Introduce QVulkanWindow

A convenience subclass of QWindow that provides a Vulkan-capable
window with a double-buffered FIFO swapchain.

While advanced use cases are better served by a custom QWindow
subclass, many applications can benefit from having a convenient
helper that makes getting started easier.

Add also three examples of increasing complexity, and a variant that
shows embeddeding into widgets via QWindowContainer.

[ChangeLog][QtGui] Added QVulkanWindow, a convenience subclass of
QWindow.

Task-number: QTBUG-55981
Change-Id: I6cdc9ff1390ac6258e278377233fd369a0bfeddc
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

3 files changed, 118 insertions, 0 deletions

diff --git a/examples/vulkan/hellovulkantriangle/hellovulkantriangle.pro b/examples/vulkan/hellovulkantriangle/hellovulkantriangle.pro
new file mode 100644
index 0000000000..db016da3ac
--- /dev/null
+++ b/examples/vulkan/hellovulkantriangle/hellovulkantriangle.pro
@@ -0,0 +1,12 @@
+HEADERS += \
+    ../shared/trianglerenderer.h
+
+SOURCES += \
+    main.cpp \
+    ../shared/trianglerenderer.cpp
+
+RESOURCES += hellovulkantriangle.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/vulkan/hellovulkantriangle
+INSTALLS += target
diff --git a/examples/vulkan/hellovulkantriangle/hellovulkantriangle.qrc b/examples/vulkan/hellovulkantriangle/hellovulkantriangle.qrc
new file mode 100644
index 0000000000..489fc7295a
--- /dev/null
+++ b/examples/vulkan/hellovulkantriangle/hellovulkantriangle.qrc
@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file alias="color_vert.spv">../shared/color_vert.spv</file>
+    <file alias="color_frag.spv">../shared/color_frag.spv</file>
+</qresource>
+</RCC>
diff --git a/examples/vulkan/hellovulkantriangle/main.cpp b/examples/vulkan/hellovulkantriangle/main.cpp
new file mode 100644
index 0000000000..d3eef2e14a
--- /dev/null
+++ b/examples/vulkan/hellovulkantriangle/main.cpp
@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QGuiApplication>
+#include <QVulkanInstance>
+#include <QLoggingCategory>
+#include "../shared/trianglerenderer.h"
+
+Q_LOGGING_CATEGORY(lcVk, "qt.vulkan")
+
+class VulkanWindow : public QVulkanWindow
+{
+public:
+    QVulkanWindowRenderer *createRenderer() override;
+};
+
+QVulkanWindowRenderer *VulkanWindow::createRenderer()
+{
+    return new TriangleRenderer(this, true); // try MSAA, when available
+}
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    QLoggingCategory::setFilterRules(QStringLiteral("qt.vulkan=true"));
+
+    QVulkanInstance inst;
+
+#ifndef Q_OS_ANDROID
+    inst.setLayers(QByteArrayList() << "VK_LAYER_LUNARG_standard_validation");
+#else
+    inst.setLayers(QByteArrayList()
+                   << "VK_LAYER_GOOGLE_threading"
+                   << "VK_LAYER_LUNARG_parameter_validation"
+                   << "VK_LAYER_LUNARG_object_tracker"
+                   << "VK_LAYER_LUNARG_core_validation"
+                   << "VK_LAYER_LUNARG_image"
+                   << "VK_LAYER_LUNARG_swapchain"
+                   << "VK_LAYER_GOOGLE_unique_objects");
+#endif
+
+    if (!inst.create())
+        qFatal("Failed to create Vulkan instance: %d", inst.errorCode());
+
+    VulkanWindow w;
+    w.setVulkanInstance(&inst);
+
+    w.resize(1024, 768);
+    w.show();
+
+    return app.exec();
+}