在MoltenVK中启用实例扩展

Question

我想利用Vulkan1.0.38中支持的扩展，目前有47个扩展在初始化MoltenVK实例时被打印出来。有趣的是，当我调用vkEnumerateInstanceExtensionProperties时，我只得到其中的9个：

VK_KHR_device_group_creation
VK_KHR_get_physical_device_properties2
VK_KHR_get_surface_capabilities2
VK_KHR_surface
VK_EXT_debug_report
VK_EXT_debug_utils
VK_EXT_metal_surface
VK_EXT_swapchain_colorspace
VK_MVK_macos_surface

我对VK_EXT_hdr_metadata特别感兴趣，但它没有出现在这个列表中。这是MoltenVK说它支持的支持扩展的完整列表，但我不能使用：

    The following 47 Vulkan extensions are supported:
        VK_KHR_16bit_storage v1
        VK_KHR_8bit_storage v1
        VK_KHR_bind_memory2 v1
        VK_KHR_dedicated_allocation v3
        VK_KHR_descriptor_update_template v1
        VK_KHR_device_group v4
        VK_KHR_device_group_creation v1
        VK_KHR_get_memory_requirements2 v1
        VK_KHR_get_physical_device_properties2 v2
        VK_KHR_get_surface_capabilities2 v1
        VK_KHR_image_format_list v1
        VK_KHR_maintenance1 v2
        VK_KHR_maintenance2 v1
        VK_KHR_maintenance3 v1
        VK_KHR_push_descriptor v2
        VK_KHR_relaxed_block_layout v1
        VK_KHR_sampler_mirror_clamp_to_edge v3
        VK_KHR_shader_draw_parameters v1
        VK_KHR_shader_float16_int8 v1
        VK_KHR_storage_buffer_storage_class v1
        VK_KHR_surface v25
        VK_KHR_swapchain v70
        VK_KHR_swapchain_mutable_format v1
        VK_KHR_uniform_buffer_standard_layout v1
        VK_KHR_variable_pointers v1
        VK_EXT_debug_marker v4
        VK_EXT_debug_report v9
        VK_EXT_debug_utils v1
        VK_EXT_fragment_shader_interlock v1
        VK_EXT_hdr_metadata v2
        VK_EXT_host_query_reset v1
        VK_EXT_memory_budget v1
        VK_EXT_metal_surface v1
        VK_EXT_scalar_block_layout v1
        VK_EXT_shader_stencil_export v1
        VK_EXT_shader_viewport_index_layer v1
        VK_EXT_swapchain_colorspace v4
        VK_EXT_texel_buffer_alignment v1
        VK_EXT_vertex_attribute_divisor v3
        VK_EXTX_portability_subset v1
        VK_MVK_macos_surface v2
        VK_MVK_moltenvk v22
        VK_AMD_gpu_shader_half_float v2
        VK_AMD_negative_viewport_height v1
        VK_AMD_shader_trinary_minmax v1
        VK_INTEL_shader_integer_functions2 v1
        VK_NV_glsl_shader v1

Answer 1

VK_EXT_hdr_metadata是一个设备扩展，并且只会在vkEnumerateDeviceExtensionProperties输出中显示。