为什么 vkGetPhysicalDeviceSurfaceFormatsKHR 不必 return 至少一种当前模式？
Why doesn't vkGetPhysicalDeviceSurfaceFormatsKHR have to return at least one present mode?
函数vkGetPhysicalDeviceSurfaceFormatsKHR必须return至少一种格式，as described in the specification:
The number of format pairs supported must be greater than or equal to 1. pSurfaceFormats must not contain an entry whose value for format is VK_FORMAT_UNDEFINED.
为什么 vkGetPhysicalDeviceSurfacePresentModesKHR 不一样？我假设应该始终至少支持一种当前模式，因为 Valid Usage Requirements for this function 要求 surface 由 physicalDevice:
支持
Valid Usage
VUID-vkGetPhysicalDeviceSurfacePresentModesKHR-surface-06211
surface must be supported by physicalDevice, as reported by vkGetPhysicalDeviceSurfaceSupportKHR or an equivalent platform-specific mechanism
支持 surface，我想，这意味着向它展示是可能的，所以展示模式应该始终可用。也许这是规范中的疏忽？
始终至少支持一种呈现模式：
VK_PRESENT_MODE_FIFO_KHR specifies ... This is the only value of presentMode that is required to be supported.
标准中的表述方式不同。
函数vkGetPhysicalDeviceSurfaceFormatsKHR必须return至少一种格式，as described in the specification:
The number of format pairs supported must be greater than or equal to 1.
pSurfaceFormatsmust not contain an entry whose value forformatisVK_FORMAT_UNDEFINED.
为什么 vkGetPhysicalDeviceSurfacePresentModesKHR 不一样？我假设应该始终至少支持一种当前模式，因为 Valid Usage Requirements for this function 要求 surface 由 physicalDevice:
Valid Usage
VUID-vkGetPhysicalDeviceSurfacePresentModesKHR-surface-06211
surfacemust be supported byphysicalDevice, as reported byvkGetPhysicalDeviceSurfaceSupportKHRor an equivalent platform-specific mechanism
支持 surface，我想，这意味着向它展示是可能的，所以展示模式应该始终可用。也许这是规范中的疏忽？
始终至少支持一种呈现模式：
VK_PRESENT_MODE_FIFO_KHRspecifies ... This is the only value ofpresentModethat is required to be supported.
标准中的表述方式不同。