nightshade 0.47.0

A cross-platform data-oriented game engine.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

use crate::ecs::world::World;
use crate::render::wgpu::rendergraph::{PassExecutionContext, PassNode};

/// Render-graph node that draws the tessellated egui frame on top of the
/// swapchain. Built into the graph after the retained [`UiPass`](super::UiPass)
/// so immediate-mode panels composite over everything else. The renderer holds
/// no depth attachment because egui is a flat overlay.
pub struct EguiPass {
    renderer: egui_wgpu::Renderer,
    screen_descriptor: egui_wgpu::ScreenDescriptor,
    paint_jobs: Vec<egui::ClippedPrimitive>,
}

impl EguiPass {
    pub fn new(device: &wgpu::Device, surface_format: wgpu::TextureFormat) -> Self {
        let renderer = egui_wgpu::Renderer::new(
            device,
            surface_format,
            egui_wgpu::RendererOptions {
                depth_stencil_format: None,
                msaa_samples: 1,
                ..Default::default()
            },
        );

        Self {
            renderer,
            screen_descriptor: egui_wgpu::ScreenDescriptor {
                size_in_pixels: [1, 1],
                pixels_per_point: 1.0,
            },
            paint_jobs: Vec::new(),
        }
    }

    pub fn update_textures(
        &mut self,
        device: &wgpu::Device,
        queue: &wgpu::Queue,
        textures_delta: &egui::TexturesDelta,
    ) {
        for (id, image_delta) in &textures_delta.set {
            self.renderer
                .update_texture(device, queue, *id, image_delta);
        }
        for id in &textures_delta.free {
            self.renderer.free_texture(id);
        }
    }

    pub fn set_paint_jobs(&mut self, paint_jobs: Vec<egui::ClippedPrimitive>) {
        self.paint_jobs = paint_jobs;
    }

    pub fn set_screen_descriptor(&mut self, screen_descriptor: egui_wgpu::ScreenDescriptor) {
        self.screen_descriptor = screen_descriptor;
    }
}

impl PassNode<World> for EguiPass {
    fn name(&self) -> &str {
        "egui_pass"
    }

    fn reads(&self) -> Vec<&str> {
        vec![]
    }

    fn writes(&self) -> Vec<&str> {
        vec![]
    }

    fn reads_writes(&self) -> Vec<&str> {
        vec!["color"]
    }

    fn execute<'r, 'e>(
        &mut self,
        context: PassExecutionContext<'r, 'e, World>,
    ) -> Result<
        Vec<crate::render::wgpu::rendergraph::SubGraphRunCommand<'r>>,
        crate::render::wgpu::rendergraph::RenderGraphError,
    > {
        if !context.is_pass_enabled() {
            return Ok(context.into_sub_graph_commands());
        }

        let (color_view, color_load, color_store) = context.get_color_attachment("color")?;
        let (target_width, target_height) = context.get_texture_size("color")?;
        self.screen_descriptor.size_in_pixels = [target_width, target_height];

        if !self.paint_jobs.is_empty() {
            self.renderer.update_buffers(
                context.device,
                context.queue,
                context.encoder,
                &self.paint_jobs,
                &self.screen_descriptor,
            );

            self.renderer.render(
                &mut context
                    .encoder
                    .begin_render_pass(&wgpu::RenderPassDescriptor {
                        label: Some("Egui Pass"),
                        color_attachments: &[Some(wgpu::RenderPassColorAttachment {
                            view: color_view,
                            resolve_target: None,
                            ops: wgpu::Operations {
                                load: color_load,
                                store: color_store,
                            },
                            depth_slice: None,
                        })],
                        depth_stencil_attachment: None,
                        timestamp_writes: None,
                        occlusion_query_set: None,
                        multiview_mask: None,
                    })
                    .forget_lifetime(),
                &self.paint_jobs,
                &self.screen_descriptor,
            );
        }

        Ok(context.into_sub_graph_commands())
    }
}