From 6b62494ee487eded3960c1c7e0a02fcb142642a9 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Tue, 13 Oct 2020 21:08:15 -0700
Subject: [PATCH] Added support for controller battery status on iOS 14

---
 src/joystick/iphoneos/SDL_sysjoystick.m | 34 +++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/joystick/iphoneos/SDL_sysjoystick.m b/src/joystick/iphoneos/SDL_sysjoystick.m
index 55374f593..d956f82b0 100644
--- a/src/joystick/iphoneos/SDL_sysjoystick.m
+++ b/src/joystick/iphoneos/SDL_sysjoystick.m
@@ -768,6 +768,40 @@ IOS_MFIJoystickUpdate(SDL_Joystick * joystick)
             }
             joystick->hwdata->num_pause_presses = 0;
         }
+
+        if (@available(iOS 14.0, tvOS 14.0, *)) {
+            GCDeviceBattery *battery = controller.battery;
+            if (battery) {
+                SDL_JoystickPowerLevel ePowerLevel = SDL_JOYSTICK_POWER_UNKNOWN;
+
+                switch (battery.batteryState) {
+                case GCDeviceBatteryStateDischarging:
+                    {
+                        float power_level = battery.batteryLevel;
+                        if (power_level <= 0.05f) {
+                            ePowerLevel = SDL_JOYSTICK_POWER_EMPTY;
+                        } else if (power_level <= 0.20f) {
+                            ePowerLevel = SDL_JOYSTICK_POWER_LOW;
+                        } else if (power_level <= 0.70f) {
+                            ePowerLevel = SDL_JOYSTICK_POWER_MEDIUM;
+                        } else {
+                            ePowerLevel = SDL_JOYSTICK_POWER_FULL;
+                        }
+                    }
+                    break;
+                case GCDeviceBatteryStateCharging:
+                    ePowerLevel = SDL_JOYSTICK_POWER_WIRED;
+                    break;
+                case GCDeviceBatteryStateFull:
+                    ePowerLevel = SDL_JOYSTICK_POWER_FULL;
+                    break;
+                default:
+                    break;
+                }
+
+                SDL_PrivateJoystickBatteryLevel(joystick, ePowerLevel);
+            }
+        }
     }
 #endif /* SDL_JOYSTICK_MFI */
 }