testgamecontroller: Add battery reporting

test/testgamecontroller.c

@@ -69,6 +69,17 @@ static const struct { int x; int y; double angle; } axis_positions[] = {
 };
 SDL_COMPILE_TIME_ASSERT(axis_positions, SDL_arraysize(axis_positions) == SDL_CONTROLLER_AXIS_MAX);
 
+/* This is indexed by SDL_JoystickPowerLevel + 1. */
+static const char* power_level_strings[] = {
+    "unknown", /* SDL_JOYSTICK_POWER_UNKNOWN */
+    "empty",   /* SDL_JOYSTICK_POWER_EMPTY */
+    "low",     /* SDL_JOYSTICK_POWER_LOW */
+    "medium",  /* SDL_JOYSTICK_POWER_MEDIUM */
+    "full",    /* SDL_JOYSTICK_POWER_FULL */
+    "wired",   /* SDL_JOYSTICK_POWER_WIRED */
+};
+SDL_COMPILE_TIME_ASSERT(power_level_strings, SDL_arraysize(power_level_strings) == SDL_JOYSTICK_POWER_MAX + 1);
+
 static SDL_Window *window = NULL;
 static SDL_Renderer *screen = NULL;
 static SDL_bool retval = SDL_FALSE;
@@ -587,6 +598,10 @@ loop(void *arg)
             }
             break;
 
+        case SDL_JOYBATTERYUPDATED:
+            SDL_Log("Controller %d battery state changed to %s\n", event.jbattery.which, power_level_strings[event.jbattery.level + 1]);
+            break;
+
         case SDL_MOUSEBUTTONDOWN:
             if (virtual_joystick) {
                 VirtualControllerMouseDown(event.button.x, event.button.y);