From 3cff588efff44a74aca28e00d718112851a5a0e5 Mon Sep 17 00:00:00 2001
From: Gregory Hainaut <gregory.hainaut@gmail.com>
Date: Sun, 16 Apr 2017 17:41:05 +0200
Subject: [PATCH] onepad: add an unique identifier

---
 plugins/onepad/GamePad.cpp      | 23 +++++++++++++++++++++++
 plugins/onepad/GamePad.h        |  5 +++++
 plugins/onepad/SDL/joystick.cpp |  8 ++++++++
 plugins/onepad/SDL/joystick.h   |  3 +++
 4 files changed, 39 insertions(+)

diff --git a/plugins/onepad/GamePad.cpp b/plugins/onepad/GamePad.cpp
index 08ebb92b60..21aa77c0a6 100644
--- a/plugins/onepad/GamePad.cpp
+++ b/plugins/onepad/GamePad.cpp
@@ -35,3 +35,26 @@ void GamePad::DoRumble(unsigned type, unsigned pad)
         s_vgamePad[id]->Rumble(type, pad);
     }
 }
+
+size_t GamePad::index_to_uid(int index)
+{
+    if ((index >= 0) && (index < (int)s_vgamePad.size()))
+        return s_vgamePad[index]->GetUniqueIdentifier();
+    else
+        return 0;
+}
+
+int GamePad::uid_to_index(size_t uid)
+{
+    for (int i = 0; i < (int)s_vgamePad.size(); ++i) {
+        if (s_vgamePad[i]->GetUniqueIdentifier() == uid)
+            return i;
+    }
+
+    // Current uid wasn't found maybe the pad was unplugged
+    // Fallback to the first pad which more friendly than nothing
+    if (!s_vgamePad.empty())
+        return 0;
+
+    return -1;
+}
diff --git a/plugins/onepad/GamePad.h b/plugins/onepad/GamePad.h
index 353582a4f8..4b37dca9eb 100644
--- a/plugins/onepad/GamePad.h
+++ b/plugins/onepad/GamePad.h
@@ -57,6 +57,11 @@ public:
         return m_deadzone;
     }
 
+    virtual size_t GetUniqueIdentifier() = 0;
+
+    static size_t index_to_uid(int index);
+    static int uid_to_index(size_t uid);
+
     bool IsProperlyInitialized()
     {
         return m_no_error;
diff --git a/plugins/onepad/SDL/joystick.cpp b/plugins/onepad/SDL/joystick.cpp
index 40955fe817..5c649739e4 100644
--- a/plugins/onepad/SDL/joystick.cpp
+++ b/plugins/onepad/SDL/joystick.cpp
@@ -151,6 +151,9 @@ JoystickInfo::JoystickInfo(int id)
         return;
     }
 
+    std::hash<std::string> hash_me;
+    m_unique_id = hash_me(std::string(guid));
+
     // Default haptic effect
     SDL_HapticEffect effects[NB_EFFECT];
     for (int i = 0; i < NB_EFFECT; i++) {
@@ -207,6 +210,11 @@ const char *JoystickInfo::GetName()
     return SDL_JoystickName(SDL_GameControllerGetJoystick(m_controller));
 }
 
+size_t JoystickInfo::GetUniqueIdentifier()
+{
+    return m_unique_id;
+}
+
 bool JoystickInfo::TestForce(float strength = 0.60)
 {
     // This code just use standard rumble to check that SDL handles the pad correctly! --3kinox
diff --git a/plugins/onepad/SDL/joystick.h b/plugins/onepad/SDL/joystick.h
index 1fce625c9b..bface1b00e 100644
--- a/plugins/onepad/SDL/joystick.h
+++ b/plugins/onepad/SDL/joystick.h
@@ -52,8 +52,11 @@ public:
 
     virtual void UpdateGamePadState();
 
+    virtual size_t GetUniqueIdentifier();
+
 private:
     SDL_GameController *m_controller;
     SDL_Haptic *m_haptic;
     std::array<int, NB_EFFECT> m_effects_id;
+    size_t m_unique_id;
 };