alex/beta-minecraft-rust

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use super::Geometry;
use common::math::cos;
use glam::{Mat4, Vec3};

impl Geometry {
    /// `bob` already sways with the swing.
    pub(super) fn held_map(
        &mut self,
        bob: Mat4,
        map: Option<&common::map::Map>,
        equipped: f32,
        [root, squared]: [f32; 2],
        pitch: f32,
        brightness: f32,
    ) {
        let tilt =
            -cos((1.0 - pitch / 45.0 + 0.1).clamp(0.0, 1.0) * std::f32::consts::PI) * 0.5 + 0.5;
        let mut transform =
            bob * Mat4::from_translation(Vec3::new(
                0.0,
                -(1.0 - equipped) * 1.2 - tilt * 0.5 + 0.04,
                -0.72,
            )) * Mat4::from_rotation_y(90_f32.to_radians())
                * Mat4::from_rotation_z((-tilt * 85.0).to_radians());
        for sign in [-1.0, 1.0] {
            let hand = transform
                * Mat4::from_translation(Vec3::new(0.0, -0.6, 1.1 * sign))
                * Mat4::from_rotation_x((-45.0_f32 * sign).to_radians())
                * Mat4::from_rotation_z((-31.0_f32).to_radians())
                * Mat4::from_rotation_y((-65.0_f32 * sign).to_radians());
            self.arm(hand, brightness);
        }
        transform *= Mat4::from_rotation_y((-squared * 20.0).to_radians())
            * Mat4::from_rotation_z((-root * 20.0).to_radians())
            * Mat4::from_rotation_x((-root * 80.0).to_radians())
            * Mat4::from_scale(Vec3::splat(0.38))
            * Mat4::from_rotation_y(90_f32.to_radians())
            * Mat4::from_rotation_z(180_f32.to_radians())
            * Mat4::from_translation(Vec3::new(-1.0, -1.0, 0.0))
            * Mat4::from_scale(Vec3::splat(1.0 / 64.0));
        self.map_transform = Some(transform);
        let color = super::gray(brightness);
        let quad = |x0, y0, x1, y1, z| {
            [[x0, y1], [x1, y1], [x1, y0], [x0, y0]]
                .map(|[x, y]| transform.transform_point3(Vec3::new(x, y, z)))
        };
        self.quad(
            quad(-7.0, -7.0, 135.0, 135.0, 0.0),
            [0.0, 1.0, 1.0, -1.0],
            crate::assets::entity_texture("misc/mapbg.png"),
            color,
        );
        self.quad(
            quad(0.0, 0.0, 128.0, 128.0, -0.01),
            [0.0, 1.0, 1.0, -1.0],
            -2,
            color,
        );
        if let Some(map) = map {
            for &[packed, x, z] in &map.icons {
                let icon = packed as u8 & 15;
                let rotation = f32::from((packed as u8) >> 4) * std::f32::consts::TAU / 16.0;
                let icon_transform = transform
                    * Mat4::from_translation(Vec3::new(
                        f32::from(x) / 2.0 + 64.0,
                        f32::from(z) / 2.0 + 64.0,
                        -0.02,
                    ))
                    * Mat4::from_rotation_z(rotation)
                    * Mat4::from_scale(Vec3::new(4.0, 4.0, 3.0))
                    * Mat4::from_translation(Vec3::new(-0.125, 0.125, 0.0));
                let points = [[-1.0, 1.0], [1.0, 1.0], [1.0, -1.0], [-1.0, -1.0]]
                    .map(|[x, y]| icon_transform.transform_point3(Vec3::new(x, y, 0.0)));
                self.quad(
                    points,
                    [
                        f32::from(icon % 4) / 4.0,
                        f32::from(icon / 4) / 4.0,
                        0.25,
                        0.25,
                    ],
                    crate::assets::entity_texture("misc/mapicons.png"),
                    color,
                );
            }
        }
    }
}

impl Geometry {
    pub fn map_label(&mut self, font: &crate::gui::Geometry) {
        let (Some(id), Some(transform)) = (self.map, self.map_transform) else {
            return;
        };
        let start = self.vertices.len() as u32;
        let glyphs = font.layout(&format!("map_{id}"), 0xff000000).0;
        self.glyphs(glyphs, Vec3::new(0.0, 0.0, -0.04), transform);
        self.map_text = start..self.vertices.len() as u32;
    }
}