Vulkan swapchain image extent capabilities

0
votes

I am doing query on swapchain capabilities where I am checking on currentExtent,minImageExtent and maxImageExtent properties of VkSurfaceCapabilitiesKHR.

For window size of 128x128 I am getting:

currentExtent = 148x128

minImageExtent = 148x128

maxImageExtent = 148x128

But for window size 256x256 I am getting:

currentExtent = 256x256

minImageExtent = 256x256

maxImageExtent = 256x256

For 1280x720:

currentExtent = 1280x720

minImageExtent = 1280x720

maxImageExtent = 1280x720

I have two questions:

  1. Why for 128x128 the width is not the same value?
  2. Why current,min,max for the rest of dimension are the same?

My hardware: NVIDIA RTX 3000, Driver version 431.86, Windows 10

1
vulkan

1 Answers

0
votes

Q1: Feels like a bug (yours, or driver).

Q2: Because it works like that on some platforms. See the specification, e.g.:

With Win32, minImageExtent, maxImageExtent, and currentExtent must always equal the window size.