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use crate::Error;
use crate::device::Shared;
use crate::format::{SUPPORTED, vk_format};
use crate::image::{ImageInner, Memory};
use ash::vk;
use smithay::backend::allocator::dmabuf::{Dmabuf, DmabufFlags};
use smithay::backend::allocator::format::FormatSet;
use smithay::backend::allocator::{Allocator, Buffer, Format, Fourcc, Modifier};
use std::os::fd::{AsRawFd, FromRawFd, IntoRawFd, OwnedFd};
use std::sync::Arc;

/// Which (format, modifier) pairs the device can import for sampling and
/// render into, queried once at startup.
#[derive(Debug, Default)]
pub(crate) struct DmabufCaps {
    pub sample: FormatSet,
    pub render: FormatSet,
}

pub(crate) const RENDER_USAGE: vk::ImageUsageFlags = vk::ImageUsageFlags::from_raw(
    vk::ImageUsageFlags::COLOR_ATTACHMENT.as_raw()
        | vk::ImageUsageFlags::SAMPLED.as_raw()
        | vk::ImageUsageFlags::TRANSFER_SRC.as_raw(),
);
pub(crate) const SAMPLE_USAGE: vk::ImageUsageFlags = vk::ImageUsageFlags::SAMPLED;

impl DmabufCaps {
    pub fn query(shared: &Shared) -> Self {
        if shared.device.dmabuf.is_none() {
            return Self::default();
        }
        let (mut sample, mut render) = (Vec::new(), Vec::new());
        for fourcc in SUPPORTED {
            let Some(fmt) = vk_format(fourcc) else {
                continue;
            };
            for props in modifier_properties(shared, fmt.format) {
                if props.drm_format_modifier_plane_count != 1 {
                    continue;
                }
                let features = props.drm_format_modifier_tiling_features;
                let format = Format {
                    code: fourcc,
                    modifier: Modifier::from(props.drm_format_modifier),
                };
                let supports =
                    |usage| external_support(shared, fmt.format, props.drm_format_modifier, usage);
                if features.contains(vk::FormatFeatureFlags::SAMPLED_IMAGE)
                    && supports(SAMPLE_USAGE).importable
                {
                    sample.push(format);
                }
                let renderable = vk::FormatFeatureFlags::COLOR_ATTACHMENT
                    | vk::FormatFeatureFlags::COLOR_ATTACHMENT_BLEND;
                let s = supports(RENDER_USAGE);
                if features.contains(renderable) && s.importable && s.exportable {
                    render.push(format);
                }
            }
        }
        Self {
            sample: sample.into_iter().collect(),
            render: render.into_iter().collect(),
        }
    }
}

fn modifier_properties(
    shared: &Shared,
    format: vk::Format,
) -> Vec<vk::DrmFormatModifierPropertiesEXT> {
    let dev = &shared.device;
    let mut list = vk::DrmFormatModifierPropertiesListEXT::default();
    let mut props = vk::FormatProperties2::default().push_next(&mut list);
    unsafe {
        dev.instance
            .get_physical_device_format_properties2(dev.physical, format, &mut props)
    };
    let count = list.drm_format_modifier_count as usize;
    let mut out = vec![vk::DrmFormatModifierPropertiesEXT::default(); count];
    let mut list =
        vk::DrmFormatModifierPropertiesListEXT::default().drm_format_modifier_properties(&mut out);
    let mut props = vk::FormatProperties2::default().push_next(&mut list);
    unsafe {
        dev.instance
            .get_physical_device_format_properties2(dev.physical, format, &mut props)
    };
    out
}

