bevy_smud 0.14.0

2d sdf shape renderer plugin for Bevy
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

use bevy::prelude::*;

use crate::util::generate_shader_id;

/// Extension trait for Assets<Shader> for conveniently creating new shaders from code
pub trait SdfAssets {
    /// Create a sdf shader from the given wgsl body
    fn add_sdf_body<T: Into<String>>(&mut self, sdf: T) -> Handle<Shader>;
    /// Create a sdf shader from the given wgsl expression
    fn add_sdf_expr<T: Into<String>>(&mut self, sdf: T) -> Handle<Shader>;
    /// Create a fill shader from the given wgsl body
    fn add_fill_body<T: Into<String>>(&mut self, fill: T) -> Handle<Shader>;
    /// Create a fill shader from the given wgsl expression
    fn add_fill_expr<T: Into<String>>(&mut self, fill: T) -> Handle<Shader>;
}

impl SdfAssets for Assets<Shader> {
    fn add_sdf_body<T: Into<String>>(&mut self, sdf: T) -> Handle<Shader> {
        let body = sdf.into();
        let id = generate_shader_id();
        let shader = Shader::from_wgsl(
            format!(
                r#"
#define_import_path smud::sdf{id}

#import smud

fn sdf(input: smud::SdfInput) -> f32 {{
    // Backward compatibility aliases for the old API
    let p = input.pos;
    let params = input.params;
    let bounds = input.bounds;

    {body}
}}
"#
            ),
            file!(),
        );
        self.add(shader)
    }

    fn add_fill_body<T: Into<String>>(&mut self, fill: T) -> Handle<Shader> {
        let body = fill.into();
        let id = generate_shader_id();
        let shader = Shader::from_wgsl(
            format!(
                r#"
#define_import_path smud::fill{id}

#import smud
#import bevy_render::globals::Globals

@group(0) @binding(1) var<uniform> globals: Globals;

fn fill(input: smud::FillInput) -> vec4<f32> {{
    let time = globals.time;
    let p = input.pos;
    let params = input.params;
    let d = input.distance;
    {body}
}}
"#
            ),
            file!(),
        );
        self.add(shader)
    }

    fn add_sdf_expr<T: Into<String>>(&mut self, sdf: T) -> Handle<Shader> {
        let e = sdf.into();
        self.add_sdf_body(format!("return {e};"))
    }

    fn add_fill_expr<T: Into<String>>(&mut self, fill: T) -> Handle<Shader> {
        let e = fill.into();
        self.add_fill_body(format!("return {e};"))
    }
}