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
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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.