struct External {
    importable: bool,
    exportable: bool,
}

fn external_support(
    shared: &Shared,
    format: vk::Format,
    modifier: u64,
    usage: vk::ImageUsageFlags,
) -> External {
    let dev = &shared.device;
    let mut modifier_info = vk::PhysicalDeviceImageDrmFormatModifierInfoEXT::default()
        .drm_format_modifier(modifier)
        .sharing_mode(vk::SharingMode::EXCLUSIVE);
    let mut external_info = vk::PhysicalDeviceExternalImageFormatInfo::default()
        .handle_type(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
    let info = vk::PhysicalDeviceImageFormatInfo2::default()
        .format(format)
        .ty(vk::ImageType::TYPE_2D)
        .tiling(vk::ImageTiling::DRM_FORMAT_MODIFIER_EXT)
        .usage(usage)
        .push_next(&mut external_info)
        .push_next(&mut modifier_info);
    let mut external_props = vk::ExternalImageFormatProperties::default();
    let mut props = vk::ImageFormatProperties2::default().push_next(&mut external_props);
    let ok = unsafe {
        dev.instance
            .get_physical_device_image_format_properties2(dev.physical, &info, &mut props)
    }
    .is_ok();
    let features = external_props
        .external_memory_properties
        .external_memory_features;
    External {
        importable: ok && features.contains(vk::ExternalMemoryFeatureFlags::IMPORTABLE),
        exportable: ok && features.contains(vk::ExternalMemoryFeatureFlags::EXPORTABLE),
    }
}

fn memory_type(shared: &Shared, bits: u32, prefer: vk::MemoryPropertyFlags) -> Option<u32> {
    let props = unsafe {
        shared
            .device
            .instance
            .get_physical_device_memory_properties(shared.device.physical)
    };
    let types = &props.memory_types[..props.memory_type_count as usize];
    let allowed = |i: usize| bits & (1 << i) != 0;
    (0..types.len())
        .find(|&i| allowed(i) && types[i].property_flags.contains(prefer))
        .or_else(|| (0..types.len()).find(|&i| allowed(i)))
        .map(|i| i as u32)
}

fn image_info<'a>(
    fourcc: Fourcc,
    size: (u32, u32),
    usage: vk::ImageUsageFlags,
) -> Result<vk::ImageCreateInfo<'a>, Error> {
    let fmt = vk_format(fourcc).ok_or(Error::UnsupportedFormat(fourcc))?;
    Ok(vk::ImageCreateInfo::default()
        .image_type(vk::ImageType::TYPE_2D)
        .format(fmt.format)
        .extent(vk::Extent3D {
            width: size.0,
            height: size.1,
            depth: 1,
        })
        .mip_levels(1)
        .array_layers(1)
        .samples(vk::SampleCountFlags::TYPE_1)
        .tiling(vk::ImageTiling::DRM_FORMAT_MODIFIER_EXT)
        .usage(usage)
        .sharing_mode(vk::SharingMode::EXCLUSIVE)
        .initial_layout(vk::ImageLayout::UNDEFINED))
}

/// Imports a single-plane dmabuf as an image, without copying.
pub(crate) fn import(
    shared: &Arc<Shared>,
    caps: &DmabufCaps,
    dmabuf: &Dmabuf,
    usage: vk::ImageUsageFlags,
) -> Result<Arc<ImageInner>, Error> {
    let ext = shared
        .device
        .dmabuf
        .as_ref()
        .ok_or(Error::DmabufUnsupported)?;
    let format = dmabuf.format();
    let set = if usage.contains(vk::ImageUsageFlags::COLOR_ATTACHMENT) {
        &caps.render
    } else {
        &caps.sample
    };
    if dmabuf.num_planes() != 1 || !set.contains(&format) {
        return Err(Error::UnsupportedDmabuf(format));
    }
    let (Some(fd), Some(offset), Some(stride)) = (
        dmabuf.handles().next(),
        dmabuf.offsets().next(),
        dmabuf.strides().next(),
    ) else {
        return Err(Error::UnsupportedDmabuf(format));
    };
    let size = (dmabuf.width(), dmabuf.height());
    let d = &shared.device.device;
    let layouts = [vk::SubresourceLayout {
        offset: u64::from(offset),
        size: 0,
        row_pitch: u64::from(stride),
        array_pitch: 0,
        depth_pitch: 0,
    }];
    let mut explicit = vk::ImageDrmFormatModifierExplicitCreateInfoEXT::default()
        .drm_format_modifier(u64::from(format.modifier))
        .plane_layouts(&layouts);
    let mut external = vk::ExternalMemoryImageCreateInfo::default()
        .handle_types(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
    let info = image_info(format.code, size, usage)?
        .push_next(&mut external)
        .push_next(&mut explicit);
    let image = unsafe { d.create_image(&info, None)? };
    let destroy = || unsafe { d.destroy_image(image, None) };
    let owned = match fd.try_clone_to_owned() {
        Ok(o) => o,
        Err(_) => {
            destroy();
            return Err(Error::UnsupportedDmabuf(format));
        }
    };
    let mut fd_props = vk::MemoryFdPropertiesKHR::default();
    if let Err(e) = unsafe {
        ext.memory_fd.get_memory_fd_properties(
            vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT,
            owned.as_raw_fd(),
            &mut fd_props,
        )
    } {
        destroy();
        return Err(e.into());
    }
    let requirements = unsafe { d.get_image_memory_requirements(image) };
    let Some(type_index) = memory_type(
        shared,
        requirements.memory_type_bits & fd_props.memory_type_bits,
        vk::MemoryPropertyFlags::empty(),
    ) else {
        destroy();
        return Err(Error::UnsupportedDmabuf(format));
    };
    let raw = owned.into_raw_fd();
    let mut import = vk::ImportMemoryFdInfoKHR::default()
        .handle_type(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT)
        .fd(raw);
    let mut dedicated = vk::MemoryDedicatedAllocateInfo::default().image(image);
    let alloc = vk::MemoryAllocateInfo::default()
        .allocation_size(requirements.size)
        .memory_type_index(type_index)
        .push_next(&mut import)
        .push_next(&mut dedicated);
    let memory = match unsafe { d.allocate_memory(&alloc, None) } {
        Ok(m) => m,
        Err(e) => {
            // SAFETY: a failed import leaves the fd with us, per
            // VK_KHR_external_memory_fd.
            drop(unsafe { OwnedFd::from_raw_fd(raw) });
            destroy();
            return Err(e.into());
        }
    };
    ImageInner::finish(
        shared,
        image,
        Memory::Imported(memory),
        memory,
        0,
        format.code,
        size.0,
        size.1,
        usage,
        true,
        dmabuf.y_inverted(),
    )
}

