First pass at VulkanViewer

tools/vulkan/VulkanViewer.cpp

+/*
+* Copyright 2016 Google Inc.

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

Would it make since to put everything related to the viewer in it's own dir
(e.g. tools/vulkan/viewer) to make it really clear what is framework and what is
app-specific?

[jvanverth1, 2016/04/05 18:16:49]

Done.

+*
+* 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"
+
+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) {
+    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->release();
+    delete fWindow;
+}
+
+bool VulkanViewer::onKey(int key, bool keyDown) {
+    return false;
+}
+
+bool VulkanViewer::onMouse(int x, int y, bool mouseDown) {
+    return false;
+}
+
+void VulkanViewer::onPaint(SkCanvas* canvas) {
+    canvas->scale(20, 20);
+    canvas->translate(13, 13);
+
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    paint.setStyle(SkPaint::kStroke_Style);
+    paint.setStrokeWidth(SK_Scalar1 / 2);
+
+    const SkScalar delta = paint.getStrokeWidth() * 3 / 2;
+    SkRect r = SkRect::MakeXYWH(-12, -12, 24, 24);
+    SkRandom rand;
+
+    SkScalar sign = 1;
+    while (r.width() > paint.getStrokeWidth() * 2) {
+        SkAutoCanvasRestore acr(canvas, true);
+        //            canvas->rotate(fRotate * sign);
+
+        paint.setColor(rand.nextU() | (0xFF << 24));
+        canvas->drawOval(r, paint);
+        r.inset(delta, delta);
+        sign = -sign;
+    }
+
+}
+
+void VulkanViewer::onIdle(float dt) {
+    fWindow->onPaint();
+}