If everything goes well, the release of Qt 5.10 will come with at least 5 relevant examples. These are the following (with links to the doc snapshot pages), in increasing order of complexity:
The hellovulkancubes example, this time running on an NVIDIA Shield TV with Android 7.0
Checking the sources for these examples reveals one common aspect: they all use QVulkanWindow, the convenience QWindow subclass that manages the swapchain and window-specifics for you. While it will not always be suitable, QVulkanWindow can significantly decrease the time needed to get started with Vulkan rendering in Qt applications.
Now, what if one has to go the advanced way and needs full control over the swapchain and the window? That is perfectly doable as well, but getting started may be less obvious than the well-documented QVulkanWindow-based approach. Let's take a look.
There is currently no simple example for this since things tend to get fairly complicated quite quickly. The Qt sources do provide good references, though: besides the QVulkanWindow sources, there is also a manual test that demonstrates creating a Vulkan-enabled QWindow.
Looking at these revals the main rules for Vulkan-enabled QWindow subclasses:
What about accessing the Vulkan API? The options are well documented for QVulkanInstance. For most Qt-based applications the expectation is that the core Vulkan 1.0 API will be accessed through the wrapper objects returned from functions() and deviceFunctions(). When it comes to extensions, for instance in order to set up the swapchain when managing it manually, use getInstanceProcAddr().
This is the approach all examples and tests are using as well. This is not mandatory, the option of throwing in a LIBS+=-lvulkan, or using some other wrangler library is always there. Check also the Using C++ Bindings for Vulkan section in the QVulkanInstance docs.
That's all for now, see you in part 4!
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