/// Allocates a dmabuf the device can render into, picking among `modifiers`.
pub(crate) fn export(
    shared: &Arc<Shared>,
    caps: &DmabufCaps,
    fourcc: Fourcc,
    size: (u32, u32),
    modifiers: &[Modifier],
) -> Result<Dmabuf, Error> {
    let ext = shared
        .device
        .dmabuf
        .as_ref()
        .ok_or(Error::DmabufUnsupported)?;
    let allowed: Vec<u64> = modifiers
        .iter()
        .filter(|&&modifier| {
            caps.render.contains(&Format {
                code: fourcc,
                modifier,
            })
        })
        .map(|&m| u64::from(m))
        .collect();
    if allowed.is_empty() {
        return Err(Error::UnsupportedFormat(fourcc));
    }
    let d = &shared.device.device;
    let mut list =
        vk::ImageDrmFormatModifierListCreateInfoEXT::default().drm_format_modifiers(&allowed);
    let mut external = vk::ExternalMemoryImageCreateInfo::default()
        .handle_types(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
    let info = image_info(fourcc, size, RENDER_USAGE)?
        .push_next(&mut external)
        .push_next(&mut list);
    let image = unsafe { d.create_image(&info, None)? };
    let result = (|| -> Result<Dmabuf, Error> {
        let requirements = unsafe { d.get_image_memory_requirements(image) };
        let type_index = memory_type(
            shared,
            requirements.memory_type_bits,
            vk::MemoryPropertyFlags::DEVICE_LOCAL,
        )
        .ok_or(Error::UnsupportedFormat(fourcc))?;
        let mut export = vk::ExportMemoryAllocateInfo::default()
            .handle_types(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
        let mut dedicated = vk::MemoryDedicatedAllocateInfo::default().image(image);
        let alloc = vk::MemoryAllocateInfo::default()
            .allocation_size(requirements.size)
            .memory_type_index(type_index)
            .push_next(&mut export)
            .push_next(&mut dedicated);
        let memory = unsafe { d.allocate_memory(&alloc, None)? };
        let exported = (|| -> Result<Dmabuf, Error> {
            unsafe { d.bind_image_memory(image, memory, 0)? };
            let raw = unsafe {
                ext.memory_fd.get_memory_fd(
                    &vk::MemoryGetFdInfoKHR::default()
                        .memory(memory)
                        .handle_type(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT),
                )?
            };
            // SAFETY: vkGetMemoryFdKHR hands the caller a new fd to own.
            let fd = unsafe { OwnedFd::from_raw_fd(raw) };
            let mut props = vk::ImageDrmFormatModifierPropertiesEXT::default();
            unsafe {
                ext.modifier
                    .get_image_drm_format_modifier_properties(image, &mut props)?
            };
            let layout = unsafe {
                d.get_image_subresource_layout(
                    image,
                    vk::ImageSubresource::default()
                        .aspect_mask(vk::ImageAspectFlags::MEMORY_PLANE_0_EXT),
                )
            };
            let mut builder = Dmabuf::builder(
                (size.0 as i32, size.1 as i32),
                fourcc,
                Modifier::from(props.drm_format_modifier),
                DmabufFlags::empty(),
            );
            builder.add_plane(fd, layout.offset as u32, layout.row_pitch as u32);
            builder.build().ok_or(Error::UnsupportedFormat(fourcc))
        })();
        unsafe { d.free_memory(memory, None) };
        exported
    })();
    unsafe { d.destroy_image(image, None) };
    result
}

