# VkDisplayPlaneAlphaFlagBitsKHR(3) Manual Page

## Name

VkDisplayPlaneAlphaFlagBitsKHR - Alpha blending type

## C Specification

Possible values of VkDisplaySurfaceCreateInfoKHR::`alphaMode`, specifying the type of alpha blending to use on a display, are:

    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,
        VK_DISPLAY_PLANE_ALPHA_FLAG_BITS_MAX_ENUM_KHR = 0x7FFFFFFF
    } 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 channel 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 channels.

- `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 channels.

## See Also

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