Fix resolution configuration on SDL2

sc2/src/libs/graphics/gfx_common.h

@@ -69,6 +69,7 @@ void TFB_UninitGraphics (void);
 void TFB_ProcessEvents (void);
 void TFB_SetGamma (float gamma);
 void TFB_UploadTransitionScreen (void);
+int TFB_SupportsHardwareScaling (void);
 // This function should not be called directly
 void TFB_SwapBuffers (int force_full_redraw);
 

sc2/src/libs/graphics/sdl/sdl1_common.c

@@ -209,4 +209,14 @@ TFB_SetColors (SDL_Surface *surface, SDL_Color *colors, int firstcolor, int ncol
 	return SDL_SetColors (surface, colors, firstcolor, ncolors);
 }
 
+int
+TFB_SupportsHardwareScaling (void)
+{
+#ifdef HAVE_OPENGL
+	return 1;
+#else
+	return 0;
+#endif
+}
+
 #endif

sc2/src/libs/graphics/sdl/sdl2_common.c

@@ -203,4 +203,9 @@ TFB_SetColors (SDL_Surface *surface, SDL_Color *colors, int firstcolor, int ncol
 	return 0;
 }
 
+int
+TFB_SupportsHardwareScaling (void)
+{
+	return 1;
+}
 #endif

sc2/src/libs/graphics/sdl/sdl2_pure.c

@@ -218,6 +218,9 @@ TFB_Pure_ConfigureVideo (int driver, int flags, int width, int height, int toggl
 		graphics_backend = &sdl2_unscaled_backend;
 	}
 
+	/* We succeeded, so alter the screen size to our new sizes */
+	ScreenWidthActual = width;
+	ScreenHeightActual = height;
 	/* TODO: Set bilinear vs nearest-neighbor filtering based on
 	 *       GfxFlags & TFB_GFXFLAGS_SCALE_ANY */
 	return 0;

sc2/src/uqm/setupmenu.c

@@ -66,12 +66,6 @@ static void rename_template (WIDGET_TEXTENTRY *self);
 static void rebind_control (WIDGET_CONTROLENTRY *widget);
 static void clear_control (WIDGET_CONTROLENTRY *widget);
 
-#ifdef HAVE_OPENGL
-#define RES_OPTS 4
-#else
-#define RES_OPTS 2
-#endif
-
 #define MENU_COUNT          8
 #define CHOICE_COUNT       22
 #define SLIDER_COUNT        3
@@ -190,6 +184,19 @@ static WIDGET **menu_widgets[MENU_COUNT] = {
 	main_widgets, graphics_widgets, audio_widgets, engine_widgets, 
 	incomplete_widgets, keyconfig_widgets, advanced_widgets, editkeys_widgets };
 
+static int
+number_res_options (void)
+{
+	if (TFB_SupportsHardwareScaling ())
+	{
+		return 4;
+	}
+	else
+	{
+		return 2;
+	}
+}
+
 static int
 quit_main_menu (WIDGET *self, int event)
 {
@@ -359,11 +366,11 @@ SetDefaults (void)
 	GetGlobalOptions (&opts);
 	if (opts.res == OPTVAL_CUSTOM)
 	{
-		choices[0].numopts = RES_OPTS + 1;
+		choices[0].numopts = number_res_options () + 1;
 	}
 	else
 	{
-		choices[0].numopts = RES_OPTS;
+		choices[0].numopts = number_res_options ();
 	}
 	choices[0].selected = opts.res;
 	choices[1].selected = opts.driver;
@@ -728,7 +735,7 @@ init_widgets (void)
 	}
 
 	/* The first choice is resolution, and is handled specially */
-	choices[0].numopts = RES_OPTS;
+	choices[0].numopts = number_res_options ();
 
 	/* Choices 18-20 are also special, being the names of the key configurations */
 	for (i = 0; i < 6; i++)