sdl/events.h
@@ -28,7 +28,7 @@ void GL_InitExtensions( void );
 qboolean GL_CreateContext( void );
 qboolean GL_UpdateContext( void );
 qboolean GL_DeleteContext( void );
-
+void VID_SaveWindowSize( int width, int height );
 
 #endif // XASH_SDL
 #endif // KEYWRAPPER_H
diff --git a/engine/platform/sdl/vid_sdl.c b/engine/platform/sdl/vid_sdl.c
index cc97150c..7816a38e 100644
--- a/engine/platform/sdl/vid_sdl.c
+++ b/engine/platform/sdl/vid_sdl.c
@@ -449,7 +449,38 @@ qboolean GL_UpdateContext( void )
 	return true;
 }
 
-qboolean VID_SetScreenResolution( int width, int height )
+void VID_SaveWindowSize( int width, int height )
+{
+	int render_w = width, render_h = height;
+	uint rotate = vid_rotate->value;
+
+	if( !glw_state.software )
+		SDL_GL_GetDrawableSize( host.hWnd, &render_w, &render_h );
+	else
+		SDL_RenderSetLogicalSize( sw.renderer, width, height );
+
+	if( ref.dllFuncs.R_SetDisplayTransform( rotate, 0, 0, vid_scale->value, vid_scale->value ) )
+	{
+		if( rotate & 1 )
+		{
+			int swap = render_w;
+
+			render_w = render_h;
+			render_h = swap;
+		}
+
+		render_h /= vid_scale->value;
+		render_w /= vid_scale->value;
+	}
+	else
+	{
+		Con_Printf( S_WARN "failed to setup screen transform\n" );
+	}
+
+	R_SaveVideoMode( width, height, render_w, render_h );
+}
+
+static qboolean VID_SetScreenResolution( int width, int height )
 {
 	SDL_DisplayMode want, got;
 	Uint32 wndFlags = 0;
@@ -479,9 +510,8 @@ qboolean VID_SetScreenResolution( int width, int height )
 	SDL_SetWindowGrab( host.hWnd, SDL_TRUE );
 	SDL_SetWindowSize( host.hWnd, got.w, got.h );
 
-	SDL_GL_GetDrawableSize( host.hWnd, &got.w, &got.h );
+	VID_SaveWindowSize( got.w, got.h );
 
-	R_SaveVideoMode( got.w, got.h );
 	return true;
 }
 
@@ -672,9 +702,9 @@ qboolean VID_CreateWindow( int width, int height, qboolean fullscreen )
 		if( !GL_UpdateContext( ))
 		return false;
 
-		SDL_GL_GetDrawableSize( host.hWnd, &width, &height );
 	}
-	R_SaveVideoMode( width, height );
+
+	VID_SaveWindowSize( width, height );
 
 	return true;
 }
@@ -906,11 +936,7 @@ rserr_t R_ChangeDisplaySettings( int width, int height, qboolean fullscreen )
 #endif
 		SDL_SetWindowBordered( host.hWnd, SDL_TRUE );
 		SDL_SetWindowSize( host.hWnd, width, height );
-		if( !glw_state.software )
-			SDL_GL_GetDrawableSize( host.hWnd, &width, &height );
-		else
-			SDL_RenderSetLogicalSize(sw.renderer, width, height);
-		R_SaveVideoMode( width, height );
+		VID_SaveWindowSize( width, height );
 	}
 
 	return rserr_ok;
diff --git a/engine/ref_api.h b/engine/ref_api.h
index 9c4b546e..2566c2fb 100644
--- a/engine/ref_api.h
+++ b/engine/ref_api.h
@@ -88,6 +88,7 @@ typedef struct ref_globals_s
 	// viewport width and height
 	int      width;
 	int      height;
+
 	qboolean fullScreen;
 	qboolean wideScreen;
 
@@ -435,6 +436,7 @@ typedef struct ref_interface_s
 	// const char *(*R_GetInitError)( void );
 	void (*R_Shutdown)( void );
 	const char *(*R_GetConfigName)( void ); // returns config name without extension
+	qboolean (*R_SetDisplayTransform)( uint rotate, int x, int y, float scale_x, float scale_y );
 
 	// only called for GL contexts
 	void (*GL_SetupAttributes)( int safegl );
diff --git a/ref_gl/gl_context.c b/ref_gl/gl_context.c
index 35505a13..66d1eaec 100644
--- a/ref_gl/gl_context.c
+++ b/ref_gl/gl_context.c
@@ -308,6 +308,30 @@ void R_ProcessEntData( qboolean allocate )
 		gEngfuncs.drawFuncs->R_ProcessEntData( allocate );
 }
 
+qboolean R_SetDisplayTransform( uint rotate, int offset_x, int offset_y, float scale_x, float scale_y )
+{
+	qboolean ret = true;
+	if( rotate > 0 )
+	{
+		gEngfuncs.Con_Printf("rotation transform not supported\n");
+		ret = false;
+	}
+
+	if( offset_x || offset_y )
+	{
+		gEngfuncs.Con_Printf("offset transform not supported\n");
+		ret = false;
+	}
+
+	if( scale_x != 1.0f || scale_y != 1.0f )
+	{
+		gEngfuncs.Con_Printf("scale transform not supported\n");
+		ret = false;
+	}
+
+	return ret;
+}
+
 static const char *R_GetConfigName( void )
 {
 	return "opengl";
@@ -318,6 +342,7 @@ ref_interface_t gReffuncs =
 	R_Init,
 	R_Shutdown,
 	R_GetConfigName,
+	R_SetDisplayTransform,
 
 	GL_SetupAttributes,
 	GL_InitExtensions,