--- a/src/semicongine/vulkan/buffer.nim	Tue Feb 28 00:08:52 2023 +0700
+++ b/src/semicongine/vulkan/buffer.nim	Tue Feb 28 23:51:07 2023 +0700
@@ -1,14 +1,15 @@
 import ./api
+import ./device
 
 type
   Buffer = object
-    device: VkDevice
+    device: Device
     vk: VkBuffer
     size: uint64
 
 # currently no support for extended structure and concurrent/shared use
 # (shardingMode = VK_SHARING_MODE_CONCURRENT not supported)
-proc createBuffer(device: VkDevice, size: uint64, flags: openArray[VkBufferCreateFlagBits], usage: openArray[VkBufferUsageFlagBits]): Buffer =
+proc createBuffer(device: Device, size: uint64, flags: openArray[VkBufferCreateFlagBits], usage: openArray[VkBufferUsageFlagBits]): Buffer =
   result.device = device
   result.size = size
   var createInfo = VkBufferCreateInfo(
@@ -20,12 +21,13 @@
   )
 
   checkVkResult vkCreateBuffer(
-    device=device,
+    device=device.vk,
     pCreateInfo=addr createInfo,
     pAllocator=nil,
     pBuffer=addr result.vk
   )
 
 proc destroy(buffer: Buffer) =
-  if uint(buffer.vk) != 0:
-    vkDestroyBuffer(buffer.device, buffer.vk, nil)
+  assert buffer.device.vk.valid
+  assert buffer.vk.valid
+  buffer.device.vk.vkDestroyBuffer(buffer.vk, nil)