Vulkan-Hpp/samples/03_InitDevice/03_InitDevice.cpp

// 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 : 03_InitDevice
//                     Create and destroy a device

#include "../utils/utils.hpp"
#include "vulkan/vulkan.hpp"

#include <iostream>

static char const * AppName    = "03_InitDevice";
static char const * EngineName = "Vulkan.hpp";

int main( int /*argc*/, char ** /*argv*/ )
{
  try
  {
    vk::UniqueInstance instance = vk::su::createInstance( AppName, EngineName );
#if !defined( NDEBUG )
    vk::UniqueDebugUtilsMessengerEXT debugUtilsMessenger = vk::su::createDebugUtilsMessenger( instance );
#endif

    vk::PhysicalDevice physicalDevice = instance->enumeratePhysicalDevices().front();

    /* VULKAN_HPP_KEY_START */

    // get the QueueFamilyProperties of the first PhysicalDevice
    std::vector<vk::QueueFamilyProperties> queueFamilyProperties = physicalDevice.getQueueFamilyProperties();

    // get the first index into queueFamiliyProperties which supports graphics
    size_t graphicsQueueFamilyIndex = std::distance(
      queueFamilyProperties.begin(),
      std::find_if(
        queueFamilyProperties.begin(), queueFamilyProperties.end(), []( vk::QueueFamilyProperties const & qfp ) {
          return qfp.queueFlags & vk::QueueFlagBits::eGraphics;
        } ) );
    assert( graphicsQueueFamilyIndex < queueFamilyProperties.size() );

    // create a UniqueDevice
    float                     queuePriority = 0.0f;
    vk::DeviceQueueCreateInfo deviceQueueCreateInfo(
      vk::DeviceQueueCreateFlags(), static_cast<uint32_t>( graphicsQueueFamilyIndex ), 1, &queuePriority );
    vk::UniqueDevice device =
      physicalDevice.createDeviceUnique( vk::DeviceCreateInfo( vk::DeviceCreateFlags(), 1, &deviceQueueCreateInfo ) );

    // Note: No need to explicitly destroy the device, as the corresponding destroy function is
    // called by the destructor of the UniqueDevice on leaving this scope.

    /* VULKAN_HPP_KEY_END */
  }
  catch ( vk::SystemError & err )
  {
    std::cout << "vk::SystemError: " << err.what() << std::endl;
    exit( -1 );
  }
  catch ( ... )
  {
    std::cout << "unknown error\n";
    exit( -1 );
  }
  return 0;
}