vulkano/examples/src/bin/image-self-copy-blit/main.rs

// Copyright (c) 2021 The vulkano developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or https://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::{io::Cursor, sync::Arc};
use vulkano::{
    buffer::{Buffer, BufferContents, BufferCreateInfo, BufferUsage},
    command_buffer::{
        allocator::StandardCommandBufferAllocator, AutoCommandBufferBuilder, BlitImageInfo,
        BufferImageCopy, ClearColorImageInfo, CommandBufferUsage, CopyBufferToImageInfo,
        CopyImageInfo, ImageBlit, ImageCopy, PrimaryCommandBufferAbstract, RenderPassBeginInfo,
        SubpassContents,
    },
    descriptor_set::{
        allocator::StandardDescriptorSetAllocator, PersistentDescriptorSet, WriteDescriptorSet,
    },
    device::{
        physical::PhysicalDeviceType, Device, DeviceCreateInfo, DeviceExtensions, QueueCreateInfo,
        QueueFlags,
    },
    format::Format,
    image::{
        view::ImageView, ImageAccess, ImageDimensions, ImageLayout, ImageUsage, StorageImage,
        SwapchainImage,
    },
    instance::{Instance, InstanceCreateFlags, InstanceCreateInfo},
    memory::allocator::{AllocationCreateInfo, MemoryUsage, StandardMemoryAllocator},
    pipeline::{
        graphics::{
            color_blend::ColorBlendState,
            input_assembly::{InputAssemblyState, PrimitiveTopology},
            multisample::MultisampleState,
            rasterization::RasterizationState,
            vertex_input::{Vertex, VertexDefinition},
            viewport::{Viewport, ViewportState},
            GraphicsPipelineCreateInfo,
        },
        layout::PipelineDescriptorSetLayoutCreateInfo,
        GraphicsPipeline, Pipeline, PipelineBindPoint, PipelineLayout,
        PipelineShaderStageCreateInfo,
    },
    render_pass::{Framebuffer, FramebufferCreateInfo, RenderPass, Subpass},
    sampler::{Filter, Sampler, SamplerAddressMode, SamplerCreateInfo},
    swapchain::{
        acquire_next_image, AcquireError, Surface, Swapchain, SwapchainCreateInfo,
        SwapchainPresentInfo,
    },
    sync::{self, FlushError, GpuFuture},
    VulkanLibrary,
};
use winit::{
    event::{Event, WindowEvent},
    event_loop::{ControlFlow, EventLoop},
    window::WindowBuilder,
};

fn main() {
    // The start of this example is exactly the same as `triangle`. You should read the `triangle`
    // example if you haven't done so yet.

    let event_loop = EventLoop::new();

    let library = VulkanLibrary::new().unwrap();
    let required_extensions = Surface::required_extensions(&event_loop);
    let instance = Instance::new(
        library,
        InstanceCreateInfo {
            flags: InstanceCreateFlags::ENUMERATE_PORTABILITY,
            enabled_extensions: required_extensions,
            ..Default::default()
        },
    )
    .unwrap();

    let window = Arc::new(WindowBuilder::new().build(&event_loop).unwrap());
    let surface = Surface::from_window(instance.clone(), window.clone()).unwrap();

    let device_extensions = DeviceExtensions {
        khr_swapchain: true,
        ..DeviceExtensions::empty()
    };
    let (physical_device, queue_family_index) = instance
        .enumerate_physical_devices()
        .unwrap()
        .filter(|p| p.supported_extensions().contains(&device_extensions))
        .filter_map(|p| {
            p.queue_family_properties()
                .iter()
                .enumerate()
                .position(|(i, q)| {
                    q.queue_flags.intersects(QueueFlags::GRAPHICS)
                        && p.surface_support(i as u32, &surface).unwrap_or(false)
                })
                .map(|i| (p, i as u32))
        })
        .min_by_key(|(p, _)| match p.properties().device_type {
            PhysicalDeviceType::DiscreteGpu => 0,
            PhysicalDeviceType::IntegratedGpu => 1,
            PhysicalDeviceType::VirtualGpu => 2,
            PhysicalDeviceType::Cpu => 3,
            PhysicalDeviceType::Other => 4,
            _ => 5,
        })
        .unwrap();

    println!(
        "Using device: {} (type: {:?})",
        physical_device.properties().device_name,
        physical_device.properties().device_type,
    );

    let (device, mut queues) = Device::new(
        physical_device,
        DeviceCreateInfo {
            enabled_extensions: device_extensions,
            queue_create_infos: vec![QueueCreateInfo {
                queue_family_index,
                ..Default::default()
            }],
            ..Default::default()
        },
    )
    .unwrap();
    let queue = queues.next().unwrap();

    let (mut swapchain, images) = {
        let surface_capabilities = device
            .physical_device()
            .surface_capabilities(&surface, Default::default())
            .unwrap();
        let image_format = Some(
            device
                .physical_device()
                .surface_formats(&surface, Default::default())
                .unwrap()[0]
                .0,
        );

