// 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 : SecondaryCommandBuffer
//                     Draw several cubes using primary and secondary command buffers

#if defined( _MSC_VER )
// no need to ignore any warnings with MSVC
#elif defined( __clang__ )
#  pragma clang diagnostic ignored "-Wmissing-braces"
#elif defined( __GNUC__ )
// no need to ignore any warnings with GCC
#else
// unknow compiler... just ignore the warnings for yourselves ;)
#endif

#include "../../samples/utils/geometries.hpp"
#include "../../samples/utils/math.hpp"
#include "../utils/shaders.hpp"
#include "../utils/utils.hpp"
#include "SPIRV/GlslangToSpv.h"

#include <iostream>
#include <thread>

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

int main( int /*argc*/, char ** /*argv*/ )
{
  try
  {
    vk::raii::Context  context;
    vk::raii::Instance instance = vk::raii::su::makeInstance( context, AppName, EngineName, {}, vk::su::getInstanceExtensions() );
#if !defined( NDEBUG )
    vk::raii::DebugUtilsMessengerEXT debugUtilsMessenger( instance, vk::su::makeDebugUtilsMessengerCreateInfoEXT() );
#endif
    vk::raii::PhysicalDevice physicalDevice = vk::raii::PhysicalDevices( instance ).front();

    vk::raii::su::SurfaceData surfaceData( instance, AppName, vk::Extent2D( 500, 500 ) );

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

    vk::raii::CommandPool commandPool =
      vk::raii::CommandPool( device, { vk::CommandPoolCreateFlagBits::eResetCommandBuffer, graphicsAndPresentQueueFamilyIndex.first } );
    vk::raii::CommandBuffer commandBuffer = vk::raii::su::makeCommandBuffer( device, commandPool );

    vk::raii::Queue graphicsQueue( device, graphicsAndPresentQueueFamilyIndex.first, 0 );
    vk::raii::Queue presentQueue( device, graphicsAndPresentQueueFamilyIndex.second, 0 );

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

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

    vk::raii::su::BufferData uniformBufferData( physicalDevice, device, sizeof( glm::mat4x4 ), vk::BufferUsageFlagBits::eUniformBuffer );
    glm::mat4x4              mvpcMatrix = vk::su::createModelViewProjectionClipMatrix( surfaceData.extent );
    vk::raii::su::copyToDevice( uniformBufferData.deviceMemory, mvpcMatrix );

    vk::raii::DescriptorSetLayout descriptorSetLayout =
      vk::raii::su::makeDescriptorSetLayout( device,
                                             { { vk::DescriptorType::eUniformBuffer, 1, vk::ShaderStageFlagBits::eVertex },
                                               { vk::DescriptorType::eCombinedImageSampler, 1, vk::ShaderStageFlagBits::eFragment } } );
    vk::raii::PipelineLayout pipelineLayout( device, { {}, *descriptorSetLayout } );

    vk::Format           colorFormat = vk::su::pickSurfaceFormat( physicalDevice.getSurfaceFormatsKHR( *surfaceData.surface ) ).format;
    vk::raii::RenderPass renderPass =
      vk::raii::su::makeRenderPass( device, colorFormat, depthBufferData.format, vk::AttachmentLoadOp::eClear, vk::ImageLayout::eColorAttachmentOptimal );

    glslang::InitializeProcess();
    vk::raii::ShaderModule vertexShaderModule   = vk::raii::su::makeShaderModule( device, vk::ShaderStageFlagBits::eVertex, vertexShaderText_PT_T );
    vk::raii::ShaderModule fragmentShaderModule = vk::raii::su::makeShaderModule( device, vk::ShaderStageFlagBits::eFragment, fragmentShaderText_T_C );
    glslang::FinalizeProcess();

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

    vk::raii::su::BufferData vertexBufferData( physicalDevice, device, sizeof( texturedCubeData ), vk::BufferUsageFlagBits::eVertexBuffer );
    vk::raii::su::copyToDevice( vertexBufferData.deviceMemory, texturedCubeData, sizeof( texturedCubeData ) / sizeof( texturedCubeData[0] ) );

    vk::raii::PipelineCache pipelineCache( device, vk::PipelineCacheCreateInfo() );
    vk::raii::Pipeline      graphicsPipeline = vk::raii::su::makeGraphicsPipeline( device,
                                                                              pipelineCache,
                                                                              vertexShaderModule,
                                                                              nullptr,
                                                                              fragmentShaderModule,
                                                                              nullptr,
                                                                              sizeof( texturedCubeData[0] ),
                                                                              { { vk::Format::eR32G32B32A32Sfloat, 0 }, { vk::Format::eR32G32Sfloat, 16 } },
                                                                              vk::FrontFace::eClockwise,
                                                                              true,
                                                                              pipelineLayout,
                                                                              renderPass );

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

    vk::raii::su::TextureData greenTextureData( physicalDevice, device );
    greenTextureData.setImage( commandBuffer, vk::su::MonochromeImageGenerator( { 118, 185, 0 } ) );

    vk::raii::su::TextureData checkeredTextureData( physicalDevice, device );
    checkeredTextureData.setImage( commandBuffer, vk::su::CheckerboardImageGenerator() );

    // create two identical descriptor sets, each with a different texture but identical UBOs
    vk::raii::DescriptorPool descriptorPool =
      vk::raii::su::makeDescriptorPool( device, { { vk::DescriptorType::eUniformBuffer, 2 }, { vk::DescriptorType::eCombinedImageSampler, 2 } } );

    std::array<vk::DescriptorSetLayout, 2> layouts = { *descriptorSetLayout, *descriptorSetLayout };
    vk::DescriptorSetAllocateInfo          descriptorSetAllocateInfo( *descriptorPool, layouts );
    vk::raii::DescriptorSets               descriptorSets( device, descriptorSetAllocateInfo );
    assert( descriptorSets.size() == 2 );

    vk::raii::su::updateDescriptorSets(
      device, descriptorSets[0], { { vk::DescriptorType::eUniformBuffer, uniformBufferData.buffer, VK_WHOLE_SIZE, {} } }, greenTextureData );
    vk::raii::su::updateDescriptorSets(
      device, descriptorSets[1], { { vk::DescriptorType::eUniformBuffer, uniformBufferData.buffer, VK_WHOLE_SIZE, {} } }, checkeredTextureData );

    /* VULKAN_KEY_START */

    // create four secondary command buffers, for each quadrant of the screen
    vk::CommandBufferAllocateInfo commandBufferAllocateInfo( *commandPool, vk::CommandBufferLevel::eSecondary, 4 );
    vk::raii::CommandBuffers      secondaryCommandBuffers( device, commandBufferAllocateInfo );

    // Get the index of the next available swapchain image:
    vk::raii::Semaphore imageAcquiredSemaphore( device, vk::SemaphoreCreateInfo() );
    vk::Result          result;
    uint32_t            imageIndex;
    std::tie( result, imageIndex ) = swapChainData.swapChain.acquireNextImage( vk::su::FenceTimeout, *imageAcquiredSemaphore );
    assert( result == vk::Result::eSuccess );
    assert( imageIndex < swapChainData.images.size() );

    vk::raii::su::setImageLayout( commandBuffer,
                                  static_cast<vk::Image>( swapChainData.images[imageIndex] ),
                                  swapChainData.colorFormat,
                                  vk::ImageLayout::eUndefined,
                                  vk::ImageLayout::eColorAttachmentOptimal );

    const vk::DeviceSize offset = 0;
    vk::Viewport         viewport( 0.0f, 0.0f, 200.0f, 200.0f, 0.0f, 1.0f );
    vk::Rect2D           scissor( vk::Offset2D( 0, 0 ), vk::Extent2D( surfaceData.extent ) );

