Vulkan with SDL2 getting started

There are only a handful of Vulkan functions you need to be aware of with SDL:

http://wiki.libsdl.org/CategoryVulkan

Assuming you are already familiar with SDL here are some code snippets that may help...

// be sure to initialize your SDL window with the vulkan flag
window = SDL_CreateWindow("My App",
    SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
    1280, 720,
    SDL_WINDOW_VULKAN);

// initialize the vulkan instance
#include <SDL.h>
#include <SDL_vulkan.h>
#include <vector>

// in some init function...
  
uint32_t extensionCount;
SDL_Vulkan_GetInstanceExtensions(window, &extensionCount, nullptr);
std::vector<const char *> extensionNames(extensionCount);
SDL_Vulkan_GetInstanceExtensions(window, &extensionCount, extensionNames.data());

VkApplicationInfo appInfo {};
// TODO: fill this out

std::vector<const char *> layerNames {};
// uncomment below if you want to use validation layers
// layerNames.push_back("VK_LAYER_LUNARG_standard_validation");

VkInstanceCreateInfo info {};
info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
info.pApplicationInfo = &appInfo
info.enabledLayerCount = layerNames.size();
info.ppEnabledLayerNames = layerNames.data();
info.enabledExtensionCount = extensionNames.size();
info.ppEnabledExtensionNames = extensionNames.data();

VkResult res;
VkInstance instance;
res = vkCreateInstance(&info, nullptr, &instance);
if (res != VK_SUCCESS) {
  // do some error checking
}

// now that you have a window and a vulkan instance you need a surface
VkSurfaceKHR surface;
if (!SDL_Vulkan_CreateSurface(window, instance, &surface)) {
  // failed to create a surface!
}

// at this point you have a window, vulkan instance and a vulkan surface
// SDL is out of your way and you can use the vulkan api to enumerate the
// physical devices, create a logical device plus queues, and create your
// swapchain.

Hope that helps.