tawasuyu/llimphi

1//! Demo headless de la mecánica núcleo de juego voxel: **mirar → romper**.
2//!
3//! Renderiza el terreno, tira un [`raycast`] desde la cámara hacia el centro de
4//! la vista hasta el primer voxel sólido, y **cava un cráter** (vacía los voxels
5//! en un radio del impacto). Cada edición sube SÓLO su sub-caja vía
6//! `VoxelRenderer::sync` (no re-sube el mundo). Vuelca PNG antes/después e
7//! imprime los bytes subidos vs el grid completo.
8//!
9//! `cargo run -p llimphi-voxel --example raycast_edit --release -- [dim_xz] [seed]`
10
11use std::fs::File;
12use std::io::BufWriter;
13
14use llimphi_3d::glam::Vec3;
15use llimphi_3d::{Atmosphere, Camera3d, VoxelRenderer};
16use llimphi_hal::{wgpu, Hal};
17use llimphi_raster::peniko::Color;
18use llimphi_raster::{vello, Renderer};
19use llimphi_voxel::{raycast, terrain};
20
21const W: u32 = 880;
22const H: u32 = 560;
23const FMT: wgpu::TextureFormat = wgpu::TextureFormat::Rgba8Unorm;
24
25fn main() {
26    let dim_xz: u32 = std::env::args().nth(1).and_then(|s| s.parse().ok()).unwrap_or(160);
27    let seed: u32 = std::env::args().nth(2).and_then(|s| s.parse().ok()).unwrap_or(7);
28    let dy = (dim_xz * 4 / 10).max(48);
29    let dim = [dim_xz, dy, dim_xz];
30
31    let hal = pollster::block_on(Hal::new(None)).expect("hal");
32    let mut renderer = Renderer::new(&hal).expect("renderer");
33
34    let mut grid = terrain(dim, seed);
35    let mut vr = VoxelRenderer::new(&hal.device, &hal.queue, FMT, &grid);
36    vr.sun_dir = [0.55, 0.6, 0.3];
37    vr.atmosphere = Atmosphere {
38        sky_zenith: [64, 118, 196],
39        sky_horizon: [202, 218, 236],
40        fog_density: 0.5 / dim_xz as f32,
41        god_rays: 0.0,
42    };
43
44    let inter = make_target(&hal);
45    let inter_view = inter.create_view(&wgpu::TextureViewDescriptor::default());
46
47    let camera = Camera3d::orbit(
48        Vec3::new(0.0, dy as f32 * 0.30, 0.0),
49        45_f32.to_radians(),
50        14_f32.to_radians(),
51        dim_xz as f32 * 0.78,
52    );
53
54    // (antes)
55    draw(&hal, &mut renderer, &mut vr, &inter, &inter_view, &camera, "/tmp/edit_before.png");
56
57    // Rayo desde la cámara hacia el centro de la vista. La grilla está centrada
58    // en el origen → origen del rayo en grilla = eye_mundo + dim/2.
59    let dimv = Vec3::new(dim[0] as f32, dim[1] as f32, dim[2] as f32);
60    let ro = camera.eye + dimv * 0.5;
61    let rd = (camera.target - camera.eye).normalize();
62    match raycast(&grid, [ro.x, ro.y, ro.z], [rd.x, rd.y, rd.z], dim_xz as f32 * 3.0) {
63        Some(hit) => {
64            eprintln!("impacto en {:?} (cara {:?}, dist {:.1})", hit.cell, hit.normal, hit.dist);
65            // Cavar un cráter esférico alrededor del impacto.
