CL/Vulkan: Set host cached bit for HOST_PTR buffers

Leads to better performance on "clEnqueueReadBuffer" operations
when CL buffers are created as host-pointer based buffers.

Bug: angleproject:42267018
Change-Id: I18048deea96858180b63cfad95fe33fbab7f11c9
Signed-off-by: kyongjoo.oh <[email protected]>
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6981096
Commit-Queue: Austin Annestrand <[email protected]>
Reviewed-by: Shahbaz Youssefi <[email protected]>

Author: kjoh94

src/libANGLE/renderer/vulkan/vk_cl_utils.cpp

@@ -106,9 +106,13 @@ VkImageViewType GetImageViewType(cl::MemObjectType memObjectType)
 
 VkMemoryPropertyFlags GetMemoryPropertyFlags(cl::MemFlags memFlags)
 {
-    // TODO: http://anglebug.com/42267018
     VkMemoryPropertyFlags propFlags = VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT;
 
+    if (memFlags.intersects(CL_MEM_USE_HOST_PTR | CL_MEM_ALLOC_HOST_PTR))
+    {
+        propFlags |= VK_MEMORY_PROPERTY_HOST_COHERENT_BIT | VK_MEMORY_PROPERTY_HOST_CACHED_BIT;
+    }
+
     if (memFlags.intersects(CL_MEM_USE_HOST_PTR | CL_MEM_ALLOC_HOST_PTR | CL_MEM_COPY_HOST_PTR))
     {
         propFlags |= VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT;