add bevy plugin

Cargo.toml

@@ -4,7 +4,8 @@ members = [
     "crates/servicepoint",
     "crates/servicepoint_binding_c",
     "crates/servicepoint_binding_cs",
-    "crates/servicepoint_binding_c/examples/lang_c"
+    "crates/servicepoint_binding_c/examples/lang_c",
+    "crates/servicepoint_bevy"
 ]
 
 [workspace.package]

crates/servicepoint/src/command.rs

@@ -6,7 +6,7 @@ use crate::{
 };
 
 /// An origin marks the top left position of a window sent to the display.
-#[derive(Debug, Clone, Copy, PartialEq)]
+#[derive(Debug, Default, Clone, Copy, PartialEq)]
 pub struct Origin(pub usize, pub usize);
 
 impl std::ops::Add<Origin> for Origin {

crates/servicepoint_bevy/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "servicepoint_bevy"
+edition = "2021"
+license = "Apache-2.0 OR MIT"
+version.workspace = true
+
+[dependencies]
+servicepoint = { version = "0.5.0", path = "../servicepoint" }
+
+bevy = { version = "0.13.2", default-features = false, features = ["bevy_core_pipeline", "bevy_asset", "bevy_render", "bevy_sprite"] }
+image = { version = "0.24", default-features = false }
+futures = { version = "0.3" }
+futures-lite = { version = "2.1" }
+wgpu = { version = "0.19.1" }
+bytemuck = { version = "1.13" }

crates/servicepoint_bevy/README.md

@@ -0,0 +1,8 @@
+# servicepoint_bevy
+
+Provides bevy helpers for outputting to the servicepoint display.
+
+## LICENSE
+
+The bevy plugin is based on [bevy_image_export](https://github.com/paulkre/bevy_image_export/).
+The crate inherits the MIT/Apache-2.0 dual license.

