Tutorial04.cpp

////////////////////////////////////////////////////////////////////////////////
// Copyright 2017 Intel Corporation
//
// 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.
////////////////////////////////////////////////////////////////////////////////

#include <cstddef>
#include "Tutorial04.h"
#include "VulkanFunctions.h"

namespace ApiWithoutSecrets {

  Tutorial04::Tutorial04() {
  }

  bool Tutorial04::CreateRenderPass() {
    VkAttachmentDescription attachment_descriptions[] = {
      {
        0,                                              // VkAttachmentDescriptionFlags   flags
        GetSwapChain().Format,                          // VkFormat                       format
        VK_SAMPLE_COUNT_1_BIT,                          // VkSampleCountFlagBits          samples
        VK_ATTACHMENT_LOAD_OP_CLEAR,                    // VkAttachmentLoadOp             loadOp
        VK_ATTACHMENT_STORE_OP_STORE,                   // VkAttachmentStoreOp            storeOp
        VK_ATTACHMENT_LOAD_OP_DONT_CARE,                // VkAttachmentLoadOp             stencilLoadOp
        VK_ATTACHMENT_STORE_OP_DONT_CARE,               // VkAttachmentStoreOp            stencilStoreOp
        VK_IMAGE_LAYOUT_UNDEFINED,                      // VkImageLayout                  initialLayout;
        VK_IMAGE_LAYOUT_PRESENT_SRC_KHR                 // VkImageLayout                  finalLayout
      }
    };

    VkAttachmentReference color_attachment_references[] = {
      {
        0,                                              // uint32_t                       attachment
        VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL        // VkImageLayout                  layout
      }
    };

    VkSubpassDescription subpass_descriptions[] = {
      {
        0,                                              // VkSubpassDescriptionFlags      flags
        VK_PIPELINE_BIND_POINT_GRAPHICS,                // VkPipelineBindPoint            pipelineBindPoint
        0,                                              // uint32_t                       inputAttachmentCount
        nullptr,                                        // const VkAttachmentReference   *pInputAttachments
        1,                                              // uint32_t                       colorAttachmentCount
        color_attachment_references,                    // const VkAttachmentReference   *pColorAttachments
        nullptr,                                        // const VkAttachmentReference   *pResolveAttachments
        nullptr,                                        // const VkAttachmentReference   *pDepthStencilAttachment
        0,                                              // uint32_t                       preserveAttachmentCount
        nullptr                                         // const uint32_t*                pPreserveAttachments
      }
    };

    std::vector<VkSubpassDependency> dependencies = {
      {
        VK_SUBPASS_EXTERNAL,                            // uint32_t                       srcSubpass
        0,                                              // uint32_t                       dstSubpass
        VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,           // VkPipelineStageFlags           srcStageMask
        VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT,  // VkPipelineStageFlags           dstStageMask
        VK_ACCESS_MEMORY_READ_BIT,                      // VkAccessFlags                  srcAccessMask
        VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,           // VkAccessFlags                  dstAccessMask
        VK_DEPENDENCY_BY_REGION_BIT                     // VkDependencyFlags              dependencyFlags
      },
      {
        0,                                              // uint32_t                       srcSubpass
        VK_SUBPASS_EXTERNAL,                            // uint32_t                       dstSubpass
        VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT,  // VkPipelineStageFlags           srcStageMask
        VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT,           // VkPipelineStageFlags           dstStageMask
        VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT,           // VkAccessFlags                  srcAccessMask
        VK_ACCESS_MEMORY_READ_BIT,                      // VkAccessFlags                  dstAccessMask
        VK_DEPENDENCY_BY_REGION_BIT                     // VkDependencyFlags              dependencyFlags
      }
    };

    VkRenderPassCreateInfo render_pass_create_info = {
      VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,        // VkStructureType                sType
      nullptr,                                          // const void                    *pNext
      0,                                                // VkRenderPassCreateFlags        flags
      1,                                                // uint32_t                       attachmentCount
      attachment_descriptions,                          // const VkAttachmentDescription *pAttachments
      1,                                                // uint32_t                       subpassCount
      subpass_descriptions,                             // const VkSubpassDescription    *pSubpasses
      static_cast<uint32_t>(dependencies.size()),       // uint32_t                       dependencyCount
      dependencies.data()                               // const VkSubpassDependency     *pDependencies
    };

    if( vkCreateRenderPass( GetDevice(), &render_pass_create_info, nullptr, &Vulkan.RenderPass ) != VK_SUCCESS ) {
      std::cout << "Could not create render pass!" << std::endl;
      return false;
    }

    return true;
  }

  Tools::AutoDeleter<VkShaderModule, PFN_vkDestroyShaderModule> Tutorial04::CreateShaderModule( const char* filename ) {
    const std::vector<char> code = Tools::GetBinaryFileContents( filename );
    if( code.size() == 0 ) {
      return Tools::AutoDeleter<VkShaderModule, PFN_vkDestroyShaderModule>();
    }

