vulkan_object.py missing Extension Requires Depends info

[charles-lunarg]

The Vulkan XML has various depends tags attached to requires block. This data is useful for generating command dependencies on extensions, but is not accessible in vulkan_object.py.

For example, vkGetDeviceGroupSurfacePresentModes2EXT is provided by VK_EXT_full_screen_exclusive but requires either VK_KHR_device_group or VK_VERSION_1_1 to be enabled.

An XML description taken from the spec:

<extension name="VK_EXT_full_screen_exclusive" ...>           

    <require depends="VK_KHR_device_group,VK_VERSION_1_1">
        <command name="vkGetDeviceGroupSurfacePresentModes2EXT"/>
    </require>
</extension>

This was found while trying to update the Vulkan-Loader codegen to use vulkan_object.py, and while it was possible to hardcode this, it would be helpful to have this information.

[spencer-lunarg]

Ok, trying envision how this would actually look now. Using 2 edge case of vkGetDeviceGroupPresentCapabilitiesKHR and vkGetDeviceGroupSurfacePresentModes2EXT

1. vkGetDeviceGroupPresentCapabilitiesKHR is found in

<extension name="VK_KHR_swapchain">
    <require depends="VK_VERSION_1_1">
        <command name="vkGetDeviceGroupPresentCapabilitiesKHR"/>
    </require>
</extension>
<extension name="VK_KHR_device_group">
    <require depends="VK_KHR_surface">
        <command name="vkGetDeviceGroupPresentCapabilitiesKHR"/>
    </require>
</extension>

and going self.vk.commands['vkGetDeviceGroupPresentCapabilitiesKHR'].extensions gives you the array of VK_KHR_swapchain and VK_KHR_device_group

2. vkGetDeviceGroupSurfacePresentModes2EXT

<extension name="VK_EXT_full_screen_exclusive">
    <require depends="VK_KHR_device_group,VK_VERSION_1_1">
        <command name="vkGetDeviceGroupSurfacePresentModes2EXT"/>
    </require>
</extension>

and going self.vk.commands['vkGetDeviceGroupSurfacePresentModes2EXT'].extensions gives you just VK_EXT_full_screen_exclusive

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I guess not how to best represent this whole extension relationship together