crates/servicepoint_bevy/src/lib.rs

@@ -0,0 +1,365 @@
+// Source: https://github.com/paulkre/bevy_image_export/
+// License: MIT / Apache-2.0
+
+use bevy::{
+    ecs::{
+        query::QueryItem,
+        system::{lifetimeless::SRes, SystemParamItem},
+    },
+    prelude::*,
+    render::{
+        camera::{CameraUpdateSystem, RenderTarget, ScalingMode},
+        extract_component::{ExtractComponent, ExtractComponentPlugin},
+        graph::CameraDriverLabel,
+        render_asset::{
+            PrepareAssetError, RenderAsset, RenderAssetPlugin,
+            RenderAssetUsages, RenderAssets,
+        },
+        render_graph::{
+            Node, NodeRunError, RenderGraph, RenderGraphContext, RenderLabel,
+        },
+        render_resource::{
+            Buffer, BufferDescriptor, BufferUsages, Extent3d, ImageCopyBuffer,
+            ImageDataLayout, MapMode, TextureDescriptor, TextureDimension,
+            TextureFormat, TextureUsages,
+        },
+        renderer::{RenderContext, RenderDevice},
+        Render, RenderApp, RenderSet,
+    },
+};
+use futures::channel::oneshot;
+use image::{ImageBuffer, Rgba};
+use wgpu::Maintain;
+
+use servicepoint::{
+    BitVec, Command::BitmapLinearWin, CompressionCode::Lzma, Connection,
+    DataRef, Origin, PixelGrid,
+};
+
+#[derive(Asset, Reflect, Clone, Default)]
+pub struct ServicePointExportSource {
+    pub image: Handle<Image>,
+}
+
+/// Settings for handling an
+#[derive(Component, Clone)]
+pub struct ServicePointExportSettings {
+    pub origin: Origin,
+    pub window_width: usize,
+    pub window_height: usize,
+}
+
+pub struct GpuImageExportSource {
+    pub buffer: Buffer,
+    pub source_handle: Handle<Image>,
+    pub source_size: Extent3d,
+    pub bytes_per_row: u32,
+    pub padded_bytes_per_row: u32,
+}
+
+#[derive(Bundle)]
+pub struct ImageExportBundle {
+    pub source: Handle<ServicePointExportSource>,
+    pub settings: ServicePointExportSettings,
+}
+
+/// Plugin enabling the generation of image sequences.
+pub struct ServicePointPlugin {
+    pub bind: String,
+}
+
+#[derive(Resource)]
+struct ServicePointPluginConnection {
+    pub connection: Connection,
+}
+
+#[derive(Debug, Hash, PartialEq, Eq, Clone, SystemSet)]
+pub enum ImageExportSystems {
+    SetupImageExport,
+    SetupImageExportFlush,
+}
+
+impl RenderAsset for ServicePointExportSource {
+    type PreparedAsset = GpuImageExportSource;
+    type Param = (SRes<RenderDevice>, SRes<RenderAssets<Image>>);
+
+    fn asset_usage(&self) -> RenderAssetUsages {
+        RenderAssetUsages::RENDER_WORLD
+    }
+
+    fn prepare_asset(
+        self,
+        (device, images): &mut SystemParamItem<Self::Param>,
+    ) -> Result<Self::PreparedAsset, PrepareAssetError<Self>> {
+        let gpu_image = images.get(&self.image).unwrap();
+
+        let size = gpu_image.texture.size();
+        let format = &gpu_image.texture_format;
+        let bytes_per_row = (size.width / format.block_dimensions().0)
+            * format.block_copy_size(None).unwrap();
+        let padded_bytes_per_row =
+            RenderDevice::align_copy_bytes_per_row(bytes_per_row as usize)
+                as u32;
+
+        let source_size = gpu_image.texture.size();
+
+        Ok(GpuImageExportSource {
+            buffer: device.create_buffer(&BufferDescriptor {
+                label: Some("Image Export Buffer"),
+                size: (source_size.height * padded_bytes_per_row) as u64,
+                usage: BufferUsages::COPY_DST | BufferUsages::MAP_READ,
+                mapped_at_creation: false,
+            }),
+            source_handle: self.image,
+            source_size,
+            bytes_per_row,
+            padded_bytes_per_row,
+        })
+    }
+}
+
+impl ExtractComponent for ServicePointExportSettings {
+    type QueryData = (&'static Self, &'static Handle<ServicePointExportSource>);
+    type QueryFilter = ();
+    type Out = (Self, Handle<ServicePointExportSource>);
+
+    fn extract_component(
+        (settings, source_handle): QueryItem<'_, Self::QueryData>,
+    ) -> Option<Self::Out> {
+        Some((settings.clone(), source_handle.clone_weak()))
+    }
+}
+
+fn get_image_bytes_from_gpu(
+    gpu_source: &GpuImageExportSource,
+    render_device: &Res<RenderDevice>,
+) -> Vec<u8> {
+    let source_size = gpu_source.source_size;
+
+    let slice = gpu_source.buffer.slice(..);
+
+    let (mapping_tx, mapping_rx) = oneshot::channel();
+
+    render_device.map_buffer(&slice, MapMode::Read, move |res| {
+        mapping_tx.send(res).unwrap();
+    });
+
+    render_device.poll(Maintain::Wait);
+    futures_lite::future::block_on(mapping_rx).unwrap().unwrap();
+
+    let vec = slice.get_mapped_range().to_vec();
+    gpu_source.buffer.unmap();
+
+    let bytes_per_row = gpu_source.bytes_per_row as usize;
+    let padded_bytes_per_row = gpu_source.padded_bytes_per_row as usize;
+    if bytes_per_row == padded_bytes_per_row {
+        vec
+    } else {
+        let mut unpadded_bytes = Vec::<u8>::with_capacity(
+            source_size.height as usize * bytes_per_row,
+        );
+
+        for padded_row in vec.chunks(padded_bytes_per_row) {
+            unpadded_bytes.extend_from_slice(&padded_row[..bytes_per_row]);
+        }
+
+        unpadded_bytes
+    }
+}
+
+fn send_buffer_to_connection(
+    export_bundles: Query<(
+        &Handle<ServicePointExportSource>,
+        &ServicePointExportSettings,
+    )>,
+    sources: Res<RenderAssets<ServicePointExportSource>>,
+    render_device: Res<RenderDevice>,
+    connection: Res<ServicePointPluginConnection>,
+) {
+    for (source_handle, settings) in &export_bundles {
+        let gpu_source = match sources.get(source_handle) {
+            None => continue,
+            Some(source) => source,
+        };
+
+        let image_bytes = get_image_bytes_from_gpu(gpu_source, &render_device);
+
+        let buffer = match ImageBuffer::<Rgba<u8>, _>::from_raw(
+            settings.window_width as u32,
+            settings.window_height as u32,
+            image_bytes,
+        ) {