    VkShaderModuleCreateInfo shader_module_create_info = {
      VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO,    // VkStructureType                sType
      nullptr,                                        // const void                    *pNext
      0,                                              // VkShaderModuleCreateFlags      flags
      code.size(),                                    // size_t                         codeSize
      reinterpret_cast<const uint32_t*>(code.data())  // const uint32_t                *pCode
    };

    VkShaderModule shader_module;
    if( vkCreateShaderModule( GetDevice(), &shader_module_create_info, nullptr, &shader_module ) != VK_SUCCESS ) {
      std::cout << "Could not create shader module from a \"" << filename << "\" file!" << std::endl;
      return Tools::AutoDeleter<VkShaderModule, PFN_vkDestroyShaderModule>();
    }

    return Tools::AutoDeleter<VkShaderModule, PFN_vkDestroyShaderModule>( shader_module, vkDestroyShaderModule, GetDevice() );
  }

  Tools::AutoDeleter<VkPipelineLayout, PFN_vkDestroyPipelineLayout> Tutorial04::CreatePipelineLayout() {
    VkPipelineLayoutCreateInfo layout_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,  // VkStructureType                sType
      nullptr,                                        // const void                    *pNext
      0,                                              // VkPipelineLayoutCreateFlags    flags
      0,                                              // uint32_t                       setLayoutCount
      nullptr,                                        // const VkDescriptorSetLayout   *pSetLayouts
      0,                                              // uint32_t                       pushConstantRangeCount
      nullptr                                         // const VkPushConstantRange     *pPushConstantRanges
    };

    VkPipelineLayout pipeline_layout;
    if( vkCreatePipelineLayout( GetDevice(), &layout_create_info, nullptr, &pipeline_layout ) != VK_SUCCESS ) {
      std::cout << "Could not create pipeline layout!" << std::endl;
      return Tools::AutoDeleter<VkPipelineLayout, PFN_vkDestroyPipelineLayout>();
    }

    return Tools::AutoDeleter<VkPipelineLayout, PFN_vkDestroyPipelineLayout>( pipeline_layout, vkDestroyPipelineLayout, GetDevice() );
  }

  bool Tutorial04::CreatePipeline() {
    Tools::AutoDeleter<VkShaderModule, PFN_vkDestroyShaderModule> vertex_shader_module = CreateShaderModule( "Data/Tutorials/04/shader.vert.spv" );
    Tools::AutoDeleter<VkShaderModule, PFN_vkDestroyShaderModule> fragment_shader_module = CreateShaderModule( "Data/Tutorials/04/shader.frag.spv" );

    if( !vertex_shader_module || !fragment_shader_module ) {
      return false;
    }

    std::vector<VkPipelineShaderStageCreateInfo> shader_stage_create_infos = {
      // Vertex shader
      {
        VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,        // VkStructureType                                sType
        nullptr,                                                    // const void                                    *pNext
        0,                                                          // VkPipelineShaderStageCreateFlags               flags
        VK_SHADER_STAGE_VERTEX_BIT,                                 // VkShaderStageFlagBits                          stage
        vertex_shader_module.Get(),                                 // VkShaderModule                                 module
        "main",                                                     // const char                                    *pName
        nullptr                                                     // const VkSpecializationInfo                    *pSpecializationInfo
      },
      // Fragment shader
      {
        VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,        // VkStructureType                                sType
        nullptr,                                                    // const void                                    *pNext
        0,                                                          // VkPipelineShaderStageCreateFlags               flags
        VK_SHADER_STAGE_FRAGMENT_BIT,                               // VkShaderStageFlagBits                          stage
        fragment_shader_module.Get(),                               // VkShaderModule                                 module
        "main",                                                     // const char                                    *pName
        nullptr                                                     // const VkSpecializationInfo                    *pSpecializationInfo
      }
    };

    std::vector<VkVertexInputBindingDescription> vertex_binding_descriptions = {
      {
        0,                                                          // uint32_t                                       binding
        sizeof(VertexData),                                         // uint32_t                                       stride
        VK_VERTEX_INPUT_RATE_VERTEX                                 // VkVertexInputRate                              inputRate
      }
    };

    std::vector<VkVertexInputAttributeDescription> vertex_attribute_descriptions = {
      {
        0,                                                          // uint32_t                                       location
        vertex_binding_descriptions[0].binding,                     // uint32_t                                       binding
        VK_FORMAT_R32G32B32A32_SFLOAT,                              // VkFormat                                       format
        offsetof(struct VertexData, x)                              // uint32_t                                       offset
      },
      {
        1,                                                          // uint32_t                                       location
        vertex_binding_descriptions[0].binding,                     // uint32_t                                       binding
        VK_FORMAT_R32G32B32A32_SFLOAT,                              // VkFormat                                       format
        offsetof(struct VertexData, r)                              // uint32_t                                       offset
      }
    };

