// 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 : InitTexture
//                     Initialize texture

#if defined( _MSC_VER )
// no need to ignore any warnings with MSVC
#elif defined( __clang__ )
#  pragma clang diagnostic ignored "-Wunused-variable"
#elif defined( __GNUC__ )
#  pragma GCC diagnostic ignored "-Wunused-but-set-variable"
#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 "vulkan/vulkan_raii.hpp"

#include <iostream>

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

int main( int /*argc*/, char ** /*argv*/ )
{
  try
  {
    std::unique_ptr<vk::raii::Context>  context = vk::raii::su::make_unique<vk::raii::Context>();
    std::unique_ptr<vk::raii::Instance> instance =
      vk::raii::su::makeUniqueInstance( *context, AppName, EngineName, {}, vk::su::getInstanceExtensions() );
#if !defined( NDEBUG )
    std::unique_ptr<vk::raii::DebugUtilsMessengerEXT> debugUtilsMessenger =
      vk::raii::su::makeUniqueDebugUtilsMessengerEXT( *instance );
#endif
    std::unique_ptr<vk::raii::PhysicalDevice> physicalDevice = vk::raii::su::makeUniquePhysicalDevice( *instance );

    vk::raii::su::SurfaceData surfaceData( *instance, AppName, vk::Extent2D( 50, 50 ) );

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

    std::unique_ptr<vk::raii::CommandPool> commandPool =
      vk::raii::su::makeUniqueCommandPool( *device, graphicsAndPresentQueueFamilyIndex.first );
    std::unique_ptr<vk::raii::CommandBuffer> commandBuffer =
      vk::raii::su::makeUniqueCommandBuffer( *device, *commandPool );

    std::unique_ptr<vk::raii::Queue> graphicsQueue =
      vk::raii::su::make_unique<vk::raii::Queue>( *device, graphicsAndPresentQueueFamilyIndex.first, 0 );
    std::unique_ptr<vk::raii::Queue> presentQueue =
      vk::raii::su::make_unique<vk::raii::Queue>( *device, graphicsAndPresentQueueFamilyIndex.second, 0 );

    /* VULKAN_KEY_START */

    vk::Format           format           = vk::Format::eR8G8B8A8Unorm;
    vk::FormatProperties formatProperties = physicalDevice->getFormatProperties( format );

    // See if we can use a linear tiled image for a texture, if not, we will need a staging buffer for the texture data
    bool needsStaging = !( formatProperties.linearTilingFeatures & vk::FormatFeatureFlagBits::eSampledImage );

    vk::ImageCreateInfo imageCreateInfo(
      {},
      vk::ImageType::e2D,
      format,
      vk::Extent3D( surfaceData.extent, 1 ),
      1,
      1,
      vk::SampleCountFlagBits::e1,
      needsStaging ? vk::ImageTiling::eOptimal : vk::ImageTiling::eLinear,
      vk::ImageUsageFlagBits::eSampled |
        ( needsStaging ? vk::ImageUsageFlagBits::eTransferDst : vk::ImageUsageFlagBits() ),
      vk::SharingMode::eExclusive,
      {},
      needsStaging ? vk::ImageLayout::eUndefined : vk::ImageLayout::ePreinitialized );
    std::unique_ptr<vk::raii::Image> image = vk::raii::su::make_unique<vk::raii::Image>( *device, imageCreateInfo );

    vk::MemoryRequirements memoryRequirements = image->getMemoryRequirements();
    uint32_t               memoryTypeIndex    = vk::su::findMemoryType(
      physicalDevice->getMemoryProperties(),
      memoryRequirements.memoryTypeBits,
      needsStaging ? vk::MemoryPropertyFlags()
                                    : ( vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent ) );

    // allocate memory
    vk::MemoryAllocateInfo                  memoryAllocateInfo( memoryRequirements.size, memoryTypeIndex );
    std::unique_ptr<vk::raii::DeviceMemory> imageMemory =
      vk::raii::su::make_unique<vk::raii::DeviceMemory>( *device, memoryAllocateInfo );

    // bind memory
    image->bindMemory( **imageMemory, 0 );

    std::unique_ptr<vk::raii::Buffer>       textureBuffer;
    std::unique_ptr<vk::raii::DeviceMemory> textureBufferMemory;
    if ( needsStaging )
    {
      // Need a staging buffer to map and copy texture into
      vk::BufferCreateInfo bufferCreateInfo(
        {}, surfaceData.extent.width * surfaceData.extent.height * 4, vk::BufferUsageFlagBits::eTransferSrc );
      textureBuffer = vk::raii::su::make_unique<vk::raii::Buffer>( *device, bufferCreateInfo );

      memoryRequirements = textureBuffer->getMemoryRequirements();
      memoryTypeIndex =
        vk::su::findMemoryType( physicalDevice->getMemoryProperties(),
                                memoryRequirements.memoryTypeBits,
                                vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent );

      // allocate memory
      memoryAllocateInfo  = vk::MemoryAllocateInfo( memoryRequirements.size, memoryTypeIndex );
      textureBufferMemory = vk::raii::su::make_unique<vk::raii::DeviceMemory>( *device, memoryAllocateInfo );

      // bind memory
      textureBuffer->bindMemory( **textureBufferMemory, 0 );
    }
    else
    {
      vk::SubresourceLayout subresourceLayout =
        image->getSubresourceLayout( vk::ImageSubresource( vk::ImageAspectFlagBits::eColor ) );
    }

    void * data = needsStaging ? textureBufferMemory->mapMemory( 0, memoryRequirements.size, vk::MemoryMapFlags() )
                               : imageMemory->mapMemory( 0, memoryRequirements.size, vk::MemoryMapFlags() );

    // Checkerboard of 16x16 pixel squares
    unsigned char * pImageMemory = static_cast<unsigned char *>( data );
    for ( uint32_t row = 0; row < surfaceData.extent.height; row++ )
    {
      for ( uint32_t col = 0; col < surfaceData.extent.width; col++ )
      {
        unsigned char rgb = ( ( ( row & 0x10 ) == 0 ) ^ ( ( col & 0x10 ) == 0 ) ) * 255;
        pImageMemory[0]   = rgb;
        pImageMemory[1]   = rgb;
        pImageMemory[2]   = rgb;
        pImageMemory[3]   = 255;
        pImageMemory += 4;
      }
    }

    needsStaging ? textureBufferMemory->unmapMemory() : imageMemory->unmapMemory();

    commandBuffer->begin( vk::CommandBufferBeginInfo() );
    if ( needsStaging )
    {
      // Since we're going to blit to the texture image, set its layout to eTransferDstOptimal
      vk::raii::su::setImageLayout(
        *commandBuffer, **image, format, vk::ImageLayout::eUndefined, vk::ImageLayout::eTransferDstOptimal );
      vk::BufferImageCopy copyRegion( 0,
                                      surfaceData.extent.width,
                                      surfaceData.extent.height,
                                      vk::ImageSubresourceLayers( vk::ImageAspectFlagBits::eColor, 0, 0, 1 ),
                                      vk::Offset3D( 0, 0, 0 ),
                                      vk::Extent3D( surfaceData.extent, 1 ) );
      commandBuffer->copyBufferToImage( **textureBuffer, **image, vk::ImageLayout::eTransferDstOptimal, copyRegion );
      // Set the layout for the texture image from eTransferDstOptimal to SHADER_READ_ONLY
      vk::raii::su::setImageLayout( *commandBuffer,
                                    **image,
                                    format,
                                    vk::ImageLayout::eTransferDstOptimal,
                                    vk::ImageLayout::eShaderReadOnlyOptimal );
    }
    else
    {
      // If we can use the linear tiled image as a texture, just do it
      vk::raii::su::setImageLayout(
        *commandBuffer, **image, format, vk::ImageLayout::ePreinitialized, vk::ImageLayout::eShaderReadOnlyOptimal );
    }

    commandBuffer->end();
    vk::raii::su::submitAndWait( *device, *graphicsQueue, *commandBuffer );

    vk::SamplerCreateInfo              samplerCreateInfo( {},
                                             vk::Filter::eNearest,
                                             vk::Filter::eNearest,
                                             vk::SamplerMipmapMode::eNearest,
                                             vk::SamplerAddressMode::eClampToEdge,
                                             vk::SamplerAddressMode::eClampToEdge,
                                             vk::SamplerAddressMode::eClampToEdge,
                                             0.0f,
                                             false,
                                             1.0f,
                                             false,
                                             vk::CompareOp::eNever,
                                             0.0f,
                                             0.0f,
                                             vk::BorderColor::eFloatOpaqueWhite );
    std::unique_ptr<vk::raii::Sampler> sampler = vk::raii::su::make_unique<vk::raii::Sampler>( *device, samplerCreateInfo );

    vk::ComponentMapping componentMapping(
      vk::ComponentSwizzle::eR, vk::ComponentSwizzle::eG, vk::ComponentSwizzle::eB, vk::ComponentSwizzle::eA );
    vk::ImageSubresourceRange imageSubresourceRange( vk::ImageAspectFlagBits::eColor, 0, 1, 0, 1 );
    vk::ImageViewCreateInfo   imageViewCreateInfo(
      {}, **image, vk::ImageViewType::e2D, format, componentMapping, imageSubresourceRange );
    std::unique_ptr<vk::raii::ImageView> imageView =
      vk::raii::su::make_unique<vk::raii::ImageView>( *device, imageViewCreateInfo );

    /* 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;
}
