Creating an input attachment

Attachments are images into which we render during drawing commands, inside render passes. In other words, they are render targets.

Input attachments are image resources from which we can read (unfiltered) data inside fragment shaders. We just need to remember that we can access only one location corresponding to a processed fragment.

Usually, for input attachments, resources that were previously color or depth/stencil attachments are used. But we can also use other images (and their image views). We just need to create them with a VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT usage.

How to do it...

1. Take the physical device on which operations are performed and store its handle in a variable of type VkPhysicalDevice named physical_device.
2. Select a format for an image and use it to initialize a variable of type VkFormat named format.
3. Create a variable of type VkFormatProperties named format_properties.
4. Call vkGetPhysicalDeviceFormatProperties( physical_device, format, &format_properties...