    VkPipelineVertexInputStateCreateInfo vertex_input_state_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,    // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineVertexInputStateCreateFlags          flags
      static_cast<uint32_t>(vertex_binding_descriptions.size()),    // uint32_t                                       vertexBindingDescriptionCount
      vertex_binding_descriptions.data(),                           // const VkVertexInputBindingDescription         *pVertexBindingDescriptions
      static_cast<uint32_t>(vertex_attribute_descriptions.size()),  // uint32_t                                       vertexAttributeDescriptionCount
      vertex_attribute_descriptions.data()                          // const VkVertexInputAttributeDescription       *pVertexAttributeDescriptions
    };

    VkPipelineInputAssemblyStateCreateInfo input_assembly_state_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO,  // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineInputAssemblyStateCreateFlags        flags
      VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP,                         // VkPrimitiveTopology                            topology
      VK_FALSE                                                      // VkBool32                                       primitiveRestartEnable
    };

    VkPipelineViewportStateCreateInfo viewport_state_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,        // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineViewportStateCreateFlags             flags
      1,                                                            // uint32_t                                       viewportCount
      nullptr,                                                      // const VkViewport                              *pViewports
      1,                                                            // uint32_t                                       scissorCount
      nullptr                                                       // const VkRect2D                                *pScissors
    };

    VkPipelineRasterizationStateCreateInfo rasterization_state_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO,   // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineRasterizationStateCreateFlags        flags
      VK_FALSE,                                                     // VkBool32                                       depthClampEnable
      VK_FALSE,                                                     // VkBool32                                       rasterizerDiscardEnable
      VK_POLYGON_MODE_FILL,                                         // VkPolygonMode                                  polygonMode
      VK_CULL_MODE_BACK_BIT,                                        // VkCullModeFlags                                cullMode
      VK_FRONT_FACE_COUNTER_CLOCKWISE,                              // VkFrontFace                                    frontFace
      VK_FALSE,                                                     // VkBool32                                       depthBiasEnable
      0.0f,                                                         // float                                          depthBiasConstantFactor
      0.0f,                                                         // float                                          depthBiasClamp
      0.0f,                                                         // float                                          depthBiasSlopeFactor
      1.0f                                                          // float                                          lineWidth
    };

    VkPipelineMultisampleStateCreateInfo multisample_state_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO,     // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineMultisampleStateCreateFlags          flags
      VK_SAMPLE_COUNT_1_BIT,                                        // VkSampleCountFlagBits                          rasterizationSamples
      VK_FALSE,                                                     // VkBool32                                       sampleShadingEnable
      1.0f,                                                         // float                                          minSampleShading
      nullptr,                                                      // const VkSampleMask                            *pSampleMask
      VK_FALSE,                                                     // VkBool32                                       alphaToCoverageEnable
      VK_FALSE                                                      // VkBool32                                       alphaToOneEnable
    };

    VkPipelineColorBlendAttachmentState color_blend_attachment_state = {
      VK_FALSE,                                                     // VkBool32                                       blendEnable
      VK_BLEND_FACTOR_ONE,                                          // VkBlendFactor                                  srcColorBlendFactor
      VK_BLEND_FACTOR_ZERO,                                         // VkBlendFactor                                  dstColorBlendFactor
      VK_BLEND_OP_ADD,                                              // VkBlendOp                                      colorBlendOp
      VK_BLEND_FACTOR_ONE,                                          // VkBlendFactor                                  srcAlphaBlendFactor
      VK_BLEND_FACTOR_ZERO,                                         // VkBlendFactor                                  dstAlphaBlendFactor
      VK_BLEND_OP_ADD,                                              // VkBlendOp                                      alphaBlendOp
      VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |         // VkColorComponentFlags                          colorWriteMask
      VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT
    };

    VkPipelineColorBlendStateCreateInfo color_blend_state_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,     // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineColorBlendStateCreateFlags           flags
      VK_FALSE,                                                     // VkBool32                                       logicOpEnable
      VK_LOGIC_OP_COPY,                                             // VkLogicOp                                      logicOp
      1,                                                            // uint32_t                                       attachmentCount
      &color_blend_attachment_state,                                // const VkPipelineColorBlendAttachmentState     *pAttachments
      { 0.0f, 0.0f, 0.0f, 0.0f }                                    // float                                          blendConstants[4]
    };

    std::vector<VkDynamicState> dynamic_states = {
      VK_DYNAMIC_STATE_VIEWPORT,
      VK_DYNAMIC_STATE_SCISSOR,
    };

    VkPipelineDynamicStateCreateInfo dynamic_state_create_info = {
      VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO,         // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineDynamicStateCreateFlags              flags
      static_cast<uint32_t>(dynamic_states.size()),                 // uint32_t                                       dynamicStateCount
      dynamic_states.data()                                         // const VkDynamicState                          *pDynamicStates
    };

