// Copyright(c) 2018, 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 : 08_InitPipelineLayout
//                     Initialize a descriptor and pipeline layout

#include <iostream>
#include "vulkan/vulkan.hpp"

static char const* AppName = "08_InitPipelineLayout";
static char const* EngineName = "Vulkan.hpp";

int main(int argc, char *argv[])
{
  try
  {
    vk::ApplicationInfo appInfo(AppName, 1, EngineName, 1, VK_API_VERSION_1_1);
    vk::InstanceCreateInfo instanceCreateInfo({}, &appInfo);
    vk::UniqueInstance instance = vk::createInstanceUnique(instanceCreateInfo);

    std::vector<vk::PhysicalDevice> physicalDevices = instance->enumeratePhysicalDevices();
    assert(!physicalDevices.empty());

    // determine a queueFamilyIndex that supports graphics
    std::vector<vk::QueueFamilyProperties> queueFamilyProperties = physicalDevices[0].getQueueFamilyProperties();
    size_t graphicsQueueFamilyIndex = std::distance(queueFamilyProperties.begin(),
      std::find_if(queueFamilyProperties.begin(),
        queueFamilyProperties.end(),
        [](vk::QueueFamilyProperties const& qfp) { return qfp.queueFlags & vk::QueueFlagBits::eGraphics; }));

    // create a device
    float queuePriority = 0.0f;
    vk::DeviceQueueCreateInfo deviceQueueCreateInfo({}, static_cast<uint32_t>(graphicsQueueFamilyIndex), 1, &queuePriority);
    vk::UniqueDevice device = physicalDevices[0].createDeviceUnique(vk::DeviceCreateInfo({}, 1, &deviceQueueCreateInfo, 0, nullptr));

    /* VULKAN_HPP_KEY_START */

    // create a DescriptorSetLayout
    vk::DescriptorSetLayoutBinding descriptorSetLayoutBinding(0, vk::DescriptorType::eUniformBuffer, 1, vk::ShaderStageFlagBits::eVertex);
    vk::UniqueDescriptorSetLayout descriptorSetLayout = device->createDescriptorSetLayoutUnique(vk::DescriptorSetLayoutCreateInfo(vk::DescriptorSetLayoutCreateFlags(), 1, &descriptorSetLayoutBinding));

    // create a PipelineLayout using that DescriptorSetLayout
    vk::UniquePipelineLayout pipelineLayout = device->createPipelineLayoutUnique(vk::PipelineLayoutCreateInfo(vk::PipelineLayoutCreateFlags(), 1, &descriptorSetLayout.get()));

    // Note: No need to explicitly destroy the layouts, as the corresponding destroy function is
    // called by the destructor of the UniqueDescriptorSetLayout or UniquePipelineLayout, respectively, 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;
  }
  catch (...)
  {
    std::cout << "unknown error\n";
    exit(-1);
  }
  return 0;
}