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spencer-lunarg merged 1 commit into from
Sep 29, 2025
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Update descriptor_buffer.adoc #351

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5 changes: 5 additions & 0 deletions chapters/descriptor_buffer.adoc
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Expand Up @@ -101,6 +101,11 @@ vkGetDescriptorSetLayoutBindingOffsetEXT(device, ds_layout_0, 2, &binding_2_offs
// ...
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[NOTE]
====
While it seems we could just go `VkPhysicalDeviceDescriptorBufferPropertiesEXT::storageBufferDescriptorSize * 3` to get the size, this is wrong as the driver might have to reserve extra memory for the descriptors for the VkDescriptorSetLayout. The storageBufferDescriptorSize value is used for mapping (see below) with `vkGetDescriptorEXT`.
====

== Creating Descriptor Buffers

We will create a "special" `VkBuffer` with `VK_BUFFER_USAGE_RESOURCE_DESCRIPTOR_BUFFER_BIT_EXT` that now makes it a "descriptor buffer" `VkBuffer`.
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