    Tools::AutoDeleter<VkPipelineLayout, PFN_vkDestroyPipelineLayout> pipeline_layout = CreatePipelineLayout();
    if( !pipeline_layout ) {
      return false;
    }

    VkGraphicsPipelineCreateInfo pipeline_create_info = {
      VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,              // VkStructureType                                sType
      nullptr,                                                      // const void                                    *pNext
      0,                                                            // VkPipelineCreateFlags                          flags
      static_cast<uint32_t>(shader_stage_create_infos.size()),      // uint32_t                                       stageCount
      shader_stage_create_infos.data(),                             // const VkPipelineShaderStageCreateInfo         *pStages
      &vertex_input_state_create_info,                              // const VkPipelineVertexInputStateCreateInfo    *pVertexInputState;
      &input_assembly_state_create_info,                            // const VkPipelineInputAssemblyStateCreateInfo  *pInputAssemblyState
      nullptr,                                                      // const VkPipelineTessellationStateCreateInfo   *pTessellationState
      &viewport_state_create_info,                                  // const VkPipelineViewportStateCreateInfo       *pViewportState
      &rasterization_state_create_info,                             // const VkPipelineRasterizationStateCreateInfo  *pRasterizationState
      &multisample_state_create_info,                               // const VkPipelineMultisampleStateCreateInfo    *pMultisampleState
      nullptr,                                                      // const VkPipelineDepthStencilStateCreateInfo   *pDepthStencilState
      &color_blend_state_create_info,                               // const VkPipelineColorBlendStateCreateInfo     *pColorBlendState
      &dynamic_state_create_info,                                   // const VkPipelineDynamicStateCreateInfo        *pDynamicState
      pipeline_layout.Get(),                                        // VkPipelineLayout                               layout
      Vulkan.RenderPass,                                            // VkRenderPass                                   renderPass
      0,                                                            // uint32_t                                       subpass
      VK_NULL_HANDLE,                                               // VkPipeline                                     basePipelineHandle
      -1                                                            // int32_t                                        basePipelineIndex
    };

    if( vkCreateGraphicsPipelines( GetDevice(), VK_NULL_HANDLE, 1, &pipeline_create_info, nullptr, &Vulkan.GraphicsPipeline ) != VK_SUCCESS ) {
      std::cout << "Could not create graphics pipeline!" << std::endl;
      return false;
    }
    return true;
  }

  bool Tutorial04::CreateVertexBuffer() {
    VertexData vertex_data[] = {
      {
        -0.7f, -0.7f, 0.0f, 1.0f,
        1.0f, 0.0f, 0.0f, 0.0f
      },
      {
        -0.7f, 0.7f, 0.0f, 1.0f,
        0.0f, 1.0f, 0.0f, 0.0f
      },
      {
        0.7f, -0.7f, 0.0f, 1.0f,
        0.0f, 0.0f, 1.0f, 0.0f
      },
      {
        0.7f, 0.7f, 0.0f, 1.0f,
        0.3f, 0.3f, 0.3f, 0.0f
      }
    };

    Vulkan.VertexBuffer.Size = sizeof(vertex_data);

    VkBufferCreateInfo buffer_create_info = {
      VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,             // VkStructureType        sType
      nullptr,                                          // const void            *pNext
      0,                                                // VkBufferCreateFlags    flags
      Vulkan.VertexBuffer.Size,                         // VkDeviceSize           size
      VK_BUFFER_USAGE_VERTEX_BUFFER_BIT,                // VkBufferUsageFlags     usage
      VK_SHARING_MODE_EXCLUSIVE,                        // VkSharingMode          sharingMode
      0,                                                // uint32_t               queueFamilyIndexCount
      nullptr                                           // const uint32_t        *pQueueFamilyIndices
    };

    if( vkCreateBuffer( GetDevice(), &buffer_create_info, nullptr, &Vulkan.VertexBuffer.Handle ) != VK_SUCCESS ) {
      std::cout << "Could not create a vertex buffer!" << std::endl;
      return false;
    }

    if( !AllocateBufferMemory( Vulkan.VertexBuffer.Handle, &Vulkan.VertexBuffer.Memory ) ) {
      std::cout << "Could not allocate memory for a vertex buffer!" << std::endl;
      return false;
    }

    if( vkBindBufferMemory( GetDevice(), Vulkan.VertexBuffer.Handle, Vulkan.VertexBuffer.Memory, 0 ) != VK_SUCCESS ) {
      std::cout << "Could not bind memory for a vertex buffer!" << std::endl;
      return false;
    }

    void *vertex_buffer_memory_pointer;
    if( vkMapMemory( GetDevice(), Vulkan.VertexBuffer.Memory, 0, Vulkan.VertexBuffer.Size, 0, &vertex_buffer_memory_pointer ) != VK_SUCCESS ) {
      std::cout << "Could not map memory and upload data to a vertex buffer!" << std::endl;
      return false;
    }

    memcpy( vertex_buffer_memory_pointer, vertex_data, Vulkan.VertexBuffer.Size );