+            None => {
+                println!("Failed creating image buffer");
+                continue;
+            }
+            Some(buffer) => buffer,
+        };
+
+        let mut bit_vec =
+            BitVec::new(settings.window_height * settings.window_width);
+
+        for (index, pixel) in buffer.chunks_exact(4).enumerate() {
+            assert_eq!(pixel.len(), 4);
+            if pixel[0] != 0 || pixel[1] != 0 || pixel[2] != 0 {
+                bit_vec.set(index, pixel[3] != 0);
+            }
+        }
+
+        let pixels = PixelGrid::load(
+            settings.window_width,
+            settings.window_height,
+            bit_vec.data_ref(),
+        );
+
+        connection
+            .connection
+            .send(BitmapLinearWin(settings.origin, pixels, Lzma))
+            .expect("send failed");
+    }
+}
+
+impl Plugin for ServicePointPlugin {
+    fn build(&self, app: &mut App) {
+        app.configure_sets(
+            PostUpdate,
+            (
+                ImageExportSystems::SetupImageExport,
+                ImageExportSystems::SetupImageExportFlush,
+            )
+                .chain()
+                .before(CameraUpdateSystem),
+        )
+        .register_type::<ServicePointExportSource>()
+        .init_asset::<ServicePointExportSource>()
+        .register_asset_reflect::<ServicePointExportSource>()
+        .add_plugins((
+            RenderAssetPlugin::<ServicePointExportSource>::default(),
+            ExtractComponentPlugin::<ServicePointExportSettings>::default(),
+        ))
+        .add_systems(
+            PostUpdate,
+            (
+                apply_deferred
+                    .in_set(ImageExportSystems::SetupImageExportFlush),
+            ),
+        );
+
+        let render_app = app.sub_app_mut(RenderApp);
+
+        let connection =
+            Connection::open(&self.bind).expect("could not connect to display");
+
+        render_app
+            .insert_resource(ServicePointPluginConnection { connection })
+            .add_systems(
+                Render,
+                send_buffer_to_connection
+                    .after(RenderSet::Render)
+                    .before(RenderSet::Cleanup),
+            );
+
+        let mut graph =
+            render_app.world.get_resource_mut::<RenderGraph>().unwrap();
+
+        graph.add_node(ImageExportLabel, ImageExportNode);
+        graph.add_node_edge(CameraDriverLabel, ImageExportLabel);
+    }
+}
+
+pub fn make_export_bundle(
+    settings: ServicePointExportSettings,
+    scaling_mode: ScalingMode,
+    main_camera: &mut bevy::ecs::system::EntityCommands,
+    images: &mut ResMut<Assets<Image>>,
+    export_sources: &mut ResMut<Assets<ServicePointExportSource>>,
+) -> ImageExportBundle {
+    // Create an output texture.
+    let size = Extent3d {
+        width: settings.window_width as u32,
+        height: settings.window_height as u32,
+        ..default()
+    };
+    let mut export_texture = Image {
+        texture_descriptor: TextureDescriptor {
+            label: None,
+            size,
+            dimension: TextureDimension::D2,
+            format: TextureFormat::Rgba8UnormSrgb,
+            mip_level_count: 1,
+            sample_count: 1,
+            usage: TextureUsages::COPY_DST
+                | TextureUsages::COPY_SRC
+                | TextureUsages::RENDER_ATTACHMENT,
+            view_formats: &[],
+        },
+        ..default()
+    };
+    export_texture.resize(size);
+
+    let export_texture = images.add(export_texture);
+
+    let mut export_camera = Camera2dBundle {
+        camera: Camera {
+            target: RenderTarget::Image(export_texture.clone()),
+            clear_color: ClearColorConfig::Custom(Color::BLACK),
+            ..default()
+        },
+        ..default()
+    };
+
+    export_camera.projection.scaling_mode = scaling_mode;
+
+    // render main camera to output texture as well
+    main_camera.with_children(|parent| {
+        parent.spawn(export_camera);
+    });
+
+    let export_source = ServicePointExportSource {
+        image: export_texture,
+    };
+
+    ImageExportBundle {
+        source: export_sources.add(export_source),
+        settings,
+    }
+}
+
+#[derive(Debug, Hash, PartialEq, Eq, Clone, RenderLabel)]
+pub struct ImageExportLabel;
+
+pub struct ImageExportNode;
+
+impl Node for ImageExportNode {
+    fn run(
+        &self,
+        _graph: &mut RenderGraphContext,
+        render_context: &mut RenderContext,
+        world: &World,
+    ) -> Result<(), NodeRunError> {
+        for (_, source) in world
+            .resource::<RenderAssets<ServicePointExportSource>>()
+            .iter()
+        {
+            if let Some(gpu_image) = world
+                .resource::<RenderAssets<Image>>()
+                .get(&source.source_handle)
+            {
+                render_context.command_encoder().copy_texture_to_buffer(
+                    gpu_image.texture.as_image_copy(),
+                    ImageCopyBuffer {
+                        buffer: &source.buffer,
+                        layout: ImageDataLayout {
+                            offset: 0,
+                            bytes_per_row: Some(source.padded_bytes_per_row),
+                            rows_per_image: None,
+                        },
+                    },
+                    source.source_size,
+                );
+            }
+        }
+
+        Ok(())
+    }
+}

shell.nix

@@ -1,11 +1,26 @@
 { pkgs ? import <nixpkgs> { } }:
-pkgs.mkShell {
-  nativeBuildInputs = with pkgs.buildPackages; [
+
+with pkgs;
+
+mkShell rec {
+  nativeBuildInputs = [
     rustup
     pkg-config
-    xe
-    lzma
-    cargo-tarpaulin
     gnumake
+
+    # find missing test cases
+    cargo-tarpaulin
   ];
+  buildInputs = [
+    # servicepoint2 compression
+    lzma xe
+
+    # for bevy
+    udev alsa-lib vulkan-loader
+    # bevy x11
+    xorg.libX11 xorg.libXcursor xorg.libXi xorg.libXrandr
+    # bevy wayland
+    libxkbcommon wayland
+  ];
+  LD_LIBRARY_PATH = lib.makeLibraryPath buildInputs;
 }