Merge pull request #3146 from Starbuck5/system-compat-sdl3

SDL3 support for pygame.system

Author: ankith26

src_c/meson.build

@@ -321,8 +321,6 @@ newbuffer = py.extension_module(
 )
 
 # new/experimental/uncommon stuff, but built by default
-# TODO: support SDL3
-if sdl_api != 3
 system = py.extension_module(
     'system',
     'system.c',
@@ -331,7 +329,6 @@ system = py.extension_module(
     install: true,
     subdir: pg,
 )
-endif
 
 geometry = py.extension_module(
     'geometry',

src_c/system.c

@@ -96,25 +96,53 @@ pg_system_get_pref_locales(PyObject *self, PyObject *_null)
         return NULL;
     }
 
-#if SDL_VERSION_ATLEAST(2, 0, 14)
+    // Sorry about the SDL3 gnarliness here, this was the best way I could
+    // think of to support SDL2/SDL3 at once. The approach is that each
+    // version is responsible for coming up with a list and a count,
+    // then the iteration over the list is shared (except for the indexing
+    // strategy, where SDL2/3 are different)
+
     PyObject *dict, *val = NULL;
+    int num_locales;
+    SDL_Locale *current_locale;
+
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+    SDL_Locale **locales = SDL_GetPreferredLocales(&num_locales);
+    if (!locales) {
+        /* Return an empty list if SDL function does not return any useful
+         * information */
+        return ret_list;
+    }
+#elif SDL_VERSION_ATLEAST(2, 0, 14)
     SDL_Locale *locales = SDL_GetPreferredLocales();
     if (!locales) {
         /* Return an empty list if SDL function does not return any useful
          * information */
         return ret_list;
     }
 
-    SDL_Locale *current_locale = locales;
-
+    num_locales = 0;
+    current_locale = locales;
     /* The array is terminated when the language attribute of the last struct
      * in the array is NULL */
     while (current_locale->language) {
+        num_locales++;
+        current_locale++;
+    }
+#endif
+
+#if SDL_VERSION_ATLEAST(2, 0, 14)
+    for (int i = 0; i < num_locales; i++) {
         dict = PyDict_New();
         if (!dict) {
             goto error;
         }
 
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+        current_locale = locales[i];
+#else
+        current_locale = locales + i;
+#endif
         val = PyUnicode_FromString(current_locale->language);
         if (!val) {
             goto error;
@@ -145,7 +173,6 @@ pg_system_get_pref_locales(PyObject *self, PyObject *_null)
             goto error;
         }
         Py_DECREF(dict);
-        current_locale++;
     }
 
     SDL_free(locales);