// 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 : CopyBlitImage
//                     Draw a cube

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

#include <thread>

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

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

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

    vk::su::SurfaceData surfaceData( instance, AppName, vk::Extent2D( 640, 640 ) );

    vk::SurfaceCapabilitiesKHR surfaceCapabilities =
      physicalDevice.getSurfaceCapabilitiesKHR( surfaceData.surface.get() );
    if ( !( surfaceCapabilities.supportedUsageFlags & vk::ImageUsageFlagBits::eTransferDst ) )
    {
      std::cout << "Surface cannot be destination of blit - abort \n";
      exit( -1 );
    }

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

    vk::UniqueCommandPool   commandPool = vk::su::createCommandPool( device, graphicsAndPresentQueueFamilyIndex.first );
    vk::UniqueCommandBuffer commandBuffer = std::move( device
                                                         ->allocateCommandBuffersUnique( vk::CommandBufferAllocateInfo(
                                                           commandPool.get(), vk::CommandBufferLevel::ePrimary, 1 ) )
                                                         .front() );

    vk::Queue graphicsQueue = device->getQueue( graphicsAndPresentQueueFamilyIndex.first, 0 );
    vk::Queue presentQueue  = device->getQueue( graphicsAndPresentQueueFamilyIndex.second, 0 );

    vk::su::SwapChainData swapChainData( physicalDevice,
                                         device,
                                         *surfaceData.surface,
                                         surfaceData.extent,
                                         vk::ImageUsageFlagBits::eColorAttachment |
                                           vk::ImageUsageFlagBits::eTransferDst,
                                         vk::UniqueSwapchainKHR(),
                                         graphicsAndPresentQueueFamilyIndex.first,
                                         graphicsAndPresentQueueFamilyIndex.second );

    /* VULKAN_KEY_START */

    vk::FormatProperties formatProperties = physicalDevice.getFormatProperties( swapChainData.colorFormat );
    assert( ( formatProperties.linearTilingFeatures & vk::FormatFeatureFlagBits::eBlitSrc ) &&
            "Format cannot be used as transfer source" );

    vk::UniqueSemaphore imageAcquiredSemaphore = device->createSemaphoreUnique( vk::SemaphoreCreateInfo() );

    // Get the index of the next available swapchain image:
    vk::ResultValue<uint32_t> nextImage = device->acquireNextImageKHR(
      swapChainData.swapChain.get(), vk::su::FenceTimeout, imageAcquiredSemaphore.get(), nullptr );
    assert( nextImage.result == vk::Result::eSuccess );
    assert( nextImage.value < swapChainData.images.size() );
    uint32_t currentBuffer = nextImage.value;

    commandBuffer->begin( vk::CommandBufferBeginInfo() );
    vk::su::setImageLayout( commandBuffer,
                            swapChainData.images[currentBuffer],
                            swapChainData.colorFormat,
                            vk::ImageLayout::eUndefined,
                            vk::ImageLayout::eTransferDstOptimal );

    // Create an image, map it, and write some values to the image
    vk::ImageCreateInfo imageCreateInfo( vk::ImageCreateFlags(),
                                         vk::ImageType::e2D,
                                         swapChainData.colorFormat,
                                         vk::Extent3D( surfaceData.extent, 1 ),
                                         1,
                                         1,
                                         vk::SampleCountFlagBits::e1,
                                         vk::ImageTiling::eLinear,
                                         vk::ImageUsageFlagBits::eTransferSrc );
    vk::UniqueImage     blitSourceImage = device->createImageUnique( imageCreateInfo );

    vk::PhysicalDeviceMemoryProperties memoryProperties   = physicalDevice.getMemoryProperties();
    vk::MemoryRequirements             memoryRequirements = device->getImageMemoryRequirements( blitSourceImage.get() );
    uint32_t                           memoryTypeIndex    = vk::su::findMemoryType(
      memoryProperties, memoryRequirements.memoryTypeBits, vk::MemoryPropertyFlagBits::eHostVisible );

    vk::UniqueDeviceMemory deviceMemory =
      device->allocateMemoryUnique( vk::MemoryAllocateInfo( memoryRequirements.size, memoryTypeIndex ) );
    device->bindImageMemory( blitSourceImage.get(), deviceMemory.get(), 0 );

    vk::su::setImageLayout( commandBuffer,
                            blitSourceImage.get(),
                            swapChainData.colorFormat,
                            vk::ImageLayout::eUndefined,
                            vk::ImageLayout::eGeneral );

    commandBuffer->end();

    /* Queue the command buffer for execution */
    vk::UniqueFence        commandFence = device->createFenceUnique( {} );
    vk::PipelineStageFlags pipeStageFlags( vk::PipelineStageFlagBits::eColorAttachmentOutput );
    graphicsQueue.submit( vk::SubmitInfo( *imageAcquiredSemaphore, pipeStageFlags, *commandBuffer ),
                          commandFence.get() );

    /* Make sure command buffer is finished before mapping */
    while ( device->waitForFences( commandFence.get(), true, vk::su::FenceTimeout ) == vk::Result::eTimeout )
      ;

    unsigned char * pImageMemory =
      static_cast<unsigned char *>( device->mapMemory( deviceMemory.get(), 0, memoryRequirements.size ) );

