// 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 : 14_InitPipeline
//                     Initialize graphics pipeline

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

#include <iostream>

static char const * AppName    = "14_InitPipeline";
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( 500, 500 ) );

    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::UniqueRenderPass renderPass = vk::su::createRenderPass(
      device,
      vk::su::pickSurfaceFormat( physicalDevice.getSurfaceFormatsKHR( surfaceData.surface.get() ) ).format,
      vk::Format::eD16Unorm );

    vk::UniqueDescriptorSetLayout descriptorSetLayout = vk::su::createDescriptorSetLayout(
      device, { { vk::DescriptorType::eUniformBuffer, 1, vk::ShaderStageFlagBits::eVertex } } );
    vk::UniquePipelineLayout pipelineLayout = device->createPipelineLayoutUnique(
      vk::PipelineLayoutCreateInfo( vk::PipelineLayoutCreateFlags(), *descriptorSetLayout ) );

    glslang::InitializeProcess();
    vk::UniqueShaderModule vertexShaderModule =
      vk::su::createShaderModule( device, vk::ShaderStageFlagBits::eVertex, vertexShaderText_PC_C );
    vk::UniqueShaderModule fragmentShaderModule =
      vk::su::createShaderModule( device, vk::ShaderStageFlagBits::eFragment, fragmentShaderText_C_C );
    glslang::FinalizeProcess();

    /* VULKAN_KEY_START */

    std::array<vk::PipelineShaderStageCreateInfo, 2> pipelineShaderStageCreateInfos = {
      vk::PipelineShaderStageCreateInfo(
        vk::PipelineShaderStageCreateFlags(), vk::ShaderStageFlagBits::eVertex, vertexShaderModule.get(), "main" ),
      vk::PipelineShaderStageCreateInfo(
        vk::PipelineShaderStageCreateFlags(), vk::ShaderStageFlagBits::eFragment, fragmentShaderModule.get(), "main" )
    };

    vk::VertexInputBindingDescription                  vertexInputBindingDescription( 0, sizeof( coloredCubeData[0] ) );
    std::array<vk::VertexInputAttributeDescription, 2> vertexInputAttributeDescriptions = {
      vk::VertexInputAttributeDescription( 0, 0, vk::Format::eR32G32B32A32Sfloat, 0 ),
      vk::VertexInputAttributeDescription( 1, 0, vk::Format::eR32G32B32A32Sfloat, 16 )
    };
    vk::PipelineVertexInputStateCreateInfo pipelineVertexInputStateCreateInfo(
      vk::PipelineVertexInputStateCreateFlags(),  // flags
      vertexInputBindingDescription,              // vertexBindingDescriptions
      vertexInputAttributeDescriptions            // vertexAttributeDescriptions
    );

    vk::PipelineInputAssemblyStateCreateInfo pipelineInputAssemblyStateCreateInfo(
      vk::PipelineInputAssemblyStateCreateFlags(), vk::PrimitiveTopology::eTriangleList );

    vk::PipelineViewportStateCreateInfo pipelineViewportStateCreateInfo(
      vk::PipelineViewportStateCreateFlags(), 1, nullptr, 1, nullptr );

    vk::PipelineRasterizationStateCreateInfo pipelineRasterizationStateCreateInfo(
      vk::PipelineRasterizationStateCreateFlags(),  // flags
      false,                                        // depthClampEnable
      false,                                        // rasterizerDiscardEnable
      vk::PolygonMode::eFill,                       // polygonMode
      vk::CullModeFlagBits::eBack,                  // cullMode
      vk::FrontFace::eClockwise,                    // frontFace
      false,                                        // depthBiasEnable
      0.0f,                                         // depthBiasConstantFactor
      0.0f,                                         // depthBiasClamp
      0.0f,                                         // depthBiasSlopeFactor
      1.0f                                          // lineWidth
    );

