# VkSamplerYcbcrModelConversion(3) Manual Page

## Name

VkSamplerYcbcrModelConversion - Color model component of a color space

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## C Specification

VkSamplerYcbcrModelConversion defines the conversion from the source color model to the shader color model. Possible values are:

    // Provided by VK_VERSION_1_1
    typedef enum VkSamplerYcbcrModelConversion {
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_RGB_IDENTITY = 0,
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_IDENTITY = 1,
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709 = 2,
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_601 = 3,
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020 = 4,
      // Provided by VK_KHR_sampler_ycbcr_conversion
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_RGB_IDENTITY_KHR = VK_SAMPLER_YCBCR_MODEL_CONVERSION_RGB_IDENTITY,
      // Provided by VK_KHR_sampler_ycbcr_conversion
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_IDENTITY_KHR = VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_IDENTITY,
      // Provided by VK_KHR_sampler_ycbcr_conversion
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709_KHR = VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709,
      // Provided by VK_KHR_sampler_ycbcr_conversion
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_601_KHR = VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_601,
      // Provided by VK_KHR_sampler_ycbcr_conversion
        VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020_KHR = VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020,
    } VkSamplerYcbcrModelConversion;

or the equivalent

    // Provided by VK_KHR_sampler_ycbcr_conversion
    typedef VkSamplerYcbcrModelConversion VkSamplerYcbcrModelConversionKHR;

## Description

- `VK_SAMPLER_YCBCR_MODEL_CONVERSION_RGB_IDENTITY` specifies that the input values to the conversion are unmodified.

- `VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_IDENTITY` specifies no model conversion but the inputs are range expanded as for Y′CBCR.

- `VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709` specifies the color model conversion from Y′CBCR to R′G′B′ defined in BT.709 and described in the “BT.709 Y′CBCR conversion” section of the Khronos Data Format Specification.

- `VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_601` specifies the color model conversion from Y′CBCR to R′G′B′ defined in BT.601 and described in the “BT.601 Y′CBCR conversion” section of the Khronos Data Format Specification.

- `VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020` specifies the color model conversion from Y′CBCR to R′G′B′ defined in BT.2020 and described in the “BT.2020 Y′CBCR conversion” section of the Khronos Data Format Specification.

In the `VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_*` color models, for the input to the sampler Y′CBCR range expansion and model conversion:

- the Y (Y′ luma) component corresponds to the G component of an RGB image.

- the CB (CB or “U” blue color difference) component corresponds to the B component of an RGB image.

- the CR (CR or “V” red color difference) component corresponds to the R component of an RGB image.

- the alpha component, if present, is not modified by color model conversion.

These rules reflect the mapping of components after the component swizzle operation (controlled by VkSamplerYcbcrConversionCreateInfo::`components`).

Note | For example, an “YUVA” 32-bit format comprising four 8-bit components can be implemented as `VK_FORMAT_R8G8B8A8_UNORM` with a component mapping: `components.a` = `VK_COMPONENT_SWIZZLE_IDENTITY` `components.r` = `VK_COMPONENT_SWIZZLE_B` `components.g` = `VK_COMPONENT_SWIZZLE_R` `components.b` = `VK_COMPONENT_SWIZZLE_G`

## See Also

VK_VERSION_1_1, VkAndroidHardwareBufferFormatProperties2ANDROID, VkAndroidHardwareBufferFormatPropertiesANDROID, VkBufferCollectionPropertiesFUCHSIA, VkSamplerYcbcrConversionCreateInfo, VkScreenBufferFormatPropertiesQNX

## 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