/// Allocates render-capable dmabufs, for swapchains.
#[derive(Clone, Debug)]
pub struct VulkanAllocator {
    pub(crate) shared: Arc<Shared>,
    pub(crate) caps: Arc<DmabufCaps>,
}

impl Allocator for VulkanAllocator {
    type Buffer = Dmabuf;
    type Error = Error;

    fn create_buffer(
        &mut self,
        width: u32,
        height: u32,
        fourcc: Fourcc,
        modifiers: &[Modifier],
    ) -> Result<Dmabuf, Error> {
        export(&self.shared, &self.caps, fourcc, (width, height), modifiers)
    }
}

impl std::fmt::Debug for Shared {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Shared")
            .field("device", &self.device.name)
            .finish()
    }
}

1	use crate::Error;
2	use crate::device::Shared;
3	use crate::format::{SUPPORTED, vk_format};
4	use crate::image::{ImageInner, Memory};
5	use ash::vk;
6	use smithay::backend::allocator::dmabuf::{Dmabuf, DmabufFlags};
7	use smithay::backend::allocator::format::FormatSet;
8	use smithay::backend::allocator::{Allocator, Buffer, Format, Fourcc, Modifier};
9	use std::os::fd::{AsRawFd, FromRawFd, IntoRawFd, OwnedFd};
10	use std::sync::Arc;
11
12	/// Which (format, modifier) pairs the device can import for sampling and
13	/// render into, queried once at startup.
14	#[derive(Debug, Default)]
15	pub(crate) struct DmabufCaps {
16	pub sample: FormatSet,
17	pub render: FormatSet,
18	}
19
20	pub(crate) const RENDER_USAGE: vk::ImageUsageFlags = vk::ImageUsageFlags::from_raw(
21	vk::ImageUsageFlags::COLOR_ATTACHMENT.as_raw()
22	\| vk::ImageUsageFlags::SAMPLED.as_raw()
23	\| vk::ImageUsageFlags::TRANSFER_SRC.as_raw(),
24	);
25	pub(crate) const SAMPLE_USAGE: vk::ImageUsageFlags = vk::ImageUsageFlags::SAMPLED;
26
27	impl DmabufCaps {
28	pub fn query(shared: &Shared) -> Self {
29	if shared.device.dmabuf.is_none() {
30	return Self::default();
31	}
32	let (mut sample, mut render) = (Vec::new(), Vec::new());
33	for fourcc in SUPPORTED {
34	let Some(fmt) = vk_format(fourcc) else {
35	continue;
36	};
37	for props in modifier_properties(shared, fmt.format) {
38	if props.drm_format_modifier_plane_count != 1 {
39	continue;
40	}
41	let features = props.drm_format_modifier_tiling_features;
42	let format = Format {
43	code: fourcc,
44	modifier: Modifier::from(props.drm_format_modifier),
45	};
46	let supports =
47	\|usage\| external_support(shared, fmt.format, props.drm_format_modifier, usage);
48	if features.contains(vk::FormatFeatureFlags::SAMPLED_IMAGE)
49	&& supports(SAMPLE_USAGE).importable
50	{
51	sample.push(format);
52	}
53	let renderable = vk::FormatFeatureFlags::COLOR_ATTACHMENT
54	\| vk::FormatFeatureFlags::COLOR_ATTACHMENT_BLEND;
55	let s = supports(RENDER_USAGE);
56	if features.contains(renderable) && s.importable && s.exportable {
57	render.push(format);
58	}
59	}
60	}
61	Self {
62	sample: sample.into_iter().collect(),
63	render: render.into_iter().collect(),
64	}
65	}
66	}
67
68	fn modifier_properties(
69	shared: &Shared,
70	format: vk::Format,
71	) -> Vec<vk::DrmFormatModifierPropertiesEXT> {
72	let dev = &shared.device;
73	let mut list = vk::DrmFormatModifierPropertiesListEXT::default();
74	let mut props = vk::FormatProperties2::default().push_next(&mut list);
75	unsafe {
76	dev.instance
77	.get_physical_device_format_properties2(dev.physical, format, &mut props)
78	};
79	let count = list.drm_format_modifier_count as usize;
