text: // Copyright(c) 2018-2019, NVIDIA CORPORATION. All rights reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  //
  // VulkanHpp Samples : 05_InitSwapchain
  //                     Initialize a swapchain
  
  #include "../utils/utils.hpp"
  #include "vulkan/vulkan.hpp"
  #include <iostream>
  
  static char const* AppName = "05_InitSwapchain";
  static char const* EngineName = "Vulkan.hpp";
  
  int main(int /*argc*/, char ** /*argv*/)
  {
    try
    {
      vk::UniqueInstance instance = vk::su::createInstance(AppName, EngineName, {}, vk::su::getInstanceExtensions());
  #if !defined(NDEBUG)
      vk::UniqueDebugUtilsMessengerEXT debugUtilsMessenger = vk::su::createDebugUtilsMessenger(instance);
  #endif
  
      vk::PhysicalDevice physicalDevice = instance->enumeratePhysicalDevices().front();
  
      std::vector<vk::QueueFamilyProperties> queueFamilyProperties = physicalDevice.getQueueFamilyProperties();
      uint32_t graphicsQueueFamilyIndex = vk::su::findGraphicsQueueFamilyIndex(queueFamilyProperties);
  
      /* VULKAN_HPP_KEY_START */
  
      uint32_t width = 64;
      uint32_t height = 64;
  #if defined(VK_USE_PLATFORM_WIN32_KHR)
      HWND window = vk::su::initializeWindow(AppName, AppName, width, height);
  
      vk::UniqueSurfaceKHR surface = instance->createWin32SurfaceKHRUnique(vk::Win32SurfaceCreateInfoKHR(vk::Win32SurfaceCreateFlagsKHR(), GetModuleHandle(nullptr), window));
  #else
  #pragma error "unhandled platform"
  #endif
  
      // determine a queueFamilyIndex that suports present
      // first check if the graphicsQueueFamiliyIndex is good enough
      size_t presentQueueFamilyIndex = physicalDevice.getSurfaceSupportKHR(static_cast<uint32_t>(graphicsQueueFamilyIndex), surface.get()) ? graphicsQueueFamilyIndex : queueFamilyProperties.size();
      if (presentQueueFamilyIndex == queueFamilyProperties.size())
      {
        // the graphicsQueueFamilyIndex doesn't support present -> look for an other family index that supports both graphics and present
        for (size_t i = 0; i < queueFamilyProperties.size(); i++)
        {
          if ((queueFamilyProperties[i].queueFlags & vk::QueueFlagBits::eGraphics) && physicalDevice.getSurfaceSupportKHR(static_cast<uint32_t>(i), surface.get()))
          {
            graphicsQueueFamilyIndex = vk::su::checked_cast<uint32_t>(i);
            presentQueueFamilyIndex = i;
            break;
          }
        }
        if (presentQueueFamilyIndex == queueFamilyProperties.size())
        {
          // there's nothing like a single family index that supports both graphics and present -> look for an other family index that supports present
          for (size_t i = 0; i < queueFamilyProperties.size(); i++)
          {
            if (physicalDevice.getSurfaceSupportKHR(static_cast<uint32_t>(i), surface.get()))
            {
              presentQueueFamilyIndex = i;
              break;
            }
          }
        }
      }
      if ((graphicsQueueFamilyIndex == queueFamilyProperties.size()) || (presentQueueFamilyIndex == queueFamilyProperties.size()))
      {
        throw std::runtime_error("Could not find a queue for graphics or present -> terminating");
      }
  
      // create a device
      vk::UniqueDevice device = vk::su::createDevice(physicalDevice, graphicsQueueFamilyIndex, vk::su::getDeviceExtensions());
  
      // get the supported VkFormats
      std::vector<vk::SurfaceFormatKHR> formats = physicalDevice.getSurfaceFormatsKHR(surface.get());
      assert(!formats.empty());
      vk::Format format = (formats[0].format == vk::Format::eUndefined) ? vk::Format::eB8G8R8A8Unorm : formats[0].format;
  
      vk::SurfaceCapabilitiesKHR surfaceCapabilities = physicalDevice.getSurfaceCapabilitiesKHR(surface.get());
      VkExtent2D swapchainExtent;
      if (surfaceCapabilities.currentExtent.width == std::numeric_limits<uint32_t>::max())
      {
        // If the surface size is undefined, the size is set to the size of the images requested.
        swapchainExtent.width = vk::su::clamp(width, surfaceCapabilities.minImageExtent.width, surfaceCapabilities.maxImageExtent.width);
        swapchainExtent.height = vk::su::clamp(height, surfaceCapabilities.minImageExtent.height, surfaceCapabilities.maxImageExtent.height);
      }
      else
      {
        // If the surface size is defined, the swap chain size must match
        swapchainExtent = surfaceCapabilities.currentExtent;
      }
  
