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>

1 files changed, 108 insertions, 0 deletions

diff --git a/examples/vulkan/hellovulkantexture/hellovulkantexture.h b/examples/vulkan/hellovulkantexture/hellovulkantexture.h
new file mode 100644
index 0000000000..a8c96d1987
--- /dev/null
+++ b/examples/vulkan/hellovulkantexture/hellovulkantexture.h
@@ -0,0 +1,108 @@
+/****************************************************************************
+**
+** 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 <QVulkanWindow>
+#include <QImage>
+
+class VulkanRenderer : public QVulkanWindowRenderer
+{
+public:
+    VulkanRenderer(QVulkanWindow *w);
+
+    void initResources() override;
+    void initSwapChainResources() override;
+    void releaseSwapChainResources() override;
+    void releaseResources() override;
+
+    void startNextFrame() override;
+
+private:
+    VkShaderModule createShader(const QString &name);
+    bool createTexture(const QString &name);
+    bool createTextureImage(const QSize &size, VkImage *image, VkDeviceMemory *mem,
+                            VkImageTiling tiling, VkImageUsageFlags usage, uint32_t memIndex);
+    bool writeLinearImage(const QImage &img, VkImage image, VkDeviceMemory memory);
+    void ensureTexture();
+
+    QVulkanWindow *m_window;
+    QVulkanDeviceFunctions *m_devFuncs;
+
+    VkDeviceMemory m_bufMem = VK_NULL_HANDLE;
+    VkBuffer m_buf = VK_NULL_HANDLE;
+    VkDescriptorBufferInfo m_uniformBufInfo[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
+
+    VkDescriptorPool m_descPool = VK_NULL_HANDLE;
+    VkDescriptorSetLayout m_descSetLayout = VK_NULL_HANDLE;
+    VkDescriptorSet m_descSet[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
+
+    VkPipelineCache m_pipelineCache = VK_NULL_HANDLE;
+    VkPipelineLayout m_pipelineLayout = VK_NULL_HANDLE;
+    VkPipeline m_pipeline = VK_NULL_HANDLE;
+
+    VkSampler m_sampler = VK_NULL_HANDLE;
+    VkImage m_texImage = VK_NULL_HANDLE;
+    VkDeviceMemory m_texMem = VK_NULL_HANDLE;
+    bool m_texLayoutPending = false;
+    VkImageView m_texView = VK_NULL_HANDLE;
+    VkImage m_texStaging = VK_NULL_HANDLE;
+    VkDeviceMemory m_texStagingMem = VK_NULL_HANDLE;
+    bool m_texStagingPending = false;
+    QSize m_texSize;
+    VkFormat m_texFormat;
+
+    QMatrix4x4 m_proj;
+    float m_rotation = 0.0f;
+};
+
+class VulkanWindow : public QVulkanWindow
+{
+public:
+    QVulkanWindowRenderer *createRenderer() override;
+};