80	let mut out = vec![vk::DrmFormatModifierPropertiesEXT::default(); count];
81	let mut list =
82	vk::DrmFormatModifierPropertiesListEXT::default().drm_format_modifier_properties(&mut out);
83	let mut props = vk::FormatProperties2::default().push_next(&mut list);
84	unsafe {
85	dev.instance
86	.get_physical_device_format_properties2(dev.physical, format, &mut props)
87	};
88	out
89	}
90
91	struct External {
92	importable: bool,
93	exportable: bool,
94	}
95
96	fn external_support(
97	shared: &Shared,
98	format: vk::Format,
99	modifier: u64,
100	usage: vk::ImageUsageFlags,
101	) -> External {
102	let dev = &shared.device;
103	let mut modifier_info = vk::PhysicalDeviceImageDrmFormatModifierInfoEXT::default()
104	.drm_format_modifier(modifier)
105	.sharing_mode(vk::SharingMode::EXCLUSIVE);
106	let mut external_info = vk::PhysicalDeviceExternalImageFormatInfo::default()
107	.handle_type(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
108	let info = vk::PhysicalDeviceImageFormatInfo2::default()
109	.format(format)
110	.ty(vk::ImageType::TYPE_2D)
111	.tiling(vk::ImageTiling::DRM_FORMAT_MODIFIER_EXT)
112	.usage(usage)
113	.push_next(&mut external_info)
114	.push_next(&mut modifier_info);
115	let mut external_props = vk::ExternalImageFormatProperties::default();
116	let mut props = vk::ImageFormatProperties2::default().push_next(&mut external_props);
117	let ok = unsafe {
118	dev.instance
119	.get_physical_device_image_format_properties2(dev.physical, &info, &mut props)
120	}
121	.is_ok();
122	let features = external_props
123	.external_memory_properties
124	.external_memory_features;
125	External {
126	importable: ok && features.contains(vk::ExternalMemoryFeatureFlags::IMPORTABLE),
127	exportable: ok && features.contains(vk::ExternalMemoryFeatureFlags::EXPORTABLE),
128	}
129	}
130
131	fn memory_type(shared: &Shared, bits: u32, prefer: vk::MemoryPropertyFlags) -> Option<u32> {
132	let props = unsafe {
133	shared
134	.device
135	.instance
136	.get_physical_device_memory_properties(shared.device.physical)
137	};
138	let types = &props.memory_types[..props.memory_type_count as usize];
139	let allowed = \|i: usize\| bits & (1 << i) != 0;
140	(0..types.len())
141	.find(\|&i\| allowed(i) && types[i].property_flags.contains(prefer))
142	.or_else(\|\| (0..types.len()).find(\|&i\| allowed(i)))
143	.map(\|i\| i as u32)
144	}
145
146	fn image_info<'a>(
147	fourcc: Fourcc,
148	size: (u32, u32),
149	usage: vk::ImageUsageFlags,
150	) -> Result<vk::ImageCreateInfo<'a>, Error> {
151	let fmt = vk_format(fourcc).ok_or(Error::UnsupportedFormat(fourcc))?;
152	Ok(vk::ImageCreateInfo::default()
153	.image_type(vk::ImageType::TYPE_2D)
154	.format(fmt.format)
155	.extent(vk::Extent3D {
156	width: size.0,
157	height: size.1,
158	depth: 1,
159	})
160	.mip_levels(1)
161	.array_layers(1)
162	.samples(vk::SampleCountFlags::TYPE_1)
163	.tiling(vk::ImageTiling::DRM_FORMAT_MODIFIER_EXT)
164	.usage(usage)
165	.sharing_mode(vk::SharingMode::EXCLUSIVE)
166	.initial_layout(vk::ImageLayout::UNDEFINED))
167	}
168
169	/// Imports a single-plane dmabuf as an image, without copying.
170	pub(crate) fn import(
171	shared: &Arc<Shared>,
172	caps: &DmabufCaps,
173	dmabuf: &Dmabuf,
174	usage: vk::ImageUsageFlags,
175	) -> Result<Arc<ImageInner>, Error> {
176	let ext = shared
177	.device
178	.dmabuf
179	.as_ref()
180	.ok_or(Error::DmabufUnsupported)?;
181	let format = dmabuf.format();
