sdl: added SDL.Input.EnableOppositeDirectional option. allows/disallows simultaneous right+left / up+down

changelog.txt

@@ -1,5 +1,5 @@
 
-
+08-Aug-2012 - prg - sdl: added SDL.Input.EnableOppositeDirectional option.  allows/disallows simultaneous right+left / up+down.
 25-Jul-2012 - AnS - Taseditor: auto-starting Note editing when creating Marker by double-click
 19-Jul-2012 - AnS - Taseditor: Lua registermanual allows changing the "Run function" button caption; Markers are always restored when deploying Bookmarks
 01-Jul-2012 - AnS - new hotkey "Run Manual Lua function"

src/drivers/sdl/config.cpp

@@ -193,6 +193,9 @@ InitConfig()
 	// display input
 	config->addOption("inputdisplay", "SDL.InputDisplay", 0);
 
+	// enable / disable opposite directionals (left + right or up + down simultaneously)
+	config->addOption("opposite-directionals", "SDL.Input.EnableOppositeDirectionals", 1);
+    
 	// pause movie playback at frame x
 	config->addOption("pauseframe", "SDL.PauseFrame", 0);
 	config->addOption("recordhud", "SDL.RecordHUD", 1);

src/drivers/sdl/input.cpp

@@ -1127,14 +1127,31 @@ UpdateGamepad (void)
 
 	rapid ^= 1;
 
+	int opposite_dirs;
+	g_config->getOption("SDL.Input.EnableOppositeDirectionals", &opposite_dirs);
+
 	// go through each of the four game pads
 	for (wg = 0; wg < 4; wg++)
 	{
-		// the 4 directional buttons, start, select, a, b
+		bool left = false;
+		bool up = false;
+		// a, b, select, start, up, down, left, right
 		for (x = 0; x < 8; x++)
 		{
 			if (DTestButton (&GamePadConfig[wg][x]))
 			{
+				if(opposite_dirs == 0)
+				{
+					// test for left+right and up+down
+					if(x == 4)
+						up = true;
+					if((x == 5) && (up == true))
+						continue;
+					if(x == 6)
+						left = true;
+					if((x == 7) && (left == true))
+						continue;
+				}
 				JS |= (1 << x) << (wg << 3);
 			}
 		}