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.