From 073567558ea3728ed691f6491a9e0c37610cb6e3 Mon Sep 17 00:00:00 2001
From: Brad Davis <bdavis@saintandreas.org>
Date: Tue, 25 Aug 2015 16:40:13 -0700
Subject: [PATCH] Fix UserInputMapper event generation

---
 .../input-plugins/src/input-plugins/UserInputMapper.cpp      | 5 ++++-
 libraries/input-plugins/src/input-plugins/UserInputMapper.h  | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/libraries/input-plugins/src/input-plugins/UserInputMapper.cpp b/libraries/input-plugins/src/input-plugins/UserInputMapper.cpp
index b7533f39ec..fabb488ab4 100755
--- a/libraries/input-plugins/src/input-plugins/UserInputMapper.cpp
+++ b/libraries/input-plugins/src/input-plugins/UserInputMapper.cpp
@@ -226,9 +226,12 @@ void UserInputMapper::update(float deltaTime) {
     }
 
     // Scale all the channel step with the scale
+    static const float EPSILON =  0.01f;
     for (auto i = 0; i < NUM_ACTIONS; i++) {
         _actionStates[i] *= _actionScales[i];
-        if (_actionStates[i] > 0) {
+        // Emit only on change, and emit when moving back to 0
+        if (fabs(_actionStates[i] - _lastActionStates[i]) > EPSILON) {
+            _lastActionStates[i] = _actionStates[i];
             emit actionEvent(i, _actionStates[i]);
         }
         // TODO: emit signal for pose changes
diff --git a/libraries/input-plugins/src/input-plugins/UserInputMapper.h b/libraries/input-plugins/src/input-plugins/UserInputMapper.h
index 184b8d4776..464c39b64c 100755
--- a/libraries/input-plugins/src/input-plugins/UserInputMapper.h
+++ b/libraries/input-plugins/src/input-plugins/UserInputMapper.h
@@ -248,6 +248,7 @@ protected:
  
     std::vector<float> _actionStates = std::vector<float>(NUM_ACTIONS, 0.0f);
     std::vector<float> _actionScales = std::vector<float>(NUM_ACTIONS, 1.0f);
+    std::vector<float> _lastActionStates = std::vector<float>(NUM_ACTIONS, 0.0f);
     std::vector<PoseValue> _poseStates = std::vector<PoseValue>(NUM_ACTIONS);
 
     glm::mat4 _sensorToWorldMat;