alex/beta-minecraft-rust

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use common::entity::painting::Painting;
use glam::{Mat3, Vec3};

use super::Geometry;
use crate::world::ClientWorld;

impl Geometry {
    pub(super) fn painting(
        &mut self,
        painting: Painting,
        relative: Vec3,
        world: &ClientWorld,
        sky_darkness: u32,
    ) {
        let art = painting.art();
        let [width, height] = art.size.map(f32::from);
        let [u, v] = art.uv.map(f32::from);
        let rotation = Mat3::from_rotation_y((f32::from(painting.direction) * 90.0).to_radians());
        let texture = crate::assets::entity_texture("art/kz.png");
        let position = painting.position();
        let transform = |point| relative + rotation * (point / 16.0);
        for col in 0..art.size[0] / 16 {
            for row in 0..art.size[1] / 16 {
                let x0 = -width / 2.0 + f32::from(col * 16);
                let x1 = x0 + 16.0;
                let y0 = -height / 2.0 + f32::from(row * 16);
                let y1 = y0 + 16.0;
                let center = position
                    + (rotation * Vec3::new((x0 + x1) / 32.0, (y0 + y1) / 32.0, 0.0)).as_dvec3();
                let color = super::gray(super::brightness_at(world, center, sky_darkness));
                let vertices = super::box_corners(Vec3::new(x0, y0, -0.5), Vec3::new(x1, y1, 0.5));
                let front_uv = [
                    (u + width - f32::from((col + 1) * 16)) / 256.0,
                    (v + height - f32::from(row * 16)) / 256.0,
                    1.0 / 16.0,
                    -1.0 / 16.0,
                ];
                for (indices, uv) in [
                    ([1, 0, 3, 2], front_uv),
                    ([6, 7, 4, 5], [12.0 / 16.0, 0.0, 1.0 / 16.0, 1.0 / 16.0]),
                    ([2, 3, 7, 6], [12.0 / 16.0, 1.0 / 512.0, 1.0 / 16.0, 0.0]),
                    ([5, 4, 0, 1], [12.0 / 16.0, 1.0 / 512.0, 1.0 / 16.0, 0.0]),
                    ([6, 5, 1, 2], [385.0 / 512.0, 0.0, 0.0, 1.0 / 16.0]),
                    ([3, 0, 4, 7], [385.0 / 512.0, 0.0, 0.0, 1.0 / 16.0]),
                ] {
                    self.quad(indices.map(|i| transform(vertices[i])), uv, texture, color);
                }
            }
        }
    }
}