    VkMappedMemoryRange flush_range = {
      VK_STRUCTURE_TYPE_MAPPED_MEMORY_RANGE,            // VkStructureType        sType
      nullptr,                                          // const void            *pNext
      Vulkan.VertexBuffer.Memory,                       // VkDeviceMemory         memory
      0,                                                // VkDeviceSize           offset
      VK_WHOLE_SIZE                                     // VkDeviceSize           size
    };
    vkFlushMappedMemoryRanges( GetDevice(), 1, &flush_range );

    vkUnmapMemory( GetDevice(), Vulkan.VertexBuffer.Memory );

    return true;
  }

  bool Tutorial04::AllocateBufferMemory( VkBuffer buffer, VkDeviceMemory *memory ) {
    VkMemoryRequirements buffer_memory_requirements;
    vkGetBufferMemoryRequirements( GetDevice(), buffer, &buffer_memory_requirements );

    VkPhysicalDeviceMemoryProperties memory_properties;
    vkGetPhysicalDeviceMemoryProperties( GetPhysicalDevice(), &memory_properties );

    for( uint32_t i = 0; i < memory_properties.memoryTypeCount; ++i ) {
      if( (buffer_memory_requirements.memoryTypeBits & (1 << i)) &&
        (memory_properties.memoryTypes[i].propertyFlags & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) ) {

        VkMemoryAllocateInfo memory_allocate_info = {
          VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,     // VkStructureType                        sType
          nullptr,                                    // const void                            *pNext
          buffer_memory_requirements.size,            // VkDeviceSize                           allocationSize
          i                                           // uint32_t                               memoryTypeIndex
        };

        if( vkAllocateMemory( GetDevice(), &memory_allocate_info, nullptr, memory ) == VK_SUCCESS ) {
          return true;
        }
      }
    }
    return false;
  }

  bool Tutorial04::CreateRenderingResources() {
    if( !CreateCommandBuffers() ) {
      return false;
    }
    if( !CreateSemaphores() ) {
      return false;
    }
    if( !CreateFences() ) {
      return false;
    }
    return true;
  }

  bool Tutorial04::CreateCommandBuffers() {
    if( !CreateCommandPool( GetGraphicsQueue().FamilyIndex, &Vulkan.CommandPool ) ) {
      std::cout << "Could not create command pool!" << std::endl;
      return false;
    }
    for( size_t i = 0; i < Vulkan.RenderingResources.size(); ++i ) {
      if( !AllocateCommandBuffers( Vulkan.CommandPool, 1, &Vulkan.RenderingResources[i].CommandBuffer ) ) {
        std::cout << "Could not allocate command buffer!" << std::endl;
        return false;
      }
    }
    return true;
  }

  bool Tutorial04::CreateCommandPool( uint32_t queue_family_index, VkCommandPool *pool ) {
    VkCommandPoolCreateInfo cmd_pool_create_info = {
      VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,       // VkStructureType                sType
      nullptr,                                          // const void                    *pNext
      VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT | // VkCommandPoolCreateFlags       flags
      VK_COMMAND_POOL_CREATE_TRANSIENT_BIT,
      queue_family_index                                // uint32_t                       queueFamilyIndex
    };

    if( vkCreateCommandPool( GetDevice(), &cmd_pool_create_info, nullptr, pool ) != VK_SUCCESS ) {
      return false;
    }
    return true;
  }

  bool Tutorial04::AllocateCommandBuffers( VkCommandPool pool, uint32_t count, VkCommandBuffer *command_buffers ) {
    VkCommandBufferAllocateInfo command_buffer_allocate_info = {
      VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,   // VkStructureType                sType
      nullptr,                                          // const void                    *pNext
      pool,                                             // VkCommandPool                  commandPool
      VK_COMMAND_BUFFER_LEVEL_PRIMARY,                  // VkCommandBufferLevel           level
      count                                             // uint32_t                       bufferCount
    };

    if( vkAllocateCommandBuffers( GetDevice(), &command_buffer_allocate_info, command_buffers ) != VK_SUCCESS ) {
      return false;
    }
    return true;
  }

  bool Tutorial04::CreateSemaphores() {
    VkSemaphoreCreateInfo semaphore_create_info = {
      VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO,          // VkStructureType                sType
      nullptr,                                          // const void*                    pNext
      0                                                 // VkSemaphoreCreateFlags         flags
    };

