Added a way to get the native Android window and EGL context

include/SDL_syswm.h

@@ -98,6 +98,11 @@ typedef struct _UIViewController UIViewController;
 #endif
 #endif
 
+#if defined(SDL_VIDEO_DRIVER_ANDROID)
+typedef struct ANativeWindow ANativeWindow;
+typedef void *EGLSurface;
+#endif
+
 /**
  *  These are the various supported windowing subsystems
  */
@@ -111,7 +116,8 @@ typedef enum
     SDL_SYSWM_UIKIT,
     SDL_SYSWM_WAYLAND,
     SDL_SYSWM_MIR,
-    SDL_SYSWM_WINRT
+    SDL_SYSWM_WINRT,
+    SDL_SYSWM_ANDROID
 } SDL_SYSWM_TYPE;
 
 /**
@@ -225,6 +231,14 @@ struct SDL_SysWMinfo
         } mir;
 #endif
 
+#if defined(SDL_VIDEO_DRIVER_ANDROID)
+        struct
+        {
+            ANativeWindow *window;
+            EGLSurface surface;
+        } android;
+#endif
+
         /* Can't have an empty union */
         int dummy;
     } info;

src/video/android/SDL_androidvideo.c

@@ -111,6 +111,7 @@ Android_CreateDevice(int devindex)
     device->CreateWindow = Android_CreateWindow;
     device->SetWindowTitle = Android_SetWindowTitle;
     device->DestroyWindow = Android_DestroyWindow;
+    device->GetWindowWMInfo = Android_GetWindowWMInfo;
 
     device->free = Android_DeleteDevice;
 

src/video/android/SDL_androidwindow.c

@@ -115,6 +115,24 @@ Android_DestroyWindow(_THIS, SDL_Window * window)
     }
 }
 
+SDL_bool
+Android_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info)
+{
+    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+
+    if (info->version.major == SDL_MAJOR_VERSION &&
+        info->version.minor == SDL_MINOR_VERSION) {
+        info->subsystem = SDL_SYSWM_ANDROID;
+        info->info.android.window = data->native_window;
+        info->info.android.surface = data->egl_surface;
+        return SDL_TRUE;
+    } else {
+        SDL_SetError("Application not compiled with SDL %d.%d\n",
+                     SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
+        return SDL_FALSE;
+    }
+}
+
 #endif /* SDL_VIDEO_DRIVER_ANDROID */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/video/android/SDL_androidwindow.h

@@ -29,6 +29,7 @@
 extern int Android_CreateWindow(_THIS, SDL_Window * window);
 extern void Android_SetWindowTitle(_THIS, SDL_Window * window);
 extern void Android_DestroyWindow(_THIS, SDL_Window * window);
+extern SDL_bool Android_GetWindowWMInfo(_THIS, SDL_Window * window, SDL_SysWMinfo * info);
 
 typedef struct
 {