        Swapchain::new(
            device.clone(),
            surface,
            SwapchainCreateInfo {
                // Some drivers report `min_image_count=1` but fullscreen mode requires at least 2.
                min_image_count: surface_capabilities.min_image_count.max(2),
                image_format,
                image_extent: window.inner_size().into(),
                image_usage: ImageUsage::COLOR_ATTACHMENT,
                composite_alpha: surface_capabilities
                    .supported_composite_alpha
                    .into_iter()
                    .next()
                    .unwrap(),
                ..Default::default()
            },
        )
        .unwrap()
    };

    let memory_allocator = StandardMemoryAllocator::new_default(device.clone());

    #[derive(BufferContents, Vertex)]
    #[repr(C)]
    struct Vertex {
        #[format(R32G32_SFLOAT)]
        position: [f32; 2],
    }

    let vertices = [
        Vertex {
            position: [-0.5, -0.5],
        },
        Vertex {
            position: [-0.5, 0.5],
        },
        Vertex {
            position: [0.5, -0.5],
        },
        Vertex {
            position: [0.5, 0.5],
        },
    ];
    let vertex_buffer = Buffer::from_iter(
        &memory_allocator,
        BufferCreateInfo {
            usage: BufferUsage::VERTEX_BUFFER,
            ..Default::default()
        },
        AllocationCreateInfo {
            usage: MemoryUsage::Upload,
            ..Default::default()
        },
        vertices,
    )
    .unwrap();

    let render_pass = vulkano::single_pass_renderpass!(device.clone(),
        attachments: {
            color: {
                format: swapchain.image_format(),
                samples: 1,
                load_op: Clear,
                store_op: Store,
            },
        },
        pass: {
            color: [color],
            depth_stencil: {},
        },
    )
    .unwrap();

    let descriptor_set_allocator = StandardDescriptorSetAllocator::new(device.clone());
    let command_buffer_allocator =
        StandardCommandBufferAllocator::new(device.clone(), Default::default());
    let mut uploads = AutoCommandBufferBuilder::primary(
        &command_buffer_allocator,
        queue.queue_family_index(),
        CommandBufferUsage::OneTimeSubmit,
    )
    .unwrap();

    let texture = {
        let png_bytes = include_bytes!("image_img.png").to_vec();
        let cursor = Cursor::new(png_bytes);
        let decoder = png::Decoder::new(cursor);
        let mut reader = decoder.read_info().unwrap();
        let info = reader.info();
        let img_size = [info.width, info.height];
        let dimensions = ImageDimensions::Dim2d {
            width: info.width * 2,
            height: info.height * 2,
            array_layers: 1,
        };
        let mut image_data = Vec::new();
        image_data.resize((info.width * info.height * 4) as usize, 0);
        reader.next_frame(&mut image_data).unwrap();

        let image = StorageImage::new(
            &memory_allocator,
            dimensions,
            Format::R8G8B8A8_UNORM,
            [queue.queue_family_index()],
        )
        .unwrap();

        let buffer = Buffer::from_iter(
            &memory_allocator,
            BufferCreateInfo {
                usage: BufferUsage::TRANSFER_SRC,
                ..Default::default()
            },
            AllocationCreateInfo {
                usage: MemoryUsage::Upload,
                ..Default::default()
            },
            image_data,
        )
        .unwrap();

