Vulkan Guide for Nana Users

Suppose you know everything about Vulkan. The following instruction is written for windows. But it is almost the same for other systems

1. Enable two extensions when creating instance. VK_KHR_SURFACE_EXTENSION_NAME and VK_KHR_WIN32_SURFACE_EXTENSION_NAME
2. Check if the queue family support presentation support with vkGetPhysicalDeviceWin32PresentationSupportKHR. for C++ wrapper vk::PhysicalDevice::getSurfaceSupportKHR member function
3. Create vulkan surface for windows with vkCreateWin32SurfaceKHR. Pass nana::form::native_handle() to HWND parameter. for C++ wrapper vk::Instance::createWin32SurfaceKHR.
4. Move you render stuff to other thread.(It will save your time..) Nana will block on nana::exec call. Or you can use draw_through event. Please refer to OpenGL example in this article https://sourceforge.net/p/nanapro/blog/2015/01/tour-of-nana-10/

Currently c++ demo is finish. I will finish C version demo soon :-)

I've marked and comment on every important code. simply search "MODIFIED BY TIM"

Threading in Vulkan is delightful. WATCH!

Demo demo;

#include <thread>
#include <atomic>
void render_thread(Demo &demo, std::atomic<bool> &should_stop) 
{
	while (!should_stop.load()) {
		demo.run();
	}
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR pCmdLine, int nCmdShow) {
    // ...
    /* skipped */
    demo.init(argc, argv);

    // Free up the items we had to allocate for the command line arguments.
    if (argc > 0 && argv != nullptr) {
        for (int iii = 0; iii < argc; iii++) {
            if (argv[iii] != nullptr) {
                free(argv[iii]);
            }
        }
        free(argv);
    }

    demo.connection = hInstance;
	memcpy((char *)demo.name, (const char *)L"cube", APP_NAME_STR_LEN);
    demo.create_window();
    demo.init_vk_swapchain();

    demo.prepare();

    done = false;  // initialize loop condition variable
	
    std::atomic<bool> should_stop;
    should_stop.store(false);
    std::thread t(render_thread, std::ref(demo), std::ref(should_stop));

    nana::exec();
    should_stop.store(true);
    t.join();
    demo.cleanup();

    return (int)msg.wParam;
}

Known issues

1. Changing window caption frequently makes vulkan surface blink.