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feat(math): Étape 15.A primitives — cube, plane, uv_sphere, icosphere, cylinder, cone, torus + tests ; factorisation cube_geometry (cube, spot_test)

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Jérôme Bousquié
2026-09-20 07:42:27 +02:00
parent 84ceffc755
commit 4da89c7178
4 changed files with 535 additions and 118 deletions
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lib/examples/spot_test.rs
+2 -54
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@@ -12,7 +12,7 @@
use glam::{Quat, Vec3};
use wsg_lib::AppHandler;
use wsg_lib::app::AppBuilder;
use wsg_lib::resources::Geometry;
use wsg_lib::math::cube;
use wsg_lib::utils::WsgError;
/// Handler de test : cube qui tourne lentement sur deux axes, éclairé **uniquement** par une spot.
@@ -21,58 +21,6 @@ struct SpotTest {
angle_y: f32,
}
/// Cube unitaire centré à l'origine (mêmes 24 sommets / 36 indices que l'exemple `cube`).
fn cube_geometry() -> Geometry {
let s = 0.5;
let faces: [([f32; 3], [[f32; 3]; 4]); 6] = [
(
[0.0, 0.0, 1.0],
[[-s, -s, s], [s, -s, s], [s, s, s], [-s, s, s]],
), // +Z
(
[0.0, 0.0, -1.0],
[[s, -s, -s], [-s, -s, -s], [-s, s, -s], [s, s, -s]],
), // -Z
(
[1.0, 0.0, 0.0],
[[s, -s, -s], [s, s, -s], [s, s, s], [s, -s, s]],
), // +X
(
[-1.0, 0.0, 0.0],
[[-s, -s, s], [-s, s, s], [-s, s, -s], [-s, -s, -s]],
), // -X
(
[0.0, 1.0, 0.0],
[[-s, s, -s], [s, s, -s], [s, s, s], [-s, s, s]],
), // +Y
(
[0.0, -1.0, 0.0],
[[-s, -s, s], [s, -s, s], [s, -s, -s], [-s, -s, -s]],
), // -Y
];
let mut positions = Vec::with_capacity(24);
let mut normals = Vec::with_capacity(24);
let mut uvs = Vec::with_capacity(24);
let quad_uvs = [[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 1.0]];
for (normal, corners) in faces {
for (i, corner) in corners.iter().enumerate() {
positions.push(*corner);
normals.push(normal);
uvs.push(quad_uvs[i]);
}
}
let mut indices = Vec::with_capacity(36);
for face in 0..6u16 {
let b = face * 4;
indices.extend_from_slice(&[b, b + 1, b + 2, b, b + 2, b + 3]);
}
Geometry::new(positions)
.with_normals(normals)
.with_uvs(uvs)
.with_indices(indices)
}
impl AppHandler for SpotTest {
fn setup(&mut self, app: &mut wsg_lib::App) {
app.scene
@@ -80,7 +28,7 @@ impl AppHandler for SpotTest {
.unwrap();
app.scene.add_material_shader("mat", "standard").unwrap();
app.scene
.create_mesh("cube_mesh", cube_geometry(), Some("mat"))
.create_mesh("cube_mesh", cube(1.0), Some("mat"))
.unwrap();
app.scene.add_entity("cube", "cube_mesh").unwrap();