// Copyright(c) 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 : 13_InitVertexBuffer
//                     Initialize vertex buffer

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

#include <iostream>

static char const * AppName    = "13_InitVertexBuffer";
static char const * EngineName = "Vulkan.hpp";

int main( int /*argc*/, char ** /*argv*/ )
{
  try
  {
    vk::Instance instance = vk::su::createInstance( AppName, EngineName, {}, vk::su::getInstanceExtensions() );
#if !defined( NDEBUG )
    vk::DebugUtilsMessengerEXT debugUtilsMessenger =
      instance.createDebugUtilsMessengerEXT( vk::su::makeDebugUtilsMessengerCreateInfoEXT() );
#endif

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

    vk::su::SurfaceData surfaceData( instance, AppName, vk::Extent2D( 64, 64 ) );

    std::pair<uint32_t, uint32_t> graphicsAndPresentQueueFamilyIndex =
      vk::su::findGraphicsAndPresentQueueFamilyIndex( physicalDevice, surfaceData.surface );
    vk::Device device =
      vk::su::createDevice( physicalDevice, graphicsAndPresentQueueFamilyIndex.first, vk::su::getDeviceExtensions() );

    vk::CommandPool   commandPool = vk::su::createCommandPool( device, graphicsAndPresentQueueFamilyIndex.first );
    vk::CommandBuffer commandBuffer =
      device.allocateCommandBuffers( vk::CommandBufferAllocateInfo( commandPool, vk::CommandBufferLevel::ePrimary, 1 ) )
        .front();

    vk::Queue graphicsQueue = device.getQueue( graphicsAndPresentQueueFamilyIndex.first, 0 );

    vk::su::SwapChainData swapChainData( physicalDevice,
                                         device,
                                         surfaceData.surface,
                                         surfaceData.extent,
                                         vk::ImageUsageFlagBits::eColorAttachment |
                                           vk::ImageUsageFlagBits::eTransferSrc,
                                         {},
                                         graphicsAndPresentQueueFamilyIndex.first,
                                         graphicsAndPresentQueueFamilyIndex.second );

    vk::su::DepthBufferData depthBufferData( physicalDevice, device, vk::Format::eD16Unorm, surfaceData.extent );

    vk::RenderPass renderPass = vk::su::createRenderPass( device, swapChainData.colorFormat, depthBufferData.format );

    std::vector<vk::Framebuffer> framebuffers = vk::su::createFramebuffers(
      device, renderPass, swapChainData.imageViews, depthBufferData.imageView, surfaceData.extent );

    /* VULKAN_KEY_START */

    // create a vertex buffer for some vertex and color data
    vk::Buffer vertexBuffer = device.createBuffer( vk::BufferCreateInfo(
      vk::BufferCreateFlags(), sizeof( coloredCubeData ), vk::BufferUsageFlagBits::eVertexBuffer ) );

    // allocate device memory for that buffer
    vk::MemoryRequirements memoryRequirements = device.getBufferMemoryRequirements( vertexBuffer );
    uint32_t               memoryTypeIndex =
      vk::su::findMemoryType( physicalDevice.getMemoryProperties(),
                              memoryRequirements.memoryTypeBits,
                              vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent );
    vk::DeviceMemory deviceMemory =
      device.allocateMemory( vk::MemoryAllocateInfo( memoryRequirements.size, memoryTypeIndex ) );

    // copy the vertex and color data into that device memory
    uint8_t * pData = static_cast<uint8_t *>( device.mapMemory( deviceMemory, 0, memoryRequirements.size ) );
    memcpy( pData, coloredCubeData, sizeof( coloredCubeData ) );
    device.unmapMemory( deviceMemory );

    // and bind the device memory to the vertex buffer
    device.bindBufferMemory( vertexBuffer, deviceMemory, 0 );

    vk::Semaphore imageAcquiredSemaphore =
      device.createSemaphore( vk::SemaphoreCreateInfo( vk::SemaphoreCreateFlags() ) );
    vk::ResultValue<uint32_t> currentBuffer = device.acquireNextImageKHR(
      swapChainData.swapChain, vk::su::FenceTimeout, imageAcquiredSemaphore, nullptr );
    assert( currentBuffer.result == vk::Result::eSuccess );
    assert( currentBuffer.value < framebuffers.size() );

    std::array<vk::ClearValue, 2> clearValues;
    clearValues[0].color        = vk::ClearColorValue( std::array<float, 4>( { { 0.2f, 0.2f, 0.2f, 0.2f } } ) );
    clearValues[1].depthStencil = vk::ClearDepthStencilValue( 1.0f, 0 );

    commandBuffer.begin( vk::CommandBufferBeginInfo( vk::CommandBufferUsageFlags() ) );

    vk::RenderPassBeginInfo renderPassBeginInfo( renderPass,
                                                 framebuffers[currentBuffer.value],
                                                 vk::Rect2D( vk::Offset2D( 0, 0 ), surfaceData.extent ),
                                                 clearValues );
    commandBuffer.beginRenderPass( renderPassBeginInfo, vk::SubpassContents::eInline );

    commandBuffer.bindVertexBuffers( 0, vertexBuffer, { 0 } );

    commandBuffer.endRenderPass();
    commandBuffer.end();
    vk::su::submitAndWait( device, graphicsQueue, commandBuffer );

    device.destroySemaphore( imageAcquiredSemaphore );
    device.freeMemory( deviceMemory );
    device.destroyBuffer( vertexBuffer );

    /* VULKAN_KEY_END */

    swapChainData.clear( device );
    depthBufferData.clear( device );
    for ( auto const & framebuffer : framebuffers )
    {
      device.destroyFramebuffer( framebuffer );
    }
    device.destroyRenderPass( renderPass );
    device.freeCommandBuffers( commandPool, commandBuffer );
    device.destroyCommandPool( commandPool );
    device.destroy();
    instance.destroySurfaceKHR( surfaceData.surface );
    instance.destroyDebugUtilsMessengerEXT( debugUtilsMessenger );
    instance.destroy();
  }
  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;
}