Method CreateDescriptorSetGroup

libs/drape/vulkan/vulkan_object_manager.cpp:205–263

}

DescriptorSetGroup VulkanObjectManager::CreateDescriptorSetGroup(ref_ptr<VulkanGpuProgram> program)
{
  CHECK(std::this_thread::get_id() == m_renderers[ThreadType::Frontend], ());

  DescriptorSetGroup s;
  VkDescriptorSetLayout layout = program->GetDescriptorSetLayout();
  VkDescriptorSetAllocateInfo allocInfo = {};

  // Find a pool with available sets.
  uint32_t poolIndex = 0;
  while (poolIndex <= m_descriptorPools.size())
  {
    // No such a pool, create one.
    if (poolIndex == m_descriptorPools.size())
      CreateDescriptorPool();

    // No available sets in the pool, try next one.
    if (m_descriptorPools[poolIndex].m_availableSetsCount == 0)
    {
      poolIndex++;
      continue;
    }

    // Allocate a descriptor set.
    allocInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;
    allocInfo.descriptorPool = m_descriptorPools[poolIndex].m_pool;
    s.m_descriptorPoolIndex = poolIndex;
    allocInfo.pSetLayouts = &layout;
    allocInfo.descriptorSetCount = 1;

    // Decrease the available sets count.
    m_descriptorPools[poolIndex].m_availableSetsCount--;

    auto const r = vkAllocateDescriptorSets(m_device, &allocInfo, &s.m_descriptorSet);
    if (r == VK_ERROR_FRAGMENTED_POOL || r == VK_ERROR_OUT_OF_POOL_MEMORY)
    {
      poolIndex++;
      m_descriptorPools[poolIndex].m_availableSetsCount++;
    }
    else if (r != VK_SUCCESS)
    {
      CHECK_VK_CALL(r);
    }
    else
    {
      break;
    }
  }

  TRACE_COUNTER("[drape][vulkan] Descriptor pools", static_cast<int64_t>(m_descriptorPools.size()));
#ifdef ENABLE_TRACE
  int64_t usedDescriptorsSets = 0;
  for (auto const & pool : m_descriptorPools)
    usedDescriptorsSets += (kMaxDescriptorsSetCount - pool.m_availableSetsCount);
  TRACE_COUNTER("[drape][vulkan] Descriptor sets", usedDescriptorsSets);
#endif

  return s;