RetroArch/apple/iOS/platform.m

/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2013-2014 - Jason Fetters
 *  Copyright (C) 2011-2015 - Daniel De Matteis
 * 
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>

#include "../../ui/drivers/cocoa/cocoa_common.h"
#include "../../input/drivers/cocoa_input.h"
#include "../../settings.h"
#ifdef HAVE_MFI
#include "../../input/drivers_hid/mfi_hid.h"
#endif

#include "../../input/drivers_hid/btstack_hid.h"

id<RetroArch_Platform> apple_platform;
static CFRunLoopObserverRef iterate_observer;

void apple_rarch_exited(void);

void main_exit_save_config(void);

static void rarch_draw(CFRunLoopObserverRef observer, CFRunLoopActivity activity, void *info)
{
    runloop_t *runloop = rarch_main_get_ptr();
    int ret            = 0;
    bool iterate       = iterate_observer && !runloop->is_paused;
    
    if (!iterate)
        return;
    
    ret                = rarch_main_iterate();
    
    if (ret == -1)
    {
        main_exit_save_config();
        main_exit(NULL);
        return;
    }
    
    if (runloop->is_idle)
        return;
    CFRunLoopWakeUp(CFRunLoopGetMain());
}

void apple_rarch_exited(void)
{
   [apple_platform unloadingCore];
}

apple_frontend_settings_t apple_frontend_settings;

enum frontend_powerstate ios_get_powerstate(int *seconds, int *percent)
{
    float level;
    enum frontend_powerstate ret = FRONTEND_POWERSTATE_NONE;
    UIDevice *uidev = [UIDevice currentDevice];
    
    if (!uidev)
        return ret;
    
    [uidev setBatteryMonitoringEnabled:true];
    
    switch (uidev.batteryState)
    {
        case UIDeviceBatteryStateCharging:
            ret = FRONTEND_POWERSTATE_CHARGING;
            break;
        case UIDeviceBatteryStateFull:
            ret = FRONTEND_POWERSTATE_CHARGED;
            break;
        case UIDeviceBatteryStateUnplugged:
            ret = FRONTEND_POWERSTATE_ON_POWER_SOURCE;
            break;
        case UIDeviceBatteryStateUnknown:
            break;
    }
    
    level = uidev.batteryLevel;
    
    *percent = ((level < 0.0f) ? -1 : ((int)((level * 100) + 0.5f)));

    [uidev setBatteryMonitoringEnabled:false];
    
    return ret;
}

void get_ios_version(int *major, int *minor)
{
    NSArray *decomposed_os_version = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."];
    
    if (major && decomposed_os_version.count > 0)
        *major = [decomposed_os_version[0] integerValue];
    if (minor && decomposed_os_version.count > 1)
        *minor = [decomposed_os_version[1] integerValue];
}

extern float cocoagl_gfx_ctx_get_native_scale(void);

/* Input helpers: This is kept here because it needs ObjC */
static void handle_touch_event(NSArray* touches)
{
   unsigned i;
   driver_t *driver          = driver_get_ptr();
   cocoa_input_data_t *apple = (cocoa_input_data_t*)driver->input_data;
   float scale               = cocoagl_gfx_ctx_get_native_scale();

   if (!apple)
      return;

   apple->touch_count = 0;
   
   for (i = 0; i < touches.count && (apple->touch_count < MAX_TOUCHES); i++)
   {
      CGPoint       coord;
      UITouch      *touch = [touches objectAtIndex:i];
      
      if (touch.view != [RAGameView get].view)
         continue;

      coord = [touch locationInView:[touch view]];

      if (touch.phase != UITouchPhaseEnded && touch.phase != UITouchPhaseCancelled)
      {
         apple->touches[apple->touch_count   ].screen_x = coord.x * scale;
         apple->touches[apple->touch_count ++].screen_y = coord.y * scale;
      }
   }
}

// iO7 Keyboard support
@interface UIEvent(iOS7Keyboard)
@property(readonly, nonatomic) long long _keyCode;
@property(readonly, nonatomic) _Bool _isKeyDown;
@property(retain, nonatomic) NSString *_privateInput;
@property(nonatomic) long long _modifierFlags;
- (struct __IOHIDEvent { }*)_hidEvent;
@end

@interface UIApplication(iOS7Keyboard)
- (id)_keyCommandForEvent:(UIEvent*)event;
@end

