Function main

RAII_Samples/InitTexture/InitTexture.cpp:29–197

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

int main()
{
  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( 50, 50 ) );

    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, { {}, 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 );

    /* 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 );

    // in order to get a clean desctruction sequence, instantiate the DeviceMemory for the image first
    vk::raii::DeviceMemory imageMemory( nullptr );

    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 );
    vk::raii::Image     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 );
    imageMemory = vk::raii::DeviceMemory( device, memoryAllocateInfo );