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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0