@interface RApplication : UIApplication
@end

@implementation RApplication

/* Keyboard handler for iOS 7. */

/* This is copied here as it isn't
 * defined in any standard iOS header */
enum
{
   NSAlphaShiftKeyMask = 1 << 16,
   NSShiftKeyMask      = 1 << 17,
   NSControlKeyMask    = 1 << 18,
   NSAlternateKeyMask  = 1 << 19,
   NSCommandKeyMask    = 1 << 20,
   NSNumericPadKeyMask = 1 << 21,
   NSHelpKeyMask       = 1 << 22,
   NSFunctionKeyMask   = 1 << 23,
   NSDeviceIndependentModifierFlagsMask = 0xffff0000U
};

- (id)_keyCommandForEvent:(UIEvent*)event
{
   /* This gets called twice with the same timestamp 
    * for each keypress, that's fine for polling
    * but is bad for business with events. */
   static double last_time_stamp;
   
   if (last_time_stamp == event.timestamp)
      return [super _keyCommandForEvent:event];
   last_time_stamp = event.timestamp;
   
   /* If the _hidEvent is null, [event _keyCode] will crash. 
    * (This happens with the on screen keyboard). */
   if (event._hidEvent)
   {
      NSString       *ch = (NSString*)event._privateInput;
      uint32_t character = 0;
      uint32_t mod       = 0;
      
      mod |= (event._modifierFlags & NSAlphaShiftKeyMask) ? RETROKMOD_CAPSLOCK : 0;
      mod |= (event._modifierFlags & NSShiftKeyMask     ) ? RETROKMOD_SHIFT    : 0;
      mod |= (event._modifierFlags & NSControlKeyMask   ) ? RETROKMOD_CTRL     : 0;
      mod |= (event._modifierFlags & NSAlternateKeyMask ) ? RETROKMOD_ALT      : 0;
      mod |= (event._modifierFlags & NSCommandKeyMask   ) ? RETROKMOD_META     : 0;
      mod |= (event._modifierFlags & NSNumericPadKeyMask) ? RETROKMOD_NUMLOCK  : 0;
      
      if (ch && ch.length != 0)
      {
         unsigned i;
         character = [ch characterAtIndex:0];

         cocoa_input_keyboard_event(event._isKeyDown,
               (uint32_t)event._keyCode, 0, mod,
               RETRO_DEVICE_KEYBOARD);
         
         for (i = 1; i < ch.length; i++)
            cocoa_input_keyboard_event(event._isKeyDown,
                  0, [ch characterAtIndex:i], mod,
                  RETRO_DEVICE_KEYBOARD);
      }
      
      cocoa_input_keyboard_event(event._isKeyDown,
            (uint32_t)event._keyCode, character, mod,
            RETRO_DEVICE_KEYBOARD);
   }

   return [super _keyCommandForEvent:event];
}

#define GSEVENT_TYPE_KEYDOWN 10
#define GSEVENT_TYPE_KEYUP 11

- (void)sendEvent:(UIEvent *)event
{
   int major, minor;
   [super sendEvent:event];

   if (event.allTouches.count)
      handle_touch_event(event.allTouches.allObjects);

   get_ios_version(&major, &minor);
    
   if ((major < 7) && [event respondsToSelector:@selector(_gsEvent)])
   {
      /* Keyboard event hack for iOS versions prior to iOS 7.
       *
       * Derived from: 
       * http://nacho4d-nacho4d.blogspot.com/2012/01/catching-keyboard-events-in-ios.html
       */
      const uint8_t *eventMem = objc_unretainedPointer([event performSelector:@selector(_gsEvent)]);
      int           eventType = eventMem ? *(int*)&eventMem[8] : 0;

      switch (eventType)
      {
         case GSEVENT_TYPE_KEYDOWN:
           case GSEVENT_TYPE_KEYUP:
            cocoa_input_keyboard_event(eventType == GSEVENT_TYPE_KEYDOWN,
                  *(uint16_t*)&eventMem[0x3C], 0, 0, RETRO_DEVICE_KEYBOARD);
            break;
      }
   }
}

@end

@implementation RetroArch_iOS

+ (RetroArch_iOS*)get
{
   return (RetroArch_iOS*)[[UIApplication sharedApplication] delegate];
}

- (void)applicationDidFinishLaunching:(UIApplication *)application
{
   apple_platform   = self;

   [self setDelegate:self];
    
   if (rarch_main(0, NULL))
       apple_rarch_exited();

   /* Setup window */
   self.window      = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   [self.window makeKeyAndVisible];

   [self pushViewController:[RAMainMenu new] animated:YES];

   [apple_platform loadingCore:nil withFile:nil];

   if (rarch_main(0, NULL))
      apple_rarch_exited();

