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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 smallvec::SmallVec;
    use std::error;
    use std::fmt;
    use std::marker::PhantomData;
    use std::mem;
    use std::ptr;
    use std::sync::Arc;
    use std::sync::Mutex;

    use device::Device;
    use device::DeviceOwned;
    use format::ClearValue;
    use framebuffer::EmptySinglePassRenderPassDesc;
    use framebuffer::AttachmentDescription;
    use framebuffer::PassDependencyDescription;
    use framebuffer::PassDescription;
    use framebuffer::LoadOp;
    use framebuffer::RenderPassAbstract;
    use framebuffer::RenderPassDesc;
    use framebuffer::RenderPassDescClearValues;

    use Error;
    use OomError;
    use VulkanObject;
    use check_errors;
    use vk;

    /// Defines the layout of multiple subpasses.
    ///
    /// The `RenderPass` struct should always implement the `RenderPassAbstract` trait. Therefore
    /// you can turn any `Arc<RenderPass<D>>` into a `Arc<RenderPassAbstract + Send + Sync>` if you need to.
    pub struct RenderPass<D> {
        // The internal Vulkan object.
        render_pass: vk::RenderPass,

        // Device this render pass was created from.
        device: Arc<Device>,

        // Description of the render pass.
        desc: D,

        // Cache of the granularity of the render pass.
        granularity: Mutex<Option<[u32; 2]>>,
    }

    impl<D> RenderPass<D>
        where D: RenderPassDesc
    {
        /// Builds a new render pass.
        ///
        /// # Panic
        ///
        /// - Can panic if it detects some violations in the restrictions. Only inexpensive checks are
        /// performed. `debug_assert!` is used, so some restrictions are only checked in debug
        /// mode.
        ///
        pub fn new(device: Arc<Device>, description: D)
                   -> Result<RenderPass<D>, RenderPassCreationError> {
            let vk = device.pointers();

            // If the first use of an attachment in this render pass is as an input attachment, and
            // the attachment is not also used as a color or depth/stencil attachment in the same
            // subpass, then loadOp must not be VK_ATTACHMENT_LOAD_OP_CLEAR
            debug_assert!(description.attachment_descs().enumerate().all(|(atch_num,
              attachment)| {
                if attachment.load != LoadOp::Clear {
                    return true;
                }

                for p in description.subpass_descs() {
                    if p.color_attachments
                        .iter()
                        .find(|&&(a, _)| a == atch_num)
                        .is_some()
                    {
                        return true;
                    }
                    if let Some((a, _)) = p.depth_stencil {
                        if a == atch_num {
                            return true;
                        }
                    }
                    if p.input_attachments
                        .iter()
                        .find(|&&(a, _)| a == atch_num)
                        .is_some()
                    {
                        return false;
                    }
                }

                true
            }));

            let attachments = description
                .attachment_descs()
                .map(|attachment| {
                    debug_assert!(attachment.samples.is_power_of_two());

                    vk::AttachmentDescription {
                        flags: 0, // FIXME: may alias flag
                        format: attachment.format as u32,
                        samples: attachment.samples,
                        loadOp: attachment.load as u32,
                        storeOp: attachment.store as u32,
                        stencilLoadOp: attachment.stencil_load as u32,
                        stencilStoreOp: attachment.stencil_store as u32,
                        initialLayout: attachment.initial_layout as u32,
                        finalLayout: attachment.final_layout as u32,
                    }
                })
                .collect::<SmallVec<[_; 16]>>();

