VkDescriptorPoolSize

typedef struct VkDescriptorPoolSize {
    VkDescriptorType type;
    uint32_t descriptorCount;
} VkDescriptorPoolSize;

pub struct DescriptorPoolSize {
    type: vk::DescriptorType,
    descriptor_count: u32,
}

When creating a descriptor pool that will contain descriptors for combined image samplers with Y′C_BC_R conversion, an application needs to account for non-trivial descriptor consumption when choosing the descriptorCount value, as indicated by VkSamplerYcbcrConversionImageFormatProperties::combinedImageSamplerDescriptorCount.For simplicity, the application can use the VkPhysicalDeviceMaintenance6Properties::maxCombinedImageSamplerDescriptorCount property to conservatively size the descriptorCount value instead of querying combinedImageSamplerDescriptorCount for each format.Applications must use maxCombinedImageSamplerDescriptorCount to size the descriptorCount value for image samplers with an Android external format as it is not possible to query combinedImageSamplerDescriptorCount for those formats.