        // Here, we perform image copying and blitting on the same image.
        uploads
            // Clear the image buffer.
            .clear_color_image(ClearColorImageInfo::image(image.clone()))
            .unwrap()
            // Put our image in the top left corner.
            .copy_buffer_to_image(CopyBufferToImageInfo {
                regions: [BufferImageCopy {
                    image_subresource: image.subresource_layers(),
                    image_extent: [img_size[0], img_size[1], 1],
                    ..Default::default()
                }]
                .into(),
                ..CopyBufferToImageInfo::buffer_image(buffer, image.clone())
            })
            .unwrap()
            // Copy from the top left corner to the bottom right corner.
            .copy_image(CopyImageInfo {
                // Copying within the same image requires the General layout if the source and
                // destination subresources overlap.
                src_image_layout: ImageLayout::General,
                dst_image_layout: ImageLayout::General,
                regions: [ImageCopy {
                    src_subresource: image.subresource_layers(),
                    src_offset: [0, 0, 0],
                    dst_subresource: image.subresource_layers(),
                    dst_offset: [img_size[0], img_size[1], 0],
                    extent: [img_size[0], img_size[1], 1],
                    ..Default::default()
                }]
                .into(),
                ..CopyImageInfo::images(image.clone(), image.clone())
            })
            .unwrap()
            // Blit from the bottom right corner to the top right corner (flipped).
            .blit_image(BlitImageInfo {
                // Same as above applies for blitting.
                src_image_layout: ImageLayout::General,
                dst_image_layout: ImageLayout::General,
                regions: [ImageBlit {
                    src_subresource: image.subresource_layers(),
                    src_offsets: [
                        [img_size[0], img_size[1], 0],
                        [img_size[0] * 2, img_size[1] * 2, 1],
                    ],
                    dst_subresource: image.subresource_layers(),
                    // Swapping the two corners results in flipped image.
                    dst_offsets: [
                        [img_size[0] * 2 - 1, img_size[1] - 1, 0],
                        [img_size[0], 0, 1],
                    ],
                    ..Default::default()
                }]
                .into(),
                filter: Filter::Nearest,
                ..BlitImageInfo::images(image.clone(), image.clone())
            })
            .unwrap();

        ImageView::new_default(image).unwrap()
    };

    let sampler = Sampler::new(
        device.clone(),
        SamplerCreateInfo {
            mag_filter: Filter::Linear,
            min_filter: Filter::Linear,
            address_mode: [SamplerAddressMode::Repeat; 3],
            ..Default::default()
        },
    )
    .unwrap();

    let pipeline = {
        let vs = vs::load(device.clone())
            .unwrap()
            .entry_point("main")
            .unwrap();
        let fs = fs::load(device.clone())
            .unwrap()
            .entry_point("main")
            .unwrap();
        let vertex_input_state = Vertex::per_vertex()
            .definition(&vs.info().input_interface)
            .unwrap();
        let stages = [
            PipelineShaderStageCreateInfo::new(vs),
            PipelineShaderStageCreateInfo::new(fs),
        ];
        let layout = PipelineLayout::new(
            device.clone(),
            PipelineDescriptorSetLayoutCreateInfo::from_stages(&stages)
                .into_pipeline_layout_create_info(device.clone())
                .unwrap(),
        )
        .unwrap();
        let subpass = Subpass::from(render_pass.clone(), 0).unwrap();
        GraphicsPipeline::new(
            device.clone(),
            None,
            GraphicsPipelineCreateInfo {
                stages: stages.into_iter().collect(),
                vertex_input_state: Some(vertex_input_state),
                input_assembly_state: Some(
                    InputAssemblyState::new().topology(PrimitiveTopology::TriangleStrip),
                ),
                viewport_state: Some(ViewportState::viewport_dynamic_scissor_irrelevant()),
                rasterization_state: Some(RasterizationState::default()),
                multisample_state: Some(MultisampleState::default()),
                color_blend_state: Some(
                    ColorBlendState::new(subpass.num_color_attachments()).blend_alpha(),
                ),
                subpass: Some(subpass.into()),
                ..GraphicsPipelineCreateInfo::layout(layout)
            },
        )
        .unwrap()
    };

    let layout = pipeline.layout().set_layouts().get(0).unwrap();
    let set = PersistentDescriptorSet::new(
        &descriptor_set_allocator,
        layout.clone(),
        [WriteDescriptorSet::image_view_sampler(0, texture, sampler)],
        [],
    )
    .unwrap();

    let mut viewport = Viewport {
        offset: [0.0, 0.0],
        extent: [0.0, 0.0],
        depth_range: 0.0..=1.0,
    };
    let mut framebuffers = window_size_dependent_setup(&images, render_pass.clone(), &mut viewport);

    let mut recreate_swapchain = false;
    let mut previous_frame_end = Some(
        uploads
            .build()
            .unwrap()
            .execute(queue.clone())
            .unwrap()
            .boxed(),
    );

    event_loop.run(move |event, _, control_flow| match event {
        Event::WindowEvent {
            event: WindowEvent::CloseRequested,
            ..
        } => {
            *control_flow = ControlFlow::Exit;
        }
        Event::WindowEvent {
            event: WindowEvent::Resized(_),
            ..
        } => {
            recreate_swapchain = true;
        }
        Event::RedrawEventsCleared => {
            let image_extent: [u32; 2] = window.inner_size().into();

