file.cpp

namespace vku
{
    namespace detail
    {
        template <typename Func, typename T = std::remove_pointer<typename meta::function_arg_t<Func, 2>::type>::type>
        inline std::vector<T> get_api_values(Func func)
        {
            uint32_t count = 0;
            if (func(&count, nullptr) == VK_SUCCESS && count > 0)
            {
                std::vector<T> available_values(count);
                if (func(&count, available_values.data()) == VK_SUCCESS)
                    return available_values;
            }

            return{};
        }

        inline std::vector<VkExtensionProperties> get_instance_extensions()
        {
            auto f = [](uint32_t* count, VkExtensionProperties* values) { return vk::vkEnumerateInstanceExtensionProperties(nullptr, count, values); };
            return get_api_values(f);
        }

        inline std::vector<VkLayerProperties> get_instance_layers()
        {
            auto f = [](uint32_t* count, VkLayerProperties* values) { return vk::vkEnumerateInstanceLayerProperties(count, values); };
            return get_api_values(f);
        }

        inline std::vector<VkPhysicalDevice> get_physical_devices(const VkInstance& instance)
        {
            auto f = [=](uint32_t* count, VkPhysicalDevice* values) { return vk::vkEnumeratePhysicalDevices(instance, count, values); };
            return get_api_values(f);
        }

        inline std::vector<VkExtensionProperties> get_physical_device_extensions(const VkPhysicalDevice& physical_device)
        {
            auto f = [=](uint32_t* count, VkExtensionProperties* values) { return vk::vkEnumerateDeviceExtensionProperties(physical_device, nullptr, count, values); };
            return get_api_values(f);
        }

        inline std::vector<VkLayerProperties> get_physical_device_layers(const VkPhysicalDevice& physical_device)
        {
            auto f = [=](uint32_t* count, VkLayerProperties* values) { return vk::vkEnumerateDeviceLayerProperties(physical_device, count, values); };
            return get_api_values(f);
        }

        inline std::vector<VkSurfaceFormatKHR> get_surface_formats(const VkPhysicalDevice& physical_device, const VkSurfaceKHR& surface)
        {
            auto f = [=](uint32_t* count, VkSurfaceFormatKHR* values) { return vk::vkGetPhysicalDeviceSurfaceFormatsKHR(physical_device, surface, count, values); };
            return get_api_values(f);
        }

        inline std::vector<VkPresentModeKHR> get_present_modes(const VkPhysicalDevice& physical_device, const VkSurfaceKHR& surface)
        {
            auto f = [=](uint32_t* count, VkPresentModeKHR* values) { return vk::vkGetPhysicalDeviceSurfacePresentModesKHR(physical_device, surface, count, values); };
            return get_api_values(f);
        }
    }
}

namespace meta
{
    template <typename Func, bool Builtin = boost::function_types::is_callable_builtin<Func>::value>
    struct function_arity;

    template <typename Func>
    struct function_arity<Func, true> : boost::function_types::function_arity<Func>
    {};

    template <typename Func>
    struct function_arity<Func, false> : function_arity<decltype(&Func::operator())>
    {};

    template <typename Func, int index, bool Builtin = boost::function_types::is_callable_builtin<Func>::value>
    struct function_arg_t;

    template <typename Func, int index>
    struct function_arg_t<Func, index, true> : boost::mpl::at<typename boost::function_types::parameter_types<Func>::type, boost::mpl::int_<index>>
    {};

    template <typename Func, int index>
    struct function_arg_t<Func, index, false> : function_arg_t<decltype(&Func::operator())>
    {};
}