# VkRenderPassFragmentDensityMapCreateInfoEXT(3) Manual Page

## Name

VkRenderPassFragmentDensityMapCreateInfoEXT - Structure containing fragment density map attachment for render pass

## 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:

    typedef struct VkRenderPassFragmentDensityMapCreateInfoEXT {
        VkStructureType          sType;
        const void*              pNext;
        VkAttachmentReference    fragmentDensityMapAttachment;
    } VkRenderPassFragmentDensityMapCreateInfoEXT;

## Members

- `sType` is the type of this structure.

- `pNext` is `NULL` or a pointer to an extension-specific structure.

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

## Description

The fragment density map attachment is read at an implementation-dependent time either by the host during vkCmdBeginRenderPass if the attachment’s image view was not created with `flags` containing `VK_IMAGE_VIEW_CREATE_FRAGMENT_DENSITY_MAP_DYNAMIC_BIT_EXT`, or by the device when drawing commands in the renderpass execute `VK_PIPELINE_STAGE_FRAGMENT_DENSITY_PROCESS_BIT_EXT`.

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

Valid Usage

- If `fragmentDensityMapAttachment` is not `VK_ATTACHMENT_UNUSED`, `fragmentDensityMapAttachment` must be less than `VkRenderPassCreateInfo`::`attachmentCount`

- 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

- 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`

- 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`.

- 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)

- `sType` must be `VK_STRUCTURE_TYPE_RENDER_PASS_FRAGMENT_DENSITY_MAP_CREATE_INFO_EXT`

- `fragmentDensityMapAttachment` must be a valid VkAttachmentReference structure

## See Also

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 (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.