            // We need to pass pointers to vkAttachmentReference structs when creating the render pass.
            // Therefore we need to allocate them in advance.
            //
            // This block allocates, for each pass, in order, all color attachment references, then all
            // input attachment references, then all resolve attachment references, then the depth
            // stencil attachment reference.
            let attachment_references = description
                .subpass_descs()
                .flat_map(|pass| {
                    // Performing some validation with debug asserts.
                    debug_assert!(pass.resolve_attachments.is_empty() ||
                                      pass.resolve_attachments.len() == pass.color_attachments.len());
                    debug_assert!(pass.resolve_attachments
                                      .iter()
                                      .all(|a| attachments[a.0].samples == 1));
                    debug_assert!(pass.resolve_attachments.is_empty() ||
                                      pass.color_attachments
                                          .iter()
                                          .all(|a| attachments[a.0].samples > 1));
                    debug_assert!(pass.resolve_attachments.is_empty() ||
                                      pass.resolve_attachments
                                          .iter()
                                          .zip(pass.color_attachments.iter())
                                          .all(|(r, c)| {
                                                   attachments[r.0].format == attachments[c.0].format
                                               }));
                    debug_assert!(pass.color_attachments
                                      .iter()
                                      .cloned()
                                      .chain(pass.depth_stencil.clone().into_iter())
                                      .chain(pass.input_attachments.iter().cloned())
                                      .chain(pass.resolve_attachments.iter().cloned())
                                      .all(|(a, _)| {
                                               pass.preserve_attachments
                                                   .iter()
                                                   .find(|&&b| a == b)
                                                   .is_none()
                                           }));
                    debug_assert!(
                        pass.color_attachments
                            .iter()
                            .cloned()
                            .chain(pass.depth_stencil.clone().into_iter())
                            .all(|(atch, layout)| if let Some(r) =
                                pass.input_attachments.iter().find(|r| r.0 == atch)
                            {
                                r.1 == layout
                            } else {
                                true
                            })
                    );

                    let resolve = pass.resolve_attachments
                        .into_iter()
                        .map(|(offset, img_la)| {
                                 debug_assert!(offset < attachments.len());
                                 vk::AttachmentReference {
                                     attachment: offset as u32,
                                     layout: img_la as u32,
                                 }
                             });

                    let color = pass.color_attachments.into_iter().map(|(offset, img_la)| {
                        debug_assert!(offset < attachments.len());
                        vk::AttachmentReference {
                            attachment: offset as u32,
                            layout: img_la as u32,
                        }
                    });

                    let input = pass.input_attachments.into_iter().map(|(offset, img_la)| {
                        debug_assert!(offset < attachments.len());
                        vk::AttachmentReference {
                            attachment: offset as u32,
                            layout: img_la as u32,
                        }
                    });

                    let depthstencil = if let Some((offset, img_la)) = pass.depth_stencil {
                        Some(vk::AttachmentReference {
                                 attachment: offset as u32,
                                 layout: img_la as u32,
                             })
                    } else {
                        None
                    }.into_iter();

                    color.chain(input).chain(resolve).chain(depthstencil)
                })
                .collect::<SmallVec<[_; 16]>>();

            // Same as `attachment_references` but only for the preserve attachments.
            // This is separate because attachment references are u32s and not `vkAttachmentReference`
            // structs.
            let preserve_attachments_references = description
                .subpass_descs()
                .flat_map(|pass| {
                              pass.preserve_attachments
                                  .into_iter()
                                  .map(|offset| offset as u32)
                          })
                .collect::<SmallVec<[_; 16]>>();

            // Now iterating over passes.
            let passes = unsafe {
                // `ref_index` and `preserve_ref_index` are increased during the loop and point to the
                // next element to use in respectively `attachment_references` and
                // `preserve_attachments_references`.
                let mut ref_index = 0usize;
                let mut preserve_ref_index = 0usize;
                let mut out: SmallVec<[_; 16]> = SmallVec::new();

                for pass in description.subpass_descs() {
                    if pass.color_attachments.len() as u32 >
                        device.physical_device().limits().max_color_attachments()
                    {
                        return Err(RenderPassCreationError::ColorAttachmentsLimitExceeded);
                    }

