impeller::YUVConversionVK Class Reference

It is sometimes necessary to deal with formats not native to Vulkan. In such cases, extra information is necessary to access images. A YUV conversion object is needed in such instances. More...

#include <yuv_conversion_vk.h>

Public Member Functions
	~YUVConversionVK ()
	YUVConversionVK (const YUVConversionVK &)=delete
YUVConversionVK &	operator= (const YUVConversionVK &)=delete
bool	IsValid () const
const YUVConversionDescriptorVK &	GetDescriptor () const
	Get the descriptor used to create this conversion. More...
vk::SamplerYcbcrConversion	GetConversion () const

Friends
class	YUVConversionLibraryVK

Detailed Description

It is sometimes necessary to deal with formats not native to Vulkan. In such cases, extra information is necessary to access images. A YUV conversion object is needed in such instances.

There are usually only a handful of viable conversions in a given context. However, due to the way the Vulkan spec. treats "identically defined" conversions, only a single conversion object is valid for an equivalent YUVConversionDescriptorVK. Because of this restriction, it is not possible to just create a conversion from a descriptor (as the underlying handles will be equivalent but different). Instead, a conversion may only be obtained from a conversion library. Libraries handle hashing and caching conversions by descriptor. Caller can find a library on the top-level context. They may not create their own (the constructor is private).

Definition at line 51 of file yuv_conversion_vk.h.

Constructor & Destructor Documentation

~YUVConversionVK()

impeller::YUVConversionVK::~YUVConversionVK ( )

default

YUVConversionVK()

impeller::YUVConversionVK::YUVConversionVK ( const YUVConversionVK &  )

delete

Member Function Documentation

GetConversion()

vk::SamplerYcbcrConversion impeller::YUVConversionVK::GetConversion

(

)

const

Returns

The Vulkan handle of the YUV conversion.

Definition at line 33 of file yuv_conversion_vk.cc.

                                                              {
  return conversion_ ? conversion_.get()
                     : static_cast<vk::SamplerYcbcrConversion>(VK_NULL_HANDLE);
}

GetDescriptor()

const YUVConversionDescriptorVK & impeller::YUVConversionVK::GetDescriptor

(

)

const

Get the descriptor used to create this conversion.

Definition at line 38 of file yuv_conversion_vk.cc.

                                                                      {
  return chain_;
}

IsValid()

bool impeller::YUVConversionVK::IsValid

(

)

const

Returns

true if this conversion is valid for use with images and samplers.

Definition at line 29 of file yuv_conversion_vk.cc.

                                    {
  return conversion_ && !!conversion_.get();
}

operator=()

YUVConversionVK& impeller::YUVConversionVK::operator= ( const YUVConversionVK &  )

delete

Friends And Related Function Documentation

YUVConversionLibraryVK

friend class YUVConversionLibraryVK

friend

Definition at line 76 of file yuv_conversion_vk.h.

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The documentation for this class was generated from the following files:

• impeller/renderer/backend/vulkan/yuv_conversion_vk.h
• impeller/renderer/backend/vulkan/yuv_conversion_vk.cc