Added stubs for simple Steam Controller support

src/joystick/iphoneos/SDL_sysjoystick.m

@@ -26,12 +26,15 @@
 /* needed for SDL_IPHONE_MAX_GFORCE macro */
 #include "SDL_config_iphoneos.h"
 
+#include "SDL_assert.h"
 #include "SDL_events.h"
 #include "SDL_joystick.h"
 #include "SDL_hints.h"
 #include "SDL_stdinc.h"
 #include "../SDL_sysjoystick.h"
 #include "../SDL_joystick_c.h"
+#include "../steam/SDL_steamcontroller.h"
+
 
 #if !SDL_EVENTS_DISABLED
 #include "../../events/SDL_events_c.h"
@@ -242,7 +245,7 @@ SDL_SYS_RemoveJoystickDevice(SDL_JoystickDeviceItem *device)
 
     --numjoysticks;
 
-	SDL_PrivateJoystickRemoved(device->instance_id);
+    SDL_PrivateJoystickRemoved(device->instance_id);
 
     SDL_free(device->name);
     SDL_free(device);
@@ -266,6 +269,50 @@ SDL_AppleTVRemoteRotationHintChanged(void *udata, const char *name, const char *
 }
 #endif /* TARGET_OS_TV */
 
+static SDL_bool SteamControllerConnectedCallback(const char *name, SDL_JoystickGUID guid, int *device_instance)
+{
+    SDL_JoystickDeviceItem *device = (SDL_JoystickDeviceItem *)SDL_calloc(1, sizeof(SDL_JoystickDeviceItem));
+    if (device == NULL) {
+        return SDL_FALSE;
+    }
+
+    *device_instance = device->instance_id = instancecounter++;
+	device->name = SDL_strdup(name);
+	device->guid = guid;
+	SDL_GetSteamControllerInputs(&device->nbuttons,
+								 &device->naxes,
+								 &device->nhats);
+    device->m_bSteamController = SDL_TRUE;
+
+    if (deviceList == NULL) {
+        deviceList = device;
+    } else {
+        SDL_JoystickDeviceItem *lastdevice = deviceList;
+        while (lastdevice->next != NULL) {
+            lastdevice = lastdevice->next;
+        }
+        lastdevice->next = device;
+    }
+
+    ++numjoysticks;
+
+    SDL_PrivateJoystickAdded(numjoysticks - 1);
+
+    return SDL_TRUE;
+}
+
+static void SteamControllerDisconnectedCallback(int device_instance)
+{
+    SDL_JoystickDeviceItem *item;
+
+	for (item = deviceList; item; item = item->next) {
+        if (item->instance_id == device_instance) {
+			SDL_SYS_RemoveJoystickDevice(item);
+			break;
+        }
+    }
+}
+
 /* Function to scan the system for joysticks.
  * Joystick 0 should be the system default joystick.
  * It should return 0, or -1 on an unrecoverable fatal error.
@@ -276,6 +323,9 @@ SDL_SYS_JoystickInit(void)
     @autoreleasepool {
         NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
 
+        SDL_InitSteamControllers(SteamControllerConnectedCallback,
+                                 SteamControllerDisconnectedCallback);
+
 #if !TARGET_OS_TV
         if (SDL_GetHintBoolean(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, SDL_TRUE)) {
             /* Default behavior, accelerometer as joystick */
@@ -335,6 +385,7 @@ SDL_SYS_NumJoysticks(void)
 void
 SDL_SYS_JoystickDetect(void)
 {
+    SDL_UpdateSteamControllers();
 }
 
 /* Function to get the device-dependent name of a joystick */
@@ -628,6 +679,11 @@ SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
     if (device == NULL) {
         return;
     }
+    
+    if (device->m_bSteamController) {
+        SDL_UpdateSteamController(joystick);
+        return;
+    }
 
     if (device->accelerometer) {
         SDL_SYS_AccelerometerUpdate(joystick);
@@ -696,6 +752,8 @@ SDL_SYS_JoystickQuit(void)
 #endif /* !TARGET_OS_TV */
     }
 
+    SDL_QuitSteamControllers();
+
     numjoysticks = 0;
 }
 

src/joystick/iphoneos/SDL_sysjoystick_c.h

@@ -44,6 +44,9 @@ typedef struct joystick_hwdata
     int nbuttons;
     int nhats;
 
+    /* Steam Controller support */
+    SDL_bool m_bSteamController;
+
     struct joystick_hwdata *next;
 } joystick_hwdata;