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50 
51 //! [0]
52   class VulkanRenderer : public QVulkanWindowRenderer
53   {
54   public:
VulkanRenderer(QVulkanWindow * w)55       VulkanRenderer(QVulkanWindow *w) : m_window(w) { }
56 
initResources()57       void initResources() override
58       {
59           m_devFuncs = m_window->vulkanInstance()->deviceFunctions(m_window->device());
60           ...
61       }
initSwapChainResources()62       void initSwapChainResources() override { ... }
releaseSwapChainResources()63       void releaseSwapChainResources() override { ... }
releaseResources()64       void releaseResources() override { ... }
65 
startNextFrame()66       void startNextFrame() override
67       {
68           VkCommandBuffer cmdBuf = m_window->currentCommandBuffer();
69           ...
70           m_devFuncs->vkCmdBeginRenderPass(...);
71           ...
72           m_window->frameReady();
73       }
74 
75   private:
76       QVulkanWindow *m_window;
77       QVulkanDeviceFunctions *m_devFuncs;
78   };
79 
80   class VulkanWindow : public QVulkanWindow
81   {
82   public:
createRenderer()83       QVulkanWindowRenderer *createRenderer() override {
84           return new VulkanRenderer(this);
85       }
86   };
87 
main(int argc,char * argv[])88   int main(int argc, char *argv[])
89   {
90       QGuiApplication app(argc, argv);
91 
92       QVulkanInstance inst;
93       // enable the standard validation layers, when available
94       inst.setLayers(QByteArrayList() << "VK_LAYER_LUNARG_standard_validation");
95       if (!inst.create())
96           qFatal("Failed to create Vulkan instance: %d", inst.errorCode());
97 
98       VulkanWindow w;
99       w.setVulkanInstance(&inst);
100       w.showMaximized();
101 
102       return app.exec();
103   }
104 //! [0]
105 
106 //! [1]
107     class Renderer {
108         ...
109         VkDescriptorBufferInfo m_uniformBufInfo[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
110     };
111 
startNextFrame()112     void Renderer::startNextFrame()
113     {
114         VkDescriptorBufferInfo &uniformBufInfo(m_uniformBufInfo[m_window->currentFrame()]);
115         ...
116     }
117 //! [1]
118 
119 //! [2]
120     class Renderer {
121         ...
122         VkDescriptorBufferInfo m_uniformBufInfo[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
123     };
124 
startNextFrame()125     void Renderer::startNextFrame()
126     {
127         const int count = m_window->concurrentFrameCount();
128         for (int i = 0; i < count; ++i)
129             m_uniformBufInfo[i] = ...
130         ...
131     }
132 //! [2]
133