Clean up input handling in VulkanViewer

tools/vulkan/viewer/InputHandler.cpp

-/*
-* Copyright 2016 Google Inc.
-*
-* Use of this source code is governed by a BSD-style license that can be
-* found in the LICENSE file.
-*/
-
-#include "InputHandler.h"
-#include <ctype.h>
-
-InputHandler::InputHandler() : fMouseDown(false), fMousePressed(false), fMouseReleased(false)
-                             , fMouseX(0), fMouseY(0) {
-    // clear key states
-    memset(fKeys, 0, sizeof(bool) * 256);
-    memset(fKeyPressed, 0, sizeof(bool) * 256);
-    memset(fKeyReleased, 0, sizeof(bool) * 256);
-}
-
-void InputHandler::onKeyDown(unsigned char key) {
-    if (!fKeys[key]) {
-        fKeys[key] = true;
-        fKeyPressed[key] = true;
-    }
-} 
-
-void InputHandler::onKeyUp(unsigned char key) {
-    if (fKeys[key]) {
-        fKeys[key] = false;
-        fKeyReleased[key] = true;
-    }
-}
-
-void InputHandler::onMouseDown(unsigned int h, unsigned int v) {
-    if (!fMouseDown) {
-        fMouseDown = true;
-        fMousePressed = true;
-    }
-
-    fMouseX = h;
-    fMouseY = v;
-}
-
-void InputHandler::onMouseUp() {
-    if (fMouseDown)  {
-        fMouseDown = false;
-        fMouseReleased = true;
-    }
-}