            if image_extent.contains(&0) {
                return;
            }

            previous_frame_end.as_mut().unwrap().cleanup_finished();

            if recreate_swapchain {
                let (new_swapchain, new_images) = swapchain
                    .recreate(SwapchainCreateInfo {
                        image_extent,
                        ..swapchain.create_info()
                    })
                    .expect("failed to recreate swapchain");

                swapchain = new_swapchain;
                framebuffers =
                    window_size_dependent_setup(&new_images, render_pass.clone(), &mut viewport);
                recreate_swapchain = false;
            }

            let (image_index, suboptimal, acquire_future) =
                match acquire_next_image(swapchain.clone(), None) {
                    Ok(r) => r,
                    Err(AcquireError::OutOfDate) => {
                        recreate_swapchain = true;
                        return;
                    }
                    Err(e) => panic!("failed to acquire next image: {e}"),
                };

            if suboptimal {
                recreate_swapchain = true;
            }

            let mut builder = AutoCommandBufferBuilder::primary(
                &command_buffer_allocator,
                queue.queue_family_index(),
                CommandBufferUsage::OneTimeSubmit,
            )
            .unwrap();
            builder
                .begin_render_pass(
                    RenderPassBeginInfo {
                        clear_values: vec![Some([0.0, 0.0, 1.0, 1.0].into())],
                        ..RenderPassBeginInfo::framebuffer(
                            framebuffers[image_index as usize].clone(),
                        )
                    },
                    SubpassContents::Inline,
                )
                .unwrap()
                .set_viewport(0, [viewport.clone()].into_iter().collect())
                .bind_pipeline_graphics(pipeline.clone())
                .bind_descriptor_sets(
                    PipelineBindPoint::Graphics,
                    pipeline.layout().clone(),
                    0,
                    set.clone(),
                )
                .bind_vertex_buffers(0, vertex_buffer.clone())
                .draw(vertex_buffer.len() as u32, 1, 0, 0)
                .unwrap()
                .end_render_pass()
                .unwrap();
            let command_buffer = builder.build().unwrap();

            let future = previous_frame_end
                .take()
                .unwrap()
                .join(acquire_future)
                .then_execute(queue.clone(), command_buffer)
                .unwrap()
                .then_swapchain_present(
                    queue.clone(),
                    SwapchainPresentInfo::swapchain_image_index(swapchain.clone(), image_index),
                )
                .then_signal_fence_and_flush();

            match future {
                Ok(future) => {
                    previous_frame_end = Some(future.boxed());
                }
                Err(FlushError::OutOfDate) => {
                    recreate_swapchain = true;
                    previous_frame_end = Some(sync::now(device.clone()).boxed());
                }
                Err(e) => {
                    println!("failed to flush future: {e}");
                    previous_frame_end = Some(sync::now(device.clone()).boxed());
                }
            }
        }
        _ => (),
    });
}

/// This function is called once during initialization, then again whenever the window is resized.
fn window_size_dependent_setup(
    images: &[Arc<SwapchainImage>],
    render_pass: Arc<RenderPass>,
    viewport: &mut Viewport,
) -> Vec<Arc<Framebuffer>> {
    let dimensions = images[0].dimensions().width_height();
    viewport.extent = [dimensions[0] as f32, dimensions[1] as f32];

    images
        .iter()
        .map(|image| {
            let view = ImageView::new_default(image.clone()).unwrap();
            Framebuffer::new(
                render_pass.clone(),
                FramebufferCreateInfo {
                    attachments: vec![view],
                    ..Default::default()
                },
            )
            .unwrap()
        })
        .collect::<Vec<_>>()
}

mod vs {
    vulkano_shaders::shader! {
        ty: "vertex",
        src: r"
            #version 450

            layout(location = 0) in vec2 position;
            layout(location = 0) out vec2 tex_coords;

            void main() {
                gl_Position = vec4(position, 0.0, 1.0);
                tex_coords = position + vec2(0.5);
            }
        ",
    }
}

mod fs {
    vulkano_shaders::shader! {
        ty: "fragment",
        src: r"
            #version 450

            layout(location = 0) in vec2 tex_coords;
            layout(location = 0) out vec4 f_color;

            layout(set = 0, binding = 0) uniform sampler2D tex;

            void main() {
                f_color = texture(tex, tex_coords);
            }
        ",
    }
}