                    let color_attachments = attachment_references.as_ptr().offset(ref_index as isize);
                    ref_index += pass.color_attachments.len();
                    let input_attachments = attachment_references.as_ptr().offset(ref_index as isize);
                    ref_index += pass.input_attachments.len();
                    let resolve_attachments = attachment_references.as_ptr().offset(ref_index as isize);
                    ref_index += pass.resolve_attachments.len();
                    let depth_stencil = if pass.depth_stencil.is_some() {
                        let a = attachment_references.as_ptr().offset(ref_index as isize);
                        ref_index += 1;
                        a
                    } else {
                        ptr::null()
                    };

                    let preserve_attachments = preserve_attachments_references
                        .as_ptr()
                        .offset(preserve_ref_index as isize);
                    preserve_ref_index += pass.preserve_attachments.len();

                    out.push(vk::SubpassDescription {
                                 flags: 0, // reserved
                                 pipelineBindPoint: vk::PIPELINE_BIND_POINT_GRAPHICS,
                                 inputAttachmentCount: pass.input_attachments.len() as u32,
                                 pInputAttachments: if pass.input_attachments.is_empty() {
                                     ptr::null()
                                 } else {
                                     input_attachments
                                 },
                                 colorAttachmentCount: pass.color_attachments.len() as u32,
                                 pColorAttachments: if pass.color_attachments.is_empty() {
                                     ptr::null()
                                 } else {
                                     color_attachments
                                 },
                                 pResolveAttachments: if pass.resolve_attachments.is_empty() {
                                     ptr::null()
                                 } else {
                                     resolve_attachments
                                 },
                                 pDepthStencilAttachment: depth_stencil,
                                 preserveAttachmentCount: pass.preserve_attachments.len() as u32,
                                 pPreserveAttachments: if pass.preserve_attachments.is_empty() {
                                     ptr::null()
                                 } else {
                                     preserve_attachments
                                 },
                             });
                }

                assert!(!out.is_empty());
                // If these assertions fails, there's a serious bug in the code above ^.
                debug_assert!(ref_index == attachment_references.len());
                debug_assert!(preserve_ref_index == preserve_attachments_references.len());

                out
            };

            let dependencies = description
                .dependency_descs()
                .map(|dependency| {
                    debug_assert!(dependency.source_subpass as u32 == vk::SUBPASS_EXTERNAL || dependency.source_subpass < passes.len());
                    debug_assert!(dependency.destination_subpass as u32 == vk::SUBPASS_EXTERNAL || dependency.destination_subpass < passes.len());

                    vk::SubpassDependency {
                        srcSubpass: dependency.source_subpass as u32,
                        dstSubpass: dependency.destination_subpass as u32,
                        srcStageMask: dependency.source_stages.into_vulkan_bits(),
                        dstStageMask: dependency.destination_stages.into_vulkan_bits(),
                        srcAccessMask: dependency.source_access.into_vulkan_bits(),
                        dstAccessMask: dependency.destination_access.into_vulkan_bits(),
                        dependencyFlags: if dependency.by_region {
                            vk::DEPENDENCY_BY_REGION_BIT
                        } else {
                            0
                        },
                    }
                })
                .collect::<SmallVec<[_; 16]>>();

            let render_pass = unsafe {
                let infos = vk::RenderPassCreateInfo {
                    sType: vk::STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO,
                    pNext: ptr::null(),
                    flags: 0, // reserved
                    attachmentCount: attachments.len() as u32,
                    pAttachments: if attachments.is_empty() {
                        ptr::null()
                    } else {
                        attachments.as_ptr()
                    },
                    subpassCount: passes.len() as u32,
                    pSubpasses: if passes.is_empty() {
                        ptr::null()
                    } else {
                        passes.as_ptr()
                    },
                    dependencyCount: dependencies.len() as u32,
                    pDependencies: if dependencies.is_empty() {
                        ptr::null()
                    } else {
                        dependencies.as_ptr()
                    },
                };

                let mut output = mem::uninitialized();
                check_errors(vk.CreateRenderPass(device.internal_object(),
                                                 &infos,
                                                 ptr::null(),
                                                 &mut output))?;
                output
            };

