VkSamplerYcbcrModelConversion

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

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,
} VkSamplerYcbcrModelConversion;

or the equivalent

#define VkSamplerYcbcrModelConversionKHR VkSamplerYcbcrModelConversion

• 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′C_BC_R.
• VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_709 specifies the color model conversion from Y′C_BC_R to R′G′B′ defined in BT.709 and described in the BT.709 Y′C_BC_R conversion section of the Khronos Data Format Specification.
• VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_601 specifies the color model conversion from Y′C_BC_R to R′G′B′ defined in BT.601 and described in the BT.601 Y′C_BC_R conversion section of the Khronos Data Format Specification.
• VK_SAMPLER_YCBCR_MODEL_CONVERSION_YCBCR_2020 specifies the color model conversion from Y′C_BC_R to R′G′B′ defined in BT.2020 and described in the BT.2020 Y′C_BC_R 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′C_BC_R range expansion and model conversion:

• the Y (Y′ luma) component corresponds to the G component of an RGB image.
• the CB (C_B or U blue color difference) component corresponds to the B component of an RGB image.
• the CR (C_R 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).