# VkDescriptorMappingSourceDataEXT(3) Manual Page

## Name

VkDescriptorMappingSourceDataEXT - Union descriptor mapping source information

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## C Specification

The `VkDescriptorMappingSourceDataEXT` union is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef union VkDescriptorMappingSourceDataEXT {
        VkDescriptorMappingSourceConstantOffsetEXT        constantOffset;
        VkDescriptorMappingSourcePushIndexEXT             pushIndex;
        VkDescriptorMappingSourceIndirectIndexEXT         indirectIndex;
        VkDescriptorMappingSourceIndirectIndexArrayEXT    indirectIndexArray;
        VkDescriptorMappingSourceHeapDataEXT              heapData;
        uint32_t                                          pushDataOffset;
        uint32_t                                          pushAddressOffset;
        VkDescriptorMappingSourceIndirectAddressEXT       indirectAddress;
        VkDescriptorMappingSourceShaderRecordIndexEXT     shaderRecordIndex;
        uint32_t                                          shaderRecordDataOffset;
        uint32_t                                          shaderRecordAddressOffset;
    } VkDescriptorMappingSourceDataEXT;

## Members

- `constantOffset` is a VkDescriptorMappingSourceConstantOffsetEXT structure specifying the mapping for resources at a constant byte offset into a heap.

- `pushIndex` is a VkDescriptorMappingSourcePushIndexEXT structure specifying the mapping for resources at an index into a heap source from push data.

- `indirectIndex` is a VkDescriptorMappingSourceIndirectIndexEXT structure specifying the mapping for resources at an index into a heap source from an address in push data.

- `indirectIndexArray` is a VkDescriptorMappingSourceIndirectIndexArrayEXT structure specifying the mapping for resources to an array of indices into a heap source from an address in push data.

- `heapData` is a VkDescriptorMappingSourceHeapDataEXT structure specifying an offset into heap data for a uniform buffer to map to.

- `pushDataOffset` an offset into push data for a uniform buffer to map to.

- `pushAddressOffset` an offset into push data storing an address for a resource to map to.

- `indirectAddress` is a VkDescriptorMappingSourceIndirectAddressEXT structure specifying an address in push data containing another address for a resource to map to.

- `shaderRecordIndex` is a VkDescriptorMappingSourceShaderRecordIndexEXT structure specifying the mapping for resources at an index into a heap source from shader record data.

- `shaderRecordDataOffset` an offset into shader record data for a uniform buffer to map to.

- `shaderRecordAddressOffset` an offset into shader record data storing an address for a resource to map to.

## Description

## See Also

VK_EXT_descriptor_heap, VkDescriptorMappingSourceConstantOffsetEXT, VkDescriptorMappingSourceHeapDataEXT, VkDescriptorMappingSourceIndirectAddressEXT, VkDescriptorMappingSourceIndirectIndexArrayEXT, VkDescriptorMappingSourceIndirectIndexEXT, VkDescriptorMappingSourcePushIndexEXT, VkDescriptorMappingSourceShaderRecordIndexEXT, VkDescriptorSetAndBindingMappingEXT

## Document Notes

For more information, see the Vulkan Specification.

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0