            Ok(RenderPass {
                   device: device.clone(),
                   render_pass: render_pass,
                   desc: description,
                   granularity: Mutex::new(None),
               })
        }
    }

    impl RenderPass<EmptySinglePassRenderPassDesc> {
        /// Builds a render pass with one subpass and no attachment.
        ///
        /// This method is useful for quick tests.
        #[inline]
        pub fn empty_single_pass(
            device: Arc<Device>)
            -> Result<RenderPass<EmptySinglePassRenderPassDesc>, RenderPassCreationError> {
            RenderPass::new(device, EmptySinglePassRenderPassDesc)
        }
    }

    impl<D> RenderPass<D> {
        /// Returns the granularity of this render pass.
        ///
        /// If the render area of a render pass in a command buffer is a multiple of this granularity,
        /// then the performance will be optimal. Performances are always optimal for render areas
        /// that cover the whole framebuffer.
        pub fn granularity(&self) -> [u32; 2] {
            let mut granularity = self.granularity.lock().unwrap();

            if let Some(&granularity) = granularity.as_ref() {
                return granularity;
            }

            unsafe {
                let vk = self.device.pointers();
                let mut out = mem::uninitialized();
                vk.GetRenderAreaGranularity(self.device.internal_object(), self.render_pass, &mut out);

                debug_assert_ne!(out.width, 0);
                debug_assert_ne!(out.height, 0);
                let gran = [out.width, out.height];
                *granularity = Some(gran);
                gran
            }
        }

        /// Returns the description of the render pass.
        ///
        /// > **Note**: You must not somehow modify the description. This shouldn't be possible anyway
        /// > if `RenderPassDesc` was implemented correctly.
        #[inline]
        pub fn desc(&self) -> &D {
            &self.desc
        }
    }

    unsafe impl<D> RenderPassDesc for RenderPass<D>
        where D: RenderPassDesc
    {
        #[inline]
        fn num_attachments(&self) -> usize {
            self.desc.num_attachments()
        }

        #[inline]
        fn attachment_desc(&self, num: usize) -> Option<AttachmentDescription> {
            self.desc.attachment_desc(num)
        }

        #[inline]
        fn num_subpasses(&self) -> usize {
            self.desc.num_subpasses()
        }

        #[inline]
        fn subpass_desc(&self, num: usize) -> Option<PassDescription> {
            self.desc.subpass_desc(num)
        }

        #[inline]
        fn num_dependencies(&self) -> usize {
            self.desc.num_dependencies()
        }

        #[inline]
        fn dependency_desc(&self, num: usize) -> Option<PassDependencyDescription> {
            self.desc.dependency_desc(num)
        }
    }

    unsafe impl<C, D> RenderPassDescClearValues<C> for RenderPass<D>
        where D: RenderPassDescClearValues<C>
    {
        #[inline]
        fn convert_clear_values(&self, vals: C) -> Box<dyn Iterator<Item = ClearValue>> {
            self.desc.convert_clear_values(vals)
        }
    }

    unsafe impl<D> RenderPassAbstract for RenderPass<D>
        where D: RenderPassDesc
    {
        #[inline]
        fn inner(&self) -> RenderPassSys {
            RenderPassSys(self.render_pass, PhantomData)
        }
    }

    unsafe impl<D> DeviceOwned for RenderPass<D> {
        #[inline]
        fn device(&self) -> &Arc<Device> {
            &self.device
        }
    }

    impl<D> fmt::Debug for RenderPass<D>
        where D: fmt::Debug
    {
        fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
            fmt.debug_struct("RenderPass")
                .field("raw", &self.render_pass)
                .field("device", &self.device)
                .field("desc", &self.desc)
                .finish()
        }
    }

    impl<D> Drop for RenderPass<D> {
        #[inline]
        fn drop(&mut self) {
            unsafe {
                let vk = self.device.pointers();
                vk.DestroyRenderPass(self.device.internal_object(), self.render_pass, ptr::null());
            }
        }
    }

