First pass at VulkanViewer

tools/vulkan/InputHandler.h

Index: tools/vulkan/InputHandler.h
diff --git a/tools/vulkan/InputHandler.h b/tools/vulkan/InputHandler.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f5a97d0c98aaaf21ac55b378b5c99d7f8137757
--- /dev/null
+++ b/tools/vulkan/InputHandler.h
@@ -0,0 +1,84 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#ifndef InputHandler_DEFINED
+#define InputHandler_DEFINED
+
+#include <string.h>
+
+class InputHandler
+{
+public:
+    InputHandler();
+
+    void onKeyDown(unsigned char key);                  // Handle key down event
+    void onKeyUp(unsigned char key);                    // Handle key up event
+    void onMouseDown(unsigned int h, unsigned int v);   // Handle mouse down event
+    void onMouseUp();                                   // Handle mouse up event
+
+    bool isKeyDown(unsigned char key) { 

[bsalomon, 2016/04/05 14:24:43]

should the getters be const?

[jvanverth1, 2016/04/05 18:16:48]

Done.

+        return fKeys[key]; 
+    }
+    bool isKeyUp(unsigned char key) { 
+        return !fKeys[key]; 
+    }
+    bool isKeyPressed(unsigned char key) {
+        return fKeyPressed[key];
+    }
+
+    bool isKeyReleased(unsigned char key) {
+        return fKeyReleased[key];
+    }
+
+    bool isMouseDown(unsigned int& h, unsigned int& v) {

[bsalomon, 2016/04/05 14:24:43]

To be consistent with our style h and v should be pointers not refs.

[jvanverth1, 2016/04/05 18:16:48]

Done.

+        if (fMouseDown)
+        {
+            h = fMouseX; 
+            v = fMouseY;
+            return true;
+        }
+        return false;
+    }
+
+    bool isMousePressed(unsigned int& h, unsigned int& v) {

[bsalomon, 2016/04/05 14:24:43]

ditto

[jvanverth1, 2016/04/05 18:16:48]

Done.

+        if (fMousePressed)
+        {
+            h = fMouseX; 
+            v = fMouseY;
+            return true;
+        }
+        return false;
+    }
+
+    bool IsMouseReleased() {
+        return fMouseReleased;
+    }
+
+    inline void Update() {
+        memset(fKeyPressed, 0, sizeof(bool) * 256);
+        memset(fKeyReleased, 0, sizeof(bool) * 256);
+        fMousePressed = false;
+        fMouseReleased = false;
+    }
+
+private:
+    // assumes ASCII keystrokes only
+    bool fKeys[256];            
+    bool fKeyPressed[256];
+    bool fKeyReleased[256];
+
+    bool fMouseDown;
+    bool fMousePressed;
+    bool fMouseReleased;
+    unsigned int fMouseX;
+    unsigned int fMouseY;
+
+    InputHandler(const InputHandler& other);
+    InputHandler& operator=(const InputHandler& other);
+};
+
+#endif