    vk::PipelineMultisampleStateCreateInfo pipelineMultisampleStateCreateInfo(
      vk::PipelineMultisampleStateCreateFlags(),  // flags
      vk::SampleCountFlagBits::e1                 // rasterizationSamples
                                                  // other values can be default
    );

    vk::StencilOpState stencilOpState(
      vk::StencilOp::eKeep, vk::StencilOp::eKeep, vk::StencilOp::eKeep, vk::CompareOp::eAlways );
    vk::PipelineDepthStencilStateCreateInfo pipelineDepthStencilStateCreateInfo(
      vk::PipelineDepthStencilStateCreateFlags(),  // flags
      true,                                        // depthTestEnable
      true,                                        // depthWriteEnable
      vk::CompareOp::eLessOrEqual,                 // depthCompareOp
      false,                                       // depthBoundTestEnable
      false,                                       // stencilTestEnable
      stencilOpState,                              // front
      stencilOpState                               // back
    );

    vk::ColorComponentFlags colorComponentFlags( vk::ColorComponentFlagBits::eR | vk::ColorComponentFlagBits::eG |
                                                 vk::ColorComponentFlagBits::eB | vk::ColorComponentFlagBits::eA );
    vk::PipelineColorBlendAttachmentState pipelineColorBlendAttachmentState(
      false,                   // blendEnable
      vk::BlendFactor::eZero,  // srcColorBlendFactor
      vk::BlendFactor::eZero,  // dstColorBlendFactor
      vk::BlendOp::eAdd,       // colorBlendOp
      vk::BlendFactor::eZero,  // srcAlphaBlendFactor
      vk::BlendFactor::eZero,  // dstAlphaBlendFactor
      vk::BlendOp::eAdd,       // alphaBlendOp
      colorComponentFlags      // colorWriteMask
    );
    vk::PipelineColorBlendStateCreateInfo pipelineColorBlendStateCreateInfo(
      vk::PipelineColorBlendStateCreateFlags(),  // flags
      false,                                     // logicOpEnable
      vk::LogicOp::eNoOp,                        // logicOp
      pipelineColorBlendAttachmentState,         // attachments
      { { 1.0f, 1.0f, 1.0f, 1.0f } }             // blendConstants
    );

    std::array<vk::DynamicState, 2>    dynamicStates = { vk::DynamicState::eViewport, vk::DynamicState::eScissor };
    vk::PipelineDynamicStateCreateInfo pipelineDynamicStateCreateInfo( vk::PipelineDynamicStateCreateFlags(),
                                                                       dynamicStates );

    vk::GraphicsPipelineCreateInfo graphicsPipelineCreateInfo(
      vk::PipelineCreateFlags(),              // flags
      pipelineShaderStageCreateInfos,         // stages
      &pipelineVertexInputStateCreateInfo,    // pVertexInputState
      &pipelineInputAssemblyStateCreateInfo,  // pInputAssemblyState
      nullptr,                                // pTessellationState
      &pipelineViewportStateCreateInfo,       // pViewportState
      &pipelineRasterizationStateCreateInfo,  // pRasterizationState
      &pipelineMultisampleStateCreateInfo,    // pMultisampleState
      &pipelineDepthStencilStateCreateInfo,   // pDepthStencilState
      &pipelineColorBlendStateCreateInfo,     // pColorBlendState
      &pipelineDynamicStateCreateInfo,        // pDynamicState
      pipelineLayout.get(),                   // layout
      renderPass.get()                        // renderPass
    );

    vk::Result         result;
    vk::UniquePipeline pipeline;
    std::tie( result, pipeline ) =
      device->createGraphicsPipelineUnique( nullptr, graphicsPipelineCreateInfo ).asTuple();
    switch ( result )
    {
      case vk::Result::eSuccess: break;
      case vk::Result::ePipelineCompileRequiredEXT:
        // something meaningfull here
        break;
      default: assert( false );  // should never happen
    }

    /* 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;
}