    for( size_t i = 0; i < Vulkan.RenderingResources.size(); ++i ) {
      if( (vkCreateSemaphore( GetDevice(), &semaphore_create_info, nullptr, &Vulkan.RenderingResources[i].ImageAvailableSemaphore ) != VK_SUCCESS) ||
        (vkCreateSemaphore( GetDevice(), &semaphore_create_info, nullptr, &Vulkan.RenderingResources[i].FinishedRenderingSemaphore ) != VK_SUCCESS) ) {
        std::cout << "Could not create semaphores!" << std::endl;
        return false;
      }
    }
    return true;
  }

  bool Tutorial04::CreateFences() {
    VkFenceCreateInfo fence_create_info = {
      VK_STRUCTURE_TYPE_FENCE_CREATE_INFO,              // VkStructureType                sType
      nullptr,                                          // const void                    *pNext
      VK_FENCE_CREATE_SIGNALED_BIT                      // VkFenceCreateFlags             flags
    };

    for( size_t i = 0; i < Vulkan.RenderingResources.size(); ++i ) {
      if( vkCreateFence( GetDevice(), &fence_create_info, nullptr, &Vulkan.RenderingResources[i].Fence ) != VK_SUCCESS ) {
        std::cout << "Could not create a fence!" << std::endl;
        return false;
      }
    }
    return true;
  }

  bool Tutorial04::PrepareFrame( VkCommandBuffer command_buffer, const ImageParameters &image_parameters, VkFramebuffer &framebuffer ) {
    if( !CreateFramebuffer( framebuffer, image_parameters.View ) ) {
      return false;
    }

    VkCommandBufferBeginInfo command_buffer_begin_info = {
      VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO,        // VkStructureType                        sType
      nullptr,                                            // const void                            *pNext
      VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT,        // VkCommandBufferUsageFlags              flags
      nullptr                                             // const VkCommandBufferInheritanceInfo  *pInheritanceInfo
    };

    vkBeginCommandBuffer( command_buffer, &command_buffer_begin_info );

    VkImageSubresourceRange image_subresource_range = {
      VK_IMAGE_ASPECT_COLOR_BIT,                          // VkImageAspectFlags                     aspectMask
      0,                                                  // uint32_t                               baseMipLevel
      1,                                                  // uint32_t                               levelCount
      0,                                                  // uint32_t                               baseArrayLayer
      1                                                   // uint32_t                               layerCount
    };

    if( GetPresentQueue().Handle != GetGraphicsQueue().Handle ) {
      VkImageMemoryBarrier barrier_from_present_to_draw = {
        VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,           // VkStructureType                        sType
        nullptr,                                          // const void                            *pNext
        VK_ACCESS_MEMORY_READ_BIT,                        // VkAccessFlags                          srcAccessMask
        VK_ACCESS_MEMORY_READ_BIT,                        // VkAccessFlags                          dstAccessMask
        VK_IMAGE_LAYOUT_UNDEFINED,                        // VkImageLayout                          oldLayout
        VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,                  // VkImageLayout                          newLayout
        GetPresentQueue().FamilyIndex,                    // uint32_t                               srcQueueFamilyIndex
        GetGraphicsQueue().FamilyIndex,                   // uint32_t                               dstQueueFamilyIndex
        image_parameters.Handle,                          // VkImage                                image
        image_subresource_range                           // VkImageSubresourceRange                subresourceRange
      };
      vkCmdPipelineBarrier( command_buffer, VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT, VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT, 0, 0, nullptr, 0, nullptr, 1, &barrier_from_present_to_draw );
    }

    VkClearValue clear_value = {
      { 1.0f, 0.8f, 0.4f, 0.0f },                         // VkClearColorValue                      color
    };

    VkRenderPassBeginInfo render_pass_begin_info = {
      VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO,           // VkStructureType                        sType
      nullptr,                                            // const void                            *pNext
      Vulkan.RenderPass,                                  // VkRenderPass                           renderPass
      framebuffer,                                        // VkFramebuffer                          framebuffer
      {                                                   // VkRect2D                               renderArea
        {                                                 // VkOffset2D                             offset
          0,                                                // int32_t                                x
          0                                                 // int32_t                                y
        },
        GetSwapChain().Extent,                            // VkExtent2D                             extent;
      },
      1,                                                  // uint32_t                               clearValueCount
      &clear_value                                        // const VkClearValue                    *pClearValues
    };

    vkCmdBeginRenderPass( command_buffer, &render_pass_begin_info, VK_SUBPASS_CONTENTS_INLINE );

    vkCmdBindPipeline( command_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, Vulkan.GraphicsPipeline );

    VkViewport viewport = {
      0.0f,                                               // float                                  x
      0.0f,                                               // float                                  y
      static_cast<float>(GetSwapChain().Extent.width),    // float                                  width
      static_cast<float>(GetSwapChain().Extent.height),   // float                                  height
      0.0f,                                               // float                                  minDepth
      1.0f                                                // float                                  maxDepth
    };

