# VkRenderPassFragmentDensityMapCreateInfoEXT(3) Manual Page

## Name

VkRenderPassFragmentDensityMapCreateInfoEXT - Structure containing fragment density map attachment for render pass

Loading… please wait.

## C Specification

If the VkRenderPassCreateInfo::`pNext` chain includes a `VkRenderPassFragmentDensityMapCreateInfoEXT` structure, then that structure includes a fragment density map attachment for the render pass.

The `VkRenderPassFragmentDensityMapCreateInfoEXT` structure is defined as:

    // Provided by VK_EXT_fragment_density_map
    typedef struct VkRenderPassFragmentDensityMapCreateInfoEXT {
        VkStructureType          sType;
        const void*              pNext;
        VkAttachmentReference    fragmentDensityMapAttachment;
    } VkRenderPassFragmentDensityMapCreateInfoEXT;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `fragmentDensityMapAttachment` is the fragment density map to use for the render pass.

## Description

The fragment density map is read at an implementation-dependent time with the following constraints determined by the attachment’s image view `flags`:

- `VK_IMAGE_VIEW_CREATE_FRAGMENT_DENSITY_MAP_DYNAMIC_BIT_EXT` specifies that the fragment density map will be read by the device during `VK_PIPELINE_STAGE_FRAGMENT_DENSITY_PROCESS_BIT_EXT`

- `VK_IMAGE_VIEW_CREATE_FRAGMENT_DENSITY_MAP_DEFERRED_BIT_EXT` specifies that the fragment density map will be read by the host during vkEndCommandBuffer of the primary command buffer that the render pass is recorded into

- Otherwise the fragment density map will be read by the host during vkCmdBeginRenderPass

The fragment density map may additionally be read by the device during `VK_PIPELINE_STAGE_FRAGMENT_DENSITY_PROCESS_BIT_EXT` for any mode.

If this structure is not present, it is as if `fragmentDensityMapAttachment` was given as `VK_ATTACHMENT_UNUSED`.

Valid Usage

- VUID-VkRenderPassFragmentDensityMapCreateInfoEXT-fragmentDensityMapAttachment-02548
  If `fragmentDensityMapAttachment` is not `VK_ATTACHMENT_UNUSED`, `fragmentDensityMapAttachment` must not be an element of `VkSubpassDescription`::`pInputAttachments`, `VkSubpassDescription`::`pColorAttachments`, `VkSubpassDescription`::`pResolveAttachments`, `VkSubpassDescription`::`pDepthStencilAttachment`, or `VkSubpassDescription`::`pPreserveAttachments` for any subpass

- VUID-VkRenderPassFragmentDensityMapCreateInfoEXT-fragmentDensityMapAttachment-02549
  If `fragmentDensityMapAttachment` is not `VK_ATTACHMENT_UNUSED`, `layout` must be equal to `VK_IMAGE_LAYOUT_FRAGMENT_DENSITY_MAP_OPTIMAL_EXT`, or `VK_IMAGE_LAYOUT_GENERAL`

- VUID-VkRenderPassFragmentDensityMapCreateInfoEXT-fragmentDensityMapAttachment-02550
  If `fragmentDensityMapAttachment` is not `VK_ATTACHMENT_UNUSED`, `fragmentDensityMapAttachment` must reference an attachment with a `loadOp` equal to `VK_ATTACHMENT_LOAD_OP_LOAD` or `VK_ATTACHMENT_LOAD_OP_DONT_CARE`

- VUID-VkRenderPassFragmentDensityMapCreateInfoEXT-fragmentDensityMapAttachment-02551
  If `fragmentDensityMapAttachment` is not `VK_ATTACHMENT_UNUSED`, `fragmentDensityMapAttachment` must reference an attachment with a `storeOp` equal to `VK_ATTACHMENT_STORE_OP_DONT_CARE`

Valid Usage (Implicit)

- VUID-VkRenderPassFragmentDensityMapCreateInfoEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_RENDER_PASS_FRAGMENT_DENSITY_MAP_CREATE_INFO_EXT`

- VUID-VkRenderPassFragmentDensityMapCreateInfoEXT-fragmentDensityMapAttachment-parameter
  `fragmentDensityMapAttachment` must be a valid VkAttachmentReference structure

## See Also

VK_EXT_fragment_density_map, VkAttachmentReference, VkStructureType

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0