First pass at VulkanViewer

tools/vulkan/InputHandler.cpp

Index: tools/vulkan/InputHandler.cpp
diff --git a/tools/vulkan/InputHandler.cpp b/tools/vulkan/InputHandler.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..200d838fab855af22495f1ee7aec725878e9e2fd
--- /dev/null
+++ b/tools/vulkan/InputHandler.cpp
@@ -0,0 +1,56 @@
+/*
+* 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 (isupper(key)) {
+        key = tolower(key);
+    }
+
+    if (!fKeys[key]) {
+        fKeys[key] = true;
+        fKeyPressed[key] = true;
+    }
+} 
+
+void InputHandler::onKeyUp(unsigned char key) {
+    if (isupper(key)) {
+        key = tolower(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;
+    }
+}