    VkRect2D scissor = {
      {                                                   // VkOffset2D                             offset
        0,                                                  // int32_t                                x
        0                                                   // int32_t                                y
      },
      {                                                   // VkExtent2D                             extent
        GetSwapChain().Extent.width,                        // uint32_t                               width
        GetSwapChain().Extent.height                        // uint32_t                               height
      }
    };

    vkCmdSetViewport( command_buffer, 0, 1, &viewport );
    vkCmdSetScissor( command_buffer, 0, 1, &scissor );

    VkDeviceSize offset = 0;
    vkCmdBindVertexBuffers( command_buffer, 0, 1, &Vulkan.VertexBuffer.Handle, &offset );

    vkCmdDraw( command_buffer, 4, 1, 0, 0 );

    vkCmdEndRenderPass( command_buffer );

    if( GetGraphicsQueue().Handle != GetPresentQueue().Handle ) {
      VkImageMemoryBarrier barrier_from_draw_to_present = {
        VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER,           // VkStructureType                        sType
        nullptr,                                          // const void                            *pNext
        VK_ACCESS_MEMORY_READ_BIT,                        // VkAccessFlags                          srcAccessMask
        VK_ACCESS_MEMORY_READ_BIT,                        // VkAccessFlags                          dstAccessMask
        VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,                  // VkImageLayout                          oldLayout
        VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,                  // VkImageLayout                          newLayout
        GetGraphicsQueue().FamilyIndex,                   // uint32_t                               srcQueueFamilyIndex
        GetPresentQueue().FamilyIndex,                    // uint32_t                               dstQueueFamilyIndex
        image_parameters.Handle,                          // VkImage                                image
        image_subresource_range                           // VkImageSubresourceRange                subresourceRange
      };
      vkCmdPipelineBarrier( command_buffer, VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT, VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT, 0, 0, nullptr, 0, nullptr, 1, &barrier_from_draw_to_present );
    }

    if( vkEndCommandBuffer( command_buffer ) != VK_SUCCESS ) {
      std::cout << "Could not record command buffer!" << std::endl;
      return false;
    }
    return true;
  }

  bool Tutorial04::CreateFramebuffer( VkFramebuffer &framebuffer, VkImageView image_view ) {
    if( framebuffer != VK_NULL_HANDLE ) {
      vkDestroyFramebuffer( GetDevice(), framebuffer, nullptr );
      framebuffer = VK_NULL_HANDLE;
    }

    VkFramebufferCreateInfo framebuffer_create_info = {
      VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO,      // VkStructureType                sType
      nullptr,                                        // const void                    *pNext
      0,                                              // VkFramebufferCreateFlags       flags
      Vulkan.RenderPass,                              // VkRenderPass                   renderPass
      1,                                              // uint32_t                       attachmentCount
      &image_view,                                    // const VkImageView             *pAttachments
      GetSwapChain().Extent.width,                    // uint32_t                       width
      GetSwapChain().Extent.height,                   // uint32_t                       height
      1                                               // uint32_t                       layers
    };

    if( vkCreateFramebuffer( GetDevice(), &framebuffer_create_info, nullptr, &framebuffer ) != VK_SUCCESS ) {
      std::cout << "Could not create a framebuffer!" << std::endl;
      return false;
    }

    return true;
  }

  bool Tutorial04::ChildOnWindowSizeChanged() {
    return true;
  }

  bool Tutorial04::Draw() {
    static size_t           resource_index = 0;
    RenderingResourcesData &current_rendering_resource = Vulkan.RenderingResources[resource_index];
    VkSwapchainKHR          swap_chain = GetSwapChain().Handle;
    uint32_t                image_index;

    resource_index = (resource_index + 1) % VulkanTutorial04Parameters::ResourcesCount;

    if( vkWaitForFences( GetDevice(), 1, &current_rendering_resource.Fence, VK_FALSE, 1000000000 ) != VK_SUCCESS ) {
      std::cout << "Waiting for fence takes too long!" << std::endl;
      return false;
    }
    vkResetFences( GetDevice(), 1, &current_rendering_resource.Fence );

    VkResult result = vkAcquireNextImageKHR( GetDevice(), swap_chain, UINT64_MAX, current_rendering_resource.ImageAvailableSemaphore, VK_NULL_HANDLE, &image_index );
    switch( result ) {
      case VK_SUCCESS:
      case VK_SUBOPTIMAL_KHR:
        break;
      case VK_ERROR_OUT_OF_DATE_KHR:
        return OnWindowSizeChanged();
      default:
        std::cout << "Problem occurred during swap chain image acquisition!" << std::endl;
        return false;
    }

    if( !PrepareFrame( current_rendering_resource.CommandBuffer, GetSwapChain().Images[image_index], current_rendering_resource.Framebuffer ) ) {
      return false;
    }