    // Checkerboard of 8x8 pixel squares
    for ( uint32_t row = 0; row < surfaceData.extent.height; row++ )
    {
      for ( uint32_t col = 0; col < surfaceData.extent.width; col++ )
      {
        unsigned char rgb = ( ( ( row & 0x8 ) == 0 ) ^ ( ( col & 0x8 ) == 0 ) ) * 255;
        pImageMemory[0]   = rgb;
        pImageMemory[1]   = rgb;
        pImageMemory[2]   = rgb;
        pImageMemory[3]   = 255;
        pImageMemory += 4;
      }
    }

    // Flush the mapped memory and then unmap it. Assume it isn't coherent since we didn't really confirm
    device->flushMappedMemoryRanges( vk::MappedMemoryRange( deviceMemory.get(), 0, memoryRequirements.size ) );
    device->unmapMemory( deviceMemory.get() );

    commandBuffer->reset( {} );
    commandBuffer->begin( vk::CommandBufferBeginInfo() );

    // Intend to blit from this image, set the layout accordingly
    vk::su::setImageLayout( commandBuffer,
                            blitSourceImage.get(),
                            swapChainData.colorFormat,
                            vk::ImageLayout::eGeneral,
                            vk::ImageLayout::eTransferSrcOptimal );

    vk::Image blitDestinationImage = swapChainData.images[currentBuffer];

    // Do a 32x32 blit to all of the dst image - should get big squares
    vk::ImageSubresourceLayers imageSubresourceLayers( vk::ImageAspectFlagBits::eColor, 0, 0, 1 );
    vk::ImageBlit              imageBlit(
      imageSubresourceLayers,
      { { vk::Offset3D( 0, 0, 0 ), vk::Offset3D( 32, 32, 1 ) } },
      imageSubresourceLayers,
      { { vk::Offset3D( 0, 0, 0 ), vk::Offset3D( surfaceData.extent.width, surfaceData.extent.height, 1 ) } } );
    commandBuffer->blitImage( blitSourceImage.get(),
                              vk::ImageLayout::eTransferSrcOptimal,
                              blitDestinationImage,
                              vk::ImageLayout::eTransferDstOptimal,
                              imageBlit,
                              vk::Filter::eLinear );

    // Use a barrier to make sure the blit is finished before the copy starts
    vk::ImageMemoryBarrier memoryBarrier( vk::AccessFlagBits::eTransferWrite,
                                          vk::AccessFlagBits::eMemoryRead,
                                          vk::ImageLayout::eTransferDstOptimal,
                                          vk::ImageLayout::eTransferDstOptimal,
                                          VK_QUEUE_FAMILY_IGNORED,
                                          VK_QUEUE_FAMILY_IGNORED,
                                          blitDestinationImage,
                                          vk::ImageSubresourceRange( vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1 ) );
    commandBuffer->pipelineBarrier( vk::PipelineStageFlagBits::eTransfer,
                                    vk::PipelineStageFlagBits::eTransfer,
                                    vk::DependencyFlags(),
                                    nullptr,
                                    nullptr,
                                    memoryBarrier );

    // Do a image copy to part of the dst image - checks should stay small
    vk::ImageCopy imageCopy( imageSubresourceLayers,
                             vk::Offset3D(),
                             imageSubresourceLayers,
                             vk::Offset3D( 256, 256, 0 ),
                             vk::Extent3D( 128, 128, 1 ) );
    commandBuffer->copyImage( blitSourceImage.get(),
                              vk::ImageLayout::eTransferSrcOptimal,
                              blitDestinationImage,
                              vk::ImageLayout::eTransferDstOptimal,
                              imageCopy );

    vk::ImageMemoryBarrier prePresentBarrier(
      vk::AccessFlagBits::eTransferWrite,
      vk::AccessFlagBits::eMemoryRead,
      vk::ImageLayout::eTransferDstOptimal,
      vk::ImageLayout::ePresentSrcKHR,
      VK_QUEUE_FAMILY_IGNORED,
      VK_QUEUE_FAMILY_IGNORED,
      swapChainData.images[currentBuffer],
      vk::ImageSubresourceRange( vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1 ) );
    commandBuffer->pipelineBarrier( vk::PipelineStageFlagBits::eTransfer,
                                    vk::PipelineStageFlagBits::eTopOfPipe,
                                    vk::DependencyFlags(),
                                    nullptr,
                                    nullptr,
                                    prePresentBarrier );
    commandBuffer->end();

    vk::UniqueFence drawFence = device->createFenceUnique( {} );
    graphicsQueue.submit( vk::SubmitInfo( {}, {}, *commandBuffer ), drawFence.get() );
    graphicsQueue.waitIdle();

    /* Make sure command buffer is finished before presenting */
    while ( device->waitForFences( drawFence.get(), true, vk::su::FenceTimeout ) == vk::Result::eTimeout )
      ;

    /* Now present the image in the window */
    vk::Result result =
      presentQueue.presentKHR( vk::PresentInfoKHR( {}, *swapChainData.swapChain, currentBuffer, {} ) );
    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 */
  }
  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;
}