mraphics_core/geometry/
cube.rs

1use crate::{GadgetData, Geometry, GeometryIndices};
2use nalgebra::Vector3;
3
4pub struct Cube {
5    pub width: f32,
6    pub height: f32,
7    pub depth: f32,
8}
9
10impl Cube {
11    pub fn new() -> Self {
12        Self::default()
13    }
14}
15
16impl Default for Cube {
17    fn default() -> Self {
18        Self {
19            width: 1.0,
20            height: 1.0,
21            depth: 1.0,
22        }
23    }
24}
25
26impl Geometry for Cube {
27    fn update_view(&self, view: &mut super::GeometryView) {
28        let mut vertices: Vec<f32> = Vec::new();
29
30        let mut build_plane =
31            |position: Vector3<f32>, width_len: f32, height_len: f32, normal: Vector3<f32>| {
32                let mut height = normal.yzx();
33                height.set_magnitude(height_len);
34
35                let mut width = height.cross(&normal);
36                width.set_magnitude(width_len);
37
38                vertices.extend(position.iter().chain(std::iter::once(&1.0)));
39                vertices.extend((position + width).iter().chain(std::iter::once(&1.0)));
40                vertices.extend(
41                    (position + width + height)
42                        .iter()
43                        .chain(std::iter::once(&1.0)),
44                );
45                vertices.extend((position + height).iter().chain(std::iter::once(&1.0)));
46                vertices.extend(position.iter().chain(std::iter::once(&1.0)));
47                vertices.extend(
48                    (position + width + height)
49                        .iter()
50                        .chain(std::iter::once(&1.0)),
51                );
52            };
53
54        let w = self.width;
55        let h = self.height;
56        let d = self.depth;
57
58        build_plane(
59            Vector3::new(-w / 2.0, -h / 2.0, -d / 2.0),
60            w,
61            h,
62            Vector3::z(),
63        );
64        build_plane(
65            Vector3::new(-w / 2.0, -h / 2.0, d / 2.0),
66            w,
67            h,
68            Vector3::z(),
69        );
70        build_plane(
71            Vector3::new(w / 2.0, -h / 2.0, -d / 2.0),
72            h,
73            d,
74            Vector3::x(),
75        );
76        build_plane(
77            Vector3::new(-w / 2.0, -h / 2.0, d / 2.0),
78            h,
79            d,
80            -Vector3::x(),
81        );
82        build_plane(
83            Vector3::new(-w / 2.0, h / 2.0, -d / 2.0),
84            d,
85            w,
86            Vector3::y(),
87        );
88        build_plane(
89            Vector3::new(w / 2.0, -h / 2.0, -d / 2.0),
90            d,
91            w,
92            -Vector3::y(),
93        );
94
95        view.reset_vertices();
96
97        view.attributes.push(GadgetData {
98            label: String::from(crate::constants::POSITION_ATTR_LABEL),
99            index: crate::constants::POSITION_ATTR_INDEX,
100            data: Vec::from(bytemuck::cast_slice::<f32, u8>(&vertices)),
101            needs_update_value: true,
102            needs_update_buffer: true,
103        });
104        view.indices = GeometryIndices::Sequential(vertices.len() as u32);
105    }
106}
mraphics_core/geometry/cube.rs

mraphics_core/geometry/
cube.rs
