First pass at VulkanViewer

tools/vulkan/viewer/VulkanViewer.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 "VulkanViewer.h"
+
+#include "SkCanvas.h"
+#include "SkRandom.h"
+#include "SkCommonFlags.h"
+
+DEFINE_string(key, "",
+              "Space-separated key/value pairs to add to JSON identifying this builder.");
+
+Application* Application::Create(int argc, char** argv, void* platformData) {
+    return new VulkanViewer(argc, argv, platformData);
+}
+
+static bool on_key_handler(int key, bool keyDown, void* userData) {
+    VulkanViewer* vv = reinterpret_cast<VulkanViewer*>(userData);
+
+    return vv->onKey(key, keyDown);
+}
+
+static bool on_mouse_handler(int x, int y, bool mouseDown, void* userData) {
+    VulkanViewer* vv = reinterpret_cast<VulkanViewer*>(userData);
+
+    return vv->onMouse(x, y, mouseDown);
+}
+
+static void on_paint_handler(SkCanvas* canvas, void* userData) {
+    VulkanViewer* vv = reinterpret_cast<VulkanViewer*>(userData);
+
+    return vv->onPaint(canvas);
+}
+
+VulkanViewer::VulkanViewer(int argc, char** argv, void* platformData) :
+    fGMs(skiagm::GMRegistry::Head()){
+
+    fWindow = Window::CreateNativeWindow(platformData);
+    fWindow->attach(Window::kVulkan_BackendType, 0, nullptr);
+
+    // register callbacks
+    fWindow->registerKeyFunc(on_key_handler, this);
+    fWindow->registerMouseFunc(on_mouse_handler, this);
+    fWindow->registerPaintFunc(on_paint_handler, this);
+
+    fWindow->setTitle("VulkanViewer");
+    fWindow->show();
+}
+
+VulkanViewer::~VulkanViewer() {
+    fWindow->detach();
+    delete fWindow;
+}
+
+bool VulkanViewer::onKey(int key, bool keyDown) {
+    if (keyDown) {
+        fInputHandler.onKeyDown(key);
+    } else {
+        fInputHandler.onKeyUp(key);
+    }
+    return true;
+}
+
+bool VulkanViewer::onMouse(int x, int y, bool mouseDown) {
+    if (mouseDown) {
+        fInputHandler.onMouseDown(x, y);
+    } else {
+        fInputHandler.onMouseUp();
+    }
+    return true;
+}
+
+void VulkanViewer::onPaint(SkCanvas* canvas) {
+    SkAutoTDelete<skiagm::GM> gm(fGMs->factory()(nullptr));
+
+    canvas->save();
+
+    gm->draw(canvas);
+
+    canvas->restore();
+}
+
+void VulkanViewer::onIdle(float dt) {
+    if (fInputHandler.isKeyPressed('l') || fInputHandler.isKeyPressed('L')) {
+        fGMs = fGMs->next();
+    }
+    fWindow->onPaint();
+
+    fInputHandler.Update();
+}