Implement Vulkan transient depth buffer (#1423)

The depth buffer is cleared/uninitialized at the start of a render pass and discarded at the end and does not need to be backed by video memory at all.
This depth buffer texture can possibly be backed by transiently rather than allocating unused device memory("memoryless").

This this will test and utilize transient memory when available.

TestFramework/Renderer/VK/RendererVK.cpp

@@ -690,7 +690,26 @@ void RendererVK::CreateSwapChain(VkPhysicalDevice inDevice)
 
 	// Create depth buffer
 	VkFormat depth_format = FindDepthFormat();
-	CreateImage(mSwapChainExtent.width, mSwapChainExtent.height, depth_format, VK_IMAGE_TILING_OPTIMAL, VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, mDepthImage, mDepthImageMemory);
+	VkImageUsageFlags depth_usage = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;
+	VkMemoryPropertyFlags depth_memory_properties = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
+
+	// Test and utilize support for transient memory for the depth buffer
+	VkImageFormatProperties depth_transient_properties = {};
+	VkResult depth_transient_support = vkGetPhysicalDeviceImageFormatProperties(mPhysicalDevice, depth_format, VK_IMAGE_TYPE_2D, VK_IMAGE_TILING_OPTIMAL, depth_usage | VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT, 0, &depth_transient_properties);
+	if (depth_transient_support == VK_SUCCESS)
+	{
+		depth_usage |= VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT;
+
+		// Test and utilize lazily allocated memory for the depth buffer
+		for (size_t i = 0; i < mMemoryProperties.memoryTypeCount; i++)
+			if (mMemoryProperties.memoryTypes[i].propertyFlags & VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT)
+			{
+				depth_memory_properties = VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT;
+				break;
+			}
+	}
+
+	CreateImage(mSwapChainExtent.width, mSwapChainExtent.height, depth_format, VK_IMAGE_TILING_OPTIMAL, depth_usage, depth_memory_properties, mDepthImage, mDepthImageMemory);
 	mDepthImageView = CreateImageView(mDepthImage, depth_format, VK_IMAGE_ASPECT_DEPTH_BIT);
 
 	// Create frame buffers for the normal pass