    VkPipelineStageFlags wait_dst_stage_mask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
    VkSubmitInfo submit_info = {
      VK_STRUCTURE_TYPE_SUBMIT_INFO,                          // VkStructureType              sType
      nullptr,                                                // const void                  *pNext
      1,                                                      // uint32_t                     waitSemaphoreCount
      &current_rendering_resource.ImageAvailableSemaphore,    // const VkSemaphore           *pWaitSemaphores
      &wait_dst_stage_mask,                                   // const VkPipelineStageFlags  *pWaitDstStageMask;
      1,                                                      // uint32_t                     commandBufferCount
      &current_rendering_resource.CommandBuffer,              // const VkCommandBuffer       *pCommandBuffers
      1,                                                      // uint32_t                     signalSemaphoreCount
      &current_rendering_resource.FinishedRenderingSemaphore  // const VkSemaphore           *pSignalSemaphores
    };

    if( vkQueueSubmit( GetGraphicsQueue().Handle, 1, &submit_info, current_rendering_resource.Fence ) != VK_SUCCESS ) {
      return false;
    }

    VkPresentInfoKHR present_info = {
      VK_STRUCTURE_TYPE_PRESENT_INFO_KHR,                     // VkStructureType              sType
      nullptr,                                                // const void                  *pNext
      1,                                                      // uint32_t                     waitSemaphoreCount
      &current_rendering_resource.FinishedRenderingSemaphore, // const VkSemaphore           *pWaitSemaphores
      1,                                                      // uint32_t                     swapchainCount
      &swap_chain,                                            // const VkSwapchainKHR        *pSwapchains
      &image_index,                                           // const uint32_t              *pImageIndices
      nullptr                                                 // VkResult                    *pResults
    };
    result = vkQueuePresentKHR( GetPresentQueue().Handle, &present_info );

    switch( result ) {
      case VK_SUCCESS:
        break;
      case VK_ERROR_OUT_OF_DATE_KHR:
      case VK_SUBOPTIMAL_KHR:
        return OnWindowSizeChanged();
      default:
        std::cout << "Problem occurred during image presentation!" << std::endl;
        return false;
    }

    return true;
  }

  void Tutorial04::ChildClear() {
  }

  Tutorial04::~Tutorial04() {
    if( GetDevice() != VK_NULL_HANDLE ) {
      vkDeviceWaitIdle( GetDevice() );

      for( size_t i = 0; i < Vulkan.RenderingResources.size(); ++i ) {
        if( Vulkan.RenderingResources[i].Framebuffer != VK_NULL_HANDLE ) {
          vkDestroyFramebuffer( GetDevice(), Vulkan.RenderingResources[i].Framebuffer, nullptr );
        }
        if( Vulkan.RenderingResources[i].CommandBuffer != VK_NULL_HANDLE ) {
          vkFreeCommandBuffers( GetDevice(), Vulkan.CommandPool, 1, &Vulkan.RenderingResources[i].CommandBuffer );
        }
        if( Vulkan.RenderingResources[i].ImageAvailableSemaphore != VK_NULL_HANDLE ) {
          vkDestroySemaphore( GetDevice(), Vulkan.RenderingResources[i].ImageAvailableSemaphore, nullptr );
        }
        if( Vulkan.RenderingResources[i].FinishedRenderingSemaphore != VK_NULL_HANDLE ) {
          vkDestroySemaphore( GetDevice(), Vulkan.RenderingResources[i].FinishedRenderingSemaphore, nullptr );
        }
        if( Vulkan.RenderingResources[i].Fence != VK_NULL_HANDLE ) {
          vkDestroyFence( GetDevice(), Vulkan.RenderingResources[i].Fence, nullptr );
        }
      }

      if( Vulkan.CommandPool != VK_NULL_HANDLE ) {
        vkDestroyCommandPool( GetDevice(), Vulkan.CommandPool, nullptr );
        Vulkan.CommandPool = VK_NULL_HANDLE;
      }

      if( Vulkan.VertexBuffer.Handle != VK_NULL_HANDLE ) {
        vkDestroyBuffer( GetDevice(), Vulkan.VertexBuffer.Handle, nullptr );
        Vulkan.VertexBuffer.Handle = VK_NULL_HANDLE;
      }

      if( Vulkan.VertexBuffer.Memory != VK_NULL_HANDLE ) {
        vkFreeMemory( GetDevice(), Vulkan.VertexBuffer.Memory, nullptr );
        Vulkan.VertexBuffer.Memory = VK_NULL_HANDLE;
      }

      if( Vulkan.GraphicsPipeline != VK_NULL_HANDLE ) {
        vkDestroyPipeline( GetDevice(), Vulkan.GraphicsPipeline, nullptr );
        Vulkan.GraphicsPipeline = VK_NULL_HANDLE;
      }

      if( Vulkan.RenderPass != VK_NULL_HANDLE ) {
        vkDestroyRenderPass( GetDevice(), Vulkan.RenderPass, nullptr );
        Vulkan.RenderPass = VK_NULL_HANDLE;
      }
    }
  }

} // namespace ApiWithoutSecrets