First pass at VulkanViewer

tools/vulkan/Window.h

+/*
+* 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 Window_DEFINED
+#define Window_DEFINED
+
+class SkCanvas;
+class VulkanTestContext;
+
+class Window {
+public:
+    static Window* CreateNativeWindow(void* platformData);
+
+    virtual ~Window() {};
+
+    virtual void setTitle(const char*) = 0;
+    virtual void show() = 0;
+
+    struct AttachmentInfo {
+        int fSampleCount;
+        int fStencilBits;
+    };
+
+    enum BackEndTypes {
+        kNativeGL_BackendType,
+        kVulkan_BackendType
+    };
+
+    virtual bool attach(BackEndTypes attachType, int msaaSampleCount, AttachmentInfo*) = 0;
+    void detach();
+
+    // input handling
+    typedef bool(*OnKeyFunc)(int key, bool down, void* userData);
+    typedef bool(*OnMouseFunc)(int x, int y, bool down, void* userData);
+    typedef void(*OnPaintFunc)(SkCanvas*, void* userData);
+
+    void registerKeyFunc(OnKeyFunc func, void* userData) {
+        fKeyFunc = func;
+        fKeyUserData = userData;
+    }
+
+    void registerMouseFunc(OnMouseFunc func, void* userData) {
+        fMouseFunc = func;
+        fMouseUserData = userData;
+    }
+
+    void registerPaintFunc(OnPaintFunc func, void* userData) {
+        fPaintFunc = func;
+        fPaintUserData = userData;
+    }
+
+    void onPaint();
+    void onSize();
+
+protected:
+    Window();
+
+    OnKeyFunc    fKeyFunc;
+    void*        fKeyUserData;
+    OnMouseFunc  fMouseFunc;
+    void*        fMouseUserData;
+    OnPaintFunc  fPaintFunc;
+    void*        fPaintUserData;
+
+    VulkanTestContext* fTestContext;
+};
+
+
+#endif