# VkSubpassMergeStatusEXT(3) Manual Page

## Name

VkSubpassMergeStatusEXT - Specify a subpass merging status

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## C Specification

Possible values of `VkRenderPassSubpassFeedbackInfoEXT`:subpassMergeStatus are:

    // Provided by VK_EXT_subpass_merge_feedback
    typedef enum VkSubpassMergeStatusEXT {
        VK_SUBPASS_MERGE_STATUS_MERGED_EXT = 0,
        VK_SUBPASS_MERGE_STATUS_DISALLOWED_EXT = 1,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_SIDE_EFFECTS_EXT = 2,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_SAMPLES_MISMATCH_EXT = 3,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_VIEWS_MISMATCH_EXT = 4,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_ALIASING_EXT = 5,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_DEPENDENCIES_EXT = 6,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_INCOMPATIBLE_INPUT_ATTACHMENT_EXT = 7,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_TOO_MANY_ATTACHMENTS_EXT = 8,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_INSUFFICIENT_STORAGE_EXT = 9,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_DEPTH_STENCIL_COUNT_EXT = 10,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_RESOLVE_ATTACHMENT_REUSE_EXT = 11,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_SINGLE_SUBPASS_EXT = 12,
        VK_SUBPASS_MERGE_STATUS_NOT_MERGED_UNSPECIFIED_EXT = 13,
    } VkSubpassMergeStatusEXT;

## Description

- VK_SUBPASS_MERGE_STATUS_MERGED_EXT specifies that the subpass is merged with a previous subpass.

- VK_SUBPASS_MERGE_STATUS_DISALLOWED_EXT specifies that the subpass is not merged because merging was disabled using VkRenderPassCreationControlEXT. If the render pass does not allow subpass merging, then all subpass statuses are set to this value. If a subpass description does not allow subpass merging, then only that subpass’s status is set to this value.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_SIDE_EFFECTS_EXT specifies that the subpass is not merged because it contains side effects.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_SAMPLES_MISMATCH_EXT specifies that the subpass is not merged because sample count is not compatible with the previous subpass.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_VIEWS_MISMATCH_EXT specifies that the subpass is not merged because view masks do not match with previous subpass.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_ALIASING_EXT specifies that the subpass is not merged because of attachments aliasing between them.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_DEPENDENCIES_EXT specifies that the subpass is not merged because subpass dependencies do not allow merging.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_INCOMPATIBLE_INPUT_ATTACHMENT_EXT specifies that the subpass is not merged because input attachment is not a color attachment from previous subpass or the formats are incompatible.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_TOO_MANY_ATTACHMENTS_EXT specifies that the subpass is not merged because of too many attachments.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_INSUFFICIENT_STORAGE_EXT specifies that the subpass is not merged because of insufficient memory.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_DEPTH_STENCIL_COUNT_EXT specifies that the subpass is not merged because of too many depth/stencil attachments.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_RESOLVE_ATTACHMENT_REUSE_EXT specifies that the subpass is not merged because a resolve attachment is reused as an input attachment in a subsequent subpass.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_SINGLE_SUBPASS_EXT specifies that the subpass is not merged because the render pass has only one subpass.

- VK_SUBPASS_MERGE_STATUS_NOT_MERGED_UNSPECIFIED_EXT specifies that the subpass is not merged for unspecified reasons. Implementations should return this value when no other VkSubpassMergeStatusEXT value is appropriate.

## See Also

VK_EXT_subpass_merge_feedback, VkRenderPassSubpassFeedbackInfoEXT

## 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