--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/buffer.nim	Thu Jan 05 01:16:48 2023 +0700
@@ -0,0 +1,57 @@
+import ./vulkan
+import ./vulkan_helpers
+
+type
+  BufferType* = enum
+    VertexBuffer = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT
+  Buffer* = object
+    device*: VkDevice
+    vkBuffer*: VkBuffer
+    size*: uint64
+    memoryRequirements*: VkMemoryRequirements
+    memory*: VkDeviceMemory
+
+proc findMemoryType(buffer: Buffer, physicalDevice: VkPhysicalDevice, properties: VkMemoryPropertyFlags): uint32 =
+  var physicalProperties: VkPhysicalDeviceMemoryProperties
+  vkGetPhysicalDeviceMemoryProperties(physicalDevice, addr(physicalProperties))
+
+  for i in 0'u32 ..< physicalProperties.memoryTypeCount:
+    if bool(buffer.memoryRequirements.memoryTypeBits and (1'u32 shl i)) and (uint32(physicalProperties.memoryTypes[i].propertyFlags) and uint32(properties)) == uint32(properties):
+        return i
+
+proc InitBuffer*(device: VkDevice, physicalDevice: VkPhysicalDevice, size: uint64, bufferType: BufferType): Buffer =
+  result.device = device
+  result.size = size
+  var bufferInfo = VkBufferCreateInfo(
+    sType: VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO,
+    size: VkDeviceSize(result.size),
+    usage: VkBufferUsageFlags(bufferType),
+    sharingMode: VK_SHARING_MODE_EXCLUSIVE,
+
+  )
+  checkVkResult vkCreateBuffer(result.device, addr(bufferInfo), nil, addr(result.vkBuffer))
+  vkGetBufferMemoryRequirements(result.device, result.vkBuffer, addr(result.memoryRequirements))
+
+  var allocInfo = VkMemoryAllocateInfo(
+    sType: VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
+    allocationSize: result.memoryRequirements.size,
+    memoryTypeIndex: result.findMemoryType(
+      physicalDevice,
+      VkMemoryPropertyFlags(uint32(VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) or uint32(VK_MEMORY_PROPERTY_HOST_COHERENT_BIT))
+    )
+  )
+  checkVkResult result.device.vkAllocateMemory(addr(allocInfo), nil, addr(result.memory))
+  checkVkResult result.device.vkBindBufferMemory(result.vkBuffer, result.memory, VkDeviceSize(0))
+
+
+template withMapping*(buffer: Buffer, data: pointer, body: untyped): untyped =
+  checkVkResult buffer.device.vkMapMemory(buffer.memory, offset=VkDeviceSize(0), VkDeviceSize(buffer.size), VkMemoryMapFlags(0), addr(data));
+  body
+  buffer.device.vkUnmapMemory(buffer.memory);
+
+
+proc `=copy`(a: var Buffer, b: Buffer){.error.}
+
+proc `=destroy`*(buffer: var Buffer) =
+  vkDestroyBuffer(buffer.device, buffer.vkBuffer, nil)
+  vkFreeMemory(buffer.device, buffer.memory, nil);