vulkano/examples/src/bin/runtime-shader/main.rs

// Copyright (c) 2017 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.
//
// This example demonstrates one way of preparing data structures and loading
// SPIRV shaders from external source (file system).
//
// Note that you will need to do all correctness checking by yourself.
//
// vert.glsl and frag.glsl must be built by yourself.
// One way of building them is to build Khronos' glslang and use
// glslangValidator tool:
// $ glslangValidator vert.glsl -V -S vert -o vert.spv
// $ glslangValidator frag.glsl -V -S frag -o frag.spv
// Vulkano uses glslangValidator to build your shaders internally.

use bytemuck::{Pod, Zeroable};
use std::{fs::File, io::Read, sync::Arc};
use vulkano::{
    buffer::{BufferUsage, CpuAccessibleBuffer, TypedBufferAccess},
    command_buffer::{
        AutoCommandBufferBuilder, CommandBufferUsage, RenderPassBeginInfo, SubpassContents,
    },
    device::{
        physical::{PhysicalDevice, PhysicalDeviceType},
        Device, DeviceCreateInfo, DeviceExtensions, QueueCreateInfo,
    },
    image::{view::ImageView, ImageAccess, ImageUsage, SwapchainImage},
    impl_vertex,
    instance::{Instance, InstanceCreateInfo},
    pipeline::{
        graphics::{
            input_assembly::InputAssemblyState,
            rasterization::{CullMode, FrontFace, RasterizationState},
            vertex_input::BuffersDefinition,
            viewport::{Viewport, ViewportState},
        },
        GraphicsPipeline,
    },
    render_pass::{Framebuffer, FramebufferCreateInfo, RenderPass, Subpass},
    shader::ShaderModule,
    swapchain::{
        acquire_next_image, AcquireError, Swapchain, SwapchainCreateInfo, SwapchainCreationError,
    },
    sync::{self, FlushError, GpuFuture},
    VulkanLibrary,
};
use vulkano_win::VkSurfaceBuild;
use winit::{
    event::{Event, WindowEvent},
    event_loop::{ControlFlow, EventLoop},
    window::{Window, WindowBuilder},
};

#[repr(C)]
#[derive(Clone, Copy, Debug, Default, Zeroable, Pod)]
pub struct Vertex {
    pub position: [f32; 2],
    pub color: [f32; 3],
}

impl_vertex!(Vertex, position, color);

fn main() {
    let library = VulkanLibrary::new().unwrap();
    let required_extensions = vulkano_win::required_extensions(&library);
    let instance = Instance::new(
        library,
        InstanceCreateInfo {
            enabled_extensions: required_extensions,
            // Enable enumerating devices that use non-conformant vulkan implementations. (ex. MoltenVK)
            enumerate_portability: true,
            ..Default::default()
        },
    )
    .unwrap();

    let event_loop = EventLoop::new();
    let surface = WindowBuilder::new()
        .build_vk_surface(&event_loop, instance.clone())
        .unwrap();

    let device_extensions = DeviceExtensions {
        khr_swapchain: true,
        ..DeviceExtensions::none()
    };
    let (physical_device, queue_family) = PhysicalDevice::enumerate(&instance)
        .filter(|&p| p.supported_extensions().is_superset_of(&device_extensions))
        .filter_map(|p| {
            p.queue_families()
                .find(|&q| q.supports_graphics() && q.supports_surface(&surface).unwrap_or(false))
                .map(|q| (p, q))
        })
        .min_by_key(|(p, _)| match p.properties().device_type {
            PhysicalDeviceType::DiscreteGpu => 0,
            PhysicalDeviceType::IntegratedGpu => 1,
            PhysicalDeviceType::VirtualGpu => 2,
            PhysicalDeviceType::Cpu => 3,
            PhysicalDeviceType::Other => 4,
        })
        .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::family(queue_family)],
            ..Default::default()
        },
    )
    .unwrap();
    let queue = queues.next().unwrap();

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

        Swapchain::new(
            device.clone(),
            surface.clone(),
            SwapchainCreateInfo {
                min_image_count: surface_capabilities.min_image_count,
                image_format,
                image_extent: surface.window().inner_size().into(),
                image_usage: ImageUsage::color_attachment(),
                composite_alpha: surface_capabilities
                    .supported_composite_alpha
                    .iter()
                    .next()
                    .unwrap(),
                ..Default::default()
            },
        )
        .unwrap()
    };

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

    let vs = {
        let mut f = File::open("src/bin/runtime-shader/vert.spv")
            .expect("Can't find file src/bin/runtime-shader/vert.spv This example needs to be run from the root of the example crate.");
        let mut v = vec![];
        f.read_to_end(&mut v).unwrap();
        // Create a ShaderModule on a device the same Shader::load does it.
        // NOTE: You will have to verify correctness of the data by yourself!
        unsafe { ShaderModule::from_bytes(device.clone(), &v) }.unwrap()
    };

    let fs = {
        let mut f = File::open("src/bin/runtime-shader/frag.spv")
            .expect("Can't find file src/bin/runtime-shader/frag.spv");
        let mut v = vec![];
        f.read_to_end(&mut v).unwrap();
        unsafe { ShaderModule::from_bytes(device.clone(), &v) }.unwrap()
    };

    let graphics_pipeline = GraphicsPipeline::start()
        .vertex_input_state(BuffersDefinition::new().vertex::<Vertex>())
        .vertex_shader(vs.entry_point("main").unwrap(), ())
        .input_assembly_state(InputAssemblyState::new())
        .viewport_state(ViewportState::viewport_dynamic_scissor_irrelevant())
        .fragment_shader(fs.entry_point("main").unwrap(), ())
        .rasterization_state(
            RasterizationState::new()
                .cull_mode(CullMode::Front)
                .front_face(FrontFace::CounterClockwise),
        )
        .render_pass(Subpass::from(render_pass.clone(), 0).unwrap())
        .build(device.clone())
        .unwrap();

    let mut recreate_swapchain = false;

    let vertices = [
        Vertex {
            position: [-1.0, 1.0],
            color: [1.0, 0.0, 0.0],
        },
        Vertex {
            position: [0.0, -1.0],
            color: [0.0, 1.0, 0.0],
        },
        Vertex {
            position: [1.0, 1.0],
            color: [0.0, 0.0, 1.0],
        },
    ];
    let vertex_buffer =
        CpuAccessibleBuffer::from_iter(device.clone(), BufferUsage::all(), false, vertices)
            .unwrap();

    // NOTE: We don't create any descriptor sets in this example, but you should
    // note that passing wrong types, providing sets at wrong indexes will cause
    // descriptor set builder to return Err!

    let mut viewport = Viewport {
        origin: [0.0, 0.0],
        dimensions: [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 previous_frame_end = Some(sync::now(device.clone()).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 dimensions = surface.window().inner_size();
            if dimensions.width == 0 || dimensions.height == 0 {
                return;
            }

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

            if recreate_swapchain {
                let (new_swapchain, new_images) = match swapchain.recreate(SwapchainCreateInfo {
                    image_extent: dimensions.into(),
                    ..swapchain.create_info()
                }) {
                    Ok(r) => r,
                    Err(SwapchainCreationError::ImageExtentNotSupported { .. }) => return,
                    Err(e) => panic!("Failed to recreate swapchain: {:?}", e),
                };

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

            let (image_num, 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(
                device.clone(),
                queue.family(),
                CommandBufferUsage::MultipleSubmit,
            )
            .unwrap();
            builder
                .begin_render_pass(
                    RenderPassBeginInfo {
                        clear_values: vec![Some([0.0, 0.0, 0.0, 1.0].into())],
                        ..RenderPassBeginInfo::framebuffer(framebuffers[image_num].clone())
                    },
                    SubpassContents::Inline,
                )
                .unwrap()
                .set_viewport(0, [viewport.clone()])
                .bind_pipeline_graphics(graphics_pipeline.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(), swapchain.clone(), image_num)
                .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 method is called once during initialization, then again whenever the window is resized
fn window_size_dependent_setup(
    images: &[Arc<SwapchainImage<Window>>],
    render_pass: Arc<RenderPass>,
    viewport: &mut Viewport,
) -> Vec<Arc<Framebuffer>> {
    let dimensions = images[0].dimensions().width_height();
    viewport.dimensions = [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<_>>()
}