// 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 : 09_InitDescriptorSet
//                     Initialize a descriptor set

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

#include <iostream>

#define GLM_FORCE_RADIANS
#pragma warning( disable : 4201 )  // disable warning C4201: nonstandard extension used: nameless struct/union; needed
                                   // to get glm/detail/type_vec?.hpp without warnings
#include <glm/gtc/matrix_transform.hpp>

static char const * AppName    = "09_InitDescriptorSet";
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();

    vk::UniqueDevice device = vk::su::createDevice(
      physicalDevice, vk::su::findGraphicsQueueFamilyIndex( physicalDevice.getQueueFamilyProperties() ) );

    vk::su::BufferData uniformBufferData(
      physicalDevice, device, sizeof( glm::mat4x4 ), vk::BufferUsageFlagBits::eUniformBuffer );
    vk::su::copyToDevice(
      device, uniformBufferData.deviceMemory, vk::su::createModelViewProjectionClipMatrix( vk::Extent2D( 0, 0 ) ) );

    vk::UniqueDescriptorSetLayout descriptorSetLayout = vk::su::createDescriptorSetLayout(
      device, { { vk::DescriptorType::eUniformBuffer, 1, vk::ShaderStageFlagBits::eVertex } } );

    /* VULKAN_HPP_KEY_START */

    // create a descriptor pool
    vk::DescriptorPoolSize   poolSize( vk::DescriptorType::eUniformBuffer, 1 );
    vk::UniqueDescriptorPool descriptorPool = device->createDescriptorPoolUnique(
      vk::DescriptorPoolCreateInfo( vk::DescriptorPoolCreateFlagBits::eFreeDescriptorSet, 1, poolSize ) );

    // allocate a descriptor set
    vk::UniqueDescriptorSet descriptorSet = std::move(
      device->allocateDescriptorSetsUnique( vk::DescriptorSetAllocateInfo( *descriptorPool, *descriptorSetLayout ) )
        .front() );

    vk::DescriptorBufferInfo descriptorBufferInfo( uniformBufferData.buffer.get(), 0, sizeof( glm::mat4x4 ) );
    device->updateDescriptorSets(
      vk::WriteDescriptorSet( descriptorSet.get(), 0, 0, vk::DescriptorType::eUniformBuffer, {}, descriptorBufferInfo ),
      {} );

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