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// Copyright (c) 2016 The vulkano developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.

use std::collections::HashSet;
use std::ffi::{CStr, CString};
use std::fmt;
use std::iter::FromIterator;
use std::ptr;
use std::str;

use VulkanObject;
use check_errors;
use instance::PhysicalDevice;
use extensions::SupportedExtensionsError;
use vk;

macro_rules! device_extensions {
    ($sname:ident, $rawname:ident, $($ext:ident => $s:expr,)*) => (
        extensions! {
            $sname, $rawname,
            $( $ext => $s,)*
        }

        impl $rawname {
            /// See the docs of supported_by_device().
            pub fn supported_by_device_raw(physical_device: PhysicalDevice) -> Result<Self, SupportedExtensionsError> {
                let vk = physical_device.instance().pointers();

                let properties: Vec<vk::ExtensionProperties> = unsafe {
                    let mut num = 0;
                    check_errors(vk.EnumerateDeviceExtensionProperties(
                        physical_device.internal_object(), ptr::null(), &mut num, ptr::null_mut()
                    ))?;

                    let mut properties = Vec::with_capacity(num as usize);
                    check_errors(vk.EnumerateDeviceExtensionProperties(
                        physical_device.internal_object(), ptr::null(), &mut num, properties.as_mut_ptr()
                    ))?;
                    properties.set_len(num as usize);
                    properties
                };
                Ok($rawname(properties.iter().map(|x| unsafe { CStr::from_ptr(x.extensionName.as_ptr()) }.to_owned()).collect()))
            }

            /// Returns an `Extensions` object with extensions supported by the `PhysicalDevice`.
            pub fn supported_by_device(physical_device: PhysicalDevice) -> Self {
                match $rawname::supported_by_device_raw(physical_device) {
                    Ok(l) => l,
                    Err(SupportedExtensionsError::LoadingError(_)) => unreachable!(),
                    Err(SupportedExtensionsError::OomError(e)) => panic!("{:?}", e),
                }
            }
        }

        impl $sname {
            /// See the docs of supported_by_device().
            pub fn supported_by_device_raw(physical_device: PhysicalDevice) -> Result<Self, SupportedExtensionsError> {
                let vk = physical_device.instance().pointers();

                let properties: Vec<vk::ExtensionProperties> = unsafe {
                    let mut num = 0;
                    check_errors(vk.EnumerateDeviceExtensionProperties(
                        physical_device.internal_object(), ptr::null(), &mut num, ptr::null_mut()
                    ))?;

                    let mut properties = Vec::with_capacity(num as usize);
                    check_errors(vk.EnumerateDeviceExtensionProperties(
                        physical_device.internal_object(), ptr::null(), &mut num, properties.as_mut_ptr()
                    ))?;
                    properties.set_len(num as usize);
                    properties
                };

                let mut extensions = $sname::none();
                for property in properties {
                    let name = unsafe { CStr::from_ptr(property.extensionName.as_ptr()) };
                    $(
                        // TODO: Check specVersion?
                        if name.to_bytes() == &$s[..] {
                            extensions.$ext = true;
                        }
                    )*
                }

                Ok(extensions)
            }

            /// Returns an `Extensions` object with extensions supported by the `PhysicalDevice`.
            pub fn supported_by_device(physical_device: PhysicalDevice) -> Self {
                match $sname::supported_by_device_raw(physical_device) {
                    Ok(l) => l,
                    Err(SupportedExtensionsError::LoadingError(_)) => unreachable!(),
                    Err(SupportedExtensionsError::OomError(e)) => panic!("{:?}", e),
                }
            }
        }
    );
}

device_extensions! {
    DeviceExtensions,
    RawDeviceExtensions,
    khr_swapchain => b"VK_KHR_swapchain",
    khr_display_swapchain => b"VK_KHR_display_swapchain",
    khr_sampler_mirror_clamp_to_edge => b"VK_KHR_sampler_mirror_clamp_to_edge",
    khr_maintenance1 => b"VK_KHR_maintenance1",
    khr_get_memory_requirements2 => b"VK_KHR_get_memory_requirements2",
    khr_dedicated_allocation => b"VK_KHR_dedicated_allocation",
    khr_incremental_present => b"VK_KHR_incremental_present",
    khr_16bit_storage => b"VK_KHR_16bit_storage",
    khr_storage_buffer_storage_class => b"VK_KHR_storage_buffer_storage_class",
    ext_debug_utils => b"VK_EXT_debug_utils",
    khr_multiview => b"VK_KHR_multiview",
}

/// This helper type can only be instantiated inside this module.
/// See `*Extensions::_unbuildable`.
#[doc(hidden)]
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct Unbuildable(());

#[cfg(test)]
mod tests {
    use device::{DeviceExtensions, RawDeviceExtensions};

    #[test]
    fn empty_extensions() {
        let d: RawDeviceExtensions = (&DeviceExtensions::none()).into();
        assert!(d.iter().next().is_none());
    }
}