182	let set = if usage.contains(vk::ImageUsageFlags::COLOR_ATTACHMENT) {
183	&caps.render
184	} else {
185	&caps.sample
186	};
187	if dmabuf.num_planes() != 1 \|\| !set.contains(&format) {
188	return Err(Error::UnsupportedDmabuf(format));
189	}
190	let (Some(fd), Some(offset), Some(stride)) = (
191	dmabuf.handles().next(),
192	dmabuf.offsets().next(),
193	dmabuf.strides().next(),
194	) else {
195	return Err(Error::UnsupportedDmabuf(format));
196	};
197	let size = (dmabuf.width(), dmabuf.height());
198	let d = &shared.device.device;
199	let layouts = [vk::SubresourceLayout {
200	offset: u64::from(offset),
201	size: 0,
202	row_pitch: u64::from(stride),
203	array_pitch: 0,
204	depth_pitch: 0,
205	}];
206	let mut explicit = vk::ImageDrmFormatModifierExplicitCreateInfoEXT::default()
207	.drm_format_modifier(u64::from(format.modifier))
208	.plane_layouts(&layouts);
209	let mut external = vk::ExternalMemoryImageCreateInfo::default()
210	.handle_types(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
211	let info = image_info(format.code, size, usage)?
212	.push_next(&mut external)
213	.push_next(&mut explicit);
214	let image = unsafe { d.create_image(&info, None)? };
215	let destroy = \|\| unsafe { d.destroy_image(image, None) };
216	let owned = match fd.try_clone_to_owned() {
217	Ok(o) => o,
218	Err(_) => {
219	destroy();
220	return Err(Error::UnsupportedDmabuf(format));
221	}
222	};
223	let mut fd_props = vk::MemoryFdPropertiesKHR::default();
224	if let Err(e) = unsafe {
225	ext.memory_fd.get_memory_fd_properties(
226	vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT,
227	owned.as_raw_fd(),
228	&mut fd_props,
229	)
230	} {
231	destroy();
232	return Err(e.into());
233	}
234	let requirements = unsafe { d.get_image_memory_requirements(image) };
235	let Some(type_index) = memory_type(
236	shared,
237	requirements.memory_type_bits & fd_props.memory_type_bits,
238	vk::MemoryPropertyFlags::empty(),
239	) else {
240	destroy();
241	return Err(Error::UnsupportedDmabuf(format));
242	};
243	let raw = owned.into_raw_fd();
244	let mut import = vk::ImportMemoryFdInfoKHR::default()
245	.handle_type(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT)
246	.fd(raw);
247	let mut dedicated = vk::MemoryDedicatedAllocateInfo::default().image(image);
248	let alloc = vk::MemoryAllocateInfo::default()
249	.allocation_size(requirements.size)
250	.memory_type_index(type_index)
251	.push_next(&mut import)
252	.push_next(&mut dedicated);
253	let memory = match unsafe { d.allocate_memory(&alloc, None) } {
254	Ok(m) => m,
255	Err(e) => {
256	// SAFETY: a failed import leaves the fd with us, per
257	// VK_KHR_external_memory_fd.
258	drop(unsafe { OwnedFd::from_raw_fd(raw) });
259	destroy();
260	return Err(e.into());
261	}
262	};
263	ImageInner::finish(
264	shared,
265	image,
266	Memory::Imported(memory),
267	memory,
268	0,
269	format.code,
270	size.0,
271	size.1,
272	usage,
273	true,
274	dmabuf.y_inverted(),
275	)
276	}
277
278	/// Allocates a dmabuf the device can render into, picking among `modifiers`.
279	pub(crate) fn export(
280	shared: &Arc<Shared>,
281	caps: &DmabufCaps,
282	fourcc: Fourcc,
283	size: (u32, u32),
284	modifiers: &[Modifier],
285	) -> Result<Dmabuf, Error> {
286	let ext = shared
287	.device
288	.dmabuf
289	.as_ref()
290	.ok_or(Error::DmabufUnsupported)?;
291	let allowed: Vec<u64> = modifiers
292	.iter()
293	.filter(\|&&modifier\| {