      // The FIFO present mode is guaranteed by the spec to be supported
      vk::PresentModeKHR swapchainPresentMode = vk::PresentModeKHR::eFifo;
  
      vk::SurfaceTransformFlagBitsKHR preTransform = (surfaceCapabilities.supportedTransforms & vk::SurfaceTransformFlagBitsKHR::eIdentity) ? vk::SurfaceTransformFlagBitsKHR::eIdentity : surfaceCapabilities.currentTransform;
  
      vk::CompositeAlphaFlagBitsKHR compositeAlpha =
        (surfaceCapabilities.supportedCompositeAlpha & vk::CompositeAlphaFlagBitsKHR::ePreMultiplied) ? vk::CompositeAlphaFlagBitsKHR::ePreMultiplied :
        (surfaceCapabilities.supportedCompositeAlpha & vk::CompositeAlphaFlagBitsKHR::ePostMultiplied) ? vk::CompositeAlphaFlagBitsKHR::ePostMultiplied :
        (surfaceCapabilities.supportedCompositeAlpha & vk::CompositeAlphaFlagBitsKHR::eInherit) ? vk::CompositeAlphaFlagBitsKHR::eInherit : vk::CompositeAlphaFlagBitsKHR::eOpaque;
  
      vk::SwapchainCreateInfoKHR swapChainCreateInfo(vk::SwapchainCreateFlagsKHR(), surface.get(), surfaceCapabilities.minImageCount, format, vk::ColorSpaceKHR::eSrgbNonlinear,
        swapchainExtent, 1, vk::ImageUsageFlagBits::eColorAttachment, vk::SharingMode::eExclusive, 0, nullptr, preTransform, compositeAlpha, swapchainPresentMode, true, nullptr);
  
      uint32_t queueFamilyIndices[2] = { static_cast<uint32_t>(graphicsQueueFamilyIndex), static_cast<uint32_t>(presentQueueFamilyIndex) };
      if (graphicsQueueFamilyIndex != presentQueueFamilyIndex)
      {
        // If the graphics and present queues are from different queue families, we either have to explicitly transfer ownership of images between
        // the queues, or we have to create the swapchain with imageSharingMode as VK_SHARING_MODE_CONCURRENT
        swapChainCreateInfo.imageSharingMode = vk::SharingMode::eConcurrent;
        swapChainCreateInfo.queueFamilyIndexCount = 2;
        swapChainCreateInfo.pQueueFamilyIndices = queueFamilyIndices;
      }
  
      vk::UniqueSwapchainKHR swapChain = device->createSwapchainKHRUnique(swapChainCreateInfo);
  
      std::vector<vk::Image> swapChainImages = device->getSwapchainImagesKHR(swapChain.get());
  
      std::vector<vk::UniqueImageView> imageViews;
      imageViews.reserve(swapChainImages.size());
      vk::ComponentMapping componentMapping(vk::ComponentSwizzle::eR, vk::ComponentSwizzle::eG, vk::ComponentSwizzle::eB, vk::ComponentSwizzle::eA);
      vk::ImageSubresourceRange subResourceRange(vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1);
      for (auto image : swapChainImages)
      {
        vk::ImageViewCreateInfo imageViewCreateInfo(vk::ImageViewCreateFlags(), image, vk::ImageViewType::e2D, format, componentMapping, subResourceRange);
        imageViews.push_back(device->createImageViewUnique(imageViewCreateInfo));
      }
  
  #if defined(VK_USE_PLATFORM_WIN32_KHR)
      DestroyWindow(window);
  #else
  #pragma error "unhandled platform"
  #endif
  
      // Note: No need to explicitly destroy the ImageViews or the swapChain, as the corresponding destroy
      // functions are called by the destructor of the UniqueImageView and the UniqueSwapChainKHR on leaving this scope.
  
      /* VULKAN_HPP_KEY_END */
    }
    catch (vk::SystemError err)
    {
      std::cout << "vk::SystemError: " << err.what() << std::endl;
      exit(-1);
    }
    catch (std::runtime_error err)
    {
      std::cout << "std::runtime_error: " << err.what() << std::endl;
      exit(-1);
    }
    catch (...)
    {
      std::cout << "unknown error\n";
      exit(-1);
    }
    return 0;
  }
  