# VkConditionalRenderingBeginInfoEXT(3) Manual Page

## Name

VkConditionalRenderingBeginInfoEXT - Structure specifying conditional rendering begin info

## C Specification

The `VkConditionalRenderingBeginInfoEXT` structure is defined as:

    typedef struct VkConditionalRenderingBeginInfoEXT {
        VkStructureType                   sType;
        const void*                       pNext;
        VkBuffer                          buffer;
        VkDeviceSize                      offset;
        VkConditionalRenderingFlagsEXT    flags;
    } VkConditionalRenderingBeginInfoEXT;

## Members

- `sType` is the type of this structure.

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

- `buffer` is a buffer containing the predicate for conditional rendering.

- `offset` is the byte offset into `buffer` where the predicate is located.

- `flags` is a bitmask of VkConditionalRenderingFlagsEXT specifying the behavior of conditional rendering.

## Description

If the 32-bit value at `offset` in `buffer` memory is zero, then the rendering commands are discarded, otherwise they are executed as normal. If the value of the predicate in buffer memory changes while conditional rendering is active, the rendering commands may be discarded in an implementation-dependent way. Some implementations may latch the value of the predicate upon beginning conditional rendering while others may read it before every rendering command.

Valid Usage

- If `buffer` is non-sparse then it must be bound completely and contiguously to a single `VkDeviceMemory` object

- `buffer` must have been created with the `VK_BUFFER_USAGE_CONDITIONAL_RENDERING_BIT_EXT` bit set

- `offset` must be less than the size of `buffer` by at least 32 bits.

- `offset` must be a multiple of 4

Valid Usage (Implicit)

- `sType` must be `VK_STRUCTURE_TYPE_CONDITIONAL_RENDERING_BEGIN_INFO_EXT`

- `pNext` must be `NULL`

- `buffer` must be a valid VkBuffer handle

- `flags` must be a valid combination of VkConditionalRenderingFlagBitsEXT values

## See Also

VkBuffer, VkConditionalRenderingFlagsEXT, `VkDeviceSize`, VkStructureType, vkCmdBeginConditionalRenderingEXT

## 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.