294	caps.render.contains(&Format {
295	code: fourcc,
296	modifier,
297	})
298	})
299	.map(\|&m\| u64::from(m))
300	.collect();
301	if allowed.is_empty() {
302	return Err(Error::UnsupportedFormat(fourcc));
303	}
304	let d = &shared.device.device;
305	let mut list =
306	vk::ImageDrmFormatModifierListCreateInfoEXT::default().drm_format_modifiers(&allowed);
307	let mut external = vk::ExternalMemoryImageCreateInfo::default()
308	.handle_types(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
309	let info = image_info(fourcc, size, RENDER_USAGE)?
310	.push_next(&mut external)
311	.push_next(&mut list);
312	let image = unsafe { d.create_image(&info, None)? };
313	let result = (\|\| -> Result<Dmabuf, Error> {
314	let requirements = unsafe { d.get_image_memory_requirements(image) };
315	let type_index = memory_type(
316	shared,
317	requirements.memory_type_bits,
318	vk::MemoryPropertyFlags::DEVICE_LOCAL,
319	)
320	.ok_or(Error::UnsupportedFormat(fourcc))?;
321	let mut export = vk::ExportMemoryAllocateInfo::default()
322	.handle_types(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT);
323	let mut dedicated = vk::MemoryDedicatedAllocateInfo::default().image(image);
324	let alloc = vk::MemoryAllocateInfo::default()
325	.allocation_size(requirements.size)
326	.memory_type_index(type_index)
327	.push_next(&mut export)
328	.push_next(&mut dedicated);
329	let memory = unsafe { d.allocate_memory(&alloc, None)? };
330	let exported = (\|\| -> Result<Dmabuf, Error> {
331	unsafe { d.bind_image_memory(image, memory, 0)? };
332	let raw = unsafe {
333	ext.memory_fd.get_memory_fd(
334	&vk::MemoryGetFdInfoKHR::default()
335	.memory(memory)
336	.handle_type(vk::ExternalMemoryHandleTypeFlags::DMA_BUF_EXT),
337	)?
338	};
339	// SAFETY: vkGetMemoryFdKHR hands the caller a new fd to own.
340	let fd = unsafe { OwnedFd::from_raw_fd(raw) };
341	let mut props = vk::ImageDrmFormatModifierPropertiesEXT::default();
342	unsafe {
343	ext.modifier
344	.get_image_drm_format_modifier_properties(image, &mut props)?
345	};
346	let layout = unsafe {
347	d.get_image_subresource_layout(
348	image,
349	vk::ImageSubresource::default()
350	.aspect_mask(vk::ImageAspectFlags::MEMORY_PLANE_0_EXT),
351	)
352	};
353	let mut builder = Dmabuf::builder(
354	(size.0 as i32, size.1 as i32),
355	fourcc,
356	Modifier::from(props.drm_format_modifier),
357	DmabufFlags::empty(),
358	);
359	builder.add_plane(fd, layout.offset as u32, layout.row_pitch as u32);
360	builder.build().ok_or(Error::UnsupportedFormat(fourcc))
361	})();
362	unsafe { d.free_memory(memory, None) };
363	exported
364	})();
365	unsafe { d.destroy_image(image, None) };
366	result
367	}
368
369	/// Allocates render-capable dmabufs, for swapchains.
370	#[derive(Clone, Debug)]
371	pub struct VulkanAllocator {
372	pub(crate) shared: Arc<Shared>,
373	pub(crate) caps: Arc<DmabufCaps>,
374	}
375
376	impl Allocator for VulkanAllocator {
377	type Buffer = Dmabuf;
378	type Error = Error;
379
380	fn create_buffer(
381	&mut self,
382	width: u32,
383	height: u32,
384	fourcc: Fourcc,
385	modifiers: &[Modifier],
386	) -> Result<Dmabuf, Error> {
387	export(&self.shared, &self.caps, fourcc, (width, height), modifiers)
388	}
389	}
390
391	impl std::fmt::Debug for Shared {
392	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
393	f.debug_struct("Shared")
394	.field("device", &self.device.name)
395	.finish()
396	}
397	}