Vulkan/Device: Add useful accessors

Former-commit-id: b2b6378b2b9a8de2ad1c47b72f2acd6dd86a087a

include/Nazara/Vulkan/VkDevice.inl

@@ -36,6 +36,16 @@ namespace Nz
 			return vkGetDeviceQueue(m_device, queueFamilyIndex, queueIndex, queue);
 		}
 
+		inline Instance& Device::GetInstance()
+		{
+			return m_instance;
+		}
+
+		inline const Instance& Device::GetInstance() const
+		{
+			return m_instance;
+		}
+
 		inline VkResult Device::GetLastErrorCode() const
 		{
 			return m_lastErrorCode;
@@ -53,6 +63,11 @@ namespace Nz
 			return true;
 		}
 
+		inline Device::operator VkDevice()
+		{
+			return m_device;
+		}
+
 		inline PFN_vkVoidFunction Device::GetProcAddr(const char* name)
 		{
 			PFN_vkVoidFunction func = m_instance.GetDeviceProcAddr(m_device, name);