From 1d9a4748de2eda0cdd25f0e2ae92d2915abd8e07 Mon Sep 17 00:00:00 2001
From: ocornut <omarcornut@gmail.com>
Date: Sun, 5 Oct 2014 09:08:57 +0100
Subject: [PATCH] Added a UserData void *pointer so that the callback functions
 can access user state

"Just in case a project has adverse reactions to adding globals or
statics in their own code."
---
 imgui.cpp | 1 +
 imgui.h   | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/imgui.cpp b/imgui.cpp
index 16110ed65..93acf44d2 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -331,6 +331,7 @@ ImGuiIO::ImGuiIO()
     MouseDoubleClickMaxDist = 6.0f;
 
     // User functions
+    UserData = NULL;
     RenderDrawListsFn = NULL;
     MemAllocFn = malloc;
     MemReallocFn = realloc;
diff --git a/imgui.h b/imgui.h
index 576a8693c..65358aa06 100644
--- a/imgui.h
+++ b/imgui.h
@@ -427,6 +427,9 @@ struct ImGuiIO
     // User Functions
     //------------------------------------------------------------------
 
+    // Store your own data for retrieval by callbacks.
+    void*       UserData;                   // = NULL
+
     // REQUIRED: rendering function. 
     // See example code if you are unsure of how to implement this.
     void        (*RenderDrawListsFn)(ImDrawList** const draw_lists, int count);