66            let r = 12i32;
67            let [cx, cy, cz] = hit.cell;
68            for dz in -r..=r {
69                for dyy in -r..=r {
70                    for dx in -r..=r {
71                        if dx * dx + dyy * dyy + dz * dz <= r * r {
72                            let (x, y, z) = (cx + dx, cy + dyy, cz + dz);
73                            if x >= 0 && y >= 0 && z >= 0 {
74                                grid.clear(x as u32, y as u32, z as u32);
75                            }
76                        }
77                    }
78                }
79            }
80            let uploaded = vr.sync(&hal.queue, &mut grid);
81            let full = dim[0] * dim[1] * dim[2] * 4;
82            eprintln!(
83                "cráter r={r} → sync subió {} KiB ({:.3}% del grid completo de {} KiB) — incremental",
84                uploaded / 1024,
85                uploaded as f32 / full as f32 * 100.0,
86                full / 1024,
87            );
88        }
89        None => eprintln!("el rayo no pegó terreno (ajustá cámara)"),
90    }
91
92    // (después)
93    draw(&hal, &mut renderer, &mut vr, &inter, &inter_view, &camera, "/tmp/edit_after.png");
94    eprintln!("escrito /tmp/edit_before.png y /tmp/edit_after.png ({W}x{H})");
95}
96
97fn make_target(hal: &Hal) -> wgpu::Texture {
98    hal.device.create_texture(&wgpu::TextureDescriptor {
99        label: Some("inter"),
100        size: wgpu::Extent3d { width: W, height: H, depth_or_array_layers: 1 },
101        mip_level_count: 1,
102        sample_count: 1,
103        dimension: wgpu::TextureDimension::D2,
104        format: FMT,
105        usage: wgpu::TextureUsages::STORAGE_BINDING
106            | wgpu::TextureUsages::TEXTURE_BINDING
107            | wgpu::TextureUsages::RENDER_ATTACHMENT
108            | wgpu::TextureUsages::COPY_SRC,
109        view_formats: &[],
110    })
111}
112
113#[allow(clippy::too_many_arguments)]
114fn draw(
115    hal: &Hal,
116    renderer: &mut Renderer,
117    vr: &mut VoxelRenderer,
118    target: &wgpu::Texture,
119    target_view: &wgpu::TextureView,
120    camera: &Camera3d,
121    out: &str,
122) {
123    renderer
124        .render_to_view(hal, &vello::Scene::new(), target_view, W, H, Color::from_rgba8(0, 0, 0, 255))
125        .expect("base");
126    let mut enc = hal
127        .device
128        .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: Some("voxel") });
129    vr.render(&hal.device, &hal.queue, &mut enc, target_view, (W, H), camera);
130    hal.queue.submit(std::iter::once(enc.finish()));
131    let _ = hal.device.poll(wgpu::PollType::wait_indefinitely());
132    write_png(hal, target, out);
133}
134
135fn write_png(hal: &Hal, target: &wgpu::Texture, path: &str) {
136    let unpadded = (W * 4) as usize;
137    let align = wgpu::COPY_BYTES_PER_ROW_ALIGNMENT as usize;
138    let padded = unpadded.div_ceil(align) * align;
139    let buf = hal.device.create_buffer(&wgpu::BufferDescriptor {
140        label: Some("readback"),
141        size: (padded * H as usize) as u64,
142        usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST,
143        mapped_at_creation: false,
144    });
145    let mut enc = hal
146        .device
147        .create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
148    enc.copy_texture_to_buffer(
149        wgpu::TexelCopyTextureInfo {
150            texture: target,
151            mip_level: 0,
152            origin: wgpu::Origin3d::ZERO,
153            aspect: wgpu::TextureAspect::All,
154        },
155        wgpu::TexelCopyBufferInfo {
156            buffer: &buf,
157            layout: wgpu::TexelCopyBufferLayout {
158                offset: 0,
159                bytes_per_row: Some(padded as u32),
160                rows_per_image: Some(H),
161            },
162        },
163        wgpu::Extent3d { width: W, height: H, depth_or_array_layers: 1 },
164    );
165    hal.queue.submit(std::iter::once(enc.finish()));
166    let slice = buf.slice(..);
167    let (tx, rx) = std::sync::mpsc::channel();
168    slice.map_async(wgpu::MapMode::Read, move |r| {
169        let _ = tx.send(r);
170    });
171    let _ = hal.device.poll(wgpu::PollType::wait_indefinitely());
172    rx.recv().unwrap().unwrap();
173    let data = slice.get_mapped_range();
174    let mut pixels = Vec::with_capacity((W * H * 4) as usize);
175    for row in 0..H as usize {
176        let s = row * padded;
177        pixels.extend_from_slice(&data[s..s + unpadded]);
178    }
179    drop(data);
180    buf.unmap();
181    let file = File::create(path).expect("png");
182    let mut enc = png::Encoder::new(BufWriter::new(file), W, H);
183    enc.set_color(png::ColorType::Rgba);
184    enc.set_depth(png::BitDepth::Eight);
185    let mut w = enc.write_header().unwrap();
186    w.write_image_data(&pixels).unwrap();
187}