topic vkGetPhysicalDeviceSurfaceFormatsKHR doesn't fill format count correctly in Graphics

vkGetPhysicalDeviceSurfaceFormatsKHR doesn't fill format count correctly

AKapo3 — Sun, 30 Sep 2018 17:48:29 GMT

As per Vulkan spec, vkGetPhysicalDeviceSurfaceFormatsKHR should fill pSurfaceFormatCount as follows:

Otherwise, pSurfaceFormatCount must point to a variable set by the user to the number of elements in the pSurfaceFormats array, and on return the variable is overwritten with the number of structures actually written to pSurfaceFormats.

However, this code:

VkSurfaceFormatKHR formats[16];

uint32_t formatCount = sizeof(formats) / sizeof(formats[0]);

VK_CHECK(vkGetPhysicalDeviceSurfaceFormatsKHR(physicalDevice, surface, &formatCount, formats));

Leaves formatCount as 16 after vkGetPhysicalDeviceSurfaceFormatsKHR successfully returns (and fills 2 values in the formats buffer).

This happens on Windows 10, 24.20.100.6286 graphics driver as reported by dxdiag

This bug also occurs with

AKapo3 — Sun, 30 Sep 2018 17:53:24 GMT

This bug also occurs with vkGetSwapchainImagesKHR, and possibly other swapchain functions?

Note: this also happens with

AKapo3 — Tue, 02 Oct 2018 17:06:00 GMT

Hello,

Michael_C_Intel2 — Thu, 29 Nov 2018 17:38:16 GMT

Hello,

We released a new graphics driver (25.20.100.6444) yesterday (11/28) and it has the fix for your issue. You can get details on the driver here: https://downloadcenter.intel.com/download/28139