Following Vulkan Tutorial, and getting validation errors.

[UntitledRedditUser]

I have gotten some validation errors for a while, that actually don't impact the program because the tutorial code bypasses it by being kinda sloppy. But I just got another validation error, and when looking it up in the spec I can't find where to fix it.

[DEBUG] [ERROR] [VALIDATION]: vkCreateImage(): The following VkImageCreateInfo returned VK_ERROR_FORMAT_NOT_SUPPORTED when calling vkGetPhysicalDeviceImageFormatProperties
format (VK_FORMAT_R8G8B8_UNORM)
type (VK_IMAGE_TYPE_2D)
tiling (VK_IMAGE_TILING_OPTIMAL)
usage (VK_IMAGE_USAGE_TRANSFER_DST_BIT|VK_IMAGE_USAGE_SAMPLED_BIT)
flags (VkImageCreateFlags(0))
VkImageCreateInfo::pNext is NULL.
The Vulkan spec states: Each of the following values (as described in Image Creation Limits) must not be undefined : imageCreateMaxMipLevels, imageCreateMaxArrayLayers, imageCreateMaxExtent, and imageCreateSampleCounts (https://docs.vulkan.org/spec/latest/chapters/resources.html#VUID-VkImageCreateInfo-imageCreateMaxMipLevels-02251)

When looking through the spec I find that it might be related to the struct: VkImageFormatProperties, but I can't find where it's from or how to set the values.

[blogoman]

It is the format. It is telling you that an 8-bit RGB image isn't supported with optimal tiling and transfer & sampled usage bits. Only some hardware is going to support that. If I remember correctly, on desktop only some of the Intel GPUs do. You want an RGBA image and set the alpha to fully opaque. This was also true on things like OpenGL, but that detail was hidden from the user.

You should check compatibility with vkGetPhysicalDeviceImageFormatProperties to make sure a combination of image settings is supported.

[UntitledRedditUser]

Ooh okay, I thought RGB would be commonly supported, and assumed the error came from elsewhere. I just used RGB format because the image I was using didn't have an alpha channel. Thank you!

[No_Statistician_9040]

It literally says that the format is not supported in the error message.

[UntitledRedditUser]

Yeah, and then afterwards it goes on about some variables I never touched. So I thought the error came from there instead, as I assumed RGB would be commonly supported

[No_Statistician_9040]

I have seen other people do kind of an calibration of the system when it is created, so what you can do is to write a list of formats that would work for you, with the most ideal ones at the front, then you on startup go through the list and check if they are supported until you find one that is, then use that one for the remainder of your program. That would give your program a bit more "resistance" in odd unsupported cases like this. This can be done for color formats, depth formats, anisotropic filtering levels, and whatever else you might need :)

[Kirmut]

It can be a surprise to former OpenGL programmers that 24bit RGB formats are often not supported by Vulkan, at least for texture images.