Respond to mouse cursor positions but not relative motions when the w…

…indow is not focused, no more looking around when tabbed out.

Quake/in_sdl.c

@@ -32,6 +32,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #include "SDL.h"
 #endif
 
+static qboolean windowhasfocus = true;	//just in case sdl fails to tell us...
 static qboolean	textmode;
 extern qboolean	bind_grab;	//from the menu code, so that we regrab the mouse in order to pass inputs through
 
@@ -302,7 +303,7 @@ static void IN_UpdateGrabs_Internal(qboolean forecerelease)
 	qboolean needevents;	//whether we want to receive events still
 
 	qboolean gamecodecursor = (key_dest == key_game && cl.qcvm.cursorforced) || (key_dest == key_menu && cls.menu_qcvm.cursorforced);
-	wantcursor = (key_dest == key_console || (key_dest == key_menu&&!bind_grab)) || gamecodecursor;
+	wantcursor = (key_dest == key_console || (key_dest == key_menu&&!bind_grab)) || gamecodecursor || !windowhasfocus;
 	freemouse = wantcursor && (modestate == MS_WINDOWED || gamecodecursor);
 	needevents = (!wantcursor) || key_dest == key_game;
 
@@ -503,6 +504,8 @@ extern cvar_t cl_minpitch; /* johnfitz -- variable pitch clamping */
 
 void IN_MouseMotion(int dx, int dy, int wx, int wy)
 {
+	if (!windowhasfocus)
+		dx = dy = 0;	//don't change view angles etc while unfocused.
 	vid.cursorpos[0] = wx;
 	vid.cursorpos[1] = wy;
 	if (key_dest == key_menu && cls.menu_qcvm.extfuncs.Menu_InputEvent)
@@ -521,7 +524,7 @@ void IN_MouseMotion(int dx, int dy, int wx, int wy)
 			G_VECTORSET(OFS_PARM2, wy, 0, 0);	//y
 			G_VECTORSET(OFS_PARM3, 0, 0, 0);	//devid
 		}
-		else
+		else if (dx||dy)
 		{
 			G_FLOAT(OFS_PARM0) = CSIE_MOUSEDELTA;
 			G_VECTORSET(OFS_PARM1, dx, dy, 0);	//x
@@ -1171,9 +1174,9 @@ void IN_SendKeyEvents (void)
 #if defined(USE_SDL2)
 		case SDL_WINDOWEVENT:
 			if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED)
-				S_UnblockSound();
+				windowhasfocus=true, S_UnblockSound();
 			else if (event.window.event == SDL_WINDOWEVENT_FOCUS_LOST)
-				S_BlockSound();
+				windowhasfocus=false, S_BlockSound();
 			else if (event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)
 			{
 				vid.width = event.window.data1;
@@ -1186,8 +1189,9 @@ void IN_SendKeyEvents (void)
 			if (event.active.state & (SDL_APPINPUTFOCUS|SDL_APPACTIVE))
 			{
 				if (event.active.gain)
-					S_UnblockSound();
-				else	S_BlockSound();
+					windowhasfocus=true, S_UnblockSound();
+				else
+					windowhasfocus=false, S_BlockSound();
 			}
 			break;
 #endif