--- src/osd/sdl/drawsdl.c	2009-01-02 19:49:02.000000000 +0100
+++ src/osd/sdl/drawsdl.c	2009-03-09 17:45:11.000000000 +0100
@@ -631,11 +631,15 @@
 	{
 		sdlwindow_blit_surface_size(window, window->width, window->height);
 	}
+	else if (window->nativeres)
+	{
+		sdlwindow_blit_surface_size(window, window->minwidth, window->minheight);
+	}
 	else
 	{
 		sdlwindow_blit_surface_size(window, window->monitor->center_width, window->monitor->center_height);
 	}
-	if (!sdl->scale_mode->is_scale)
+	if (!sdl->scale_mode->is_scale || (window->nativeres && window->fullscreen))
 		render_target_set_bounds(window->target, window->blitwidth, window->blitheight, sdlvideo_monitor_get_aspect(window->monitor));
 	else
 		render_target_set_bounds(window->target, sdl->hw_scale_width, sdl->hw_scale_height, 0);
--- src/osd/sdl/osdsdl.h	2009-01-22 04:19:59.000000000 +0100
+++ src/osd/sdl/osdsdl.h	2009-03-09 17:45:11.000000000 +0100
@@ -254,6 +254,7 @@
 #define SDLOPTION_CENTERH				"centerh"
 #define SDLOPTION_CENTERV				"centerv"
 #define SDLOPTION_PRESCALE				"prescale"
+#define SDLOPTION_NATIVERES				"nativeres"
 
 /* FIXME: seems to be donge for a long time */
 #define SDLOPTION_PRESCALE_EFFECT		"prescale_effect"
--- src/osd/sdl/sdlmain.c	2009-01-02 19:49:02.000000000 +0100
+++ src/osd/sdl/sdlmain.c	2009-03-09 17:45:11.000000000 +0100
@@ -96,6 +96,7 @@
 	{ NULL,                                   NULL,       OPTION_HEADER,     "PERFORMANCE OPTIONS" },
 	{ SDLOPTION_MULTITHREADING ";mt",         "0",        OPTION_BOOLEAN,    "enable multithreading; this enables rendering and blitting on a separate thread" },
 	{ SDLOPTION_SDLVIDEOFPS,                  "0",        OPTION_BOOLEAN,    "show sdl video performance" },
+	{ SDLOPTION_NATIVERES ";nr",              "0",        OPTION_BOOLEAN,    "UNOFFICIAL: enable native game resolutions in fullscreen mode (-video soft only)" },
 
 	// video options
 	{ NULL,                                   NULL,       OPTION_HEADER,     "VIDEO OPTIONS" },
--- src/osd/sdl/window.c	2009-02-16 06:35:41.000000000 +0100
+++ src/osd/sdl/window.c	2009-03-09 17:45:11.000000000 +0100
@@ -792,6 +792,9 @@
 	// FIXME: Does not belong here
 	window->startmaximized = options_get_bool(mame_options(), SDLOPTION_MAXIMIZE);
 
+	// determine desire for native game resolution
+	window->nativeres = options_get_bool(mame_options(), SDLOPTION_NATIVERES);
+
 	if (!window->fullscreen)
 	{
 		window->windowed_width = config->width;
--- src/osd/sdl/window.h	2009-02-16 06:35:34.000000000 +0100
+++ src/osd/sdl/window.h	2009-03-09 17:45:11.000000000 +0100
@@ -66,6 +66,7 @@
 	int					windowed_width;
 	int					windowed_height;
 	int					startmaximized;
+	int					nativeres;
 
 	// rendering info
 	osd_event *			rendered_event;