VkPhysicalDeviceTransformFeedbackPropertiesEXT(3)

# VkPhysicalDeviceTransformFeedbackPropertiesEXT(3) Manual Page

## Name

VkPhysicalDeviceTransformFeedbackPropertiesEXT - Structure describing transform feedback properties that can be supported by an implementation

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## C Specification

The `VkPhysicalDeviceTransformFeedbackPropertiesEXT` structure is defined as:

    // Provided by VK_EXT_transform_feedback
    typedef struct VkPhysicalDeviceTransformFeedbackPropertiesEXT {
        VkStructureType    sType;
        void*              pNext;
        uint32_t           maxTransformFeedbackStreams;
        uint32_t           maxTransformFeedbackBuffers;
        VkDeviceSize       maxTransformFeedbackBufferSize;
        uint32_t           maxTransformFeedbackStreamDataSize;
        uint32_t           maxTransformFeedbackBufferDataSize;
        uint32_t           maxTransformFeedbackBufferDataStride;
        VkBool32           transformFeedbackQueries;
        VkBool32           transformFeedbackStreamsLinesTriangles;
        VkBool32           transformFeedbackRasterizationStreamSelect;
        VkBool32           transformFeedbackDraw;
    } VkPhysicalDeviceTransformFeedbackPropertiesEXT;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `maxTransformFeedbackStreams` is the maximum number of vertex streams that can be output from geometry shaders declared with the `GeometryStreams` capability. If the implementation does not support `VkPhysicalDeviceTransformFeedbackFeaturesEXT`::`geometryStreams` then `maxTransformFeedbackStreams` must be set to `1`.

- `maxTransformFeedbackBuffers` is the maximum number of transform feedback buffers that can be bound for capturing shader outputs from the last pre-rasterization shader stage.

- `maxTransformFeedbackBufferSize` is the maximum size that can be specified when binding a buffer for transform feedback in vkCmdBindTransformFeedbackBuffersEXT.

- `maxTransformFeedbackStreamDataSize` is the maximum amount of data in bytes for each vertex that captured to one or more transform feedback buffers associated with a specific vertex stream.

- `maxTransformFeedbackBufferDataSize` is the maximum amount of data in bytes for each vertex that can be captured to a specific transform feedback buffer.

- `maxTransformFeedbackBufferDataStride` is the maximum stride between each capture of vertex data to the buffer.

- `transformFeedbackQueries` is `VK_TRUE` if the implementation supports the `VK_QUERY_TYPE_TRANSFORM_FEEDBACK_STREAM_EXT` query type. `transformFeedbackQueries` is `VK_FALSE` if queries of this type cannot be created.

- `transformFeedbackStreamsLinesTriangles` is `VK_TRUE` if the implementation supports the geometry shader `OpExecutionMode` of `OutputLineStrip` and `OutputTriangleStrip` in addition to `OutputPoints` when more than one vertex stream is output. If `transformFeedbackStreamsLinesTriangles` is `VK_FALSE` the implementation only supports an `OpExecutionMode` of `OutputPoints` when more than one vertex stream is output from the geometry shader.

- `transformFeedbackRasterizationStreamSelect` is `VK_TRUE` if the implementation supports the `GeometryStreams` SPIR-V capability and the application can use VkPipelineRasterizationStateStreamCreateInfoEXT to modify which vertex stream output is used for rasterization. Otherwise vertex stream `0` must always be used for rasterization.

- `transformFeedbackDraw` is `VK_TRUE` if the implementation supports the vkCmdDrawIndirectByteCountEXT function otherwise the function must not be called.

## Description

If the `VkPhysicalDeviceTransformFeedbackPropertiesEXT` structure is included in the `pNext` chain of the VkPhysicalDeviceProperties2 structure passed to vkGetPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

Valid Usage (Implicit)

- VUID-VkPhysicalDeviceTransformFeedbackPropertiesEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TRANSFORM_FEEDBACK_PROPERTIES_EXT`

## See Also

VK_EXT_transform_feedback, VkBool32, VkDeviceSize, 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 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0