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heaps: Add ShaderRecord blurb #388

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12 changes: 8 additions & 4 deletions chapters/descriptor_heap.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -168,7 +168,7 @@ The first time you look at `VkDescriptorMappingSourceEXT` and all the options, i
** VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT
** VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT
** VK_DESCRIPTOR_MAPPING_SOURCE_INDIRECT_ADDRESS_EXT
* **Shader Record** (Ray Tracing)
* **Shader Record** (Ray Tracing SBT)
** VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_**SHADER_RECORD**_INDEX_EXT
** VK_DESCRIPTOR_MAPPING_SOURCE_**SHADER_RECORD**_DATA_EXT
** VK_DESCRIPTOR_MAPPING_SOURCE_**SHADER_RECORD**_ADDRESS_EXT
Expand Down Expand Up @@ -351,10 +351,14 @@ Only Uniform Buffers, Storage Buffers, and Acceleration Structures are allowed f

=== VkDescriptorMappingSourceEXT Shader Record

A `Shader Record`` refers to an entry in the link:https://docs.vulkan.org/spec/latest/chapters/raytracing.html#shader-binding-table[Shader Binding Table (SBT)]
[NOTE]
====
todo - Add Ray Tracing section
====

The mappings work the exact same, just instead of mapping to a descriptor, such as a buffer/image/accelerationStructure, it maps to a shader record.

- `VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT` works just like `VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT`
- `VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_DATA_EXT` works just like `VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT`
- `VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT` works just like `VK_DESCRIPTOR_MAPPING_SOURCE_INDIRECT_ADDRESS_EXT`

=== VkDescriptorMappingSourceEXT bindingCount alias

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