# VkDisplayPlaneAlphaFlagBitsKHR(3) Manual Page

## Name

VkDisplayPlaneAlphaFlagBitsKHR - Alpha blending type

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## C Specification

Bits which can be set in VkDisplaySurfaceCreateInfoKHR::`alphaMode`, specifying the type of alpha blending to use on a display, are:

    // Provided by VK_KHR_display
    typedef enum VkDisplayPlaneAlphaFlagBitsKHR {
        VK_DISPLAY_PLANE_ALPHA_OPAQUE_BIT_KHR = 0x00000001,
        VK_DISPLAY_PLANE_ALPHA_GLOBAL_BIT_KHR = 0x00000002,
        VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_BIT_KHR = 0x00000004,
        VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_PREMULTIPLIED_BIT_KHR = 0x00000008,
    } VkDisplayPlaneAlphaFlagBitsKHR;

## Description

- `VK_DISPLAY_PLANE_ALPHA_OPAQUE_BIT_KHR` specifies that the source image will be treated as opaque.

- `VK_DISPLAY_PLANE_ALPHA_GLOBAL_BIT_KHR` specifies that a global alpha value must be specified that will be applied to all pixels in the source image.

- `VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_BIT_KHR` specifies that the alpha value will be determined by the alpha component of the source image’s pixels. If the source format contains no alpha values, no blending will be applied. The source alpha values are not premultiplied into the source image’s other color components.

- `VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_PREMULTIPLIED_BIT_KHR` is equivalent to `VK_DISPLAY_PLANE_ALPHA_PER_PIXEL_BIT_KHR`, except the source alpha values are assumed to be premultiplied into the source image’s other color components.

## See Also

VK_KHR_display, VkDisplayPlaneAlphaFlagsKHR, VkDisplaySurfaceCreateInfoKHR

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0