Method BInitVulkanDevice

samples/hellovr_vulkan/hellovr_vulkan_main.cpp:931–1078

----------------------------------------------------------------------------- Purpose: Initialize Vulkan VkDevice -----------------------------------------------------------------------------

// Purpose: Initialize Vulkan VkDevice
//-----------------------------------------------------------------------------
bool CMainApplication::BInitVulkanDevice()
{
	uint32_t nDeviceCount = 0;
	VkResult nResult = vkEnumeratePhysicalDevices( m_pInstance, &nDeviceCount, NULL );
	if ( nResult != VK_SUCCESS || nDeviceCount == 0 )
	{
		dprintf( "vkEnumeratePhysicalDevices failed, unable to init and enumerate GPUs with Vulkan.\n" );
		return false;
	}

	VkPhysicalDevice *pPhysicalDevices = new VkPhysicalDevice[ nDeviceCount ];
	nResult = vkEnumeratePhysicalDevices( m_pInstance, &nDeviceCount, pPhysicalDevices );
	if ( nResult != VK_SUCCESS || nDeviceCount == 0 )
	{
		dprintf( "vkEnumeratePhysicalDevices failed, unable to init and enumerate GPUs with Vulkan.\n" );
		return false;
	}

	// Query OpenVR for the physical device to use
	uint64_t pHMDPhysicalDevice = 0;
	m_pHMD->GetOutputDevice( &pHMDPhysicalDevice, vr::TextureType_Vulkan, ( VkInstance_T * ) m_pInstance );

	// Select the HMD physical device
	m_pPhysicalDevice = VK_NULL_HANDLE;
	for ( uint32_t nPhysicalDevice = 0; nPhysicalDevice < nDeviceCount; nPhysicalDevice++ )
	{
		if ( ( ( VkPhysicalDevice ) pHMDPhysicalDevice ) == pPhysicalDevices[ nPhysicalDevice ] )
		{
			m_pPhysicalDevice = ( VkPhysicalDevice ) pHMDPhysicalDevice;
			break;
		}
	}
	if ( m_pPhysicalDevice == VK_NULL_HANDLE )
	{
		// Fallback: Grab the first physical device
		dprintf( "Failed to find GetOutputDevice VkPhysicalDevice, falling back to choosing first device.\n" );
		m_pPhysicalDevice = pPhysicalDevices[ 0 ];
	}
	delete [] pPhysicalDevices;

	vkGetPhysicalDeviceProperties( m_pPhysicalDevice, &m_physicalDeviceProperties );
	vkGetPhysicalDeviceMemoryProperties( m_pPhysicalDevice, &m_physicalDeviceMemoryProperties );
	vkGetPhysicalDeviceFeatures( m_pPhysicalDevice, &m_physicalDeviceFeatures );

	//--------------------//
	// VkDevice creation  //
	//--------------------//
	// Query OpenVR for the required device extensions for this physical device
	std::vector< std::string > requiredDeviceExtensions;
	GetVulkanDeviceExtensionsRequired( m_pPhysicalDevice, requiredDeviceExtensions );
	// Add additional required extensions
	requiredDeviceExtensions.push_back( VK_KHR_SWAPCHAIN_EXTENSION_NAME );

	// Find the first graphics queue
	uint32_t nQueueCount = 0;
	vkGetPhysicalDeviceQueueFamilyProperties( m_pPhysicalDevice, &nQueueCount, 0 );
	VkQueueFamilyProperties *pQueueFamilyProperties = new VkQueueFamilyProperties[ nQueueCount ];
	vkGetPhysicalDeviceQueueFamilyProperties( m_pPhysicalDevice, &nQueueCount, pQueueFamilyProperties );