    /// Opaque object that represents the render pass' internals.
    #[derive(Debug, Copy, Clone)]
    pub struct RenderPassSys<'a>(vk::RenderPass, PhantomData<&'a ()>);

    unsafe impl<'a> VulkanObject for RenderPassSys<'a> {
        type Object = vk::RenderPass;

        const TYPE: vk::DebugReportObjectTypeEXT = vk::DEBUG_REPORT_OBJECT_TYPE_RENDER_PASS_EXT;

        #[inline]
        fn internal_object(&self) -> vk::RenderPass {
            self.0
        }
    }

    /// Error that can happen when creating a compute pipeline.
    #[derive(Clone, Debug, PartialEq, Eq)]
    pub enum RenderPassCreationError {
        /// Not enough memory.
        OomError(OomError),
        /// The maximum number of color attachments has been exceeded.
        ColorAttachmentsLimitExceeded,
    }

    impl error::Error for RenderPassCreationError {
        #[inline]
        fn description(&self) -> &str {
            match *self {
                RenderPassCreationError::OomError(_) => "not enough memory available",
                RenderPassCreationError::ColorAttachmentsLimitExceeded => {
                    "the maximum number of color attachments has been exceeded"
                },
            }
        }

        #[inline]
        fn cause(&self) -> Option<&dyn error::Error> {
            match *self {
                RenderPassCreationError::OomError(ref err) => Some(err),
                _ => None,
            }
        }
    }

    impl fmt::Display for RenderPassCreationError {
        #[inline]
        fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
            write!(fmt, "{}", error::Error::description(self))
        }
    }

    impl From<OomError> for RenderPassCreationError {
        #[inline]
        fn from(err: OomError) -> RenderPassCreationError {
            RenderPassCreationError::OomError(err)
        }
    }

    impl From<Error> for RenderPassCreationError {
        #[inline]
        fn from(err: Error) -> RenderPassCreationError {
            match err {
                err @ Error::OutOfHostMemory => {
                    RenderPassCreationError::OomError(OomError::from(err))
                },
                err @ Error::OutOfDeviceMemory => {
                    RenderPassCreationError::OomError(OomError::from(err))
                },
                _ => panic!("unexpected error: {:?}", err),
            }
        }
    }

    #[cfg(test)]
    mod tests {
        use format::Format;
        use framebuffer::RenderPass;
        use framebuffer::RenderPassCreationError;

        #[test]
        fn empty() {
            let (device, _) = gfx_dev_and_queue!();
            let _ = RenderPass::empty_single_pass(device).unwrap();
        }

        #[test]
        fn too_many_color_atch() {
            let (device, _) = gfx_dev_and_queue!();

            if device.physical_device().limits().max_color_attachments() >= 10 {
                return; // test ignored
            }

            let rp =
                single_pass_renderpass! {
                device.clone(),
                attachments: {
                    a1: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a2: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a3: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a4: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a5: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a6: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a7: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a8: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a9: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, },
                    a10: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, }
                },
                pass: {
                    color: [a1, a2, a3, a4, a5, a6, a7, a8, a9, a10],
                    depth_stencil: {}
                }
            };

            match rp {
                Err(RenderPassCreationError::ColorAttachmentsLimitExceeded) => (),
                _ => panic!(),
            }
        }

        #[test]
        fn non_zero_granularity() {
            let (device, _) = gfx_dev_and_queue!();

            let rp = single_pass_renderpass! {
                device.clone(),
                attachments: {
                    a: { load: Clear, store: DontCare, format: Format::R8G8B8A8Unorm, samples: 1, }
                },
                pass: {
                    color: [a],
                    depth_stencil: {}
                }
            }.unwrap();

            let granularity = rp.granularity();
            assert_ne!(granularity[0], 0);
            assert_ne!(granularity[1], 0);
        }
    }

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