From 0b8e8ad4f2067313d677d3c05b65b404670a8838 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=8E=E9=80=9A=E6=B4=B2?= <carter.li@eoitek.com>
Date: Wed, 1 Feb 2023 20:23:46 +0800
Subject: [PATCH] Gamepad (macOS): add support

---
 CMakeLists.txt                        |  2 +-
 src/detection/gamepad/gamepad_apple.c | 41 +++++++++++++++++++++++++++
 src/util/apple/cf_helpers.h           | 13 +++++++++
 3 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 src/detection/gamepad/gamepad_apple.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3a97a77fe..27853f760 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -464,7 +464,7 @@ elseif(APPLE)
         src/detection/gpu/gpu_apple.c
         src/detection/host/host_apple.c
         src/detection/localip/localip_linux.c
-        src/detection/gamepad/gamepad_nosupport.c
+        src/detection/gamepad/gamepad_apple.c
         src/detection/media/media_apple.m
         src/detection/memory/memory_apple.c
         src/detection/opengl/opengl_apple.c
diff --git a/src/detection/gamepad/gamepad_apple.c b/src/detection/gamepad/gamepad_apple.c
new file mode 100644
index 000000000..154f1c587
--- /dev/null
+++ b/src/detection/gamepad/gamepad_apple.c
@@ -0,0 +1,41 @@
+#include "gamepad.h"
+#include "util/apple/cf_helpers.h"
+
+#include <IOKit/IOKitLib.h>
+#include <IOKit/hid/IOHIDLib.h>
+
+static void enumSet(const void* value, void *context)
+{
+    CFStringRef product = IOHIDDeviceGetProperty((IOHIDDeviceRef) value, CFSTR(kIOHIDProductKey));
+    CFStringRef serialNumber = IOHIDDeviceGetProperty((IOHIDDeviceRef) value, CFSTR(kIOHIDSerialNumberKey));
+    FFGamepadDevice* device = (FFGamepadDevice*) ffListAdd((FFlist*) context);
+    ffStrbufInit(&device->identifier);
+    ffCfStrGetString(serialNumber, &device->identifier);
+    ffStrbufInit(&device->name);
+    ffCfStrGetString(product, &device->name);
+}
+
+const char* ffDetectGamepad(FF_MAYBE_UNUSED const FFinstance* instance, FFlist* devices /* List of FFGamepadDevice */)
+{
+    IOHIDManagerRef FF_CFTYPE_AUTO_RELEASE manager = IOHIDManagerCreate(kCFAllocatorDefault, kIOHIDOptionsTypeNone);
+    if (IOHIDManagerOpen(manager, kIOHIDOptionsTypeNone) != kIOReturnSuccess)
+        return "IOHIDManagerOpen() failed";
+
+    CFNumberRef FF_CFTYPE_AUTO_RELEASE genericDesktop = ffCfCreateInt(kHIDPage_GenericDesktop);
+    CFNumberRef FF_CFTYPE_AUTO_RELEASE gamePad = ffCfCreateInt(kHIDUsage_GD_GamePad);
+    CFDictionaryRef FF_CFTYPE_AUTO_RELEASE matching = CFDictionaryCreate(kCFAllocatorDefault, (const void **)(CFStringRef[]){
+        CFSTR(kIOHIDDeviceUsagePageKey),
+        CFSTR(kIOHIDDeviceUsageKey)
+    }, (const void **)(CFNumberRef[]){
+        genericDesktop,
+        gamePad
+    }, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
+    IOHIDManagerSetDeviceMatching(manager, matching);
+
+    CFSetRef FF_CFTYPE_AUTO_RELEASE set = IOHIDManagerCopyDevices(manager);
+    if (set)
+        CFSetApplyFunction(set, &enumSet, devices);
+    IOHIDManagerClose(manager, 0);
+
+    return NULL;
+}
diff --git a/src/util/apple/cf_helpers.h b/src/util/apple/cf_helpers.h
index d3cb66d43..52755bb8b 100644
--- a/src/util/apple/cf_helpers.h
+++ b/src/util/apple/cf_helpers.h
@@ -13,4 +13,17 @@ const char* ffCfDictGetBool(CFDictionaryRef dict, CFStringRef key, bool* result)
 const char* ffCfDictGetInt(CFDictionaryRef dict, CFStringRef key, int* result);
 const char* ffCfDictGetDict(CFDictionaryRef dict, CFStringRef key, CFDictionaryRef* result);
 
+static inline CFNumberRef ffCfCreateInt(int value)
+{
+    return CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &value);
+}
+
+static inline void cfReleaseWrapper(void* type)
+{
+    if (*(CFTypeRef*) type)
+        CFRelease(*(CFTypeRef*) type);
+}
+
+#define FF_CFTYPE_AUTO_RELEASE __attribute__((__cleanup__(cfReleaseWrapper)))
+
 #endif