Add 'centered' and 'undefined' pos options to sdl_window:create/6

1 files changed, 26 insertions, 2 deletions

diff --git a/c_src/sdl_window.c b/c_src/sdl_window.c
index 49fa005..0983370 100644
--- a/c_src/sdl_window.c
+++ b/c_src/sdl_window.c
@@ -63,12 +63,36 @@ NIF_CALL_HANDLER(thread_create_window)
 NIF_FUNCTION(create_window)
 {
 	char* title = (char*)enif_alloc(255);
+	char buf[MAX_ATOM_LENGTH];
 	int x, y, w, h;
 	Uint32 flags = 0;
 
 	BADARG_IF(!enif_get_string(env, argv[0], title, 255, ERL_NIF_LATIN1));
-	BADARG_IF(!enif_get_int(env, argv[1], &x));
-	BADARG_IF(!enif_get_int(env, argv[2], &y));
+
+	if (enif_is_atom(env, argv[1])) {
+		BADARG_IF(!enif_get_atom(env, argv[1], buf, MAX_ATOM_LENGTH, ERL_NIF_LATIN1));
+
+		if (!strcmp(buf, "centered"))
+			x = SDL_WINDOWPOS_CENTERED;
+		else if (!strcmp(buf, "undefined"))
+			x = SDL_WINDOWPOS_UNDEFINED;
+		else
+			return enif_make_badarg(env);
+	} else
+		BADARG_IF(!enif_get_int(env, argv[1], &x));
+
+	if (enif_is_atom(env, argv[2])) {
+		BADARG_IF(!enif_get_atom(env, argv[2], buf, MAX_ATOM_LENGTH, ERL_NIF_LATIN1));
+
+		if (!strcmp(buf, "centered"))
+			y = SDL_WINDOWPOS_CENTERED;
+		else if (!strcmp(buf, "undefined"))
+			y = SDL_WINDOWPOS_UNDEFINED;
+		else
+			return enif_make_badarg(env);
+	} else
+		BADARG_IF(!enif_get_int(env, argv[2], &y));
+
 	BADARG_IF(!enif_get_int(env, argv[3], &w));
 	BADARG_IF(!enif_get_int(env, argv[4], &h));
 	BADARG_IF(!list_to_window_flags(env, argv[5], &flags));