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sdl2: fix window_position config option

Closes: #724.

--- a/src/i_video.c

+++ b/src/i_video.c

@@ -977,24 +977,24 @@

     }

 }

-static void SetWindowPositionVars(void)

+static void GetWindowPosition(int *x, int *y)

 {

-    char buf[64];

-    int x, y;

+    // in windowed mode, the desired window position can be specified

+    // in the configuration file.

     if (window_position == NULL || !strcmp(window_position, ""))

     {

-        return;

+        *x = *y = SDL_WINDOWPOS_UNDEFINED;

     }

-

-    if (!strcmp(window_position, "center"))

+    else if (!strcmp(window_position, "center"))

     {

-        putenv("SDL_VIDEO_CENTERED=1");

+        *x = *y = SDL_WINDOWPOS_CENTERED;

     }

-    else if (sscanf(window_position, "%i,%i", &x, &y) == 2)

+    else if (sscanf(window_position, "%i,%i", x, y) != 2)

     {

-        M_snprintf(buf, sizeof(buf), "SDL_VIDEO_WINDOW_POS=%i,%i", x, y);

-        putenv(buf);

+        // invalid format: revert to default

+        fprintf(stderr, "GetWindowPosition: invalid window_position setting\n");

+        *x = *y = SDL_WINDOWPOS_UNDEFINED;

     }

 }

@@ -1002,6 +1002,7 @@

 {

     byte *doompal;

     int w, h;

+    int x, y;

     int flags = 0;

     doompal = W_CacheLumpName(DEH_String("PLAYPAL"), PU_CACHE);

@@ -1026,6 +1027,8 @@

     w = window_width;

     h = window_height;

+    GetWindowPosition(&x, &y);

+

     // In windowed mode, the window can be resized while the game is

     // running.

     flags = SDL_WINDOW_RESIZABLE;

@@ -1054,9 +1057,7 @@

     // later anyway and leave the window position "undefined". If "flags"

     // contains the fullscreen flag (see above), then w and h are ignored.

-    screen = SDL_CreateWindow(NULL,

-                              SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,

-                              w, h, flags);

+    screen = SDL_CreateWindow(NULL, x, y, w, h, flags);

     if (screen == NULL)

     {

@@ -1150,7 +1151,6 @@

     }

     SetSDLVideoDriver();

-    SetWindowPositionVars();

     if (SDL_Init(SDL_INIT_VIDEO) < 0) 

     {