- Improve letterboxing in fullscreen by taking into account animorphic ratio settings.

- Added more resolutions to the hard coded table (up to 5K).
- Since we're using scaling for fullscreen, we should probably just use the hard coded table for fullscreen resolutions as well.
- Fixed: Resolution menu used fake aspect ratio to determine which aspect to file a resolution under.
- Added a way to use SDL surface blitting instead of accelerated textures.

src/sdl/i_input.cpp

@@ -18,6 +18,8 @@
 #include "templates.h"
 #include "s_sound.h"
 
+void ScaleWithAspect (int &w, int &h, int Width, int Height);
+
 static void I_CheckGUICapture ();
 static void I_CheckNativeMouse ();
 
@@ -318,6 +320,33 @@ void MessagePump (const SDL_Event &sev)
 			int x, y;
 			SDL_GetMouseState (&x, &y);
 
+			// Detect if we're doing scaling in the Window and adjust the mouse
+			// coordinates accordingly. This could be more efficent, but I
+			// don't think performance is an issue in the menus.
+			SDL_Window *focus;
+			if (screen->IsFullscreen() && (focus = SDL_GetMouseFocus ()))
+			{
+				int w, h;
+				SDL_GetWindowSize (focus, &w, &h);
+				int realw = w, realh = h;
+				ScaleWithAspect (realw, realh, SCREENWIDTH, SCREENHEIGHT);
+				if (realw != SCREENWIDTH || realh != SCREENHEIGHT)
+				{
+					double xratio = (double)SCREENWIDTH/realw;
+					double yratio = (double)SCREENHEIGHT/realh;
+					if (realw < w)
+					{
+						x = (x - (w - realw)/2)*xratio;
+						y *= yratio;
+					}
+					else
+					{
+						y = (y - (h - realh)/2)*yratio;
+						x *= xratio;
+					}
+				}
+			}
+
 			event.data1 = x;
 			event.data2 = y;
 			event.type = EV_GUI_Event;