#ifdef HAVE_MFI
   apple_gamecontroller_init();
#endif

   [self apple_start_iteration];
}

- (void) apple_start_iteration
{
    if (iterate_observer)
        return;
    
    iterate_observer = CFRunLoopObserverCreate(0, kCFRunLoopBeforeWaiting,
                                               true, 0, rarch_draw, 0);
    CFRunLoopAddObserver(CFRunLoopGetMain(), iterate_observer, kCFRunLoopCommonModes);
}

- (void) apple_stop_iteration
{
    if (!iterate_observer)
        return;
    
    CFRunLoopObserverInvalidate(iterate_observer);
    CFRelease(iterate_observer);
    iterate_observer = NULL;
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    
}

- (void)applicationWillTerminate:(UIApplication *)application
{
    [self apple_stop_iteration];
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
   settings_t *settings = config_get_ptr();
    
   if (settings->ui.companion_start_on_boot)
      return;
    
  [self showGameView];
}

- (void)applicationWillResignActive:(UIApplication *)application
{
   dispatch_async(dispatch_get_main_queue(),
                  ^{
                      main_exit_save_config();
                  });
   [self showPauseMenu: self];
}

-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
   NSString *filename = (NSString*)url.path.lastPathComponent;
   NSError     *error = nil;

   [[NSFileManager defaultManager] moveItemAtPath:[url path] toPath:[self.documentsDirectory stringByAppendingPathComponent:filename] error:&error];
   
   if (error)
      printf("%s\n", [[error description] UTF8String]);
   
   return true;
}

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
   cocoa_input_reset_icade_buttons();
   [self setToolbarHidden:![[viewController toolbarItems] count] animated:YES];
   
   [self refreshSystemConfig];
}

- (void)showGameView
{
   runloop_t *runloop = rarch_main_get_ptr();

   [self popToRootViewControllerAnimated:NO];
   [self setToolbarHidden:true animated:NO];
   [[UIApplication sharedApplication] setStatusBarHidden:true withAnimation:UIStatusBarAnimationNone];
   [[UIApplication sharedApplication] setIdleTimerDisabled:true];
   [self.window setRootViewController:[RAGameView get]];

   runloop->is_paused                     = false;
   runloop->is_idle                       = false;
   runloop->ui_companion_is_on_foreground = false;
}

- (IBAction)showPauseMenu:(id)sender
{
   runloop_t *runloop = rarch_main_get_ptr();
    
   if (runloop)
   {
       runloop->is_paused                     = true;
       runloop->is_idle                       = true;
       runloop->ui_companion_is_on_foreground = true;
   }

   [[UIApplication sharedApplication] setStatusBarHidden:false withAnimation:UIStatusBarAnimationNone];
   [[UIApplication sharedApplication] setIdleTimerDisabled:false];
   [self.window setRootViewController:self];
}

- (void)loadingCore:(NSString*)core withFile:(const char*)file
{
   btpad_set_inquiry_state(false);

   [self refreshSystemConfig];
   [self showGameView];
}

- (void)toggleUI
{
   runloop_t *runloop = rarch_main_get_ptr();

   if (runloop->ui_companion_is_on_foreground)
   {
      [self showGameView];
   }
   else
   {
      [self showPauseMenu:self];
   }
}

- (void)unloadingCore
{
   [self showPauseMenu:self];
   btpad_set_inquiry_state(true);
}

- (void)refreshSystemConfig
{
   bool small_keyboard, is_icade, is_btstack;
    
   /* Get enabled orientations */
   apple_frontend_settings.orientation_flags = UIInterfaceOrientationMaskAll;
   
   if (!strcmp(apple_frontend_settings.orientations, "landscape"))
      apple_frontend_settings.orientation_flags = UIInterfaceOrientationMaskLandscape;
   else if (!strcmp(apple_frontend_settings.orientations, "portrait"))
      apple_frontend_settings.orientation_flags = UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown;

   /* Set bluetooth mode */
   small_keyboard = !(strcmp(apple_frontend_settings.bluetooth_mode, "small_keyboard"));
   is_icade       = !(strcmp(apple_frontend_settings.bluetooth_mode, "icade"));
   is_btstack     = !(strcmp(apple_frontend_settings.bluetooth_mode, "btstack"));
       
   cocoa_input_enable_small_keyboard(small_keyboard);
   cocoa_input_enable_icade(is_icade);
   btstack_set_poweron(is_btstack);
}

@end

int main(int argc, char *argv[])
{
   @autoreleasepool {
      return UIApplicationMain(argc, argv, NSStringFromClass([RApplication class]), NSStringFromClass([RetroArch_iOS class]));
   }
}