    // now we record four separate command buffers, one for each quadrant of the screen
    vk::CommandBufferInheritanceInfo commandBufferInheritanceInfo( *renderPass, 0, *framebuffers[imageIndex] );
    vk::CommandBufferBeginInfo       secondaryBeginInfo( vk::CommandBufferUsageFlagBits::eOneTimeSubmit | vk::CommandBufferUsageFlagBits::eRenderPassContinue,
                                                   &commandBufferInheritanceInfo );

    std::array<vk::CommandBuffer, 4> executeCommandBuffers;
    for ( int i = 0; i < 4; i++ )
    {
      viewport.x = 25.0f + 250.0f * ( i % 2 );
      viewport.y = 25.0f + 250.0f * ( i / 2 );

      secondaryCommandBuffers[i].begin( secondaryBeginInfo );
      secondaryCommandBuffers[i].bindPipeline( vk::PipelineBindPoint::eGraphics, *graphicsPipeline );
      secondaryCommandBuffers[i].bindDescriptorSets( vk::PipelineBindPoint::eGraphics, *pipelineLayout, 0, { *descriptorSets[i == 0 || i == 3] }, nullptr );
      secondaryCommandBuffers[i].bindVertexBuffers( 0, { *vertexBufferData.buffer }, offset );
      secondaryCommandBuffers[i].setViewport( 0, viewport );
      secondaryCommandBuffers[i].setScissor( 0, scissor );
      secondaryCommandBuffers[i].draw( 12 * 3, 1, 0, 0 );
      secondaryCommandBuffers[i].end();
      executeCommandBuffers[i] = *secondaryCommandBuffers[i];
    }

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

    vk::RenderPassBeginInfo renderPassBeginInfo( *renderPass, *framebuffers[imageIndex], vk::Rect2D( vk::Offset2D( 0, 0 ), surfaceData.extent ), clearValues );

    // specifying VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS means this render pass may ONLY call
    // vkCmdExecuteCommands
    commandBuffer.beginRenderPass( renderPassBeginInfo, vk::SubpassContents::eSecondaryCommandBuffers );
    commandBuffer.executeCommands( executeCommandBuffers );
    commandBuffer.endRenderPass();

    vk::ImageSubresourceRange imageSubresourceRange( vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1 );
    vk::ImageMemoryBarrier    prePresentBarrier( vk::AccessFlagBits::eColorAttachmentWrite,
                                              vk::AccessFlagBits::eMemoryRead,
                                              vk::ImageLayout::eColorAttachmentOptimal,
                                              vk::ImageLayout::ePresentSrcKHR,
                                              VK_QUEUE_FAMILY_IGNORED,
                                              VK_QUEUE_FAMILY_IGNORED,
                                              static_cast<vk::Image>( swapChainData.images[imageIndex] ),
                                              imageSubresourceRange );
    commandBuffer.pipelineBarrier(
      vk::PipelineStageFlagBits::eColorAttachmentOutput, vk::PipelineStageFlagBits::eBottomOfPipe, vk::DependencyFlags(), nullptr, nullptr, prePresentBarrier );
    commandBuffer.end();

    vk::raii::Fence drawFence( device, vk::FenceCreateInfo() );

    vk::PipelineStageFlags waitDestinationStageMask( vk::PipelineStageFlagBits::eColorAttachmentOutput );
    vk::SubmitInfo         submitInfo( *imageAcquiredSemaphore, waitDestinationStageMask, *commandBuffer );
    graphicsQueue.submit( submitInfo, *drawFence );

    while ( vk::Result::eTimeout == device.waitForFences( { *drawFence }, VK_TRUE, vk::su::FenceTimeout ) )
      ;

    result = presentQueue.presentKHR( vk::PresentInfoKHR( {}, *swapChainData.swapChain, imageIndex, {} ) );
    switch ( result )
    {
      case vk::Result::eSuccess: break;
      case vk::Result::eSuboptimalKHR: std::cout << "vk::Queue::presentKHR returned vk::Result::eSuboptimalKHR !\n"; break;
      default: assert( false );  // an unexpected result is returned !
    }
    std::this_thread::sleep_for( std::chrono::milliseconds( 1000 ) );

    /* VULKAN_KEY_END */

    device.waitIdle();
  }
  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;
}